| DwyerNotes |
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| Mount Sinai High School |
Physics Teacher/Head Coach Cross Country, Winter and Spring Track |
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Assignment: CL37-W, P, PE, KE pendulum 40Q 10 pts due 7am Fri 02-27-15
1.
A basketball player who weighs 600 newtons jumps 0.5 meter off the floor. What is her kinetic energy just before hitting the floor?
30 J
60 J
300 J
600 J
2.
Base your answer to this question on the information below.
A boy pushes his wagon at constant speed along a level sidewalk. The graph below represents the relationship between the horizontal force exerted by the boy and the distance the wagon moves.
What is the total work done by the boy in pushing the wagon 4.0 meters?
5.0 J
7.5 J
120 J
180 J
3.
When a 5-kilogram mass is lifted from the ground to a height of 10 meters, the gravitational potential energy of the mass is increased by approximately
0.5 J
2 J
50 J
500 J
4.
The diagram below shows a moving, 5.00-kilogram cart at the foot of a hill 10.0 meters high. For the cart to reach the top of the hill, what is the minimum kinetic energy of the cart in the position shown? [Neglect energy loss due to friction.]
4.91 J
50.0 J
250. J
491 J
5.
How much work is done on a downhill skier by an average braking force of 9.8 × 102 newtons to stop her in a distance of 10. meters?
1.0 × 101 J
9.8 × 101 J
1.0 × 103 J
9.8 × 103 J
6.
The work done on a slingshot is 40.0 joules to pull back a 0.10-kilogram stone. If the slingshot projects the stone straight up in the air, what is the maximum height to which the stone will rise? [Neglect friction.]
0.41 m
41 m
410 m
4.1 m
7.
In the diagram below, an average force of 20. newtons is used to pull back the string of a bow 0.60 meter.
As the arrow leaves the bow, its kinetic energy is
3.4 J
6.0 J
12 J
33 J
8.
Base your answer to the question on the graph below, which represents the relationship between vertical height and gravitational potential energy for an object near Earth’s surface.
What physical quantity does the slope of the graph represent?
the weight of the object
the mass of the object
the change in potential energy of the object
the change in height of the object
9.
An object with a speed of 20. meters per second has a kinetic energy of 400. joules. The mass of the object is
1.0 kg
2.0 kg
0.50 kg
40. kg
10.
Which graph best represents the relationship between the gravitational potential energy of an object near the surface of Earth and its height above Earth’s surface?
11.
A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]
0.71 m
1.4 m
2.5 m
3.5 m
12.
A 55.0-kilogram diver falls freely from a diving platform that is 3.00 meters above the surface of the water in a pool. When she is 1.00 meter above the water, what are her gravitational potential energy and kinetic energy with respect to the water’s surface?
PE = 1620 J and KE = 0 J
PE = 1080 J and KE = 540 J
PE = 810 J and KE = 810 J
PE = 540 J and KE = 1080 J
13.
The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object’s:
acceleration
momentum
position
speed
14.
As a box is pushed 30. meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the box increases by 300. Joules. How much total internal energy is produced during this process?
150 J
250 J
450 J
750 J
15.
Base your answer to the question on the information below.
A 75-kilogram athlete jogs 1.8 kilometers along a straight road in 1.2 × 103 seconds.
Determine the average speed of the athlete in meters per second.
Answer: m/s
Calculate the average kinetic energy of the athlete.
Answer: KE = J
16.
A 45.0-kilogram boy is riding a 15.0-kilogram bicycle with a speed of 8.00 meters per second. What is the combined kinetic energy of the boy and the bicycle?
240. J
480. J
1440 J
1920 J
17.
Base your answer to the question on the information below.
A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires 3.13 × 105 joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds.
Calculate the height of the hill. [Neglect friction.]
Answer: m
18.
A box is pushed to the right with a varying horizontal force. The graph below represents the relationship between the applied force and the distance the box moves.
What is the total work done in moving the box 6.0 meters?
9.0 J
18 J
27 J
36 J
19.
A student pulls a block 3.0 meters along a horizontal surface at constant velocity. The diagram shows the components of the force exerted on the block by the student.
How much work is done against friction?
18 J
24 J
30. J
42 J
20.
The work done in moving a block across a rough surface and the heat energy gained by the block can both be measured in
watts
degrees
newtons
joules
21.
A motor having a maximum power rating of 8.1 × 104 watts is used to operate an elevator with a weight of 1.8 × 104 newtons. What is the maximum weight this motor can lift at an average speed of 3.0 meters per second?
6.0 × 103 N
1.8 × 104 N
2.4 × 104 N
2.7 × 104 N
22.
A cart of mass M on a frictionless track starts from rest at the top of a hill having height h1, as shown in the diagram below.
What is the kinetic energy of the cart when it reaches the top of the next hill, having height h2?
Mgh1
Mg(h1 − h2)
Mg(h2 − h3)
0
23.
The graph shows the force exerted on a block as a function of the block's displacement in the direction of the force.
How much work did the force do in displacing the block 5.0 meters?
0 J
20. J
0.80 J
4.0 J
24.
Calculate the kinetic energy of a particle with a mass of 3.34 × 10–27 kilogram and a speed of 2.89 × 105 meters per second.
Answer: × 10-16 J
25.
What is the power output of an electric motor that lifts a 2.0-kilogram block 15 meters vertically in 6.0 seconds?
5.0 J
5.0 W
49 J
49 W
26.
What is the average power developed by a motor as it lifts a 400.-kilogram mass at constant speed through a vertical distance of 10.0 meters in 8.0 seconds?
320 W
500 W
4,900 W
32,000 W
27.
The graph below represents the kinetic energy, gravitational potential energy, and total mechanical energy of a moving block.
Which best describes the motion of the block?
accelerating on a flat horizontal surface
sliding up a frictionless incline
falling freely
being lifted at constant velocity
28.
Which graph best represents the relationship between the gravitational potential energy of a freely falling object and the object’s height above the ground near the surface of Earth?
29.
The diagram represents a block sliding along a frictionless surface between points A and G.
As the block moves from point A to point B, the speed of the block will be
decreasing
increasing
constant, but not zero
zero
30.
The diagram below represents a 155-newton box on a ramp. Applied force F causes the box to slide from point A to point B.
What is the total amount of gravitational potential energy gained by the box?
28.4 J
279 J
868 J
2740 J
31.
A car with mass m possesses momentum of magnitude p. Which expression correctly represents the kinetic energy, KE, of the car in terms of m and p?
32.
A child does 0.20 joule of work to compress the spring in a pop-up toy. If the mass of the toy is 0.010 kilogram, what is the maximum vertical height that the toy can reach after the spring is released?
20. m
2.0 m
0.20 m
0.020 m
33.
A student does 60. joules of work pushing a 3.0-kilogram box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work?
20. N
15 N
12 N
4.0 N
34.
Base your answer to the question on the information and diagram below.
A 3.0-kilogram object is placed on a frictionless track at point A and released from rest. (Assume the gravitational potential energy of the system to be zero at point C.)
Calculate the gravitational potential energy of the object at point A.
Answer: ΔPE = J
35.
Base your answer to the question on the information below.
A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires 3.13 × 105 joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds.
Calculate the magnitude of the average acceleration of the roller coaster car as it descends to the bottom of the hill.
Answer: m/s2
36.
A 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. What is the kinetic energy of the bicyclist?
4.5 × 102 J
9.0 × 102 J
5.4 × 103 J
1.1 × 104 J
37.
A 0.50-kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules. Approximately how high will the ball rise? [Neglect air resistance.]
2.6 m
5.1 m
13 m
25 m
38.
Base your answer to the question on the information and diagram below.
A 3.0-kilogram object is placed on a frictionless track at point A and released from rest. (Assume the gravitational potential energy of the system to be zero at point C.)
Which letter represents the farthest point on the track that the object will reach?
Answer:
39.
A pendulum is made from a 7.50-kilogram mass attached to a rope connected to the ceiling of a gymnasium. The mass is pushed to the side until it is at position A, 1.5 meters higher than its equilibrium position. After it is released from rest at position A, the pendulum moves freely back and forth between positions A and B, as shown in the diagram below.
What is the total amount of kinetic energy that the mass has as it swings freely through its equilibrium position? [Neglect friction.]
11 J
94 J
110 J
920 J
40.
A student rides a bicycle up a 30.° hill at a constant speed of 6.00 meters per second. The combined mass of the student and the bicycle is 70.0 kilograms. What is the kinetic energy of the student-bicycle system during this ride?
210. J
420. J
1260 J
2520 J
Assignment: CL36-Energy 40Q 10 pts due 11:59pm Tue 02-24-15
1.
An object weighing 15 newtons is lifted from the ground to a height of 0.22 meter. The increase in the object’s gravitational potential energy is approximately
310 J
32 J
3.3 J
0.34 J
2.
An object moving at a constant speed of 25 meters per second possesses 450 joules of kinetic energy. What is the object’s mass?
0.72 kg
1.4 kg
18 kg
36 kg
3.
Base your answer to the question on the information and diagram below.
A 3.0-kilogram object is placed on a frictionless track at point A and released from rest. (Assume the gravitational potential energy of the system to be zero at point C.)
Which letter represents the farthest point on the track that the object will reach?
Answer:
4.
Base your answer to the question on the information and diagram below.
A 3.0-kilogram object is placed on a frictionless track at point A and released from rest. (Assume the gravitational potential energy of the system to be zero at point C.)
Calculate the gravitational potential energy of the object at point A.
Answer: ΔPE = J
5.
Which graph best represents the relationship between the gravitational potential energy of an object near the surface of Earth and its height above Earth’s surface?
6.
Base your answer to the question on the information below.
A 75-kilogram athlete jogs 1.8 kilometers along a straight road in 1.2 × 103 seconds.
Determine the average speed of the athlete in meters per second.
Answer: m/s
Calculate the average kinetic energy of the athlete.
Answer: KE = J
7.
As a ball falls freely (without friction) toward the ground, its total mechanical energy
decreases
increases
remains the same
8.
Base your answer to the question on the information and diagram.
A 250.-kilogram car is initially at rest at point A on a roller coaster track. The car carries a 75-kilogram passenger and is 20. meters above the ground at point A. [Neglect friction.]
Compare the total mechanical energy of the car and passenger at points A, B, and C.
The total mechanical energy is less at point C than it is at points A or B.
The total mechanical energy is greatest at point A.
The total mechanical energy is the same at all three points.
The total mechanical energy is greatest at point B.
9.
A basketball player who weighs 600 newtons jumps 0.5 meter off the floor. What is her kinetic energy just before hitting the floor?
30 J
60 J
300 J
600 J
10.
A 45.0-kilogram boy is riding a 15.0-kilogram bicycle with a speed of 8.00 meters per second. What is the combined kinetic energy of the boy and the bicycle?
240. J
480. J
1440 J
1920 J
11.
The diagram represents a 0.20-kilogram sphere moving to the right along a section of a frictionless surface. The speed of the sphere at point A is 3.0 meters per second.
Approximately how much kinetic energy does the sphere gain as it goes from point A to point B?
1.0 J
2.0 J
3.9 J
0.98 J
12.
As the speed of a bicycle moving along a horizontal surface increases from 2 meters per second to 4 meters per second, the magnitude of the bicycle's gravitational potential energy
decreases
increases
remains the same
13.
When a 5-kilogram mass is lifted from the ground to a height of 10 meters, the gravitational potential energy of the mass is increased by approximately
0.5 J
2 J
50 J
500 J
14.
The graph below represents the kinetic energy, gravitational potential energy, and total mechanical energy of a moving block.
Which best describes the motion of the block?
accelerating on a flat horizontal surface
sliding up a frictionless incline
falling freely
being lifted at constant velocity
15.
Base your answer to the question on the graph below, which represents the relationship between vertical height and gravitational potential energy for an object near Earth’s surface.
Based on the graph, what is the gravitational potential energy of the object when it is 2.25 meters above the surface of Earth?
Answer: J
16.
The diagram below represents a 155-newton box on a ramp. Applied force F causes the box to slide from point A to point B.
What is the total amount of gravitational potential energy gained by the box?
28.4 J
279 J
868 J
2740 J
17.
The diagram represents a block sliding along a frictionless surface between points A and G.
As the block moves from point A to point B, the speed of the block will be
decreasing
increasing
constant, but not zero
zero
18.
A 20.-kilogram object strikes the ground with 1960 joules of kinetic energy after falling freely from rest. How far above the ground was the object when it was released?
10. m
14 m
98 m
200 m
19.
A 75-kilogram bicyclist coasts down a hill at a constant speed of 12 meters per second. What is the kinetic energy of the bicyclist?
4.5 × 102 J
9.0 × 102 J
5.4 × 103 J
1.1 × 104 J
20.
As a ball falls freely toward the ground, its total mechanical energy:
decreases
increases
remains the same
21.
A 60.0-kilogram runner has 1920 joules of kinetic energy. At what speed is she running?
5.66 m/s
8.00 m/s
32.0 m/s
64.0 m/s
22.
A girl rides an escalator that moves her upward at a constant speed. As the girl rises, how do her gravitational energy and kinetic energy change?
Gravitational potential energy decreases and kinetic energy decreases.
Gravitational potential energy decreases and kinetic energy remains the same.
Gravitational potential energy increases and kinetic energy decreases.
Gravitational potential energy increases and kinetic energy remains the same.
23.
A car, initially traveling at 30. meters per second, slows uniformly as it skids to a stop after the brakes are applied. Which graph correctly shows the relationship between the kinetic energy of the car as it is being brought to a stop and the work done by friction in stopping the car?
image
image
image
image
24.
A book sliding across a horizontal tabletop slows until it comes to rest. Describe what change, if any, occurs in the book’s kinetic energy and internal energy as it slows.
The kinetic energy increases and the internal energy decreases.
The kinetic energy decreases and the internal energy increases.
The kinetic energy decreases and the internal energy decreases.
The kinetic energy increases and the internal energy increases.
25.
Base your answer to the question on the information below.
A roller coaster car has a mass of 290. kilograms. Starting from rest, the car acquires 3.13 × 105 joules of kinetic energy as it descends to the bottom of a hill in 5.3 seconds.
Calculate the speed of the roller coaster car at the bottom of the hill.
Answer: m/s
26.
An object with a speed of 20. meters per second has a kinetic energy of 400. joules. The mass of the object is
1.0 kg
2.0 kg
0.50 kg
40. kg
27.
If the speed of an object is doubled, its kinetic energy will be
halved
doubled
quartered
quadrupled
28.
Base your answer to the question on the information and diagram below.
A 3.0-kilogram object is placed on a frictionless track at point A and released from rest. (Assume the gravitational potential energy of the system to be zero at point C.)
Calculate the kinetic energy of the object at point B.
Answer: KE = J
29.
A box weighing 1.0 × 102 newtons is dragged to the top of an incline, as shown in the diagram.
The gravitational potential energy of the box at the top of the incline is approximately
1.0 × 102 J
6.0 × 102 J
8.0 × 102 J
1.0 × 103 J
30.
Base your answer to the question on the information and diagram.
A 250.-kilogram car is initially at rest at point A on a roller coaster track. The car carries a 75-kilogram passenger and is 20. meters above the ground at point A. [Neglect friction.]
Calculate the total gravitational potential energy, relative to the ground, of the car and the passenger at point A.
Answer: ΔPE = × 104 J
31.
A constant force is used to keep a block sliding at constant velocity along a rough horizontal track. As the block slides, there could be an increase in its
gravitational potential energy, only
internal energy, only
gravitational potential energy and kinetic energy
internal energy and kinetic energy
32.
A 0.10-kilogram ball dropped vertically from a height of 1.0 meter above the floor bounces back to a height of 0.80 meter. The mechanical energy lost by the ball as it bounces is approximately
0.080 J
0.20 J
0.30 J
0.78 J
33.
Base your answer to this question on the information below.
A 65-kilogram pole vaulter wishes to vault to a height of 5.5 meters.
Calculate the speed the vaulter must attain to have the necessary kinetic energy.
Answer: m/s
34.
A 1.0-kilogram rubber ball traveling east at 4.0 meters per second hits a wall and bounces back toward the west at 2.0 meters per second. Compared to the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall is
one-fourth as great
one-half as great
the same
four times as great
35.
A car travels at constant speed v up a hill from point A to point B, as shown in the diagram below.
As the car travels from A to B, its gravitational potential energy
increases and its kinetic energy decreases
increases and its kinetic energy remains the same
remains the same and its kinetic energy decreases
remains the same and its kinetic energy remains the same
36.
Base your answer to the question on the graph below, which represents the relationship between vertical height and gravitational potential energy for an object near Earth’s surface.
What physical quantity does the slope of the graph represent?
the weight of the object
the mass of the object
the change in potential energy of the object
the change in height of the object
37.
A block weighing 40. newtons is released from rest on an incline 8.0 meters above the horizontal, as shown in the diagram below.
image
If 50. joules of heat is generated as the block slides down the incline, the maximum kinetic energy of the block at the bottom of the incline is
50. J
270 J
320 J
3100 J
38.
Which statement describes the kinetic energy and total mechanical energy of a block as it is pulled at constant speed up an incline?
Kinetic energy decreases and total mechanical energy increases.
Kinetic energy decreases and total mechanical energy remains the same.
Kinetic energy remains the same and total mechanical energy increases.
Kinetic energy remains the same and total mechanical energy remains the same.
39.
Which situation describes a system with decreasing gravitational potential energy?
a girl stretching a horizontal spring
a bicyclist riding up a steep hill
a rocket rising vertically from Earth
a boy jumping down from a tree limb
40.
The gravitational potential energy, with respect to Earth, that is possessed by an object is dependent on the object’s:
acceleration
momentum
position
speed
QUIZ Review Motion Equations, g
Always use correct significant digits with the appropriate units. Show all work and place your final answer in the space provided. Always write in complete sentences! Use additional paper as needed from my front desk! In order to be eligible for full credit, the student must list all givens and unknowns, appropriate equation, substitutions with units, final answer with units and correct significant digits.
v=__________ d=__________ a= __________ 1. A car accelerates from +2.65m/s to +18.19m/s in 12.95s. Calculate the car’s average velocity, displacement and acceleration.
t=__________ vi=__________ vf=__________
Equation____________________ Substitution_______________
Equation____________________ Substitution_______________
Equation____________________ Substitution_______________
_______________2. If a car with a velocity of +21.25 m/s accelerates at a rate of +41.43 m/s2 for 43.10 s, what is its final velocity? Givens:___________________________________________
Equation____________________ Substitution_______________
_______________3. A car starting from 1.2 m/s accelerates at +7.6 m/s2 for 4.2 s. How far does the car move? Givens:___________________________________________
Equation____________________ Substitution_______________
_______________4. An airplane must reach a speed of 79.5 m/s for takeoff. If the runway is 1.45 km long, what must the acceleration be? Givens:__________________________________
Equation____________________ Substitution_______________
5. Amy drops a ball. It hits the ground 0.875 seconds later.
t=__________ vi=__________ a=__________
What is its velocity as it strikes the ground?_____________
Equation____________________ Substitution_______________
How far did it fall?
Equation____________________ Substitution_______________
6. Ashley throws a ball straight up with an initial velocity of 6.85m/s.
What is its initial velocity? __________
What is its final velocity? __________
What is its acceleration? __________
How high will it go? __________
Equation____________________ Substitution_______________
How long does it take to go up? __________
Equation____________________ Substitution_______________
How long will it be in the air? __________
Assignment: CL09- Energy Levels, MP, Motion 10pts due by 7am Fri 10-12-14
1.
Which event would produce electromagnetic radiation?
an accelerating neutron
an accelerating electron
a neutron moving with constant velocity
an electron moving with constant velocity
2.
The four-line Balmer series spectrum shown in the diagram below is emitted by a hydrogen gas sample in a laboratory.
A star moving away from Earth also emits a hydrogen spectrum. Which spectrum might be observed on Earth for this star?
3.
A hydrogen atom with an electron initially in the n = 2 level is excited further until the electron is in the n = 4 level. This energy level change occurs because the atom has
absorbed a 0.85-eV photon
emitted a 0.85-eV photon
absorbed a 2.55-eV photon
emitted a 2.55-eV photon
4.
A tritium nucleus is formed by combining two neutrons and a proton. The mass of this nucleus is 9.106 ×10−3 universal mass unit less than the combined mass of the particles from which it is formed. Approximately how much energy is released when this nucleus is formed?
8.48 ×10−2 MeV
2.73 MeV
8.48 MeV
273 MeV
5.
Base your answer to this question on the information below.
As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e.
Express the energy of the absorbed photon in joules.
Answer: × 10−19 J
6.
What type of nuclear force holds the protons and neutrons in an atom together?
a strong force that acts over a short range
a strong force that acts over a long range
a weak force that acts over a short range
a weak force that acts over a long range
7.
What is the minimum energy needed to ionize a hydrogen atom in the n = 2 energy state?
13.6 eV
10.2 eV
3.40 eV
1.89 eV
8.
If a deuterium nucleus has a mass of 1.53 × 10-3 universal mass units less than its components, this mass represents an energy of
1.38 MeV
1.42 MeV
1.53 MeV
3.16 MeV
9.
On the atomic level, energy and matter exhibit the characteristics of
particles, only
waves, only
neither particles nor waves
both particles and waves
10.
Which type of force overcomes the repulsive electrostatic force between protons in the nucleus of an atom?
magnetic
nuclear
gravitational
centrifugal
11.
What is the mass number of an atom with 9 protons, 11 neutrons, and 9 electrons?
9
18
20
29
12.
In an experiment, Ernest Rutherford discovered that some of the alpha particles directed at a thin gold foil were scattered at large angles. This scattering occurred because the
negatively charged alpha particles were attracted to the gold's positive atomic nuclei
negatively charged alpha particles were repelled be the gold's negative atomic nuclei
positively charged alpha particles were attracted to the gold's negative atomic nuclei
positively charged alpha particles were repelled by the gold's positive atomic nuclei
13.
When an electron changes from a higher energy level to a lower energy level within an atom, a quantum of energy is
fissioned
fused
emitted
absorbed
14.
Which particles are not affected by the strong force?
hadrons
protons
neutrons
electrons
15.
What is the minimum amount of energy needed to ionize a mercury electron in the c energy level?
0.57 eV
4.86 eV
5.52 eV
10.38 eV
16.
The energy emitted by the Sun originates from the process of
fission
fusion
alpha decay
beta decay
17.
According to the Rutherford model of the atom, an atomic nucleus contains
all of the atom's electric charge, but none of the atom's mass
all of the atom's mass, but none of the atom's electric charge
most of the atom's mass and all of the atom's negative charge
most of the atom's mass and all of the atom's positive charge
18.
Base your answer to the question on the information in the chart below and on your knowledge of physics.
A tritium nucleus consists of one proton and two neutrons and has a total mass of 3.0170 atomic mass units. What is the mass defect of the tritium nucleus?
0.0014 u
0.0077 u
1.0010 u
2.0160 u
19.
An electron in a mercury atom drops from energy level f to energy level c by emitting a photon having an energy of
8.20 eV
5.52 eV
2.84 eV
2.68 eV
20.
Which pair of graphs represents the same motion?
21.
One isotope of uranium is . Any other isotope of uranium must have
92 protons
146 protons
92 neutrons
146 neutrons
22.
The graph represents the relationship between the displacement of an object and its time travel along a straight line.
What is the magnitude of the object's total displacement after 8.0 seconds?
0 m
2 m
8 m
16 m
23.
A child riding a bicycle at 15 meters per second accelerates at −3.0 meters per second2 for 4.0 seconds. What is the child’s speed at the end of this 4.0-second interval?
12 m/s
27 m/s
3.0 m/s
7.0 m/s
24.
The graph below represents the relationship between mass and its energy equivalent.
The slope of the graph represents
the electrostatic constant
gravitational field strength
the speed of light squared
Planck's constant
25.
The graph represents the relationship between the displacement of an object and its time travel along a straight line.
What is the average speed of the object during the first 4.0 seconds?
0 m/s
2 m/s
8 m/s
4 m/s
26.
White light is passed through a cloud of cool hydrogen gas and then examined with a spectroscope. The dark lines observed on a bright background are caused by
the hydrogen emitting all frequencies in white light
the hydrogen absorbing certain frequencies of the white light
diffraction of the white light
constructive interference
27.
One car travels 40. meters due east in 5.0 seconds, and a second car travels 64 meters due west in 8.0 seconds. During their periods of travel, the cars definitely had the same
average velocity
total displacement
change in momentum
average speed
28.
A hydrogen atom in the ground state receives 10.2 electron volts of energy. To which energy level may the atom become excited?
n = 5
n = 2
n = 3
n = 4
29.
A rocket initially at rest on the ground lifts off vertically with a constant acceleration of 2.0 × 101 meters per second2. How long will it take the rocket to reach an altitude of 9.0 × 103 meters?
3.0 × 101 s
4.3 × 101 s
4.5 × 102 s
9.0 × 102 s
30.
A high-speed train in Japan travels a distance of 300. kilometers in 3.60 × 103 seconds. What is the average speed of this train?
1.20 × 10–2 m/s
8.33 × 10–2 m/s
12.0 m/s
83.3 m/s
31.
An object that is originally moving at a speed of 20. meters per second accelerates uniformly for 5.0 seconds to a final speed of 50. meters per second. What is the acceleration of the object?
14 m/s2
10. m/s2
6.0 m/s2
4.0 m/s2
32.
The graph below represents the relationship between speed and time for an object moving along a straight line.
What is the total distance traveled by the object during the first 4 seconds?
5 m
20 m
40 m
80 m
33.
Which pair of terms are vector quantities?
force and mass
distance and displacement
momentum and acceleration
speed and velocity
34.
The graph below shows the relationship between the speed and elapsed time for an object falling freely from rest near the surface of a planet.
What is the total distance the object falls during the first 3.0 seconds?
12 m
24 m
44 m
72 m
35.
Base your answer to the question on the information below.
A car on a straight road starts from rest and accelerates at 1.0 meter per second2 for 10. seconds. Then the car continues to travel at constant speed for an additional 20. seconds.
Calculate the distance the car travels in the first 10. seconds.
Answer: d = m
36.
The displacement-time graph elow shows the motion of a cart along a straight line.
During which interval was the cart accelerating?
AB
BC
CD
DE
37.
Which two graphs best represent the motion of an object falling freely from rest near the Earth's surface?
38.
Which particle would generate the greatest amount of energy if its entire mass were converted into energy?
electron
proton
alpha particle
neutron
39.
The velocity of a car changes from 60. meters per second north to 45 meters per second north in 5.0 seconds. The magnitude of the car's acceleration is
9.8 m/s2
15 m/s2
3.0 m/s2
53 m/s2
40.
The height of a doorknob above the floor is approximately
1 × 102 m
1 × 101 m
1 × 100 m
1 × 10−2 m
3 Point Problem Solving Procedure
1. List all givens and unknowns
2. Select the Proper Equation. Substitute into the equation.
Be sure to include the Number with its Units.
3. Place your Final Answer in the Answer Space.
Be sure to include the units with the correct significant digits.
Is your answer reasonable?
GUESS-What does each letter stand for?
At this point, what should you know about significant digits?
v=__________ d=__________ a= __________ A car accelerates from +2.6m/s to +8.9m/s in 3.7s. Calculate the car’s average velocity, displacement and acceleration. List givens and unknowns________________________________
Equation
Equation
Equation
A car travels a distance of 908 meters in 103.4 seconds. What is the average speed of the car during this time interval?
List givens and unknowns________________________________________
Equation
An object initially traveling in a straight line with a speed of 5.25 meters per second is accelerated at 2.08 meters per second squared for 4.30 seconds. Determine the total distance traveled by the object.
List givens and unknowns________________________________________
Equation
A boat initially traveling at 10.7 meters per second accelerates uniformly at the rate of 5.48 meters per second squared for 10.92 seconds. How far does the boat travel during this time?
List givens and unknowns________________________________________
Equation
A race car traveling at 15.8 meters per second accelerates at a rate of 1.54 meters per second2 while traveling a distance of 648 meters. Determine the final speed of the race car.
List givens and unknowns________________________________________
Equation
A motorboat heads due east at 16.8 m/s across a river that flows due north at 7.4 m/s. The river is 156 meters wide.
____________________What is the resultant velocity of the boat?
You will need both the length and the angle in the answer space!!!!
____________________How long does it take the boat to cross the river?
_____________How far downstream is the boat when it reaches the other side of the river? Show All Work Below!
Harold walks at a constant velocity of 3.8 m/s north for 5.0 s. Complete the table of time, displacement, velocity and acceleration for each second. Then sketch d-t, v-t and a-t graphs for each situation. Constant or Uniform Velocity!
Time (s) Displacement (m) Velocity (m/s) Acceleration(m/s2)
0.0
1.0
2.0
3.0
4.0
5.0
Harold now starts from rest and accelerates at 1.60 m/s2 north for 5.0 s. Complete the table of time, displacement, velocity and acceleration for each second. Then sketch d-t, v-t and a-t graphs for each situation.
Constant or Uniform Acceleration!
Time (s) Displacement (m) Velocity (m/s) Acceleration(m/s2)
0.0
1.0
2.0
3.0
4.0
5.0
John walks 45.8 m due east and then walks 88.9 m due north. Calculate John’s distance and his displacement mathematically (Pythagorean Theorem, SOHCAHTOA) and graphically (draw to scale using your ruler and protractor)? Remember to draw all ARROWS on all vectors!
Mathematically distance = ____________ displacement = ____________
Graphically scale 1.0cm = _____ m displacement = ____________
Hint: Sketch the situation FIRST!
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| Last updated 2019/10/02 17:44:02 EDT | Hits 7092 |
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