| A | B |
|---|
| What force is necessary to give a 0.80-kg air track glider a horizontal acceleration of 1.5 m/s^2? | 1.2 N |
| A prospector pushes a 2030-kg cart with a constant horizontal force of 700 N for 5 s. If the cart starts from rest, how far will it go during the 5 s that the force is applied? | 4.31 m |
| A body of mass m resting on a frictionless surface is given a horizontal acceleration of 4.5 m/s^2 by a force of 8.7 N. What is the mass of the body? What is the weight of the body? | 1.93 kg; 18.9 N |
| A 4.0-kg object is moving across a frictionless surface with a constant velocity of 2 m/s. What horizontal force is necessary to maintain this state of motion? | 0 N |
| An object is accelerating at 2 m/s^2. If the net force is tripled and the mass is doubled, then what is the new acceleration? | 3 m/s^2 |
| Three vectors are acting on a 3.0-kg object. If the forces are 4 N at 53˚ north of east, 6 N at 45˚ north of west, and 2 N at 60˚ south of west, determine the magnitude and direction of the object's rate of acceleration. | 2.12 m/s^2 @ 63.6 N of W |
| An 80-kg man stands in an elevator. What force does he exert under the following conditions? a) The elevator remains stationary. b) The elevator accelerates upward at 2 m/s^2. c) The elevator rises with a constant velocity of 4 m/s. d) While going up, the elevator decelerates at 1.5 m/s^2. e) The elevator goes down with constant velocity of 7 m/s. | 784 N; 944 N; 784 N; 664 N; 784 N |
| A 4-kg wooden block rests on a table. The coefficient of friction between the block and the table is 0.40. A 5-kg mass is attached to the block by a horizontal string passed over a frictionless pulley of negligible mass. What is the acceleration of the block when the 5-kg mass is released? What is the tension in the string during the acceleration? | 3.70 m/s^2; 30.5 N |
| A 5-kg concrete block rests on a smooth table. A 4-kg weight is attached to the block by a string of negligible mass placed over a light, frictionless pulley. What is the acceleration of the block when the 4-kg mass is released? | 4.36 m/s^2; 21.8 N |
| A 15-kg box is resting on a smooth horizontal surface. If the box is pulled at a 25˚ angle with a force of 80 N, calculate the acceleration of the box and the magnitude of the normal force. | 4.83 m/s^2; 113.2 N |
| Two boxes are connected by a lightweight string and are resting on a smooth table. The boxes have masses of 12 kg and 40 kg. A horizontal force of 60 N is applied on the 40-kg box. Find the acceleration of the system and the tension in the string. | 1.15 m/s^2; 13.8 N |
| A 2-kg mass and a 3-kg mass are attached to a lightweight cord that passes over a frcitionless pulley. Find the acceleration of the system and the tension in the cord. | 1.96 m/s^2; 23.52 N |
| A 10-kg lead brick rests on a wooden table. If a force of 46 N is required to slide the brick across the table at constant speed, find the coefficient of friction between the table and the lead brick. | 0.47 |
| A 5-kg concrete block rests on a table. A 4-kg mass is attached to the block by a string passing over a light, frictionless pulley. If the acceleration of the block is measured to be 1 ms^2, what is the coefficient of friction between the block and table? | 0.62 |
| A force of 40 N accelerates a 5-kg block at 6 m/s^2 along a horizontal surface. Find the frictional force and coefficient of friction. | 10 N; 0.20 |
| A skier descends a 30˚ slope. Assuming the coefficient of friction is 0.10, find the skier's acceleration. | 4.05 m/s^2 |
| A coin placed on the cover of a block just begins to move when the cover makes an angle of 38˚ with the horizontal. What is the coefficient of friction between the cover and the coin? | 0.78 |
| A baseball is accelerated upward at a rate of 2.8 m/s^2. Find the upward force acting on the ball if the weight of the ball is 34.3 N. | 44.1 N |
| An elevator of mass 450 kg is accelerated upward. If the tension in the cable that supports the elevator is 6200 N, determine the maximum acceleration of the elevator. | 3.98 m/s^2 |
| A child of mass 75 kg is climbing upward on a rope. If the rope can support a maximum tension of 900 N, determine the the maximum acceleration with which the child can climb the rope. | 2.2 m/s^2 |
