| A | B |
|---|
| A load of 45 N attached to a spring that is hanging vertically stretches the spring 14 cm. What is the spring constant? | ??? |
| How much force is required to pull a spring 3.0 cm from its equilibrium position if the spring constant is 2.7 x 10^3 N/m? | ??? |
| When a 65-kg person climbs into a 1000-kg car, the car's springs compress vertically by 2.8 cm. What will be the frequency of vibration when the car hits a bump? Ignore damping. | ??? |
| A fisherman's scale stretches 3.9 cm when a 2.7-kg fish hangs from it. (a) What is the spring constant and (b) what will be the amplitude and frequency of vibration if the fish is pulled down 2.5 cm more and released so that it vibrates up and down? | ??? |
| A small fly of mass 0.15 g is caught in a spider's web. The web vibrates predominantly with a frequency of 4.0 Hz. (a) What is the value of the effective spring constant k for the web? (b) At what frequency would you expect the web to vibrate if an insect of mass 0.50 g were trapped? | ??? |
| A balsa wood block of mass 50 g floats on a lake, bobbing up and down at a frequency of 2.5 Hz. (a) What is the value of the effective spring constant of the water? | ??? |
| An elastic cord vibrates with a frequency of 3.0 Hz when a mass of 0.60 kg is hung from it. What will its frequency be if only 0.38 kg hangs from it? | ??? |
