1) A coiled spring has a length of 14 cm when it is supporting a 150-g load. When the load is increased to 450-g, the length of the spring becomes 17 cm. What is the spring constant?

2) A 0.150 kg mass oscillates horizontally on a spring with a period of 0.500 s and an amplitude of 0.250 m. Determine the maximum spring potential energy of the system.

3) An object hangs motionless from a spring. When the object is pulled down, the sum of the elastic potential energy of the spring and the gravitational potential energy of the object does: (explain/show how you know)

1. Increases.
2. Decreases.
3. Stay the same.
4. Depends on different elastic constant and mass of the object.

4) A Which the following is necessary to make an object oscillation (explain/show how you know)

1. a stable equilibrium.
2. little or no friction.
3. a disturbance which leads to a restoring force.
4. All the above

5) At By shaking one end of stretched string, a single pulse is generated.The traveling pulse carries (explain/show how you know)

1. mechanical energy.
2. mass traveling along with wave.
3. potential energy.
4. kinetic energy because the particle is moving.

6) On the earth, a certain simple pendulum has a period of 1.60 s. What is the period on the surface of the moon, where g_moon = 1.62 m/s²?

7) The frequency of a coupled mass-spring oscillator depends on (explain/show how you know)

1. The value of the spring constant alone.
2. The value of the mass alone.
3. Both of A and B.
4. Neither of the above.

8) The total energy of a frictionless mass-spring oscillator (explain /show how you know)

1. Is constant.
2. Depends on the amplitude of the oscillation.
3. Both the above.
4. Is not covered in the course.