1-4: A 4kg mass oscillates on a spring as shown, performing simple harmonic motion (SHM).

The amplitude of oscillation is 10cm, and the angular velocity is 5 rad s^-1 .

1. The potential energy due to SHM at the centre of oscillation is ...

• A. 0 J
• B. 0.5 J
• C. 1 J
• D. 5 KJ

2. The total energy of the system is ...

• A. 5 J
• B. 0.5 J
• C. 1 J
• D. 5 KJ

3. The maximum velocity is ...

• A. 0.5 ms^-1
• B. 5 ms^-1
• C. 50 ms^-1
• D. 500 ms^-1

4. The time period of the spring shown above is measured to be T.

If the spring is replaced with one where the spring constant k is 4 times larger, and the mass is reduced to 1kg, the new time period will be ...

• A. 4T
• B. 2T
• C. T/2
• D. T/4

5. A pendulum in a clock performs SHM as it oscillates with amplitude 0.2m. The time taken for an oscillation is exactly 2s.

The value of ω (angular velocity) and f (frequency) are therefore:

6. A police car is moving towards an observer with its siren switched on. Compared to the source, the sound as measured by the observer will have ...

• A. a higher frequency and higher velocity
• B. a lower frequency and a higher velocity
• C. a higher frequency and the same velocity
• D. a lower frequency and the same velocity

Radio waves of original frequency 10⁶ Hz will be observed to have a frequency of ...

• A. 1.1 x 10⁶ Hz
• B. 1.01 x 10⁶ Hz
• C. 9.9 x 10⁵ Hz
• D. 9.99 x 10⁵ Hz

8. The Doppler effect can be used to find the velocity of a source. Whcih of the following statements gives the application AND correctly states the wave that can be used ?

I   Speed cameras on roads, using radio waves
II   Blood flow rates, using ultrasound
III   Speed of galaxy recession, using visible light

• A. I only
• B. I and II only
• C. II and III only
• D. All 3 statements