Physics

1A ball is projected at 40 m/s at 30° to the horizontal. Find its maximum height, to 2 decimal places. (g = 10 m/s²)

2A wooden block floats with 60% of its volume in a liquid of density 1,200 kg/m³. The block's density is

3A 2 kg trolley moving at 10 m/s collides with a stationary 1 kg trolley and they move off together. Find their common velocity.

4The impedance of a series RLC circuit is

5When light passes from air into glass it bends

6A 1,000 W motor does work for 1 minute. The energy used is

7A half-wave rectifier uses

8How much heat is needed to vaporise 2 kg of water at 100 °C? (L = 2.26 × 10⁶ J/kg)

9Mixing red, green and blue light gives black.

10An oscillation with a period of 0.2 s has a frequency of ___ Hz.