Differentiate between resonance and forced vibrations.
Forced vibrations means the vibrations which take place under the influence of an external time dependent force, eg. When a vibrating tuning fork is placed on table top it starts vibrating.
Resonance, is a special case of forced vibrations, when the frequency of external vibrating body either becomes equal to or integer multiple of the natural frequency of the body then body vibrates with increased amplitude.
The wavelength of waves produced on the surface of water is 20 cm. If the wave velocity is 24 m/s, calculate:
i) State the purpose of a fuse in an electric circuit. Name the material used for making a fuse wire.
ii) Mention two factors on which the internal resistance of a cell depends.
In winter, the weather forecast for a certain day was ‘severe frost’. A wise farmer watered his fields the night before to prevent frost damage to his crops. Why did he water his fields?
10125 J of heat energy boils off 4.5 g of water at 100oC to steam at 100o C. Find the specific latent heat of steam.
A ball of mass 0.20 kg is thrown vertically upwards with an initial velocity of 20 m/s. Calculate the maximum potential energy it gains as it goes up.