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?
In severe winter, a wise farmer waters his field because when temperature of every 1 g of water falls by 1o, 4.2 J of heat energy is given out. Further, if water freezes, much more heat energy is given out, which keeps the surrounding warm.
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.