An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.
[specific heat capacity of water = 4200 jkg-1 K-1]
A heating coil rated 1000 W is used to boil off completely 2 kg of boiling water. The time required to boil the water is?
[Special latent heat of Vaporization of water = 2.3 x 10\(^6\) Jkg-1]
A device that converts sound energy into electrical energy is?
A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?
A force F is applied to a body P as shown in the diagram above. If the body moves through a distance, a, which of the following represents the work done?
