Advertisements
Advertisements
प्रश्न
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
उत्तर
The stone possesses kinetic energy because on releasing the rubber string of the catapult, potential energy of the rubber string is transformed into the kinetic energy of the stone thrown.
APPEARS IN
संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
Is energy a vector quantity?
What kind of energy is possessed by the following?
A compressed spring ____________.
Water stored in a dam possesses :
Name the device or machine which convert :
Heat energy into kinetic energy (or mechanical energy).
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
A microphone converts :