Advertisements
Advertisements
प्रश्न
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
Advertisements
उत्तर
(i) Potential energy
(ii) Heat energy
(iii) Potential energy
APPEARS IN
संबंधित प्रश्न
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
Name five appliances or machines which use an electric motor.
Fill in the boxe to show the corresponding energy transformation.
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
________ is said to be done when a force is acting on it.
