Advertisements
Advertisements
рдкреНрд░рд╢реНрди
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
Advertisements
рдЙрддреНрддрд░
Mass, m = 1kg
Velocity, v = 10m/s
Kinetic energy = 1/2 ×ЁЭСЪЁЭСОЁЭСаЁЭСа ×(ЁЭСгЁЭСТЁЭСЩЁЭСЬЁЭСРЁЭСЦЁЭСбЁЭСж)2
= 1/2 ×1 ×(10)2= 1/2 ×1 ×100
= 50J
рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНтАНрди
Name a common device where a gear train is used
What is the work done by the moon when it revolves around the earth?
A coolie does no work against the force of gravity while carrying a luggage on a road.
Explain by an example that a body may possess energy even when it is not in motion.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
State larger units of power.
What are the advantages and disadvantages of using solar cells for producing electricity?
