61
A body is moving with velocity 4 m/s , possesses 56 Joules of Kinetic Energy. The momentum of body will be equal to
Answer: 28 kgms-1
Questions
63
In Force vs Displacement graph, What does the area under the curve represents :
Answer: Work done
64
According to the law of conservation of energy, which of the statements given below is correct ?
Answer: The total energy before and after the transformation always remains constant
65
When we stretch a rubber band, the Elastic Potential Energy of rubber band
Answer: increases
66
A cyclist is moving at a speed of 5 m/s on leveled road. While going down the slop, his speed increases to 7 m/s. Here the nature of work done by gravitational force in increasing the speed of cyclist is an example of ?
Answer: positive work done
67
As per the statement given in Q.9 above, What change it will take place for the potential energy of the car
Answer: It will remain the same
68
A runner, while moving, is facing a wind from the opposite direction. The work done by the wind on runner will be
Answer: negative
69
The commercial unit of energy consumption in households, industries and commercial establishments is
Answer: KW h (kilowatt hour)
71
In winters, rubbing of hands together for some time, causes a sensation of warmth mainly because of
Answer: heat caused by the force of friction
