1 kilo watt =
10 watts
100 watts
500 watts
1000 watts
Which of the following is the correct expression for potential energy of an object?
P E = mgh
P E = 1/2 m v^{2}
P E = 2m g h
P E = mg/h
According to which law, energy can neither be created nor be destroyed but can be converted from one form to another?
Newton's second law
Uncertainty principle
Law of conservation of energy
Newton's 3^{rd} law
Unit of work is
Joule
Watt
m/s
N
An object of mass 15 kg is moving with a uniform velocity of 4m s^{-1} .What is the kinetic energy possessed by the object?
120 J
100 J
220 J
200 J
When the force acts opposite to the direction of displacement
Work done is negative
Work done is positive
Work done is neutral
No work is done
An object of mass 15 kg is moving with a uniform velocity of 4m s^{-1}.What is the kinetic energy possessed by the object?
The kinetic energy possessed by an objects of mass, m and moving with a uniform velocity v is
K.E = 2 m v^{2}
K.E = 1/2 m v^{2}
K.E = 1/4 m v^{2}
K.E = 4m v^{2 }
A girl pulls a trolley and the trolley moves through a distance. What do you think about this situation?
Here work is done
Only force is given
None of these.
A force of 7N acts on an object. The displacement is 8m in the direction of force. What is the work done?
24 J
56 J
54 J
64 J