The energy used in households, industries and commercial establishments are usually expressed in
Joules
W
KWh
None of these.
A compressed spring possesses
Kinetic energy
Elastic potential energy
Electrical energy
Magnetic energy
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
Which of the following is the correct expression for potential energy of an object?
P E = mgh
P E = 1/2 m v2
P E = 2m g h
P E = mg/h
Which of the following is the the ability to do work?
Energy
Velocity
Momentum
Force
1 watt =
10 J S-1
1 J S-1
0.1 J S-1
100 J S-1
The capacity to do work is
Power
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
Which of the following is due to position or state of strain?
Potential energy
Mechanical energy
The kinetic energy possessed by an objects of mass, m and moving with a uniform velocity v is
K.E = 2 m v2
K.E = 1/2 m v2
K.E = 1/4 m v2
K.E = 4m v2
