On a clear day at noon the solar energy reaching the earth is ____________________?
A. 1.44kw/m2
B. 1.4kw/m2
C. 1 kw/m2
D. none
The source of tidal energy is____________________?
The source of tidal energy is____________________?
A. sun
B. earth
C. both A and B
D. moon
The dot product of force and velocity is__________________?
The dot product of force and velocity is__________________?
A. power
B. work
C. impulse
D. torque
The dimension of power is_______________?
The dimension of power is_______________?
A. [ML2T-3]
B. [ML2T-2]
C. [ML2T3]
D. none of these
The work done by friction is__________________?
The work done by friction is__________________?
A. positive
B. negative
C. zero
D. none of these
When arrow is released form its bow, its energy is transformed from _____________________?
When arrow is released form its bow, its energy is transformed from _____________________?
A. heat energy to K.E
B. elastic P.E to K.E
C. elemical energy to elastic P.E
D. K.E to elastic P.E.
If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________?
If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________?
A. 1600 ms-1
B. 50.6 ms-1
C. 71.6 ms-1
D. 2263ms-1
The escape velocity form the earth surface in km S-1 is____________________?
The escape velocity form the earth surface in km S-1 is____________________?
A. 4.2 km S-1
B. 7.5 km S-1
C. 9.5 km S-1
D. 1.1 km S-1
The consumption of energy by a 60 watt bulb in 2 sec is_________________?
The consumption of energy by a 60 watt bulb in 2 sec is_________________?
A. 120 J
B. 60 J
C. 30 J
D. 0.02 J
Which of the following is not conservative force_________________?
Which of the following is not conservative force_________________?
A. friction
B. electric
C. gravitational
D. magnetic