Physics
A coolie A takes 1 minute to lift a load to the roof of a bus whereas coolie B take 2 minutes to lift the same load to the roof of the same bus. The work done by B is:
- equal to work done by A
- greater than work done by A
- less than work done by A
- none of the above.
Related Questions
When a ball m is thrown upwards to a height h, the work done by the force of gravity is:
- mgh
- -mgh
- mg
- mgh2
Identify the incorrect statement :
No work is done by a force F on an object if :
- the object is stationary but the point of application of force moves on the object.
- the object moves in such a way that the point of application of force remains fixed.
- the force is always perpendicular to velocity.
- the force is always perpendicular to acceleration.
The energy of electron is 2.5 eV. When expressed in Joule, it is
- 1.6 x 10-19 J
- 4.0 x 10-19 J
- 3.2 x 10-19 J
- 0
A block of mass 20 kg is pulled up a slope as shown in the figure given below with a constant speed by applying a force of 200 N parallel to the slope from the initial position A to the final position B. Work done in moving the block from A to B is:
- 600 J
- 500 J
- 60 J
- 200 J
