Advertisements
Advertisements
प्रश्न
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
Advertisements
उत्तर
The displacement of the man and suitcase is along the horizontal direction. Thus, the angle between the displacement and the force of gravity is 90°;
Thus, W = Fd cos 90° = 0
Hence, no work is done against gravity in this case.
APPEARS IN
संबंधित प्रश्न
Define 1 J of work.
When is work said to be done by a force?
Name the force acting away from the centre of circular path.
Give two examples of work done.
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
Give an example
Electrical energy changes to heat energy.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
