Advertisements
Advertisements
प्रश्न
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
Advertisements
उत्तर
Mass of box = 20 kg
t = 5 minutes
Energy gained = force applied = 0
∵ Zero work is done, as there is no displacement of the man.
APPEARS IN
संबंधित प्रश्न
When do we say that work is done?
Define work.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Why is the work done on an object moving with uniform circular motion zero?
A uniform circular motion is an accelerated motion. Justify it.
List any six forms of energy and write a short note on each of them.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
What are the advantages and disadvantages of using solar cells for producing electricity?
