Advertisements
Advertisements
प्रश्न
Avinash can run with a speed of 8 m s–1 against the frictional force of 10 N, and Kapil can move with a speed of 3 m s–1 against the frictional force of 25 N. Who is more powerful and why?
Advertisements
उत्तर
Since, Power = Force × Velocity
∴ Power of Avinash, PA = 10 N x 8 m s−1= 80 W
Power of Kapil, PK = 25 N x 3 m s−1 = 75 W
As PA > PK so, Avinash is more powerful than Kapil.
APPEARS IN
संबंधित प्रश्न
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in photosynthesis in green leaves.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the burning of a match stick.
State the energy changes in the following case while in use:
Microphone
State the energy changes in the following case while in use:
Washing machine
State the energy changes in the following case while in use:
A petrol engine of a running car
State the energy changes in the following case while in use:
An electromagnet.
Law of conversation of energy given by ______.
A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a roundabout (Fig. 11.1) of radius 100 m. However, he moves on the circular path for one and half-cycle and then he moves forward up to 2.0 km. Calculate the work done by him.
Can any object have mechanical energy even if its momentum is zero? Explain.
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has larger kinetic energy?
