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Is Power a Scalar Or a Vector Quantity? - Physics

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प्रश्न

Is power a scalar or a vector quantity?

एक पंक्ति में उत्तर

उत्तर

Power is a scalar quantity.

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अध्याय 1: Force, Work, Power and Energy - Short Answers

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आईसीएसई Physics [English] Class 10
अध्याय 1 Force, Work, Power and Energy
Short Answers | Q 49.2

संबंधित प्रश्न

Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.


Derive a relationship between S.I. and C.C.S. unit of work


The S.I. unit of energy is .............


State two conditions when no work is done by a force.


Give reasons for the following. No work is done if a man is pushing against a wall.


A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.


A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:

  1. the work done, and
  2. the power developed by them. Take g = 10 N kg-1.

A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.


Fill in the blank with suitable word :
Work is measured as a product of __________ and __________


Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.


Give two examples of couple action in our daily life.


Does the earth move around the sun with a uniform velocity?


What is the SI unit of work?


Why is the work done on an object moving along a circular path zero?

What is the P.E. of a body lying on the surface of the earth?

In what form is energy stored in a wrist watch?

List any six forms of energy and write a short note on each of them.


In the following case write yes, if the work is being done and no if no work is being done.

A coolie standing with a heavy load on his head


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

Food grains are getting dried in the sun.


A force of F = (5y + 20) `hat"j"` N acts on a particle. The work done by this force when the particle is moved from y = 0 m to y = 10 m is ______ J.


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