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प्रश्न
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
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उत्तर
Momentum of the ball = mass x velocity
= 0.5 x 15=7.5 kgm/s
संबंधित प्रश्न
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Express joule in terms of erg.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
What is the work done when the object acted upon by a force remains at rest?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
Who is the odd one out?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
