EASY
9th Kerala Board
IMPORTANT
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A bird of mass 0.5 kg is flying with a constant speed maintaining the same height of 5 m. In this state, if its kinetic energy and potential energy are equal, what is the potential energy (in joules) of the bird? (Take g=10 m/s2).

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Important Questions on Work, Energy and Power

MEDIUM
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Exercise 3>Q ii
A bird of mass 0.5 kg is flying with a constant speed maintaining the same height of 5 m. In this state, if the kinetic energy and the potential energy are equal, what is the velocity (in m/s) of the bird? (Take g=10 m/s2).
MEDIUM
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Exercise 4>Q i
If a man of mass 70 kg climbs up a mountain of height 30 m in 5 minutes, what is his power (in watts)? (Take g=10 m/s2).
MEDIUM
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Exercise 4>Q ii
If a man of mass 50 kg takes 60 s to climb up 20 steps, each of 15 cm height, calculate his power (in watts). (Take g=10 m/s2).
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 1
A boy is trying to push the concrete pillar of a building using a force of 300 N. Calculate the amount of work done by the boy.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 2
From what you have learnt of potential energy and kinetic energy, write down the form of energy possessed by the water in a dam.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 2
From what you have learnt of potential energy and kinetic energy, write down the form of energy possessed by the stretched rubber band.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 2
From what you have learnt of potential energy and kinetic energy, write down the form of energy possessed by the mango falling down from a tree.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 3
Calculate the kinetic energy (in joules) of an athlete of mass 60 kg running with a velocity 10 m/s.