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How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall ? (`g = 10 m s^(-2)`)

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50 kg

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How much is the mass of a man if he has to do 2500 joule of work in climbing a tree 5m tall ? (g = 10 m//s^(2))

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In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m. (a) How much work does he do in lifting one box ? (b) How much energy is transferred when one box is lifted ? (c) If the man lifts 4 boxes per minute, at what power is he working ? ( g = 10 m s^(-2 )

A trolley is being up an incline plane by a man inside the trolley He applied a force of 500 N. If the mass of the man is 50 kg and trolley is 150 kg, then the acceleration of the trolley will be : ( g = 10 m//s^(2) )

What is the work done to fits to lift a body of mass 5 kg to a height of 50 m from the ground (in J)? (g = 10 m s^(-2) )

The mass of a sphereical planet is 5 times the mass of the earth, but its diameter is the same as that of the earth. How much work is done in lifting a stone of mass 3 kg through a distance of 1 m on the planet ? [g on the surface the earth = 10 m//s^(2) ]

A man weighing 70kg carries a weight of 10kg on the top of a tower 100 m high. Calculate the work done by the man. (g = 10m//s^2)

A monkey of mass 30 kg climbs a rope which can withstand a maximum tension of 360 N. The maximum acceleration which this rope can tolerate for the climbing of monkey is: (g=10m//s^(2))

LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. (a) On what factors does the gravitational potential energy of a body ...

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  2. Give two examples where a body possesses both , kinetic energy as well...

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  3. How much is the mass of a man if he has to do 2500 joules of work in c...

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  4. If the work done by a force in moving an object through a distance of ...

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  5. A boy weighing 40 kg makes a high jump of 1.5 m. (i) What is his kin...

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  6. What type of energy is possessed : (a) by the stretched rubber strin...

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  7. A weightlifter is lifting weights of mass 200 kg up to a height of 2 m...

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  8. (a) Define the term 'work'. Write the formula for the work done on a b...

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  9. (a) When do we say that work is done ? Write the formula for the work ...

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  10. (a) What happens to the work done when the displacement of a body is a...

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  11. (a) Define the term 'energy' of a body. What is the SI unit of energy....

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  12. (a) What do you understand by the kinetic energy of a body ? (b) A b...

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  13. (a) Explain by an example what is meant by potential energy. Write dow...

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  14. (a) What is the difference between gravitational potential energy and ...

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  15. A car is accelerated on a lavelled road and attains a velocity 4 times...

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  16. A car is accelerated on a lavelled road and attains a speed of 4 times...

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  17. In case of negative work, the angle between the force and displacement...

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  18. An iron sphere of mass 10 kg has the same diameter as an aluminium sph...

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  19. A girl is carrying a school bag of 3 kg mass on her back and moves 200...

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  20. The work done on an object does not depend on the :

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