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A man is instructed to carry a package f...

A man is instructed to carry a package from the base camp at B to summit A of a hill at a height of 1200 metres. The man weighs 800 N and the package weighs 200 N. If `g = 10 m//s^(2)`, (i) how much work does man do against gravity ?
(ii) what is the potential energy of the package at A if it is assumed to be zero at B ?

Text Solution

Verified by Experts

The correct Answer is:
(i) `12 xx 10^(5) J` (ii) `2.4 xx 10^(5) J`
NA
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
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  2. How much work is done by the gravitational force of earth acting on a ...

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  3. A man is instructed to carry a package from the base camp at B to summ...

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  4. When a ball is thrown vertically upwards, its velocity goes on decreas...

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  5. A man X goes to the top of a building by a vertical spiral staircase....

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  6. When a ball is thrown inside a moving bus, does its kinetic energy dep...

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  7. A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic ener...

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  8. COMMERCIAL UNIT OF ENERGY

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  9. One kilowatt-hour is equal to :

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  10. Name two units of power bigger than watt.

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  11. Define the term 'watt'.

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  12. One horse power is equal to

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  13. Name the physical quantity whose unit is watt.

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  14. What is the power of a body which is doing work at the rate of one jou...

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  15. A body does 1200 joules of work in 2 minutes. Calculate its power.

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  16. How many joules are there in one kilowatt-hour?

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  17. Name the quantity whose unit is : (a) kilowatt (b) kilowatt-hour

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  18. What is the common name of '1 kWh' of electrical energy?

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  19. A cell converts one form of energy into another form. Name the two for...

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  20. Name the device which converts electrical energy into mechanical energ...

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