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A man X goes to the top of a building b...

A man X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why ?

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The correct Answer is:
Both the men, X and Y, do equal amount of work against gravity because irrespective of wether they reach the top of building by using a spiral staircase or a slanting ladder, the vertical distance moved by them against gravity is the same
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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
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  2. When a ball is thrown vertically upwards, its velocity goes on decreas...

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

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

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

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  6. COMMERCIAL UNIT OF ENERGY

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  7. One kilowatt-hour is equal to :

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  8. Name two units of power bigger than watt.

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  9. Define the term 'watt'.

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  10. One horse power is equal to

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  11. Name the physical quantity whose unit is watt.

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

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

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

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

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

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

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

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  19. Name the devices or machines which convert : (a) Mechanical energy i...

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  20. Name the devices or machines which convert : (i) Electrical energy i...

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