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An object of mass m slides down a hill o...

An object of mass m slides down a hill of height h and of arbitrary shape and stops at the bottom because of friction. The coefficient of friction may be different for different segments of the path. Work required to return the object to its position along the same path by a tangential force is

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2 mgh
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NN GHOSH-FRICTION, WORK POWER AND ENERGY-Exercises (B)
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  2. The total mass of an elevator with a 80 kg man in it is 1000 kg. This ...

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  3. Two masses 1.65 kg and 3.30 kg are joined together by a massles rod pa...

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  4. A body of mass m was slowly hauled up the hill as shown in the fig. by...

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  5. Following are three equations of motion S=ut+(1)/(2)at^(2) v(s)=s...

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  6. An escalator joins one floor with another 10 m above. The escalator is...

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  7. A ball of mass m is projected horizontally with velocity v into the ba...

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  8. A block of mass 2kg slides on a frictionless table with with a speed o...

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  9. An ideal massless spring is compressed by 1 m by a force of 100 N. The...

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  10. Masses M(1),M(2) and M(3) are connected by string of negligible mass w...

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  11. The handles of a table-drawer are equidistant from the sides of the dr...

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  12. A fixed pulley carries a weightless thread with masses m(2) and m(1) a...

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  13. A block of mass m is placed on the rough incline of a wedge of mass M ...

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  14. A car starts moving from rest along the circumference of a horizontal ...

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  15. A block of mass m=37.5 kg is placed on a table of mass M = 12.25 kg wh...

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  16. Water from the bottom of a dam of depth h comes out through a narrow p...

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  17. A 60 kg man leaps vertically from a crouching position when his centre...

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  18. What work should a man do to walk up a subway escalator moving down wi...

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  19. An object of mass m slides down a hill of height h and of arbitrary sh...

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  20. A skater standing on a perfectly floor holds on the nearby railing and...

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