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A block of mass 1kg slides down a curved...

A block of mass `1kg` slides down a curved track which forms one quadrant of a circle of radius `1m` as shown in figure. The speed of block at the bottom of track is `v=2 ms^(-1)`. The work done by the of friction is
.

A

`+4 J`

B

`-4 J`

C

`-8 J`

D

`+ 8 J`

Text Solution

Verified by Experts

The correct Answer is:
C
Work done by friction friction `=E_(f) =E_(i)`
`=1/2 xx 1 xx (2)^(2)-1xx10xx1`
`=-8J`
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DC PANDEY ENGLISH-WORK, ENERGY & POWER-Level 2 Objective
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  2. A block of mass (m) slides along the track with kinetic friction mu. A...

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  5. A small mass slides down an inclined plane of inclination theta with t...

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  6. Two light vertical springs with equal natural length and spring consta...

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  7. A block of mass 1kg slides down a curved track which forms one quadran...

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  9. A rod mass (M) hinged at (O) is kept in equilibrium with a spring of s...

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  11. A particle free to move along x-axis is acted upon by a force F=-ax+b...

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  15. A uniform chain of length of length pir lies inside a smooth semicircu...

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