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A lineman of mass 60 kg is holding a ver...

A lineman of mass 60 kg is holding a vertical pole . The coefficient of the static friction between his hands and the pole is `0.5` . If he is able to climb up the pole , what is the minimum force with which he should press the pole with his hands ? ( g = `10 m//s^(2)`)

A

1200 N

B

600 N

C

300 N

D

150 N

Text Solution

Verified by Experts

The correct Answer is:
A
`mu N = Mg`
`N = ("Mg")/(mu)`
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GRB PUBLICATION-FRICTION AND CIRCULAR MOTION -OBJECTIVE QUESTIONS ( only one choice is correct )
  1. A block of mass m lying on a rough horizontal surface of friction coef...

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  2. A block of mass 0.1 is held against a wall applying a horizontal force...

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  3. A lineman of mass 60 kg is holding a vertical pole . The coefficient o...

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  4. A ball weighing 10g hits a hard surface vertically with a speed of 5m/...

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  5. A heavy box of mass 20 kg is pulled on a horizontal surface by applyin...

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  6. A block takes a twice as much time to slide down a 45^(@) rough incli...

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  7. A block of mass 2 kg rests on a rough horizontal plank , the coefficie...

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  8. A block released from rest from the top of a smooth inclined plane of...

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  9. A block of mass 10 kg is sliding on a surface inclined at 30^(@) with ...

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  10. A block of mass 6 kg is being pulled by force 24 N as shown . If coeff...

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  11. Coefficient of static friction between the two blocks in Fig. 7.124 is...

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  12. In Fig.7.125, coefficient of friction between m(1) and m(2) is mu and ...

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  13. If, in Q.19, coefficient of friction between m(1) and the wall is mu,a...

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  14. The rear side of a truck is open and a box of 40 kg mass is placed 5 m...

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  15. Three blocks are kept as shown in figure Acceleration of 20 kg block w...

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  16. Two block of masses m1 and m2 are connected with a massless unstretche...

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  17. Two thin roads are moving perpendicularly as shown in the figure. If t...

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  18. Wedge is fixed on horizontal surface. Block A is pulled upward by appl...

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  19. Two blocks A & B attached to each other by a mass-less spring, are kep...

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  20. In the shown arrangement if f(1),f(2) and T be the frictional forces o...

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