A body of mass 3 kg is acted on by a force which varies as shown

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 Multiple Choice QuestionsMultiple Choice Questions

221.

A block of mass 2 kg is kept on the floor. The coefficient of static friction is 0.4. If a force F of 2.5 N is applied on the block as shown in the figure, the frictional force between the block and the floor will be

  • 2.5 N

  • 5 N

  • 7.84 N

  • 10 N


222.

The minimum velocity (in ms-1) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction to avoid skidding is

  • 60

  • 30

  • 15

  • 25


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223.

A body of mass 3 kg is acted on by a force which varies as shown in the graph. The momentum acquired is given by

    

  • zero

  • 5 N-s

  • 30 N-s

  • 50 N-s


D.

50 N-s

Momentun = Area of the graph

                = 12 × 2 × 10 + 10 × 4

                = 10 + 40 

                = 50 N-s


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224.

A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by

  

  • 2 Mg

  • 2 mg

  • M+ m2 + m2g

  • M + m2 + M2 g


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225.

A body of mass 5 kg moves on a straight path as a function of time x = t3 − 12t. The force on the body at t = 5s will be

  • 100 N

  • 150 N

  • 120 N

  • 130 N


226.

n balls each of mass m impinge elastically each second on a surface with velocity v. The average force experienced by the surface will be

  • 2nmv

  • nmv

  • nmv2

  • 4nmv


227.

The angle to which a cyclist bends when he covers a circular path of 34.3 m in 22 s is

  • 20°

  • 30°

  • 60°

  • 45°


228.

A gun of mass M fires a bullet of mass m with velocity v. Then, the recoil speed of the gun will be

  • -mMv

  • 2mMv

  • Mmv

  • 2Mmv


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229.

If the coefficient of static friction between the tyres and road is 0.5, what is the shortest distance in which an automobile can be stopped when travelling at 72 kmh-1 ?

  • 50 m

  • 60 m

  • 40.8 m

  • 80.16 m


230.

The upper half of an inclined plane with inclination ϕ is perfectly smooth, while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom, if the coefficient of friction for the lower half is given by

  • 2 sin ϕ

  • 2 cos ϕ

  • 2 tan ϕ

  • tan ϕ


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