A ball of mass 10 g moving with acceleration of 20 m/s2 is hit by

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 Multiple Choice QuestionsMultiple Choice Questions

101.

A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is μ = 0.5. The distance that the box - will move relative to belt before coming to rest on it taking 

g= 10 ms-2 is

  • 1.2 m

  • 0.6 m

  • zero

  • zero

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102.

A ball is dropped from  a high-rise platform at t=0 starting from rest. After 6s another ball is thrown downwards from the same platform with a speed v. The two balls meet at t= 18s. What is the value of v? (take g= 10 ms-2)

  • 74 ms-2

  • 55 ms-1

  • 40 ms-1

  • 40 ms-1

1022 Views

103.

A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation straight s equals 1 third straight t squared, where t is in s. Work done by the force in 2 s is:

  • 5 over 19 straight J
  • 3 over 8 straight J
  • 8 over 3 straight J
  • 8 over 3 straight J
737 Views

104.

A particle moves along a straight line OX. At a time t (in seconds) the distance x (in metres) of the particle from O is given by
        straight x equals 40 straight t space plus 12 straight t minus straight t cubed
How long would the particle travel before coming to rest?

  • 24m

  • 40m

  • 56m

  • 56m

782 Views

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105.

The x and y coordinates of the particle at any time are x = 5t – 2t2 and y = 10t respectively, where x and y are in meters and t in seconds. The acceleration of the particle at t = 2 s is

  • 0

  • 5 m/s2

  • -4 m/s2

  • -4 m/s2

1927 Views

106.

A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field E . Due to the force q E, its velocity increases from 0 to 6 m/s in one-second duration. At that instant, the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively

  • 2 m/s, 4 m/s

  • 1 m/s, 3 m/s

  • 1.5 m/s, 3 m/s

  • 1 m/s, 3.5 m/s


107.

The radius of earth is 6400 km and g = 10 m/s2. In order that a body of 5 kg weight is zero at the equator, the angular speed is

  • 1800rad/sec

  • 11600rad/sec

  • 1400rad/sec

  • 180rad/sec


108.

A wheel rotates with constant acceleration of 2.0 radian/sec2 .If the wheel starts from rest the number of revolution it makes in the first ten second, will be approximately

  • 32

  • 24

  • 16

  • 8


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109.

A stone is thrown with an initial speed of 4.9m/s from a bridge in vertically upward direction.It falls down in water after 2sec. The height of bridge is

  • 24.7m

  • 19.8 m

  • 9.8 m

  • 4.9 m


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110.

A ball of mass 10 g moving with acceleration of 20 m/s2 is hit by a force which acts on it for 0.1 sec. The impulsive force is

  • 1.2Ns

  • 0.3Ns

  • 0.1Ns

  • 0.5Ns


B.

0.3Ns

Here:- Mass of the ball m= 10 g ; time dt =0.1 sec ;

acceleration of the ball = 20m/s2

Force F =ma =0.15×20 =3N

 

Impulsive forces are forces that act over short times producing rapid changes in motion

 Impulsive force = F×dt = 3×0.1 =0.3 Ns


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