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Work, Energy and Power Test - 80

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Work, Energy and Power Test - 80
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Weekly Quiz Competition
  • Question 1
    4 / -1
    A nucleus at rest splits into two nuclear parts having same density and radii in the ratio 1:2. Their velocites are in the ratio
    Solution

  • Question 2
    4 / -1
    A single conservative force F(x) acts on a 2.5 kg particle that moves along the x–axis. The potential energy U(x) is given by U(x) = (10 + (x – 4)2) where x is in meter. At x = 6.0 m the particle has kinetic energy of 20 J. What is the mechanical energy of the system ?
  • Question 3
    4 / -1
    From an automatic gun a man fires 240 bullet per minute with a speed of 360 km/h. If each weighs 20 g, the power of the gun is
    Solution

  • Question 4
    4 / -1
    A body is moved along a straight line by a machine delivering a constant power. The velocity gained by the body in time t is proportional to.....
    Solution

  • Question 5
    4 / -1
    A particle of mass m moving with horizontal speed 6 m/s as shown in figure. If m << M then for one dimensional elastic collision, the speed of lighter particle after collision will be

    Solution

  • Question 6
    4 / -1
    Three objects A, B and C are kept in a straight line on a frictionless horizontal surface. These have masses m, 2m and m respectivelly. The object A moves towards B with a speed 9 m/s and makes an elastic collision with it. Thereafter, B makes compelety inelastic collision with C. All motion occur on the same straight line. Find final speed of the object C

    Solution

  • Question 7
    4 / -1
    A metal ball of mass 2 kg moving with a velocity of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after the collision, the two balls move togather, the loss in kinetic energy due to collision is
    Solution

  • Question 8
    4 / -1
    A mass of 100g strikes the wall speed 5 m/s at an angle as shown in figure and is rebounds with the same speed. If the contact time is 5 × 10–3 sec, what is the force applied on the mass by the wall

    Solution

  • Question 9
    4 / -1
    A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be
    Solution

  • Question 10
    4 / -1
    Two small particles of equal masses start moving in opposite directions from a point. A in a horizontal circular orbit. Their tangential velocities are v and 2v, repectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at A, these two particles will again reach the point A

    Solution

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