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Physics Test 78

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Physics Test 78
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Weekly Quiz Competition
  • Question 1
    4 / -1

    A car moving with speed of 10 m/s in a circle of radius 25m. Driver applies brakes producing a constant deceleration of  3m/s2. Then the angle between acceleration and velocity just after applying the brakes is

    Solution

     

  • Question 2
    4 / -1

    An object moves anticlockwise in a circular path with centre C. Its acceleration vector continuously points towards O, where AB is diameter. Then correct statement is/are :-

    (A) it speeds up from A to B & slows down from B to A

    (B) it slows down from A to B & speed up from B to A.

    (C) its maximum speed is at A.

    (D) its minimum speed is at A.

  • Question 3
    4 / -1

    In which case magnitude of angular acceleration is continuously decreasing ?

    Solution

     

  • Question 4
    4 / -1

    Which of the following are always true for circular motion :-

  • Question 5
    4 / -1

    If a particle moving in circle of radius r is described by:
    θ =  at2 – bt + c, then the linear speed of particle at t = 2s is :-

    Solution

     

  • Question 6
    4 / -1

    A thin rod of mass m and length ℓ is rotating in the horizontal plane about one of its ends with constant angular velocity ω. The tension at the middle point of the rod is : -

    Solution

     

  • Question 7
    4 / -1

    A particle moving in a plane is acted upon by a force of constant magnitude that is always perpendicular to the velocity of the particle Pick out the correct statement from the following –
    s1 : Acceleration is constant
    s2 : Kinetic energy is constant
    s3 : Velocity is constant
    s4 : The Particle moves in a circular path.

    Solution

     

  • Question 8
    4 / -1

    A particle starts circular motion on a circle of radius 40/π m under constant tangential acceleration. After completing the 4th revolution its speed becomes 100 m/s. Find magnitude of constant tangential acceleration

    Solution

     

  • Question 9
    4 / -1

    A particle of mass m is held at rest on the surface of a hemispherical bowl with respect to the bowl rotating with angular velocity ω radius of bowl is 0.5 m according to the figure radius of the circle of the particle is 0.4 m. Find angular speed of the bowl so that particle remains at rest relative to bowl in given condition all surfaces are smooth –

    Solution

     

  • Question 10
    4 / -1

    In case of circular motion of a body if tangential force also acts on the body in addition to centripetal force then work done-

    Solution

     

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