ECAT Pakistan · Physics

Mechanics, Rotational Dynamics and Fluids

9 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 9 questions

  1. Water flows through a horizontal pipe of varying cross section. At point 1, diameter is 10 cm and velocity is 2.0 m/s. What is the flow velocity at point 2 where diameter is 5.0 cm?
  2. A flywheel of moment of inertia I = 4.0 kg m^2 is rotating at an initial angular speed of 30 rad/s. A constant frictional torque of 12 N m is applied. How long does it take for the flywheel to come to…
  3. According to Bernoulli's principle for steady horizontal fluid flow, what occurs in a region where fluid velocity increases?
  4. A particle of mass m moves in a circle of radius r with constant speed v. What is the net work done by the centripetal force during one complete revolution?
  5. What is the terminal velocity of a spherical steel ball of radius r falling through a viscous oil of viscosity eta according to Stokes' Law?
  6. What is the radius of gyration k of a thin uniform spherical shell of radius R about its diameter?
  7. A 100 g bullet moving horizontally at 400 m/s embeds itself into a stationary wooden block of mass 3.9 kg suspended by cords. What is the initial velocity of the block-bullet system immediately after…
  8. What physical quantity is defined as the rate of change of angular momentum?
  9. A simple harmonic oscillator has amplitude A = 0.10 m and spring constant k = 200 N/m. What is its total mechanical energy?

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