Physics 1/AP C: Rotational Kinematics, Rotational Inertia, Net Torque, Work
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Question 1
1.
A 1 m bar is held horizontally and used to open a crate. The bar is inserted 2 cm into the box and then the other end is pushed down using 20 N of force. What force is exerted on the box lid?
Question 2
2.
In the scenario above, what was the torque exerted by the bar? (express your answer in kg*m^2)
Question 3
3.
Newton's first law states that a point particle is in equilibrium if the net forces acting on it are zero. When are torques consdered in Newton's first law?
Question 4
4.
Triple the rotational velocity of an object and its rotational kinetic energy will
Question 5
5.
A propeller starts at rest then rotates about its midpoint with an angular acceleration of 12 rad/s^2. How much time will it take to rotate through π/2?
Question 6
6.
A cylinder has a moment of inertia, I. How much time does it take a torque, τ, to increase its angular speed from ω1 to ω2?
Question 7
7.
A barbell consists of a thin rod of uniform mass and two masses at each end. The rod is 0.40 m long and a mass of 0.2 kg. The two masses are each 5 kg. Find the rotational inertia of the barbell if it is rotated halfway between the center of mass and one of the masses.
Question 8
8.
A body with a moment of inertia of 4 kg*m^2 accelerates constantly from rest with an angular acceleration of 5 rad/s^2. How much time does it take to obtain a rotational kinetic energy of 800 J?
Question 9
9.
Calculate the net torque on the bar below.
Question 10
10.
How much work is done on the bar below over 5 seconds?
