Physics Rotational Mechanics Level: High School
An airliner arrives at the terminal , and the engines are shut off . The rotor of one of the engines has an initial clockwise angular speed of 2000 rad/s . The engine’s rotation slows with an angular acceleration of magnitude 80.0 rad/s^2 .(a) Determine the angular speed after 10.0 seconds .
(b) How long does it take the rotor to come to rest ?
Physics Rotational Mechanics Level: High School
If you see an object rotating ,a . There has to be net torque acting on the object .
b . There may be no net torque acting on the object .
Physics Rotational Mechanics Level: High School
Explain why changing the axis of rotation of an object changes its moment of inertia .
Physics Rotational Mechanics Level: High School
If a car’s standard tires are replaced with tires of larger outside diameter , What will happen to the reading of the speedometer ?a . It will read faster than the actual speed of the car.
b . It will read slower than the actual speed of the car .
c . It will remain the same reading as the actual speed of the car .
Physics Rotational Mechanics Level: High School
A hoop of radius 0.5 m and a mass of 0.2 kg is released from the rest and allowed to roll down an inclined plane . How fast is it moving after dropping from a vertical distance of 3 m ?3.8
2.2
5.4
7.7
Physics Rotational Mechanics Level: High School
Consider two uniform solid spheres where both have the same diameter , but one has twice the mass of the other . The ratio of the larger moment of inertia to that of the smaller moment of inertia is .2
8
10
4
6
Physics Rotational Mechanics Level: High School
A ball , solid cylinder and a hollow pipe all have equal masses and radii . If the three are releases simultaneously at the top of an inclined plane , which will reach the bottom first ?ball
none of the listed
cylinder
pipe
Physics Rotational Mechanics Level: High School
A wheel with a moment of inertia of 8.0 kg –m^2 and a rotational kinetic energy of 155 Joules requires what torque to bring it to rest in 4.0 s ?-1.6 N-m
-1.8 N-m
-1.0 N-m
-1.2 N-m
Physics Rotational Mechanics Level: High School
Equilibrium
A force is applied to the end of a 2 ft long uniform board weighing 50 lb , in order to keep it horizontal , while it pushes against a wall at the left , If the angle of the force makes with the board is 30 degree in the direction shown , the magnitude of the applied force F is50 lb
100 lb
57.7 lb
28.9
Physics Rotational Mechanics Level: High School
A driver can change her rate of rotation in the air by “tucking” her head in and bending her knees . Lets assume that when she is stretched out straight she is rotating at 1 revolution per second . Now she goes into the “tuck and bend” effectively shortening her length of her body by hair . What will her rate of rotation be now ?5 Hz
4 Hz
Physics Rotational Mechanics Level: High School
A solid wood door , 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg . It is ajar and at rest. A ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side . The ball rebounds with a speed 16.0 m/s along the same line . What is the angular speed of the door after the collision ?
Physics Rotational Mechanics Level: High School
A uniform ball with a mass of 125 grams is rolling without slipping along the horizontal surface of a table with a speed of 4.50 m/s when it rolls of the edge and fails towards the floor , 1.10m below . What is the rotational kinetic energy of the ball just before it hits the floor ?
Physics Rotational Mechanics Level: High School
A 3.50 g bullet , traveling at 250 m/s hits a hinged , light board at a right angle a distance of 65.0 cm from its hinges and emerges on the other side of the board with a speed of 150 m/s . The board is initially stationary , is free to rotate about its hinges and has a moment of inertia of 0.275 kg X m squared . What is the angular speed of the board after the bullet emerges ?
Physics Rotational Mechanics Level: High School
Each of a pair of binary stars with individual mass (M) is in circular orbit of radius (R) . The system’s center of mass is at rest . What is the speed of each star in terms of G , M and R ?
Physics Misc Topic Level: Misc Level
A bullet of mass (m) and initial speed (v) strikes , and is embedded in , the end of a uniform rod of mass (2m) and length (L) originally at rest. The rod pivots about a fixed axis at its center .(a) What is the angular momentum of the bullet/rod system with respect to the axis through the rod’s pivot ?
(b) What is the angular speed of the rod after the collision ?
(c) How much kinetic energy is lost in the collision ?
