Dynamics Problem (Torque, Acceleration, Velocity - Angular)
An electric motor is running at 1200rpm when its power is cut off for 40 seconds, then turned back on. If the rotor weighs 60lb, has a radius of gyration of 8in, and experiences a power-on net torque of 100lb/in and power-off friction torque of 8lb/in, the rotational speed in rpm of the motor 2 seconds after the power is turned ...continues
Dynamics Problem (Tangential Acceleration, Velocity)
A board rides on two driving drums. At the instant shown (*see attached), the board has the acceleration noted. If the board is not slipping on the drums and the total acceleration of the drum contact points is 3m/s[squared], the velocity in m/s of the board at this instant is closest to which answer choice? a. 0.8 b. 0.9 c. ...continues
Dynamics Problem - Backspin (Friction, Velocity)
A 1.2ft diameter ball is thrown onto a rough surface, such that it has a velocity of 6ft/s and a backspin angular velocity of w. If it is to stop backspinning at the same instant as the velocity is 0, the backspin w in rad/s is what? HINT: The answer is independent of the mass and coefficient of friction. a. 17.8 b. 22.0 c. 2 ...continues
Dynamics Problem (Torque, Angular Acceleration)
A slender rod of mass Mr has a disk of mass Mo fastened to it at its end. It is pinned at 0 - a "frictionless" pin. The circular frequency in rad/s of the system for small oscillations is what? *Please see attachment for diagram, figures and multiple choice answers; please show your work.
Solve for Force (Engineering Dynamics)
Two forces act on a slender bar that is pinned at (see attachment). The horizontal reaction at 0 is 5 lb to the right, the force F in lb is closes to which answer choise? a) 25 b) 30 c) 15 d) 27 *Please see attachment for equations and diagram
Solving for Tangential (Angular) Acceleration (Engineering Dynamics)
For the apparatus shown (see attachment), if block A has an acceleration of 1ft/second[squared] upward, the angular acceleration in rad/second[squared] of the pulley B is what? a. 2.0 b. 1.0 c. 4.0 d. 0.25 *Please see attachment for proper citation of acceleration and for diagram.
Dynamics (Angular Velocity, Angular Acceleration)
2 practice quiz problems which I need help on. Please give explaination of each problem as well as answer: 1) Member AB rotates about pin A at a constant 10 rad/s. What is the acceleration of point C at the instant shown? a) 13.4m/s^2 b) 7.51m/s^2 c) 17.2 m/s^2 d) 11.5 m/s^2 e) 9.63 m/s^2 2) Wheel A rotates countercl ...continues
I am to solve a tipping problem of a 4-wheeled cart, weighing 36 kg, and being pushed to move in a range of between 1 and 6 m/sec. When the cart is moving at constant velocity within this range, the front two wheels suddenly encounter a permanent barrier and are stopped instantaneuosly. The cart is to be redesigned for no or min ...continues
I am looking for the solution of this problem. Also, I would like to know which answer is correct out of the four that I provide.
Moment of Inertia, Translational Mmotion
These problems have to do with moment of inertia, and translational motion. See attachment for complete questions and diagrams. 1. A four-wheel truck that has a mass of 5,000 kg accelerates forward. The coefficient of friction for the front and back wheels is 0.2 and 0.4, respectively. What is the acceleration of the truck? ...continues
