# circuile motion and work-enegy theorem

Not what you're looking for?

A couple of circular motion problems... I realize that this is something I could have figured out if I had more time, but I am running out of it..please help.

1. A circular disk of radius 30 cm is rotating with an angular acceleration of 1 radian/ s2. What is the tangential acceleration of a point on the rim of the disk? What is its centripetal acceleration if the angular speed is 3 rev / s?

2. A 980 Kg car traveling at 20 m/s rounds a curve of radius 40 m. What is the friction force that must act on the car to keep it in its circular path?

3. An object with a mass of 100 Kg is dragged up an incline by applying a force F. The total distance moved along the incline is 200 m and the vertical height gained in moving this distance is 20 m. What is the magnitude of the force F if friction is negligible? (Assume g = 10 m/s2)

##### Purchase this Solution

##### Solution Summary

The first part of the solution is related to the circular motion, such as the angular acceleration, tangential acceleration, centripetal acceleration and centripetal force. The second part of the solution is the application of work-energy theorem to find the dragging force.

##### Solution Preview

Please see the attached file for detailed solution.

2. The friction here is the centripetal ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

##### Basic Physics

This quiz will test your knowledge about basic Physics.

##### Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

##### The Moon

Test your knowledge of moon phases and movement.

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.