1. Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 21 Hw: Chapter 13 problems and exercises

2. A plane is flying in an arc at the speed of v 0. At the top of arc the passengers experience a sense of weightlessness. What is the radius of the arc?

3. A 3000 kg spacecraft is in a circular orbit 2000 km above the surface of Mars. How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4000 km above the surface?

4. Platform rotates with angular acceleration  (t)=  t. A man starts a distance L from the center and walks in along a straight line painted on the platform towards the center. He decreases his distance from the center as a constant rate, v c. What force does the platform exert on the man, as a function of his distance from the center?

5. Conical pendulum

6. A race track designer wants to have the cars able to maintain a speed v max without skidding on a circular track. If the track is flat with a coefficient of friction  what does the radius have to be?

7. H R A frictionless track contains a circular section of radius R as shown. What is the minimum height at which a block must be started in order for it to go around the loop without falling off the track?

8. Kinematics

9. Have a great day! Hw: Chapter 13 problems and exercises