Just checking that I have these right:
1) A particle traveling around a circle at constant speed will not experience an acceleration. False
2) A particle travels 18 times around an 11-cm radius circle in 45 seconds. What is the average speed in m/s of the particle?
Circumf: 2 x pi x .011m = .0691m
Total dist: 18 x .0691m = 1.2441m
Avg speed: d/t = 1.2441m/45s = .0276m/s
3) What measurements will be made to determine the magnitude of the test-mass centripetal acceleration?
- ** The mass of the test-mass.**
- ** The velocity of the test-mass.**
- ** The radius of the circular path.**
- ** The mass of the hanging mass.**
- ** The spring constant.**
- ** The period of the orbital motion.**
4) A particle in uniform circular motion requires a net force acting in what direction? Towards the center of the circle
5) The centripetal force acting on a particle is given by F = mv2/r. If the centripetal force and mass are kept constant, decreasing the radius of the particle’s circular path will mean that the particle’s velocity must decrease. True
Answer:
- false. (It will experience centripetal acceleration)
- v=wr =(2\pin/t)r =2\pi18/45)*0.11 =0.2765m/s
- 3-6 are correct
- Towards the center of the circle.
( Without such an inward force, an object would continue in a straight line) - when V^2/r =constant =>If r decreases, v also decreases.