Centripetal Force Help (1 Viewer)

[shantu1992]

1. a mass of 1.6 kg moves in a circle of radius 22.0 cm at 3 revs/ second. calculate

(a) the tangential force
(B) the centripetal acceleration
(c) the centripetal force

2. a bob of mass 6.0 kg is attatched to a light inextensible, string of length .500 m. it is then caused to describe uniform circular motion about the other end of the string, which is fixed. the bob completes 40 revs every minute. calculate the following

(a) the period f the motion
(b) the centripetal acceleration of the bob
(c) the centripetal force acting on the bob


thanks heapps

 

[iEdd]

Stop posting questions in the exam thoughts forum. People that have just finished their HSC this week, including physics couldn't be bothered solving these. You will get a lot more help if you use the correct forum. You should PM a mod to move your threads there.

You want:

Bored of Studies > Secondary Education > New South Wales (HSC) > Science > Physics

Not

Bored of Studies > Exam Thoughts > Physics

To help with your questions though. For question 1 you need to convert radius to metres, then to circumference. Use that circumference and revs/second to convert to ms^-1. Place it into F=(mv²)/R to get centripetal force, then substitute into F=ma to get centripetal acceleration.