Homework Help: Physics

Posted by Emily Grossman on Monday, February 21, 2011 at 9:58pm.

How do you solve this problem?
A ball on the end of a string is revolved at a uniform rate in a vertical circle radius of 72.0 cm, as shown in figure. If its speed is 4.00m/s and its mass is .300 kg. Calculate the tension in the string when the ball is a) at the top of the path, and b). when it's at the bottom?

Physics - drwls, Monday, February 21, 2011 at 10:05pm
a) Mg + T = MV^2/R
T = M(V^2/R -g)

b) T - Mg = MV^2/R
T = M(V^2/R + g)

T is the tension that you want to compute.
Make sure R is in meters when you do the calculation. The force will be in Newtons.
Physics - Emily Grossman, Monday, February 21, 2011 at 10:11pm
Can you like work the problem out so i can see how it is done?
Physics - Emily Grossman, Monday, February 21, 2011 at 10:15pm
what is the V in this case? That's what throwing me off..
Physics - bobpursley, Monday, February 21, 2011 at 10:25pm
V is velocity, given as 4m/s
Physics - Emily Grossman, Monday, February 21, 2011 at 10:33pm
Okay, I worked them out, but I am not getting the answer they should be. Like a) i am getting as what should be the answer as b. So, i don't if someone could work them out or tell me maybe what doing wrong. Thanks!
Physics - drwls, Tuesday, February 22, 2011 at 2:20am
If the answers to a and b answers are interchanged, your book may be wrong.

All you have to do is use the formulas provided, using these variables:
V = 4.0 m/s
M = 0.3 kg
g = 9.8 m/s^2
R = 0.72 m
Physics - Emily Grossman, Tuesday, February 22, 2011 at 12:10pm
Okay, so for a) get 3.13 and b). get 16.5?

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