Homework Help: physics

Posted by mike on Saturday, October 25, 2008 at 2:06pm.

A 3.2 kg block sits on a frictionless table that has a hole cut in the middle of it. The 3.2 kg mass is connected to a string that goes through the hole in the table and attaches to a 4.8 kg mass. The 3.2 kg mass moves in a circle of radius 0.2 m
How fast does it have to be moving so thaf the 4.8kg mass does not fall? Also what is the tension in the string?

physics - Damon, Saturday, October 25, 2008 at 4:10pm
Force up = tension in string = 9.8*4.8 = 47 N
so
47 = m v^2/r
47 = 3.2 * v^2 /.2
v = 1.71

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