Physics question Help please!!
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Physics question Help please!!

[From: ] [author: ] [Date: 13-10-31] [Hit: ]
2.What is the tension in the string?Can you also please show your work so I know how you get the answer.and f= 90rpm/60 (to find the revolutions per second)f=1.hence Angular speed = 2*pi*1.5= 9.......
A 220g block on a 60.0cm -long string swings in a circle on a horizontal, frictionless table at 90.0rpm .


1.What is the speed of the block?

2.What is the tension in the string?

Can you also please show your work so I know how you get the answer. Thank you for the help

-
1) Angular speed = 2*Pi*f

and f= 90rpm/60 (to find the revolutions per second) f=1.5

hence Angular speed = 2*pi*1.5 = 9.4 rad/s

2) The tension must be equal to the centripetal force of the string so...

T= mass*radius*( Angular Speed squared) )

T=0.22*0.6*88.36

T= 12N
1
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