Tuesday
July 29, 2014

Homework Help: physics

Posted by ken on Sunday, November 4, 2007 at 7:09pm.

A ball is attached to a string with length of L. It swings in a horizontal circle, with a constant speed. The string makes an angle (theta) with the vertical, and T is the magnitude of the tension in the string.

1)Determine the Mass of the Ball.
2)Determine th Speed of the Ball.
3)Determine the Frequency of revolutions of the Ball.

1)
F=Tsin(theta)=ma
m= (Tcos theta)/g

Tcos(theta)- mg= 0
T= mg/[cos(theta)]

F=Tsin(theta)
F= mg/[cos(theta)] * sin(theta) subtitute for T
F=mgtan(theta)

F=(mv^2)/r r=Lsin(theta)
mgtan(theta)=(mv^2)/ Lsin(theta)
v= square root of gLtan(theta)sin(theta)
3)
T= 2pi time square root of (l /g)
frequency= 1/t
frequency= 1/ [ 2pi time square root of (l /g) ]

I need comment about my solution. Thanks

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