##### Q11 Help With Physics Problem question 11

label Physics
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Jun 24th, 2015

Here how to solve this problem

You are given the mass of the ball  and the distance. First, you need to find the radius, r of the circle that the ball is rotating around.

The equation for finding the velocity of the ball in circular movement is

v = 2*Pi * r/ T

The equation for the period, T is T = 2*Pi*r/ V

So you need to solve for the radius. The ball is hanging in the thread and rotating like a cone shape. So you need to find the radius, r of the cone. You are given the height, h= 1.9m  of the cone. The equation to find the r of the cone is

r = h * tan( 32 degree)

r = 1.9 * (0.624)

= 1.18 m

To find the velocity, use this equation

v = (g*r)^2

= (9.8 m/s^2 * 1.18m)^2

= 3.4 m/s

So the speed of the ball in circular motion is 3.4 m/s

Let answer the second question of how long it takes , Tperiod  for the ball to rotate once around the axis.

Tperiod = 2 Pi * r/ V

= (2 * 3.14* 1.18m) / 3.4 m/s

= 2.18 s

Jun 24th, 2015

Its wrong

Jun 24th, 2015

Hi,

What is wrong with the answer?

Jun 24th, 2015

the homework site said the answer is incorrect

Jun 24th, 2015

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Jun 24th, 2015
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Jun 24th, 2015
Sep 26th, 2017
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