Question

I need help setting up. Physics Question.

Answer 1

In the game of tether-ball, a 1.25 m rope connects a
M= 0.780 kg ball to the top of a vertical pole so that
the ball can spin around the pole as shown in the figure below.
http://i.imgur.com/Tb0DjOD.jpg
((Copy paste, don't click, just in case...))

What's the speed of the ball as it rotates around the pole
when the angle θ of the rope is 36.0º with the vertical?

Answer 2

Hint :

The ball is in circular motion in the horizontal plane. So, there must be a centripetal force on the ball, which pushes the ball continuously towards the center.

Answer 3

Yes,

\(F_c=mv^2/R\)

Answer 4

Yes, but who is providing that force ?

Answer 5

The weight, perhaps?
I am sorry, I am not sure.

Answer 6

Thanks for helping:(

Answer 7

Nope, the weight is always perpendicular to the motion of the ball. So gravity cannot do any work on the ball.

Answer 8

Imagine you're that ball.

Don't you feel the rope pulling you along the rope ?

Answer 9

You're pulling the rope towards you.
The rope pulls you towards itself.

This type of force is called "tension"

Answer 10

Lets find out tension in the rope first

Answer 11

Tension is m*g ?

Answer 12

Start with FBD on the ball. What are all the forces that are acting on the ball ?