I have a problem where I've solved a and b. I need to solve c.

It's a centripetal force problem.
So far I have.
v(speed)=2.5pi
R(radius)=3.5
m(mass)=2
t(time)=2.8
Ac (centripetal acceleration)=17.62

How would I find tension?
(Hint: The tension provides Fc) Fc is centripetal force or net force.
How would I figure this out?

tension= mass*centripetal acceleration.

To find the tension in this problem, we need to use the equation for centripetal force, which is given by:

Fc = m * Ac

Where Fc is the centripetal force, m is the mass of the object, and Ac is the centripetal acceleration. In this case, you have already calculated Ac as 17.62.

Now, we can substitute the given values into the equation:

Fc = m * Ac
= 2 * 17.62
= 35.24

So, the centripetal force (Fc) is 35.24.

However, the tension in the problem provides Fc, which means the tension is equal to the centripetal force.

Therefore, the tension in this problem is also 35.24.