Question

I just need help with part c) please/thank you

A solid brass ball of mass 20.9 g and radius 8.37 mm rolls smoothly along a loop-the-loop track when released from rest from a tall ramp leading to the loop-the-loop. The circular loop has a 12 cm radius.

(a) What is the minimum height from which you can release the ball so that it will go around the loop-the-loop without falling off?

32.4 cm Correct: Your answer is correct.

For part (b), assume that the ball is released from rest at a height of 44.56 cm above the bottom of the loop.

(b) What is the magnitude of the horizontal force on ball when it is at a height 12 cm going up the hoop?

0.7947 N Correct: Your answer is correct.

(c)What is the direction of the net force on the ball at the top of the hoop?

f̂ = ________x̂ + ________y hat

Answer 1

c Ans: The net force will be in the negative y direction because the normal reaction and the weight will be downwards.

i.e.

   $\vec{F}=0\ \hat x-0.794\ \hat y$