Question

Questions on veritical circular motion: (any help with any problem appreciated!)

1. What’s the apparent weight of a 70kg person going 10m/s over a bump
with radius of curvature 10m. Use g = 10m/s^2
A) 0N
B) 700N
C) 350N
D) 1050N

2. A motorcycle maintains constant speed as it goes through a loop. Where is the centripetal acceleration of the bike greatest?
A) left
B) bottom
C) top
D) centripetal acceleration is constant

Answer 1

3. A ball is tied to the end of a 100cm long string. If it has enough speed at the bottom, it will move in a circular path. What is the minimum speed needed at the bottom for the ball to get to the top of the circle?
A) 0.00m/s
B) 3.13m/s
C) 4.42m/s
D) 9.80m/s
4. A toy car travels down a track and through a loop of radius r. From what minimum initial height h does it need to be released so that it stays on the track through the loop?
A) h = 3r/2
B) h = 3r
C) h = 5r/2
D) h = 2r

Answer 2

W=weigth
N=force from serface=apparenr weight
total force must be what???? (circular motion!!!!)