- #1
aimen khattakk
- 17
- 1
[Note: Thread moved by moderator]
Hi! so I have a question I am unable to do and I've been trying it for 3 hours. The question had 2 parts, i figured out part a but cannot figure out part b.
A) A 0.006kg ball is dropped from a height of 4.0m above the floor. Neglecting air resistance, determine the momentum acting on the ball
So i did the following and the answer was correct:
Vf=Vi + 2ad
Vf = 0m/s + 2(-9.81m/s)(4.0m)
i solved for Vf and got 8.858893836m/s down
then solved for momentum
p = (0.06kh)(8.858893836m/s down )
p = 5.31x10^-1 kgm/s down
Now i can't do part B
B) The ball in part A bounces to a height of 3.0 m. if the collision with the floor took 0.024s, determine the normal force acting on the ball.
So i attempted it and this is what i did
F = MΔV/ΔT
F = (0.06kh)(8.858893836m/s down - 0m/s) / 0.024s
F = 22.15N this is the net force right?
So i now tried solving for the normal force knowing that gravity and normal force were acting on the ball so i did
Fnet = Fn - Fg
22.15N = Fn - mg
22.15N = Fn - (-0.5886N)
22.15N-0.5886N = Fn
so Fn = 21.56N
But the answer sheet i have says the answer is 42N so I am so lost
Hi! so I have a question I am unable to do and I've been trying it for 3 hours. The question had 2 parts, i figured out part a but cannot figure out part b.
A) A 0.006kg ball is dropped from a height of 4.0m above the floor. Neglecting air resistance, determine the momentum acting on the ball
So i did the following and the answer was correct:
Vf=Vi + 2ad
Vf = 0m/s + 2(-9.81m/s)(4.0m)
i solved for Vf and got 8.858893836m/s down
then solved for momentum
p = (0.06kh)(8.858893836m/s down )
p = 5.31x10^-1 kgm/s down
Now i can't do part B
B) The ball in part A bounces to a height of 3.0 m. if the collision with the floor took 0.024s, determine the normal force acting on the ball.
So i attempted it and this is what i did
F = MΔV/ΔT
F = (0.06kh)(8.858893836m/s down - 0m/s) / 0.024s
F = 22.15N this is the net force right?
So i now tried solving for the normal force knowing that gravity and normal force were acting on the ball so i did
Fnet = Fn - Fg
22.15N = Fn - mg
22.15N = Fn - (-0.5886N)
22.15N-0.5886N = Fn
so Fn = 21.56N
But the answer sheet i have says the answer is 42N so I am so lost