- #1
shin777
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1. What force is needed to pull a 10kg box across a floor that has a coefficient of friction of .34?
my answer
F = W * f * x
F = .34(10)(9.8) = 33N
2. The carts of a roller coaster are traveling 5 m/s over the top of the first hill. If there is no energy loss due to friction and the hill is 50m high, what speed will the carts have at the bottom of the hill?
my answer
(1/2)(Vi^2 + gh) = (1/2)(Vf^2)
(1/2)[(5^2)+9.8(50)] = (1/2)(Vf^2)
Vf = 31 m/s
do they look ok? if I am wrong please correct me. :(
my answer
F = W * f * x
F = .34(10)(9.8) = 33N
2. The carts of a roller coaster are traveling 5 m/s over the top of the first hill. If there is no energy loss due to friction and the hill is 50m high, what speed will the carts have at the bottom of the hill?
my answer
(1/2)(Vi^2 + gh) = (1/2)(Vf^2)
(1/2)[(5^2)+9.8(50)] = (1/2)(Vf^2)
Vf = 31 m/s
do they look ok? if I am wrong please correct me. :(