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BlueWaaaazzzBerry
31.03.2020 •
Physics
If the motor exerts a constant force of 300 N on the cable, determine the speed of the 26-kg crate when it travels s = 10 m up the plane, starting from rest. The coefficient of kinetic friction between the crate and the plane is μk = 0.3.
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Ответ:
10.32m/s
Explanation:
F = ma
T -mg sinθ-f =ma
We can conclude that T = 300 newtons by taking a freebody of the cable. So we need to determine only the frictional force.
f(n) = 0
mgcosθ = N = 0
N = mgcosθ
T - mg sinθ - u mgcosθ = ma
a = T - mg (sinθ + u cosθ) / m
a = 5.32m/s^2
Use constant acceleration kinematics:
=![= \sqrt{2\times 5.32\times10} \\\\=10.32m/s](/tpl/images/0572/3735/1d14d.png)
Ответ:
One takes longer to slow down than the other because one has more mass(the train) compared to the bowling ball!