The ice bear problem plese. In the movie The Silence of the Lambs, agents look i
ID: 1356770 • Letter: T
Question
The ice bear problem plese.
In the movie The Silence of the Lambs, agents look into an elevator shaft to see a body lying on top of an elevator car. To determine whether the body is deceased, an officer fires a bullet into its leg. If the bullet has a muss of 19.0 g and a velocity of 4.95 Times 10^2 m/s, use the Work-Energy Theorem to determine the average force the leg exerts on the bullet. Assume that the bullet penetrates the leg and comes to rest over a distance of 6.50 cm. Ice Bear pulls on a sled having a mass of 9.30 kg with the cord having an angle of 20 degree relative to the ground. Friction means that the sled moves at a constant velocity along the surface. If the cord has a tension of 19.5 N and the sled moves a distance of 7.50 m, find (a) the work done by Ice Bear on the sled, (b) the work done by friction on the sled, and (c) the coefficient of kinetic friction.Explanation / Answer
Here ,
mass of sled , m =9.3 Kg
distance , d = 7.5 m
a) work dobe by the ice bear
W = T * d * cos(theta)
W = 19.5 * 7.5 * cos(20)
W = 137.43 J
the work done by the bear sled is 137.43 J
b)
as the sled is moving with constant velocity
work done by friction = - work done by bear sled
work done by friction = -137.43 J
the work done by friction is -137.43 J
c)
frictional force, f = 137.43/7.5
f = 18.32 N
let the coeffcient of friction is u
u * (9.3 * 9.8 - 19.5 * sin(20)) = 18.32
u = 0.216
the coefficient of friction is 0.216
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