Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 55P
To determine
The force experienced by the runner when moving in the same direction as that of the wind, when moving opposite to the direction of the wind and the difference between the average of the two cases with that of the force in the absence of the wind.
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6) A railroad car which has a mass 9216 kg is constrained to move along a horizontal
track under the action of a wind blowing in the direction of the track. The frictional
resistance to the car motion is 1/200 of its weight. The force exerted by wind is
P=kSu?, where S is the area of the backside of the railroad car, equals to 6 m², and
u is the velocity of the wind relative to car, k=0.12. The absolute velocity of the
wind is w=12 m/s. The initial velocity of the railroad car is 0. Determine:
a) the maximum velocity vmax of the railroad car;
b) the time T taken to reach this velocity;
c) the distance x, travelled by the railroad car before reaching a velocity of 3 m/s.
O Problem 3: A block with a mass of m = 25 kg rests on a frictionless surface and is subject
to two forces acting on it. The first force is directed in the negative x-direction with a magnitude of
E = 8.5 N. The second has a magnitude of F, = 23.75 N and acts on the body at an angle 0 = 15°
measured from horizontal, as shown.
F2
F
The drag force exerted on a car by air depends on a dimensionless drag coefficient, the density of air, the car velocity, and the frontal area of the car. That is, FD = function (CDrag, Afront, r, V). Based on unit considerations alone, obtain a relation for the drag force.
Chapter 4 Solutions
Physics Fundamentals
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