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categoryهندسة ميكانيكية
schoolبكالوريوس
event_available2026-07-13
السؤال
Transcribed Image Text:
Involving
ces, velocities, and times.
A new rear-wheel drive automobile design is being tested
and you have been asked to estimate its performance.
The car without wheels (i.e., the body) has a mass of
me 1550 kg. The wheels (including tires) have
diameter of 63.0 cm and each wheel weighs
mw 15.0 kg. The radius of gyration of the wheels
about their centers is k = 21.7 cm. Model the torque
output (which acts in the counterclockwise direction) to
each rear wheel as T(t) = 90.0 3/2 N m. Assume that
the wheels roll without slipping and neglect the air
resistance and any other frictional effects.
Find the time it will take for the car to reach v = 100 km/h from rest.
Express your answer to three significant figures in seconds.
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Ο ΑΣΦ Η vec
t = 1.28
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Part B - Force Exerted by the Brakes
After the car reaches 100 km/h the driver immediately steps on the brakes and comes to a stop in 2.85 s. The brakes are at a
distance 15.1 cm from the center of the wheel and the force they apply acts in the y direction. Assume for this problem that the
brakes apply an equal force to each wheel, that the torque to the rear wheels is zero and that the wheels continue to rotate until the
car stops. Calculate the magnitude of the force, Fi, exerted by the brakes on each wheel during this time.
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