A space probe has an 24.7-m length when measured at rest. What length does an observer at rest measure when the probe is going by at a speed of 0.860c?
a. 25.2 m
c. 9.19 m
b. 6.43 m
d. 12.6 m
D
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A 1000-kg car is moving at 30.0 m/s around a horizontal curve whose radius is 100 m. What is the magnitude of the frictional force required to keep the car from sliding?
A) 9000 N B) 9810 N C) 300 N D) 900 N E) 3000 N
When a load is placed on the middle of a horizontal beam supported at each end, the top part of the beam undergoes
A) tension. B) compression. C) either of these D) none of these
The period and the frequency of a sound wave are
A. multiples of each other-period is 2? times the frequency. B. independent of each other. C. reciprocals of each other. D. None of these choices are correct
A particle (charge = 5.0 ?C) is released from rest at a point x = 10 cm. If a 5.0-?C charge is held fixed at the origin, what is the kinetic energy of the particle after it has moved 90 cm?
a. 1.6 J b. 2.0 J c. 2.4 J d. 1.2 J e. 1.8 J