A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the angular acceleration of the fan?
A)
0.86 rad/s2
B)
0.74 rad/s2
C)
0.37 rad/s2
D)
11.6 rad/s2
E)
1.16 rad/s2
B
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A car travels around an unbanked highway curve (radius 0.15 km) at a constant speed of 25 m/s. What is the magnitude of the resultant force acting on the driver, who weighs 0.80 kN?
a. 0.87 kN b. 0.34 kN c. 0.80 kN d. 0.00 kN e. 0.67 kN
Force on a Moving Charge: An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10-19 C)
A. 4.8 × 10-14 N B. 1.9 × 10-15 N C. 5 × 10-20 N D. 2.2 × 10-24 N E. 0 N
Jupiter's "striped" appearance is a result of
A) alternating bands of rising and falling air at different latitudes. B) alternating bands of liquid and gaseous material at different latitudes. C) changes in the atmospheric composition with latitude. D) changes in the strength of Jupiter's magnetic field with latitude.
Some people claim that the theory of evolution violates the second law of thermodynamics, since that theory holds that order develops out of disorder, corresponding to a decrease in entropy. This claim
A. if incorrect, would mean that the theory of evolution must be true. B. is incorrect; the second law says only that the total entropy in a closed system increases. C. is correct, thereby disproving the theory evolution. D. None of these choices are correct