By how many newtons does the weight of a 100-kg person decrease when he goes from sea level to mountain top at an altitude of 5000 m? The mean radius of the earth is 6.38 × 106 m
A) 2.6 N B) 1.5 N C) 3.6 N D) 9.8 N E) 0.60 N
B
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Faraday's Law: The area of a rectangular loop of wire is 3.6 × 10-3 m2. The loop is placed in a uniform magnetic field that changes steadily from 0.20 T to 1.4 T in 1.6 s. The plane of the loop is perpendicular to the direction of the magnetic field. What is the magnitude of the induced emf in that loop?
A. 2.8 × 10-3 V B. 2.7 × 10-3 V C. 0 V D. 1.8 × 10-3 V E. 3.0 × 10-3 V
A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
a. 10 m/s; 9.8 m/s2. b. 9.0 m/s; 9.8 m/s2. c. 9.0 m/s; 9.0 m/s2. d. 1.0 m/s; 9.0 m/s2. e. 1.0 m/s; 9.8 m/s2.
That quasars were at cosmological distances yet appeared like ordinary faint stars meant:
A) they were the brightest stars ever observed. B) they must be very large. C) they must contain many O and B type stars. D) they must be producing such large quantities of energy than even fusion could not explain their output. E) they must be very small, but bright due to gravitational lensing.
A particular motor can provide a maximum torque of 110 N ? m. Assuming that all of this torque is used to accelerate a solid, uniform, cylindrical flywheel of mass 10.0 kg and radius 3
00 m, how long will it take for the flywheel to accelerate from rest to A) 3.33 s B) 2.83 s C) 4.03 s D) 4.36 s