What is the relativistic momentum of a 0.456-kg rest mass moving at 1.20 × 108 m/s?
A) 5.47 × 107 kg?m/s
B) 5.57 × 107 kg?m/s
C) 5.67 × 107 kg?m/s
D) 5.87 × 107 kg?m/s
E) 5.97 × 107 kg?m/s
E
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For a pair of Polaroids with axes at 45 degrees to each other
A) light will not pass. B) light that passes is dimmer than for a parallel orientation. C) another Polaroid is necessary for any light to pass.
Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is
A) twice as much as the 25-kg sack. B) half as much as the 25-kg sack. C) the same. D) need more information
Which statement about the first quarter moon is FALSE?
A) It rises about noon. B) From the Earth, it appears 25% sunlit. C) It is the half moon of the evening sky. D) It is highest in the sky at sunset. E) It occurs about a week after new moon.
Raising the current through a resistor from 8.50 A to 11.3 A increases the power by
A. 33.0%. B. 77.0%. C. 113%. D. 157%. E. 0% (no change).