Which of the following can be determined by using the Doppler effect? I. the speed at which a star is moving away from an observer II. the transverse velocity of a star III. the radial velocity of a star IV. the speed at which a car is traveling toward an observer
a. I & IV
b. II & III
c. II & IV
d. I & III
e. I, III, & IV
e
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Weight and g: The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.661 m/s2 B. 9.81 m/s2 C. 1.62 m/s2 D. 3.72 m/s2 E. 0.140 m/s2
Two twin sisters, Gwen and Jackie, are both 20 years old in the year 2050. Jackie takes off on a round-trip to Vega, 25 light-years away. She travels at an average speed close to the speed of light, say, 0.9999c. According to Gwen back on Earth, about how long does it take Jackie to reach Vega?
A) about 25 years B) about a month C) about 10 years D) about 100 years
A sound source departs from a stationary observer. The frequency heard by the observer is
A) higher than the source. B) lower than the source. C) the same as that of the source. D) equal to zero. E) impossible to predict.
When a 125-kg piece of equipment is hung from a steel wire of diameter 6.00 mm, it stretches the wire by 4.00 mm. If instead the wire had a diameter of 3.00 mm, but all else were the same, by what distance would the same equipment stretch the wire?
A) 1.00 mm B) 2.00 mm C) 16.0 mm D) 8.00 mm E) 4.00 mm