A person walks toward a plane mirror at 2.0 ft/s. She is approaching her image in the mirror at a speed of
A)
1.0 ft/s.
B)
3.0 ft/s.
C)
2.0 ft/s.
D)
4.0 ft/s.
E)
5.0 ft/s.
D
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In the context of binary pulsars, in Hercules X-1, _____
A) matter flows from a star into an accretion disk around a dead star, producing gamma rays B) a 6-solar-mass star and a neutron star orbit each other with a period of 28.7 days C) several low-energy processes go on simultaneously D) X-rays turn off when the neutron star is eclipsed behind the normal star
Kirchhoff's rules are the junction rule and the loop rule. Which of the following statements is true?
a. Both rules are based on the conservation of charge. b. Both rules are based on the conservation of energy. c. The junction rule is based on the conservation of charge, and the loop rule is based on the conservation of energy. d. The junction rule is based on the conservation of energy, and the loop rule is based on the conservation of charge.
Although it is difficult to tell from our vantage point inside the galaxy, astronomers suspect that the Milky Way is a barred spiral
Indicate whether the statement is true or false
The speed of light is
A) 300 km/s. B) 3 million km/s. C) 3 km/s. D) 3,000 km/s. E) None of the above.