Car A is traveling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind car B when the driver of car A accelerates his car with an acceleration of 2.40 m/s2. How long does it take car A to overtake car B?
A) 5.50 s
B) 12.6 s
C) 19.0 s
D) 316 s
E) Car A never overtakes car B.
C
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A particle moves along the x axis. The slope of the arrow representing an object’s four-momentum on an energy–momentum diagram is equal to
A. The particle’s speed. B. The particle’s x-velocity. C. The inverse of the particle’s speed. D. The inverse of the particle’s x-velocity. E. The particle’s energy.
A ruby laser beam (? = 694.3 nm) is sent outwards from a 2.7-m diameter telescope to the Moon, 384,000 km away. What is the radius of the big red spot on the Moon?
A. 500 m B. 250 m C. 120 m D. 1.0 km E. 2.7 km
Suppose the gravitational potential energy for a mass at an altitude of one Earth radius is PE1 and at two Earth radii is PE2 . How do the absolute values of these potential energies compare?
a. |PE1| = 2|PE2| b. |PE1| = 4|PE2| c. |PE1| < 2|PE2| d. |PE1| > 2|PE2| but is not equal to 4|PE2|
When sodium and chlorine react to form sodium chloride, an ionic compound,
a. each sodium atom loses two electrons. b. each sodium atom loses one electron. c. each chlorine atom loses one electron. d. each chlorine atom loses two electrons.