Compared to clocks in a stationary reference frame, clocks in a moving reference frame run
A) slower.
B) faster.
C) at the same rate.
Answer: A
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The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang. Which hypothetical observation below (these are not real observations) would call our current theory into question?
A) the discovery of a galaxy with 27% helium rather than the 25% that theory tells us was produced in the Big Bang B) the discovery of a galaxy with a helium abundance of only 10% by mass C) the discovery of a star-like object made entirely of carbon and oxygen D) the discovery of a planet that with no helium in its atmosphere
The absolute temperature of an ideal gas is directly proportional to which of the following quantities?
A) the average speed of its molecules B) the average momentum of its molecules C) the average kinetic energy of its molecules D) the mass of its molecules E) It is proportional to all of the above quantities.
A 2-kg ball is moving with a constant speed of 5 m/s in a horizontal circle whose radius is 50 cm. What is the magnitude of the net force on the ball?
A) 0 N B) 20 N C) 40 N D) 50 N E) 100 N
Coulomb's Law: Two electrons are 20.0 mm apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other? (e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 109 N ? m2/C2)
A. 5.8 × 10-25 N B. 2.3 × 1010 N C. 2.3 N D. 5.8 × 10-27 N