The exchange of mediating photons can produce
a. neither a repulsive nor an attractive force.
b. either a repulsive or an attractive force.
c. a repulsive force.
d. an attractive force.
b
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If H equals 70 km/s/Mpc, then a galaxy with a radial velocity of 2100 km/s has a distance of approximately
a. 2170 Mpc. b. 2030 Mpc. c. 30 Mpc. d. 0.03 Mpc. e. 147,000 Mpc.
Impulse: The graph in the figure shows the x component F of the net force that acts for 10 s on a 100-kg crate. What is the change in the momentum of the crate during the 10 s that this force acts?
A. -100 kg ? m/s B. -25 kg ? m/s C. 75 kg ? m/s D. -75 kg ? m/s E. 25 kg ? m/s
Which of the following statements is generally true for stars in the halo?
A) Halo stars all orbit the center of the galaxy in approximately the same plane. B) Halo stars always remain in the halo, never passing through the disk of the galaxy. C) All halo stars will end their main-sequence lives within the next 100 million years. D) Halo stars have a much smaller proportion of elements besides hydrogen and helium than our Sun. E) Halo stars come in a wide variety of ages.
A certain kind of lightbulb carries 0.5 amperes of current when connected to a 120 volt AC circuit. What is its power rating?
A. 75 W B. 240 W C. 100 W D. 60 W