The shortest-daylight day for people in the Southern Hemisphere at latitudes greater than 30°S occurs at the
a. summer solstice.
b. vernal equinox.
c. winter solstice.
d. autumnal equinox.
a
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How do we know that halo stars are older, on average, than disk stars?
A) Halo stars orbit in random directions but disk stars have more ordered orbits. B) There are no blue halo stars. C) There are no red disk stars. D) Theories of galaxy formation tell us that the halo formed earlier than the disk. E) We see evidence for new stars forming in the disk today.
Torque: A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pivot point produced by this force?
A. 7.6 N ? m B. 10.7 N ? m C. 12.0 N ? m D. 9.7 N ? m
When an unstable nucleus decays by emitting an alpha particle, the atomic number of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.45 kg and time of contact with the football is 0.035 s, what is the force exerted on the foot?
a. 14 N b. 13 N c. 390 N d. 860 N e. 900 N