Damage from an earthquake is most severe when the
A) epicenter is close to the surface.
B) surface material is composed of unconsolidated sediments.
C) buildings and structures are poorly constructed.
D) all of the above
Answer: D
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Equilibrium: A 40-kg uniform ladder that is 5.0 m long is placed against a smooth wall at a height of h = 4.0 m, as shown in the figure. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction with the ladder is 0.40. An 80-kg bucket is suspended from the top rung of the ladder, just at the wall. What is the magnitude of the force that the ladder exerts on the wall?
A. 740 N B. 1300 N C. 980 N D. 900 N E. 1100 N
Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size. B) be moving away from us, with more distant ones moving faster. C) be made mostly of dark matter. D) rotate rapidly.
What is thought to be the cause of Io's volcanoes?
A) Jupiter's magnetosphere and its charged particles B) Jupiter's gravity and the heat it creates C) tidal stresses from both Jupiter and Europa D) solar radiation focused by Jupiter's gravity E) radioactive decay in Io's interior
A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the collision?
A) zero B) +3.0 m/s C) -2.0 m/s D) +2.5 m/s E) +5.0 m/s