Which best describes Mercury's plains?
a. heavily impacted with craters and large rays
b. solidified lava flows that are a uniform gray color
c. a geologically active surface of molten lava
d. solidified lava flows rich in dark basalts
e. a rich layer of soil containing iron and silicate
b
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A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 ?. What is the average power loss?
a. 225 W b. 450 W c. 980 W d. 1.12 kW e. 900 W
Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average running speed is
A) 1/2 yard/second. B) 5 yards/second. C) 50 yards/second. D) not enough information
This large fuzzy blob in the center of this image is the central dominant galaxy of the cluster that surrounds it. The arrow points to several large clumps of stars near the center of the galaxy. What do those clumps probably represent?
A) Each clump was probably once the center of an individual galaxy. B) The clumps are regions of extremely strong x-ray emission. C) Each clump is the endpoint of one of the galaxy's spiral arms. D) The clumps are globular clusters orbiting the center of the galaxy.
A 35-N bucket of water is lifted vertically 3.0 m and then returned to its original position. How much work did the gravitational force exerted by Earth on the object do on the bucket during this process?
A) 180 J B) 90 J C) 45 J D) 0 J E) 900 J