Burl and Paul on a sign-painting scaffold are in equilibrium, which means that the net upward supporting force of the vertical ropes is
A) equal to their weights.
B) greater than their weights.
C) equal and opposite to the combined weights of Burl, Paul, and the scaffold.
D) none of the above
Answer: C
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Suppose you lived on the Moon. Which of the following would be true?
A) Your weight would be less than your weight on Earth, but your mass would be the same as it is on Earth. B) Both your weight and your mass would be less than they are on Earth. C) Your mass would be less than your mass on Earth, but your weight would be the same as it is on Earth. D) Both your weight and your mass would be the same as they are on Earth.
Describe two sources from which minerals can crystallize
What will be an ideal response?
The evidence for recent geological activity on Pluto came as a surprise to most scientists, because they did not expect Pluto to retain enough heat to drive such activity. Which of the following best explains why Pluto is so geologically active despite its small size?
A. The activity is driven by tidal heating caused by Pluto’s moons. B. Pluto’s tall mountains built of water ice must be unstable, and when they collapse they can cause geological activity C. The activity is driven by heat from the many impacts that occur in the Kuiper belt. D. The activity involves nitrogen ice, so Pluto does not need much heat to cause this ice to undergo change. E. The activity is driven by the heat of a subsurface ocean.
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the magnetic field created by that current at the center of the mirror?
1.left 2.right 3.horizontally toward you 4.horizontally away from you 5.no direction because the field has zero magnitude