The period of the Moon's rotation on its axis is
A. much shorter than its revolution around the Earth.
B. much longer than its revolution around the Earth.
C. the same as its revolution around the Earth.
D. longer or shorter depending on what part of the year we are in.
the same as its revolution around the Earth.
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You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. When you increase the plate separation, what happens to the value of ?V?
1.It increases. 2.It decreases. 3.It stays the same.
Young's Modulus: A 50-kg load is suspended from a steel wire of diameter 1.0 mm and length 11.2 m. By what distance will the wire stretch? Young's modulus for steel is 2.0 × 1011 Pa.
A. 1.5 cm B. 2.5 cm C. 3.5 cm D. 4.5 cm
Complete the following sentences that describe evidence found in the K-T boundary layer. Drag words at the left to the correct blanks in the sentences at the right.
A. The presence of soot suggests that there were world-wide forest fires at the time this layer formed. B. The presence of solidfied rock "droplets" is thought to indicate that rock splashed upward by an impact was molten as it fell back down from the sky. C. The presence of shocked quartz suggests an impact because these mineral grains form only under high-pressure conditions. D. The unusually high abundance of iridium in this layer suggests that this material came from the impact of an asteroid (or comet). E. All of the above.
When an unstable Arsenic nucleus undergoes alpha decay, the nucleus formed is that of
a. Arsenic. b. Bromine. c. Germanium. d. Gallium. e. Selenium.