The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm? k = 2.0 kN/m
A. 3.7 m/s
B. 4.4 m/s
C. 4.9 m/s
D. 5.4 m/s
E. 14 m/s
Answer: A
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This figure shows frames from a computer simulation of star formation, starting at the left with a large molecular cloud measuring more than a light-year across. What is happening as time passes (from left to right)?
A) The cloud is fragmenting into smaller pieces that will form stars. B) The cloud is developing hot spots that shine more brightly within it. C) Magnetic fields are forcing the gas to align in intricate ways along twisted magnetic field lines. D) The cloud has been hit by a shock wave from a nearby stellar explosion, which causes the gas to move violently around.
Mercury's smooth plains are most similar to the Moon's:
A) maria. B) highlands. C) craters. D) mountain ranges.
The upper boundary of the zone of saturation is called the ______________
Fill in the blank(s) with correct word
The planet COROT-14b is only slightly larger than Jupiter, but is several times as massive. Which is the most plausible explanation for its similar size to Jupiter?
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