Hubble's law is the major basis for the concept that the universe is
a. static.
b. evaporating.
c. contracting.
d. expanding.
d
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Super-earths are
A) planets that are most earthlike, likely to harbor life. B) planets that are a few times the mass of the Earth. C) planets that have earthlike masses, but orbit much closer to their star than the Earth does to the Sun. D) any rocky (or terrestrial) planet. E) Earth-mass planets that are much lower in density than the Earth, giving them larger radii.
One advantage of the Hubble Space Telescope over ground based ones is that
A) it can make better observations of the ozone layer. B) it can better focus X-ray images. C) its adaptive optics controls atmospheric blurring better. D) in orbit, it can operate close to its diffraction limit at visible wavelengths. E) it is larger than any Earth-based telescopes.
A 5.00 gram bullet has a velocity of 300 m/s. It strikes a block of wood and penetrates to a distance of 2.00 cm. The average force of the block of wood on the bullet is
A. 9,340 N. B. 11,250 N. C. 15,200 N. D. 19,500 N. E. 21,400 N.
A car travels counterclockwise around a flat circle of radius 0.25 km at a constant speed of 20 m/s. When the car is at point A as shown in the figure, what is the car's acceleration?
a.
1.6 m/s2, south
b.
Zero
c.
1.6 m/s2, east
d.
1.6 m/s2, north
e.
1.6 m/s2, west