All of the above are true. Which one explains why we see phases of the Moon.
a) As the Moon orbits the Earth, sometimes its shadow falls on the surface of the earth
b) as the Moon orbits the Earth, it sometimes enter into the Earths shadow
c)As the Moon orbits the Earth, it always keeps the same face pointing toward Earth
c)As the Moon orbits the Earth, it always keeps the same face pointing toward Earth
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The footprints left on the moon by the Apollo astronauts will likely last for
A) millions of years. B) no time; they were quickly erased by micrometeorites. C) the remaining existence of the Moon. D) a few decades.
The electromagnetic radiation that causes tanning:
a. rarely passes through glass windows. b. is absorbed by ozone. c. can produce cancer. d. is all of the above.
A solid sphere and a solid cylinder, both uniform and of the same mass and radius, roll without slipping at the same forward speed. It is correct to say that the total kinetic energy of the solid sphere is
A) more than the total kinetic energy of the cylinder. B) less than the total kinetic energy of the cylinder. C) equal to the total kinetic energy of the cylinder.
Nitrogen gas is used to harden iron by diffusing the nitrogen into BCC iron at 700°C. If the surface concentration of nitrogen is maintained at 0.1 weight percent, what is the expected concentration of nitrogen 1 mm from the surface after 10 hours? You can assume that at small values of z, erf(z) is approximately equal to z.
What will be an ideal response?