The apparent amount of time it takes for Earth to complete a rotation on its axis is called a
a. meridian day.
b. 24-hour day.
c. sidereal day.
d. mean solar day.
e. solar day.
e
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The design of a part that operates at room temperature requires a material that is of low density, corrosion resistant, and low cost. The stresses on the part are very low. Which of the following materials might be appropriate?
(a) PE (b) A magnesium alloy (c) Alumina ceramic (d) PEEK
Why don't most of the particles that make meteors actually reach the surface of Earth?
A) They are too small and burn up in the atmosphere. B) They reflect off the atmosphere and return to space. C) They are too small and are slowed to a stop in the atmosphere. D) They are deflected by the solar wind. E) They are deflected by the gravity of the Moon.
When Percival Lowell insisted on the existence of Martian canals, even though his observations were discredited by other scientists, he exhibited
A) objectivity B) stupidity C) insanity D) personal bias
Although stars much more luminous than our Sun have wider habitable zones, planets around them are unlikely to have developed life because high luminosity stars
A) have extremely short lifetimes of the order of millions of years B) are not expected to form rocky, terrestrial planets C) emit very high levels of short wavelength radiation D) are very unstable