An observer measures the North Star (Polaris) at an altitude of 30°. The observer's latitude is
a. 40°N.
b. none of these.
c. 60°N.
d. 30°N.
d
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According to the nebular theory, what are asteroids and comets?
A) They are the shattered remains of collisions between planets. B) They are the shattered remains of collisions between moons. C) They are leftover planetesimals that never accreted into planets. D) They are chunks of rock or ice that condensed long after the planets and moons had formed. E) They are chunks of rock or ice that were expelled from planets by volcanoes.
The equilibrium rule ?F = 0 applies to
A) objects or systems at rest. B) objects or systems in uniform motion in a straight line. C) both of the above D) neither of the above
New material filling a mold forms a ______________ of the original shell or bone
a. cast b. mold c. hole d. groove
A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?
a. 27 N b. 15 N c. 13 N d. 17 N e. 19 N