The angular size of an object depends on which two quantities?
A) The object's actual size and its mass
B) The object's distance from us and its brightness
C) The object's actual size and its distance from us
D) The object's brightness and its mass
C
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An iron rod becomes magnetic when
A) opposite ions accumulate at each end. B) its atoms are aligned. C) the net spins of many internal electrons are aligned. D) its electrons stop moving and point in the same direction.
A box slides up an incline with an angle of elevation ?. When the box reaches its maximum distance up the incline it stops and does not slide down the incline due to friction. What is the minimum value of the coefficient of static friction for this to occur?
a. ?s = tan? b. ?s = sin? c. ?s = cos? d. ?s = 1
The Sun's energy comes from ________.
A. its rotation slowing down B. the conversion of mass into energy C. the release of magnetic energy D. meteors and asteroids striking its surface
In our part of the universe, antimatter is
A) non-existent. B) plentiful. C) short-lived. D) long-lived.