About how big is an atom?
a. too small to measure
b. about a millionth of a meter across
c. about a billionth of a meter across
d. about a trillionth of a meter across
e. none of the above
e
RATIONALE: It's about a tenth of a billionth of a meter.
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Molecular Speeds: A sample of an ideal gas is heated and its Kelvin temperature doubles. If the root-mean-square speed of its molecules was originally v, what is the new root-mean-square speed?
A. 4v
B. 2v
C. v
D. v/
E. v/4
What is the resistance of 1.0 m of a solid cylindrical metal cable having a diameter of 0.40 inches and a resistivity of 1.68 × 10-8 ? ? m?
A) 0.00012 ? B) 0.00021 ? C) 0.0012 ? D) 0.0021 ?
One explanation of the dark sky Olbers's Paradox is that light can reach us only from objects in space out to a distance in light years _______ the age of the universe in years
a. less than b. greater than c. equal to d. less than or equal to e. greater than or equal to
Suppose you are facing a tall makeup mirror on a vertical wall. Fluorescent tubes framing the mirror carry a clockwise electric current. What is the direction of the field the current creates at a point on the wall outside the frame to the right?
1.left 2.right 3.horizontally toward you 4.horizontally away from you 5.no direction because the field has zero magnitude