If you carry a heavy bag of groceries and bang your hand against the wall, the concept that best explains why your hand hurts is
A) inertia.
B) gravity.
C) resistance.
D) none of the above
Answer: A
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Density: A plastic block of dimensions 2.00 cm × 3.00 cm × 4.00 cm has a mass of 30.0 g. What is its density?
A. 0.80 g/cm3 B. 1.20 g/cm3 C. 1.25 g/cm3 D. 1.60 g/cm3
A car travels in an oval path as shown below. 
= 25 m/s, West, and 
= 20 m/s, North. The ratio of the magnitude of the centripetal acceleration at B to that at A,
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?
?
A. 0.512
B. 0.64
C. 0.8
D. 1.25
E. 1.56
A 3.0-cm tall statue is 48 cm in front of a convex lens having a focal length of magnitude 20 cm
(a) Is the image of the statue real or virtual? (b) How far is the image from the lens? (c) Is the image upright or inverted? (d) How tall is the image?
Consider the four quantum numbers of an electron in an atom, n, l, ml, and ms. The energy of an electron in an isolated atom depends on
A) l, ml, and ms only. B) n only. C) n and l only. D) n, l, and ml only. E) all four quantum numbers.