Hot steam that issues from a pressure cooker expands and
A) increases in temperature.
B) can cause severe burns.
C) cools.
D) all of the above
E) none of the above
Answer: C
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A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation 5 m above ground level. The ball lands 20 m downrange. The player's pitching speed is about
A) 5 m/s. B) 10 m/s. C) 20 m/s. D) 25 m/s. E) none of the above
A fossil is found in a layer of strata below one layer dated at 8 million years. From this we can deduce the age of the fossil to be
A) between 7 and 8 million years old B) we can tell nothing about the fossil's age from this data C) older than 8 million years D) younger than 7 million years
An huge bear and a leaf fall from a tree through the air to the ground below. The force of air resistance is greater on the
A) bear. B) leaf. C) same on each
A beam of light traveling in air strikes a glass slab at an angle of incidence less than 90°. After entering the glass slab, what does the beam of light do? (There could be more than one correct choice.)
A) I follows the same path as before it struck the glass. B) It follows the normal to the glass slab. C) It bends away from the normal at the point of contact. D) It bends closer to the normal at the point of contact. E) It slows down.