2015年Physics Bowl物理碗真题PDF下载
1.Which one of the following choices correctly represents a length of 3.00 mm?
(A) 3.00 × 10−6 m
(B) 3.00 × 10−3 m
(C) 3.00 × 10−2 m
(D) 3.00 × 103 m
(E) 3.00 × 106 m
2.A box uniformly slides 7.50 m to rest across a flat surface in a time of 12.0 s. What was the initia speed of the box when it started its slide?
(A) 0.313 m/s (B) 0.625 m/s (C) 1.25 m/s (D) 2.50 m/s (E) 5.00 m/s
3.Which one of the following quantities is not a vector quantity?
(A) Average speed
(B) Average velocity
(C) Linear momentum
(D) Acceleration
(E) Average force
4.A standing wave on a string is produced. Which one of the following choices best describes the location on the string at which maximum constructive interference occurs?
(A) node (B) antinode (C) harmonic (D) overtone (E) amplitude
5.An object initially is moving upward while in free fall. Which one of the following choices best represents the direction of the object’s acceleration during its flight?
6.A car travels at 20.0 miles/hr Which one of the following choices best represents the speed of the car in SI units of m/s?
(A) 533 m/s (B) 45.0 m/s (C) 20.0 m/s (D) 8.9 m/s (E) 0.75 m/s
7.An object moves clockwise with constant speed around the vertical circle shown. Which arrow best indicates the direction of the object’s instantaneous acceleration at the point labeled
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