2013年Physics Bowl物理碗真题PDF下载
The following 2 questions deal with the following information:
A small object is released from rest and reaches the ground in a time of 2.50 s. Neglect air resistance.
1.Red light from a laser is noted to have a wavelength of 632.8 nanometers. Which one of the following choices best represents the meaning of the prefix nano?
(A) 1 × 10−3 (B) 1 × 10−6 (C) 1 × 10−9 (D) 1 × 10−12 (E) 1 × 10−15
2.With what speed does the object reach the ground?
(A) 31.3 m/s (B) 25.0 m/s (C) 12.5 m/s (D) 10.0 m/s (E) 2.50 m/s
3.From what height above the ground was the object released?
(A) 6.25 m (B) 12.5 m (C) 25.0 m (D) 31.3 (E) 62.5 m
4.A scientist calculated a quantity that was equal to one light-year. Which one of the following choices represents the type of quantity that the scientist calculated?
(A) Time (B) Mass (C) Speed (D) Force (E) Distance
5.At an instant of time
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