2018年Physics Bowl物理碗真题PDF下载
1.A quick Google search reveals that your phone operates at a frequency of 850 × 106 Hz. Which of the following choices best represents this frequency using metric prefixes?
(A) 850 μHz (B) 850 mHz (C) 850 kHz (D) 850 MHz (E) 850 GHz
2.A standard metal electroscope is positively charged. A person that is grounded (neutral charge) then touches the top portion of the electroscope with their finger. Which one of the following choices most correctly explains what happens when the finger touches the electroscope?
(A) The leaves of the electroscope come back together because excess protons conduct to the finger from the electroscope.
(B) The leaves of the electroscope come back together because electrons conduct to the electroscope from the finger.
(C) The leaves remain where they are as nothing occurs.
(D) The leaves of the electroscope move apart as electrons conduct from the electroscope to the finger.
(E) The leaves of the electroscope move apart as protons conduct from the finger to the electroscope.
3.Which of the following is NOT a vector quantity?
(A) Acceleration
(B) Average velocity
(C) Linear momentum
(D) Potential energy
(E) Force
4.A ball is thrown vertically downward with an initial speed of 12.0 m/s from a height of 10.0 m above the ground. Ignoring air resistance, what is the speed of the ball when it reaches the ground?
(A) 18.5 m/s (B) 14.6 m/s (C) 14.0 m/s (D) 12.8 m/s (E) 12.0 m/s
5.A particle travels at a constant speed around a circular path of radius
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