Which of the following sound frequencies lie(s) in the audible range?
a. 23 Hz
b. 9 kHz
c. 3100 Hz
d. All of these
d
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Three charged particles are positioned in the xy plane: a 50-nC charge at y = 6 m on the y axis, a ?80-nC charge at x = ?4 m on the x axis, and a 70-nc charge at y = ?6 m on the y axis. What is the electric potential (relative to a zero at infinity) at the point x = 8 m on the x axis?
A. +81 V B. +48 V C. +5.8 V D. ?72 V E. ?18 V
Which of the following particles has not yet been detected (even though most scientists consider its existence to be likely)?
a. The pion. b. The muon. c. The graviton. d. Intermediate vector bosons. e. The positron.
A sprinter moving at 10 m/s slows down at a rate of 1.4 m/s2. How fast is the runner moving after 4 seconds?
A. 5.8 m/s B. 15.6 m/s C. 0 m/s D. 4.4 m/s
You and Al are both floating freely in your spaceships. Suppose that Al is moving away from you at 85 km/hr. You throw a ball in his direction at a speed of 75 km/hr. According to Al, which of the following is going on?
A) He sees you moving toward him at 85 km/hr and the ball moving toward him at 75 km/hr. B) He sees you moving away from him at 85 km/hr and the ball moving toward him at 10 km/hr. C) He agrees that he is moving at 85 km/hr and the ball is moving at 75 km/hr while you are standing still. D) He sees you moving away from him at 85 km/hr and the ball moving away from him at 10 km/hr.