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.
D
You might also like to view...
Semiconductors: In a good insulator, the highest energy band containing electrons, called the valence band, is
A. only partially filled. B. completely filled. C. completely empty.
Standing Waves on a String: A guitar string 0.65 m long has a tension of 61 N and a mass per unit length of 3.0 g/m.(a) What is the speed of waves on the string when it is plucked?(b) What is the string's fundamental frequency of vibration when plucked?(c) At what other frequencies will this string vibrate?
What will be an ideal response?
The Triassic is a(n)
a. epoch. b. era. c. eon. d. period.
Object A (mA = 1.0 kg) hangs at rest from an ideal string A connected to the ceiling. Object B (mB = 2.0 kg) hangs at rest from an ideal string B connected to object A. The tension on string A is
A. Twice the tension on string B
B. 1.5 times the tension on string B
C. Equal to the tension on string B
D. 
the tension on string B
E. Other (specify)