In their common rest frame, two stars are 90.0 light-years (ly) apart. If they are 12.0 ly apart as measured by the navigator in a spaceship traveling between them, how fast is the spaceship moving? Express your answer in terms of c
A) 0.991c
B) 0.986c
C) 0.980c
D) 0.972c
Answer: A
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As a basketball player starts to jump for a rebound, he begins to move upward faster and faster until he leaves the floor. During this time that he is in contact with the floor, the force of the floor on his shoes is:
a. bigger than his weight. b. equal in magnitude and opposite in direction to his weight. c. less than his weight. d. zero.
The primary winding of an electric train transformer has 400 turns and the secondary has 50 . If the input voltage is 120V(rms) what is the output voltage?
a. 15 V (rms) b. 30 V (rms) c. 60 V (rms) d. 2.4 V (rms) e. 960 V (rms)
Power: Which one of the following quantities is equivalent to 1 W?
A. 1 V/A B. 1 ? ? m C. 1 V ? A D. 1 V/? E. 1 A ? s
An astronaut on a strange new planet finds that she can jump up to a maximum height of 27. meters when her initial upward speed is 6.0 m/s. What is the magnitude of the acceleration of gravity on the planet?
What will be an ideal response?