A space station of diameter 80 m is turning about its axis at a constant rate. If the acceleration of the outer rim of the station is 2.5 m/s2, what is the period of revolution of the space station?
A. 22 s
B. 19 s
C. 25 s
D. 28 s
E. 40 s
Answer: C
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The coma around the nucleus of a comet can be 10 times the size of Earth.
Answer the following statement true (T) or false (F)
If the displacement of an object is given in SI units by ?x = ?3t + 4t 2, at t = 2 s its velocity and acceleration are, respectively:
a. positive, positive. b. positive, negative. c. negative, negative. d. negative, positive.
Slanting Surfaces With Friction: A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N that is parallel to the slope. The coefficient of kinetic friction between the block and the slope is 0.200. What is the acceleration of the block?
A. 0.528 m/s2 B. 0.158 m/s2 C. 0.412 m/s2 D. 0.983 m/s2 E. 0.260 m/s2
A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. If the object is in contact with the wall for 2.0 ms, what is the magnitude of the average force on the object by the wall?
a. 9.8 kN b. 8.4 kN c. 7.7 kN d. 9.1 kN e. 1.2 kN