A 1500-kg car accelerates from 0 to 25 m/s in 7.0 s. What is the average power delivered by the engine? (1 hp = 746 W)
A)
50 hp
B)
60 hp
C)
70 hp
D)
80 hp
E)
90 hp
E
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Pulsars are thought to be ________
A) unstable high-mass stars B) accreting black holes C) rapidly rotating neutron stars D) accreting white dwarfs
A soccer ball is released from rest at the top of a grassy incline. After 6.4 seconds the ball has rolled 91 m with constant acceleration, and 1.0 s later it reaches the bottom of the incline
(a) What was the ball's acceleration? (b) How long was the incline?
Estimation: A reasonable estimate for the mass of a typical female college student is
A. 20 kg. B. 50 kg. C. 150 kg. D. 200 kg.
Sound waves in the interstellar medium
A) cannot exist at all. B) travel so slowly that they are undetectable. C) cannot be heard by human ears, but do indeed travel through the gas. D) travel extremely quickly and are therefore very loud.