A 200-g hockey puck is launched at an initial speed of 16 m/s up a metal ramp that is inclined at a 30° angle
The coefficients of static and kinetic friction between the hockey puck and the metal ramp are µs = 0.40 and µk = 0.30, respectively. What vertical height does the puck reach above its starting point?
A) 8.6 cm
B) 17 cm
C) 13 cm
D) 4.2 cm
A
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You push a heavy crate down a ramp at a constant velocity. Only four forces act on the crate. Which force does the greatest magnitude of work on the crate?
(a) The force of friction. (b) The force of gravity. (c) The normal force. (d) The force of you pushing. (e) The net force.
A car travels in an oval path as shown below
= 25 m/s, West, and 
= 20 m/s, North. The ratio of the magnitude of the centripetal acceleration at B to that at A, 
is:
?
a.
0.512
b.
0.64
c.
0.8
d.
1.25
e.
1.56
A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is (in dB)
A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3.
Solar power is used in many parts of the world for
A) heating water. B) generating electricity. C) both of these D) neither of these