A block slides down a frictionless inclined ramp and experiences no significant air resistance. If the ramp angle is 17
0° above the horizontal and the length of the surface of the ramp is 20m find the speed of the block as it reaches the bottom of the ramp, assuming it started sliding from rest at the top.
A) 7.57 m/s B) 19.6 m/s C) 114 m/s D) 10.7 m/s
D
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The system shown is released from rest and moves 50 cm in 1.0 s. What is the value of M? All surfaces are frictionless.
A. 0.42 kg B. 0.34 kg C. 0.50 kg D. 0.59 kg E. 0.68 kg
If a = 30 cm, b = 20 cm, q = +2.0 nC, and Q = ?3.0 nC in the figure, what is the potential difference VA?VB?
A. +60 V B. +72 V C. +84 V D. +96 V E. +48 V
Suppose we could magically triple the distance between Earth and the moon. This would cause the gravitational force by Earth on the moon to be
A) increased to three times its former value. B) be unchanged. C) reduced to 1/4 of its former value. D) reduced to 1/3 of its former value. E) reduced to 1/9 of its former value.
What can cause a galactic fountain?
A) winds and jets from newly-formed protostars B) a supernova occurring in the halo C) multiple supernovae occurring together D) the combined effect of spiral density waves E) molecular clouds falling towards the galactic center