As your room gets messier day by day, entropy is
A) increasing.
B) decreasing.
C) hanging steady.
D) none of the above
Answer: A
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The hydrogen in our solar system was created from subatomic particles in ______
a. the Earth b. our sun c. Jupiter d. the Big Bang e. supernovas
Swimmers at a water park have a choice of two frictionless water slides as shown in the figure
Although both slides drop over the same height, h, slide 1 is straight while slide 2 is curved, dropping quickly at first and then leveling out. How does the speed v1 of a swimmer reaching the end of slide 1 compares with v2, the speed of a swimmer reaching the end of slide 2? A) v1 > v2 B) v1 < v2 C) v1 = v2 D) No simple relationship exists between v1 and v2 because we do not know the curvature of slide 2.
A point on the rim of a 0.25-m-radius fan blade has centripetal acceleration of 0.20 m/s2 . Find the centripetal acceleration of a point 0.05 m from the center of the same wheel
a. 0.01 m/s2 b. 0.02 m/s2 c. 0.04 m/s2 d. 0.08 m/s2
A truck moves 70 m west, then moves 120 m east, and finally moves west again a distance of 90 m. If east is chosen as the positive direction, what is the truck's resultant displacement?
a. 40 m c. 280 m b. - 40 m d. -280 m