The figure shows two packages that start sliding down a 20° ramp from rest a distance along the ramp from the bottom
Package A has a mass of 5.0 kg and a coefficient of kinetic friction 0.20 between it and the ramp. Package B has a mass of 10 kg and a coefficient of kinetic friction 0.15 between it and the ramp. How long does it take package A to reach the bottom?
A) 2.7 s
B) 3.0 s
C) 3.2 s
D) 3.5 s
Answer: A
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(b) How much time elapses before it returns to its starting point?
In which of the following ways are Pluto and Eris more like comets than like any of the terrestrial or jovian planets?
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Normal atmospheric pressure is about __________
Fill in the blank(s) with correct word
The position of a particle moving along the y axis has a position given by
?
?
Is there any time interval during which the particle is not moving?
A. Yes, from 0.60 s to 1.00 s. B. Yes, from 0.795 s to 0.805 s. C. Yes, at the time t = 0.80 s. D. No, the velocity is never zero. E. No, an instant is not the same as a time interval.