Contrast the space motion of neutron stars with normal stars. Explain
What will be an ideal response?
In general, neutron stars are moving much faster, perhaps given extra kinetic energy by the violence of the supernova event.
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At which lunar phase(s) are tides most pronounced (e.g., the highest high tides)?
A) first quarter B) new Moon C) full Moon D) both new and full Moons E) both first and third quarters
A 3000-N bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
A) 30 N. B) 300 N. C) 3000 N. D) more than 3000 N.
Which of the following is not a wave?
A) light B) water flowing down a river C) ripples on the surface of a pond D) All of these are waves. E) None of these are waves.
Two circus clowns (each having a mass of 50 kg) swing on two flying trapezes (negligible mass, length 25 m) shown in the figure. At the peak of the swing, one grabs the other, and the two swing back to one platform. The time for the forward and return motion is
?
?
a.
10 s.
b.
50 s.
c.
15 s.
d.
20 s.
e.
25 s.