A standing wave can occur when
A) two waves overlap.
B) a wave reflects upon itself.
C) the speed of the wave is zero or near zero.
D) the amplitude of a wave exceeds its wavelength.
Answer: B
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Suppose the star Sirius were moved to a distance 7 times closer to Earth than it is now. How would its parallax angle change?
A) It would stay the same. B) It would get smaller. C) It would get larger.
An ice skater has a moment of inertia of 5.0 kg ? m2 when her arms are outstretched, and at this time she is spinning at 3.0 rev/s. If she pulls in her arms and decreases her moment of inertia to 2.0 kg ? m2, how fast will she be spinning?
A) 7.5 rev/s B) 3.3 rev/s C) 10 rev/s D) 2.0 rev/s
The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?
?
?
a.
1.8 m/s2
b.
2.6 m/s2
c.
1.4 m/s2
d.
2.2 m/s2
e.
3.7 m/s2
The Milky Way is
A) a spiral galaxy. B) an elliptical galaxy. C) an irregular galaxy. D) a galaxy in the making. E) the remains of a galaxy that has run its life course.