An object accelerates when it experiences a non-zero net force. Which of the following statements is always true?
1.The object moves in the direction of the net force.
2.The object's velocity increases.
3.The object's velocity is in the same direction as its acceleration.
4.The object's acceleration is in the same direction as the net force that acts upon it.
4
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A film of index of refraction n1 coats a surface with index of refraction n2. When n1>n2, the condition for constructive interference for reflected monochromatic light of wavelength ? in air is
A.
.B.
.C.
.D.
.E.
.What characteristics of a sound wave are related to the "pitch" of a musical note? (There could be more than one correct choice.)
A) amplitude B) wavelength C) frequency D) period
A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
A) 6 km/h. B) 8 km/h. C) 10 km/h. D) 20 km/h.
The making of abundant iron nuclei is typical of:
A) planetary nebula ejection. B) the helium flash. C) all novae. D) type I supernovae. E) type II supernovae.