Sound refraction can occur when the speed of sound
A) remains constant.
B) changes.
C) ranges below supersonic.
D) none of the above
Answer: B
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A general condition that two waves undergo constructive interference is that
A. their phase difference is zero.
B. their phase difference is
C. their phase difference is
D. their phase difference is an even integral multiple of
E. their phase difference is an odd integral multiple of
Right ascension in the sky is very similar to latitude on the Earth
Indicate whether the statement is true or false
A projectile is launched with an initial velocity of 80 m/s at 30° above the horizontal. Neglecting air, what is horizontal component of the projectile's acceleration?
A) 80 m/s2 B) 40 m/s2 C) 9.8 m/s2 D) 0 m/s2 E) 69 m/s2
The center of gravity for each truck is marked X. Which truck(s) will tip over?
1) Truck 1 2) Truck 2 3) Truck 3 4) All will tip. This is because 5) its center of gravity is highest. 6) its center of gravity is lowest. 7) its center of gravity lies beyond a point of support. 8) all the centers of gravity lie above the wheelbases.