Protostars can be observed in:
A) the Crab Nebula.
B) the Andromeda Galaxy.
C) the Orion Nebula.
D) our Solar System.
E) the Helix Nebula.
C
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A 83 g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.5 ms. The ball rebounds elastically, and returns to its original height
The time interval for a round trip is 4.00 s. In this situation, assume the plate does not deform during contact. The maximum elastic energy stored by the ball is closest to: A) 16 J B) 24 J C) 32 J D) 48 J E) 64 J
London smog has a deserved reputation as a killer—the smog killed thousands of people
What will be an ideal response?
Energy Conservation With Conservative Forces: A stone is released from rest at a height h at the left side of a loop-the-loop, as shown in the figure. There is no appreciable friction from the track or from air resistance. If the radius of the loop is R, what is the minimum height h for which the stone will not fall off the track at the top of the loop?
A. 3.5 R
B. 2.5 R
C. 2.0 R
D. 
R
E. 3.0 R
A temperature of –65 Kelvin is equivalent to _____ degrees Fahrenheit
a. –576.7 b. 208.0 c. –53.9 d. –338.0