A three dimensional image made using a laser is a(n)
a. emission spectrum
b. absorption spectrum
c. wave function
d. hologram
e. photoelectric effect
D
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If we observe one edge of a planet to be redshifted and the opposite edge to be blueshifted, what can we conclude about the planet?
A) The planet is actually two bodies, one moving toward us, the other away from us. B) The planet is in the process of formation. C) The planet is in the process of falling apart. D) The planet is rotating.
A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side
The ball rebounds with a speed of 16.0 m/s along the same line. What is the angular speed of the door just after the collision with the ball? A) 0.127 rad/s B) 0.925 rad/s C) 1.14 rad/s D) 2.28 rad/s E) 4.57 rad/s
An American football field, including end zones, is 360 feet long and 160 feet wide. If you needed to describe it for someone in Europe using the metric system,
which one of the following quantities would be closest to its area in square meters? (2.54 cm = 1.00 in.) A) 4,920 m2 B) 5,350 m2 C) 88.0 m2 D) 12,100 m2 E) 13,200 m2
Why do astronomers conclude that quasars are very far away?
What will be an ideal response?