How fast would a rocket ship have to move to contract to half of its proper length (as observed by a stationary object)?
A)
0.25c
B)
0.50c
C)
0.65c
D)
0.78c
E)
0.87c
E
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A mineral can be composed entirely of one element.
a. true b. false
The type of radio galaxy that reveals its motion through the intergalactic medium is called a
A) Seyfert. B) head-tail. C) quasar. D) bipolar jet. E) dual lobe.
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. (a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle?
What will be an ideal response?
Strictly speaking, if any electrical device in an automobile is turned on (such as an air conditioner or even headlights), more fuel is consumed by the engine. This statement is
A) true. B) true only if the engine is running. C) always false. D) sometimes true, sometimes false.