Two spaceships approach each other along a straight line at a constant velocity of 0.988c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.900c.
From the point of view of the observer on Earth, what is the speed of the other ship?
Question 2The observed slowing down of time predicted by Einstein's Special Theory of Relativity for an object traveling close to the speed of light is referred to as
A) time dilation
B) time expansion
C) a time warp
D) time contraction
Question 3Which of the following may have played an important role in triggering snowball Earth events?
A) positive feedback
B) negative feedback
C) bipolar feedback
D) chaotic feedback
Question 4How far from a lens of focal length 50.0 mm must the object be placed if it is to form a virtual image magnified in size by a factor of three?
A) 33.3 mm
B) 48.0 mm
C) 38.3 mm
D) 42.2 mm
E) 54.4 mm
Question 5A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m2 and her angular speed increases to 4.0 rev/s.
Determine her initial moment of inertia.
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