Abby is watching Bob. In this situation:
Consequences of Special Relativity quiz

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Physics
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University
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Hard

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
(C) is (K') and (B) is (K)
(A) is (K') and (B) is (K)
(B) is (K') and (A) is (K)
(C) is (K') and (A) is (K)
Answer explanation
Bob is moving in Abby's reference frame so he gets the '
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Assume all velocities are relativistic
Bob is holding a stick, and Abby understands that the stick will undergo LENGTH CONTRACTION in their reference frame.
Abby uses the LENGTH CONTRACTION equation (L = 𝛄^-1 Lo).
For Abby the length of the stick in Bob's reference frame is
L
Lo
x'
𝛄
Answer explanation
Lo is always the length of the object in question in the reference frame where it is a rest.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Assume all velocities are relativistic. The first letter after V is the frame it is defined in, and the second is the frame it is with respect to.
Chuck runs by Bob at a speed VCB. To Figure out Chuck's Speed in Abby's reference frame Abby's uses relativistic velocity addition.
In the velocity addition equation: Ux = (Ux' + v) / (1 + Ux' * v /c2)
VCB would be
Ux'
v
Ux
-v
Answer explanation
VCB is measured with respect to referece frame B.
Since referece frame B is moving with resepct to Abby it must be Ux'. V in this case would be VBA
4.
MULTIPLE SELECT QUESTION
1 min • 2 pts
Assume all velocities are relativistic. The first letter after V is the frame it is defined in, and the second is the frame it is with respect to.
In Chuck's reference frame, the answer that Abby got for his velocity, Ux' in the last equation, would be (mark all that apply):
VCB + VBA
VCB-VBA
VAC
5.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Assume all velocities are relativistic. The first letter after V is the frame it is defined in, and the second is the frame it is with respect to.
Bob looks at their watch and compares it to Chuck's and Abby's.
Bob notices that:
His watch is going slower that Abby's and Chuck's
His watch is going Faster that Abby's and Chuck's
His watch is going Faster that Abby's but Slower than Chuck's
All watches tick away at the same rate
Answer explanation
Due to TIME DILATION clocks moving with respect to an observer will always appear to tick slower than clocks at rest with respect to the observer.
6.
MULTIPLE CHOICE QUESTION
1 min • 3 pts
Assume all velocities are relativistic. The first letter after V is the frame it is defined in, and the second is the frame it is with respect to.
Bob looks at their watch and compares it to Chuck's and Abby's.
However, he also sees that Chuck is moving away from him faster than Abby (aka: |VBA| < |VCB|)
Bob notices that:
Chuck and Abby's watches tick at the same rate
Chuck's watch ticks faster than Abby's
Abby's Watch ticks faster than Chuck's
Answer explanation
The degree of TIME DILATION depends on how fast a clock is moving with respec to an observer.
The faster the clock moves through space, the slower it moves through time.
7.
MULTIPLE CHOICE QUESTION
1 min • 2 pts
Assume all velocities are relativistic.
Bob looks at their watch and compares it to Chuck's.
He sees they are the same type of watch.
Bob notices that:
His watch is the exact same shape as Chuck's
Chuck's watch looks stretched out in the VCB direction compared to his.
Chuck's watch looks squished out in the VCB direction compared to his.
Answer explanation
From Bob's perspective, since Chuck's watch is moving with respect to him, it is length contracted in the direction of travel.
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