A man is moving by you at a speed close to the speed of light. Which of the following correctly summarizes the effects you would notice on his mass, size, and time?
A) His mass would be increased from its value at rest, his length would be decreased from its rest value but only in the direction in which he is moving, and his time would be running slower than yours.
B) His mass would be increased from its value at rest, his length, width, and height would all be decreased no matter what direction he is moving, and his time would be running slower than yours.
C) His mass would be decreased from its value at rest, his length would be decreased from its rest value but only in the direction in which he is moving, and his time would be running slower than yours.
D) His mass would be increased from its value at rest, his size would be increased, and his time would be running slower than yours.
Question 2
Apparent retrograde motion occurs when a planet appears to
A) be stationary with respect to background stars
B) move eastward with respect to background stars
C) move due north with respect to background stars
D) move westward with respect to background stars
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Rotation Rotation–Moving a body part around a central axis.
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Escape Speed Problem
You ride a motor scooter 8 km in 10 minutes. Your speed is