In special relativity, we learned that people in different reference frames will measure time differently. According to general relativity, why does this happen?
A) People in different reference frames experience different realities.
B) It is an illusion, and time really is the same for everyone.
C) They have different worldlines.
D) They are experiencing the same spacetime reality, but from different perspectives.
D
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When a comet is in the inner solar system, what part of it points most directly away from the Sun?
A) the denser side of its nucleus B) its coma C) jets of gas emerging from its nucleus D) its tail
A charge of 10 nC is distributed uniformly along the x axis from x = ?2 m to x = +3 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the point x = +5 m on the x axis?
A.
B.
C.
D.
E.
Determine the heat capacity (in calories/°C) of a lake containing one million gallons (approximately 4 million kilograms) of water at 15°C
a. 4 × 10^6 b. 4 × 10^9 c. 4 × 10^3 d. 1 × 10^3 e. 4 × 10^2
When Jim and Rob ride bicycles, Jim can only accelerate at three quarters the acceleration of Rob. Both start from rest at the bottom of a long straight road with constant upward slope. If Rob takes 5.0 minutes to reach the top, how much earlier should Jim start to reach the top at the same time as Rob?
a. 25 s b. 40 s c. 46 s d. 55 s e. 75 s