What would happen in the Sun if the temperature of the core decreased?
A) The fusion rate decreases, then the core shrinks and heats.
B) The fusion rate increases, then the core shrinks and heats.
C) The fusion rate decreases, then the core expands and heats.
D) The fusion rate increases, then the core expands and cools.
A
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Water is flowing through a pipe whose cross-sectional area at point A is larger than the cross-sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be _____________ the reading on a pressure gauge connected to the pipe at point B
a. the same as b. higher than c. lower than d. unrelated to
The spectral lines from a star that is moving toward Earth will appear redshifted.
Answer the following statement true (T) or false (F)
What do we mean by gravitational time dilation?
A) It is the idea that time runs slower in places where gravity is stronger. B) It is the idea that clocks run slow for people moving at high speed past you. C) It is the idea that everyone measures time differently, depending on his/her reference frame. D) It is the idea that clocks run faster in stronger gravitational fields.
What is the relativistic kinetic energy of an electron moving at a speed of 2.30 × 10^8 m/s? (electron mass is 9.11 × 10^?31 kg and c = 3.00 × 10^8 m/s)
a. 4.57E–14 J b. 1.28E–13 J c. 5.26E–14 J d. 3.38E–14 J e. 8.20E–14 J