Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there.
b. The temperature is the hottest in the center.
c. The density of material is very high in the center.
d. Both (b) and (c)
e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.
D
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Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4. b. 1/2. c. 1. d. 2 e. 4.
A __________ is a three dimensional image made using a laser
Fill in the blank(s) with correct word
Which of the following best describes the Tropic of Cancer?
A) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the June solstice. B) It is the circle of latitude on Earth for which the Sun appears to remain above the horizon for a full 24 hours on the June solstice. C) It is the circle of latitude on Earth for which the Sun appears directly overhead at noon on the March and September equinoxes. D) It is the line of right ascension passing through the constellation of Cancer.
If your worldline is following the straightest possible path through spacetime, then
A) you will be weightless. B) you will feel heavier than your normal weight. C) you must be accelerating. D) you must be traveling at constant velocity.