Power: A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?
A. 1.1 A
B. 2.2 A
C. 3.3 A
D. 4.4 A
E. 0.91 A
Answer: E
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Which two bodies have substantial atmospheres?
a. Mercury and Venus b. Mercury and Earth c. Mercury and Earth’s Moon d. Earth and Venus e. Earth and Mars
Earth is a noninertial reference system:
a. only because it rotates. b. only because it revolves. c. only because of the movement of the Milky Way Galaxy. d. only because of the motion of the Moon. e. because of all the various ways it moves, including rotation, revolution, and the movement of the Galaxy.
Snell's Law: Light enters air from water. The angle of refraction will be
A. greater than the angle of incidence. B. equal to the angle of incidence. C. less than the angle of incidence.
What is a helium flash?
What will be an ideal response?