Three identical resistors are connected in parallel to a battery. If the current of 12 A flows from the battery, how much current flows through any one of the resistors?
A)
12 A
B)
4 A
C)
36 A
D)
24 A
E)
zero
B
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Which of the following is true of Venus?
A) Its atmosphere is transparent to visible light. B) Its atmosphere is transparent to infrared radiation. C) Its atmosphere is as dense as that of Earth. D) Its atmosphere is mostly composed of carbon dioxide.
Consider this image that appears to show four identical galaxies arranged as a cross. What are we really seeing?
A) four galaxies that are nearly identical because they were born at about the same time B) four images of a single background galaxy, created by the gravitational lens of a massive foreground galaxy or cluster C) a large galaxy with four central masses that glow brightly D) a picture taken with a poorly made telescope, so that a single large object appears as four fuzzy dots.
What is the mean free path for the molecules in an ideal gas when the pressure is 100 kPa and the temperature is 300 K given
that the collision cross-section for the molecules of that gas is 2.0 × 10-20 m2? Boltzmann's constant is k = 1.38 × 10-23 J/K. A) 1.1 × 10-6 m B) 2.1 × 10-6 m C) 1.7 × 10-6 m D) 5.3 × 10-6 m E) 1.5 × 10-6 m
The radius of a circle is increased by 5%. The percentage increase of the circumference is
A. 5%. B. 10%. C. 12%. D. 16%.