The fact that we always see the same face of the Moon tells us that:
A. The Moon does not rotate
B. The Moon's rotation period is the same as its orbital period.
C. The Moon looks the same on both sides.
D. The far side of the Moon is always dark.
Answer: B. The Moon's rotation period is the same as its orbital period.
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Series/Parallel Circuits: For the circuit shown in the figure, the ideal battery has an emf ? = 80 V. The four resistors have resistances of R1 = 14 ?, R2 = 21 ?, R3 = 21 ?, and R4 = 14 ?. Calculate the rate at which heat is being generated in the resistor R4.
Fill in the blank(s) with the appropriate word(s).
Shown following are five different colors of visible light that travel to Earth from the Sun. Rank these colors of visible light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth’s surface). If two (or more) of the choices reach the surface, rank them as equal by dragging one on top of the other(s).
What is the theoretical efficiency of a Carnot engine that operates between 600 K and 300 K?
A) 100% B) 75% C) 25% D) 50% E) 0%
When two solid spheres of the same material and same radius r are in contact, the magnitude of the gravitational force each exerts on the other is directly proportional to
a. r. b. r2. c. r3. d. r4. e. r6.