Which of the following planets is closest to the Sun?

a. Mars
b. Mercury
c. Saturn
d. Venus


Answer: b. Mercury

Physics & Space Science

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The attractive force between protons and neutrons in the nucleus is brought about by the exchange of a virtual pi-meson (m? = 140 MeV/c2). Estimate the longest time a ? can exist in accordance with the uncertainty principle ?E??t = h/2?. (h/2? = 1.05 × 10^?34 J?s, 1 eV = 1.6 × 10^?19 C)

a. 3.3 × 10^?18 s b. 2.4 × 10^?21 s c. 4.7 × 10^?24 s d. 6.9 × 10^?27 s

Physics & Space Science

A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit

The time constant for of the new circuit represents the time required for the current to decrease to A) 75% of the original value. B) 25% of the original value. C) 63% of the original value. D) 37% of the original value. E) zero.

Physics & Space Science

A group of periods is called a(n)

a. epoch. b. millennia. c. era. d. eon.

Physics & Space Science

The ocean can be divided into several vertical layers—the surface zone, a transition zone, and the deep zone. As one descends to lower depths, water pressure ________ and temperature ________

A) increases; decreases B) decreases; increases C) increases; increases D) decreases; decreases

Physics & Space Science