Consider the following statement, and explain whether or not it is sensible: Last night I saw Mars move westward through the sky in its apparent retrograde motion
What will be an ideal response?
This statement does not make sense because the apparent retrograde motion is noticeable only over many nights, not during a single night. (Of course, like all celestial objects, Mars moves from east to west over the course of every night.)
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A barge loaded with lumber and iron ore floats in a lock by a dam (a closed pool of water like a big swimming pool). If some of the cargo is thrown overboard, the level of water in the lock will
A) rise. B) drop. C) stay the same. D) rise, provided it is lumber that is thrown overboard. E) rise, provided it is iron ore that is thrown overboard.
If you double the length of each side of a cube, its surface area increases by what factor?
A. 2 B. 4 C. 6 D. 8
Streaks of light made when small debris hits our atmosphere are called
A) meteorites. B) meteors. C) asteroids. D) meteoroids. E) comets.
A substance is allowed to diffuse along a 10-cm length of tubing filled with water. The cross section of the tube is 5.3 cm2 . If the diffusion coefficient is 5.0 × 10^¯10 m2/s, and 6.5 × 10^¯14 kg is transported along the tube in 16 s, what is the difference in the concentration levels of the substance at the two ends of the tube?
a. 3.9E–1 kg/m3 b. 4.3E–2 kg/m3 c. 1.5E–3 kg/m3 d. 8.1E–4 kg/m3