A large block of wood and a small block of iron each register 2000 N on a weighing scale. Taking buoyancy of air into account, which has the greater mass?
A) wood
B) iron
C) both the same
Answer: A
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General Questions: You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal.
A. True B. False
Consider the magnitude of the average speed, vavg, speed, mag, and the magnitude of the average velocity, vavg, velocity, mag, for the same trip. Which of the following is always true?
a. vavg, speed, mag = vavg, velocity, mag b. vavg, speed, mag ? vavg, velocity, mag c. vavg, speed, mag ? vavg, velocity, mag d. none of the above
A terrestrial world's lithosphere is
A) a layer of relatively strong, rigid rock, encompassing the crust and part of the mantle. B) a thin layer of rock that lies between the mantle and crust. C) the interior region in which the planet's magnetic field is generated. D) a layer of hot, molten rock encompassing the core and part of the mantle.
At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 10,000 K?
a. 10 nm b. 100 nm c. 300 nm d. 1.0 × 10^4 nm e. 3.0 × 10^10 nm