Light can travel to Earth from a distant star, but sound cannot. Why is this?
a. Light is an electromagnetic wave, and sound requires a medium.
b. The Sun does not make sound.
c. Light is a longitudinal wave, and sound is a transverse wave.
d. The statement is false; both light and sound can travel in empty space.
a
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What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T • m/A)
A) 7.3 × 10-5 J/m3 B) 3.6 × 10-4 J/m3 C) 3.7 × 10-5 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.
The mass of a supermassive black hole thought to power a typical bright active galactic nucleus is roughly ________
A) 1 billion solar masses B) 3 solar masses C) 10 solar masses D) 1 trillion solar masses
The standard kilogram is a platinum-iridium cylinder 39.0 mm in height and 39.0 mm in diameter. What is the density of the material?
a. 21.5 g/cm3 c. 13.6 g/cm3 b. 19.3 g/cm3 d. 10.7 g/cm3
If heat is flowing from a table to a block of ice moving across the table, which of the following must be true?
a. The table is rough, and there is friction between the table and ice. b. The ice is cooler than the table. c. The ice is changing phase. d. All three are possible, but none is absolutely necessary.