Molecular Speeds: At what temperature would the root-mean-square speed of hydrogen, H2, molecules equal 11.2 km/s (the earth's escape speed)? The mass of a hydrogen atom is 1.67 × 10-27 kg, and the Boltzmann constant is 1.38 × 10-23 J/K.

A. 1.01 × 102 K
B. 1.01 × 104 K
C. 1.01 × 106 K
D. 1.01 × 108 K


Answer: B

Physics & Space Science

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Nickel and silver have lattice parameters of 0.352 nm and 0.408 nm, respectively; an electronegativity of 1.8 for each, an FCC structure, and a similar valence. Should they be able to form a continuous-solid solution? _____________

Fill in the blank(s) with the appropriate word(s).

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Kepler's third law, p2 = a3, means that

A) a planet's period does not depend on the eccentricity of its orbit. B) all orbits with the same semimajor axis have the same period. C) the period of a planet does not depend on its mass. D) planets that are farther from the Sun move at slower average speeds than nearer planets. E) All of the above are correct.

Physics & Space Science

How deep is an impact crater compared to its width?

A) 1-10% B) 50-100% C) 30-40% D) 10-20% E) 100-200%

Physics & Space Science

A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 2.96 V/m at a point 33.0 m from the source

What is the power output from the source? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)

Physics & Space Science