The heliocentric model of the solar system was developed by
a. Brahe.
b. Kepler.
c. Copernicus.
d. Newton.
c
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An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have?
a. 11 b. 12 c. 23 d. 34 e. 35
Molecular Speeds: What is the average translational kinetic energy of an ideal gas at 819 K? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 1.70 × 10-20 J B. 5.65 × 10-21 J C. 1.13 × 10-17 J D. 3.77 × 10-19 J
A device obeying Ohm's law must have a resistance which
A) is proportional to voltage. B) is proportional to current. C) is constant. D) is zero.
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 53° above the horizontal. The weight of the ladder is 30 pounds. A 75-lb boy climbs 6.0-ft up the ladder. What is the magnitude of the friction force exerted on the ladder by the floor?
a. 43 lb b. 34 lb c. 38 lb d. 47 lb e. 24 lb