The molecular weight of nitrogen is 28 g/mol. What is the rms speed of nitrogen molecules at 8.0°C?
A) 450 m/s
B) 500 m/s
C) 550 m/s
D) 600 m/s
E) 650 m/s
B
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Weight and g: An astronaut drops a marble on the surface of the airless Planet Z-49 and observes that it takes 1.02 s for the marble to fall 2.00 m starting from rest. She also knows that the radius of Z-49 is 3.39 × 106 m. From this information, what will she determine for the mass of Z-49? (G = 6.67 × 10-11 N ? m2/kg2)
A. 3.30 × 1023 kg. B. 6.62 × 1023 kg. C. 4.62 × 1023 kg. D. 8.09 × 1023 kg. E. 9.95 × 1023 kg.
Force on a Moving Charge: At a particular instant, an electron moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A. zero. B. upward. C. toward the north. D. toward the south. E. downward.
A hoop, solid sphere, and solid cylinder each have the same mass and same radius. When rolling down the same incline, which has the greatest torque from gravity on it?
a. the hoop b. the sphere c. the cylinder d. They all have the same torque.
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z has a positive charge. e. Z is neutral (has no net charge).