At what temperature would the root-mean-square speed (thermal speed) of oxygen molecules be 13.0 m/s? Assume that oxygen approximates an ideal gas. The mass of one O2 molecule is 5.312 × 10-26 kg. The Boltzmann constant is 1.38 × 10-23 J/K
A) 0.217 K
B) 1800 K
C) 5410 K
D) 0.0666 K
Answer: A
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Two particles, each with charge Q, and a third particle, with a charge q, are placed at the vertices of an equilateral triangle as shown. The total force on the particle with charge q is:
A) Parallel to the left side of the triangle B) Parallel to the right side of the triangle C) Parallel to the bottom side of the triangle D) perpendicular to the bottom side of the triangle E) perpendicular to the left side of the triangle
At its closest approach, a particular comet is about half an AU away from the Sun, and it's about 40 AU away at its farthest point. The semi-major axis of the comet's orbit is about
A. 60 AU. B. 40 AU. C. 1/2 AU. D. 20 AU.
The predictions of special relativity can sound implausible at first. What observational evidence do scientists have that the theory is correct?
A) Subatomic particles in accelerators exhibit effects of time dilation and mass increase at high speeds. B) Light is always observed to travel at the same speed. C) Time dilation can be observed in airplanes. D) All of the above
A conducting rod (length = 80 cm) rotates at a constant angular rate of 15 revolutions per second about a pivot at one end. A uniform field (B = 60 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the emf induced between the ends of the rod?
a. 2.7 V b. 2.1 V c. 2.4 V d. 1.8 V e. 3.3 V