Which is the middle number in this list?
a. 10
b. 100
c. 10^-1
d. 10^10
e. 10^2
a
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A charge Q is spread uniformly along the circumference of a circle of radius R. A point particle with charge q is placed at the center of this circle. The total force exerted on the particle q can be calculated by Coulomb's law:
A) if you use R for the distance B) if you use 2R for the distance C) if you use 2?R for the distance D) and the result of the calculation is zero E) none of the above
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
A. Neither, because the specific heat depends on the substance and may vary with temperature. B. Neither, because a change of state may involve release or absorption of latent heat. C. Neither because a substance may do work during a temperature change. D. All of the statements above are correct. E. Only statements (a) and (b) are correct.
What evidence do astronomers have that the Universe is expanding?
A. There is a measurable redshift in the spectral lines of distant galaxies. B. Galaxies disappear when they pass the cosmic horizon. C. The disks of galaxies are getting smaller over time. D. Nearby clusters of galaxies are smaller than more distant ones. E. Distant galaxies are dispersing, pulled apart by the expansion of space.
Satellite Motion: The captain of a spaceship orbiting planet X discovers that to remain in orbit at 410 km from the planet's center, she needs to maintain a speed of 68 m/s. What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.8 × 1019 kg B. 4.2 × 1017 kg C. 2.8 × 1016 kg D. 4.2 × 1014 kg