Two point charges, separated by 1.7 cm, have charge values of +2.0 and ?4.0 µC, respectively. Suppose we determine that 50 field lines radiate out from the +2.0-µC charge. If so, what might be inferred about the ?4.0-?C charge with respect to field lines?
a. 25 radiate out
b. 100 radiate out
c. 100 radiate in
d. 50 radiate in
e. 50 radiate out
c
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Which of the following is a difference between medium-mass stars and massive stars?
A) Unlike medium-mass stars, massive stars can get hot enough to ignite carbon fusion. B) Unlike medium-mass stars, massive stars consume the hydrogen in their cores. C) Unlike medium-mass stars, massive stars ignite hydrogen shells. D) Unlike medium-mass stars, massive stars can become giants or supergiants.
Molecular Speeds: Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10-9 kg. If, to a first approximation, we model the dust particles as an ideal gas, what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 3.5 × 10-6 m/s B. 5.6 × 10-5 m/s C. 7.8 × 10-4 m/s D. 5.2 × 10-3 m/s E. 4.9 × 10-2 m/s
X-rays from astronomical objects can only be detected from telescopes in space
Indicate whether the statement is true or false
At which latitude is the noonday Sun overhead twice a year?
a. 30°S b. 23°S c. 24°N d. 30°N