Why is Venus's atmosphere hotter than Mercury even though it is farther from the Sun?
a. Venus has a thin atmosphere thus allowing more of Sun's radiation to enter.
b. Venus contains water vapor in its atmosphere, which absorbs more heat.
c. Venus contains 96 percent CO2 resulting in very hot temperatures
d. Mars contains more CO2, which has a cooling effect on its atmosphere.
e. Mercury has a hotter atmosphere because it is closer to the Sun than Venus.
c
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A 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 12 × 105 Pa B) 12 × 104 Pa C) 2.9 × 105 Pa D) 2.9 × 104 Pa
Three coplanar parallel straight wires carry equal currents I to the right as shown below. Each pair of wires is a distance a apart. The direction of the magnetic force on the middle wire
a.
is up out of the plane of the wires.
b.
is down into the plane of the wires.
c.
is in the plane of the wires, directed upwards.
d.
is in the plane of the wires, directed downwards
e.
cannot be defined, because there is no magnetic force on the middle wire.
Dark lines that appear in the spectra observed in stellar atmospheres indicate the fact that
A. atoms that would produce light of the darkened frequency bands aren’t present in the atmosphere. B. atoms are present in the atmosphere that have electrons that are absorbing photons of those frequencies. C. atoms are present in the atmosphere that have electrons that are emitting photons of those frequencies D. atoms that would produce light of the darkened frequency bands are forbidden from doing so because of quantum effects.
Single-Slit Diffraction: A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?
A. 3.9 cm B. 4.2 cm C. 6.3 cm D. 2.1 cm E. 8.5 cm