A container is filled with a mixture of helium and oxygen gases. A thermometer in the container indicates that the temperature is 22.°C. Which gas molecules have the greater average kinetic energy?
A) It is the same for both because the temperatures are the same.
B) The oxygen molecules do because they are more massive.
C) The helium molecules do because they are monatomic.
D) The oxygen molecules do because they are diatomic.
E) The helium molecules do because they are less massive.
A
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_________is the degradation of a material because of electrochemical reactions with its environment.
Fill in the blank(s) with the appropriate word(s).
The image of our galaxy in radio emission from CO, mapping the distribution of molecular clouds, is closest to the image of our galaxy in
A) 21-cm-line radio emission from atomic hydrogen. B) visible light, showing the edges of supernova bubbles. C) visible light, which is closest to how the night sky appears from Earth. D) X-rays from hot gas bubbles in the disk. E) infrared emission from interstellar dust grains.
In the figure below, a hoop (radius R = 1.0 m, mass = 2.0 kg) having four spokes of negligible mass is suspended from a pivot a distance d = .25 m above its center of mass. The angular frequency (in rad/s) for small oscillations is approximately
?
?
a.
4.0.
b.
2.5.
c.
1.5.
d.
1.0.
e.
0.5.
An AC generator has 80. rectangular loops on its armature. Each loop is 12. cm long and 8.0 cm wide. The armature rotates at 1200. rpm about an axis parallel to the long side
If the loop rotates in a uniform magnetic field of 0.30 T, which is perpendicular to the axis of rotation, what will be the maximum output voltage of this generator? A) 220 V B) 124 V C) 182 V D) 167 V E) 120 V