Which of these gases are outgassed from our volcanic eruptions?
A) oxygen, methane, ammonia
B) carbon dioxide, water vapor, oxygen
C) ammonia, water vapor, oxygen
D) water vapor, methane, carbon dioxide
E) helium, carbon dioxide, methane
D
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The flatness problem and the horizon problem can be explained by ____
a. dark energy b. the inflationary universe hypothesis c. grand unified theories d. the electroweak force e. non-baryonic matter
Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of
A) 3. B) 6. C) 9. D) 12. E) 81.
The rigid object shown is rotated about an axis perpendicular to the paper and through point P. The total kinetic energy of the object as it rotates is equal to 1.4 J. If M = 1.3 kg and L = 0.50 m, what is the angular velocity of the object? Neglect the mass of the connecting rods and treat the masses as particles
a.
1.3 rad/s
b.
1.5 rad/s
c.
1.7 rad/s
d.
1.2 rad/s
e.
2.1 rad/s
In the Drude model of electrical conduction, the current density is NOT directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the resistivity of the wire.