What is the "runaway greenhouse effect"?
What will be an ideal response?
The runaway greenhouse effect is an unstable situation that occurs when an atmosphere changes its composition in a way that leads it to continue to change more and more rapidly. As an example, water vapor in the atmosphere is a greenhouse gas: its presence traps infrared radiation and increases the temperature of an atmosphere. Now if the amount of water vapor were to increase, perhaps by volcanic outgassing, then the temperature would increase. This would lead to enhanced evaporation of any surface water, which would further increase the temperature. Without other stabilizing effects, the temperature would increase until all the water was in the form of water vapor. Such a scenario probably occurred on Venus.
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A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
a. Bx is positive. b. Bz is positive. c. By is negative. d. By is positive. e. Bx is negative.
The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system? Another theory would be needed
a. Common direction of rotation of the planets. b. Common direction of revolution of the planets. c. The formation of hydrogen atoms in the solar system from subatomic particles. d. The density of the Jovian planets.
Components: A vector in the xy-plane has an x component of -7.50 units. What must be the y component of this vector so that its magnitude is 10.0 units. (Note: There are two possible answers.)
What will be an ideal response?
Soaring birds and glider pilots can remain aloft for hours without expending power, due to
A) conduction. B) convection. C) radiation. D) all of the above