Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud
A) degeneracy pressure
B) radiation pressure
C) stellar winds
D) thermal pressure
D
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Stromatolites are structures created by
a. algae. b. brachiopods. c. sea worms. d. trilobites.
Series/Parallel Circuits: Three resistors with resistances of 2.0 ?, 6.0 ?, and 12 ? are connected across an ideal dc voltage source V, as shown in the figure. If the total current in the circuit is I = 5.0 A, what is the current through the 12-? resistor?
A. 1.7 A B. 2.5 A C. 0.56 A D. 5.0 A E. 0.75 A
When the temperature of a quantity of gas is increased
A. the pressure must increase. B. the volume must increase. C. the pressure and/or the volume must increase. D. none of the above
A visual physical model for Ohm's Law uses a wood board with nails in it and metal balls. The nails in a board represent a fixed amount of electric resistance in a wire
As the metal balls roll through the nail obstacle course, they run into nails and bounce in various directions. The balls represent the charge carriers in a current; the greater the speed of the balls running through the nails, the greater the current represented. The electric potential energy difference between the ends of the wire is represented by the tilt of the board, because a greater tilt represents a greater difference in gravitational potential energy. Explain how this analogy works.