At a pressure of 1 atmosphere, a mixture of two metals (A and B) has the three phases ?, ?, and ? in equilibrium. Can the temperature be changed and still have the ?, ?, and ? phases in equilibrium? _____________
Fill in the blank(s) with the appropriate word(s).
No
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An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates
All the geometric parameters of the capacitor (plate diameter and plate separation) are now DOUBLED. If the original energy density between the plates was u0, what is the new energy density? A) 16u0 B) 4u0 C) u0 D) u0/4 E) u0/16
Two spaceships approach Earth from opposite directions. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?
A) 0.51c B) 0.55c C) 0.58c D) 0.61c E) 0.64c
A plane is moving due north, directly towards its destination. Its airspeed is 210 mph. A constant breeze is blowing from west to east at 20.0 mph. At what rate is the plane moving north?
a. 209 mph b. 211 mph c. 204 mph d. 199 mph e. 194 mph
At t = 0 the switch S is closed with the capacitor uncharged. If C = 30 ?F, ? = 50 V, and R = 10 k?, what is the potential difference across the capacitor when I = 2.0 mA?
A. 20 V B. 15 V C. 25 V D. 30 V E. 45 V