Two capacitors with capacitances of 1.0 mF and 0.50 mF, respectively, are connected in series. The system is connected to a 50-V battery. What electrical potential energy is stored in the 1.0-mF capacitor?
a. 5.6 × 10^-4 J
c. 0.065 × 10^-3 J
b. 4.3 × 10^-3 J
d. 1.4 × 10^-4 J
D
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Resolution: If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged?
A. The resolving power quadruples. B. The resolving power doubles. C. The resolving power is cut in half. D. The resolving power is reduced to one-quarter its original value.
Two uniformly charged rods are positioned horizontally as shown. The top rod is positively charged and the bottom rod is negatively charged. The total electric field at the origin:
1.is zero.
2.has both a non-zero x component and a non-zero y component.
3.points totally in the +x direction.
4.points totally in the –x direction.
5.points totally in the +y direction
6.points totally in the –y direction.
7.points in a direction impossible to determine without doing a lot of math.
The cylindrical filament in a light bulb has a diameter of 0.050 mm, an emissivity of 1.0, and a temperature of 3000°C. How long should the filament be in order to radiate 60 W of power? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 7.2 cm B) 8.6 cm C) 9.4 cm D) 5.9 cm E) 11 cm
Binary star systems are considered good candidates in SETI
Indicate whether the statement is true or false