A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. What happens to the potential difference across lamp A?
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There are more large spiral galaxies than there are large elliptical galaxies
Indicate whether the statement is true or false
Two equal mass objects (which are in thermal contact) make up a system that is thermally isolated from its surroundings. One object has an initial temperature of 100°C and the other has an initial temperature of 0°C
What is the equilibrium temperature of the system, assuming that no phase changes take place for either object? (The hot object has a specific heat capacity that is three times that of the cold object.) A) 23°C B) 19°C C) 75°C D) 50°C E) 25°C
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses
A) a vacuum. B) a wooden rod. C) a glass rod. D) an iron rod. E) none of the above
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle ?M 1 then strikes the second mirror and reflects at ?M 2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is a. 0°
b. 45°. c. 90°. d. 150°. e. 235°.