A spaceship is moving past you at a speed close to the speed of light. If you could somehow watch the people inside it over a long period of time, what would you conclude?
A) They are aging more slowly than you.
B) They are aging more rapidly than you.
C) Their mechanical clocks go slower than yours, but the people are aging at the same rate as you.
D) Their time is the same as your time.
A) They are aging more slowly than you.
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Fig. 15-5 shows four Gaussian surfaces surrounding a distribution of charges. Which Gaussian surfaces have an electric flux of +q/?o through them?
(1) a.
(2) b.
(3) b and d.
(4) c.
(5) b and c.
The source of electrons lighting common lamps in your classroom is
1) the power company, 2) the electrical outlet, 3) atoms in the lamp filament, 4) the wires leading to the lamp, whereas the source of energy that lights a common lamp in your home is 5) the power company. 6) the electrical outlet. 7) atoms in the bulb filament. 8) the wires leading to the lamp.
Series/Parallel Circuits: For the circuit shown in the figure, the ideal battery has an emf ? = 80 V. The four resistors have resistances of R1 = 14 ?, R2 = 21 ?, R3 = 21 ?, and R4 = 14 ?. Calculate the rate at which heat is being generated in the resistor R4.
Fill in the blank(s) with the appropriate word(s).
Ideal monatomic gas A is composed of molecules with mass m while ideal monatomic gas B is composed of molecules with mass 4m. The average translational kinetic energies are the same if the ratio of the temperatures TA/TB is:
A. 1/4 B. 1/2 C. 1 D. 2 E. 4