As a spaceship is moving toward Earth, an Earthling measures its length to be 325 m, while the captain on board radios that her spaceship's length is 1150 m. (c = 3.00 × 108 m/s)
(a) How fast is the rocket moving relative to Earth?
(b) What is the TOTAL energy of a 75.0-kg crewman as measured by (i) the captain in the rocket and (ii) the Earthling?
(a) 0.959c = 2.88 × 108 m/s
(b) (i) 6.75 × 1018 J (ii) 2.39 × 1019 J
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Mercury's crust
A. is much thicker than Earth's or Venus's. B. is molten because it is so close to the Sun. C. has an unusually high concentration of silicate rocks. D. may have been mostly lost after a collision with a large planetesimal.
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Answer the following statement true (T) or false (F)
A system consisting of a positively-charged particle and an electric field
A. loses potential difference and kinetic energy when the charged particle moves in the direction of the field. B. loses electric potential energy when the charged particle moves in the direction of the field. C. loses kinetic energy when the charged particle moves in the direction of the field. D. gains electric potential energy when the charged particle moves in the direction of the field. E. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
A circuit containing an AC generator, a capacitor, an inductor, and a resistor has a high-Q resonance at 1 000 Hz. From greatest to least, rank the following contributions to the impedance of the circuit at that frequency and at lower and higher frequencies. Note any cases of equality in your ranking
(a) XC at 500 Hz (b) XC at 1 500 Hz (c) XL at 500 Hz (d) XL at 1 500 Hz (e) R at 1 000 Hz
1.(c) > (d) > (a) > (e) > (b) 2.(a) > (d) > (b) > (c) > (e) 3.(b) > (c) > (a) > (d) > (e) 4.(d) > (a) > (e) > (c) > (b)