Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
Explorer,
a. sees the lights flash simultaneously in his coordinate system.
b. sees the bow (front) light flash before the aft (rear) light.
c. sees the aft (rear) light flash before the bow(front light.
d. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light.
e. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
b
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Which type of generating plant would you expect to be more energy efficient, steam-electric or hydroelectric?
A) Hydroelectric, because the lake and river water provides natural cooling for the exhaust. B) Steam-electric, because there is so much more energy per ton in fossil fuels than in water behind a dam. C) Hydroelectric, because it is not a heat engine and so is not restricted by the second law of thermodynamics. D) Hydroelectric, because there is so much energy in a large lake raised up behind a dam. E) Steam-electric, because it can have a very high operating temperature due to having a large and thick boiler.
The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 × 10^30 kg, in an almost circular trajectory. Calculate the radius of the orbit and the orbital speed of Venus as it circles the sun
A ball is projected upward at time t = 0 s, from a point on a flat roof 10 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground
The initial velocity of the ball is Consider all quantities as positive in the upward direction. At time the vertical velocity of the ball is closest to A) 0 m/s. B) +175 m/s. C) +12 m/s. D) -175 m/s. E) -12 m/s.
Double-Slit Interference: In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.0400 mm. If the second order bright fringe is measured to be 4.20 cm from the centerline on the screen, what is the wavelength of light?
A. 200 nm B. 381 nm C. 401 nm D. 620 nm E. 763 nm