Two fixed navigation beacons mark the approach lane to a star. The beacons are in line with the star and are 49 Mm apart. A spaceship approaches the star with a relative velocity of 0.50 c and passes the beacons
The passage of the ship between the beacons is timed by an observer on the ship. The time interval of the passage is closest to: A) 280 ms
B) 330 ms
C) 380 ms
D) 170 ms
E) 110 ms
A
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Multiple-Object Accelerating Systems: A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a very light rope that goes over an ideal pulley. If the masses are gently released, what is the resulting acceleration of the masses?
A. 0.00 m/s2 B. 3.7 m/s2 C. 2.5 m/s2 D. 4.9 m/s2 E. 6.1 m/s2
A star that is 70 percent the mass of our Sun would have a habitable zone that:
A. includes Jupiter and its moons B. includes Venus but not the Earth C. includes both Jupiter and Saturn and their moons D. includes Mars but not the Earth E. includes both Mars and the Earth
How does the force between two otherwise unchanged electrical charges vary with distance?
a. The force decreases by the same factor that the distance increases. b. The force is proportional to the reciprocal of the distance. c. The force decreases by the square of the distance. d. The force increases by the amount of the distance. e. The force increases by the square of the distance.
How does a radio station transmit a radio signal to your ear?
A) Electrons moving in the station's antenna send out an electromagnetic wave that travels to your radio, where the wave is amplified and sent to your ear as a more intense electromagnetic wave. B) Electrons moving in the station's antenna send out an electromagnetic wave that travels to your radio, where the wave is transformed into a sound wave that travels to your ear. C) Stationary positive and negative charges residing on the station's antenna exert electrostatic forces that act on your radio, causing the radio to send sound waves to your ear. D) The station's antenna sends an electric current through a wire that runs from the radio station to your radio, causing the radio to send sound waves to your ear. E) Electrons moving in the station's antenna send out a sound wave that travels to your radio, where the wave is amplified and sent to your ear as a more intense sound wave.