Two fixed navigation beacons mark the approach lane to a star. the beacons are in line with the star and are 87 mm apart. a spaceship approaches the star with a relative velocity of 0.7 c and passes the beacons. as the ship passes the first beacon the ship emits a short radar pulse toward the second beacon, and the radar echo is received at the ship. the time interval between the emission of the radar pulse and the reception of the radar echo is closest to:
answer choices: 480 ms, 150 ms, 370 ms, and 340 ms

Rain is pulled by gravity which is a non contact force

The genes are more on the side of.. b nature

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Jenny and fred both play a long note on their trombones. a stationary observer hears the sound increasing and decreasing repeatedly in loudness. which of these must be true? the sound waves from the two trombones have slightly different frequencies.the sound waves from the two trombones have the same frequency.the sound waves from the two trombones have slightly different amplitudes.the sound waves from the two trombones have the same wavelength.the sound waves from the two trombones have slightly different velocities.  lolthe answer is          the sound waves from the two trombones have slightly different frequencies.