Ellie has a friend, Jack, that lives on a planet orbiting a star that is 20 light years away. On the night of her high school prom when Ellie is 17, she uses a radio telescope to send Jack one of her prom pictures (we will not speculate on her motives). Radio waves travel at the speed of light. Jack gets the picture and immediately uses his own radio telescope to send his own picture of his recent dinner date back to Ellie (again, let's not speculate ...). How old is Ellie when she gets Jack's picture?
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Physics, 21.06.2019 22:30
During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?
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Physics, 21.06.2019 22:40
In physics the desire of an object to keep doing what it is doing is termed?
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Physics, 22.06.2019 03:50
A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c
Answers: 3
Physics, 22.06.2019 04:30
Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.
Answers: 3
Ellie has a friend, Jack, that lives on a planet orbiting a star that is 20 light years away. On the...
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