Physics, 25.07.2019 22:40 hcpsharrissy2952
The light from many stars can be seen from earth. but there is a time delay between the time the light is emitted from the star and when we see it here on earth. which of the following statements best explains why there is a delay? a. the stars light is not bright enough to reach earth immediately b. stars twinkle so they give off light at regular intervals. c. earths atmoshpere is to thick for light to reach the surface as soon as it is emitted d. stars are light-years away from earth, so light takes time to reach our planet
Answers: 1
Physics, 21.06.2019 22:20
Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage
Answers: 2
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
Physics, 22.06.2019 05:00
Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s
Answers: 1
The light from many stars can be seen from earth. but there is a time delay between the time the lig...
Mathematics, 15.02.2020 02:13