Physics, 26.03.2020 22:54 hailiemanuel930
Many people assume that air resistance acting on a moving object will always make the object slow down. It can actually be responsible for making the object speed up. Consider a 100 kg Earth satellite in a circular orbit at an altitude of 400 km. A small force of air resistance makes the satellite drop into a circular orbit with an altitude of 200 km.(a) Calculate the satellite's initial speed.
m/s
(b) Calculate its final speed in this process.
m/s
(c) Calculate the initial energy of the satellite-Earth system. (Round your answer to two decimal places.)
×109 J
(d) Calculate the final energy of the system. (Round your answer to two decimal places.)
×109 J
(e) Show that the system has lost mechanical energy. Find the amount of the loss due to friction. (Round your answer to one decimal place.)
(f) What force makes the satellite's speed increase? Hint: You will find a free-body diagram useful in explaining your answer.
Answers: 3
Physics, 22.06.2019 00:50
Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)
Answers: 3
Physics, 22.06.2019 03:30
The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.
Answers: 3
Physics, 22.06.2019 07:40
Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?
Answers: 3
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