Physics
Physics, 25.07.2019 08:00, Anne4912

Why doesn’t all of the energy from the sun that enters the atmosphere reach the earth? science question for my hmwk!

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Physics, 24.06.2019 18:10, Eltravieso
Which of the following is false? question a., light energy from the sun warms the surface of the earth’s continents and the ocean. choice b., approximately 50% of the sun’s light energy does not reach the surface of the earth. choice c., the earth radiates heat energy back to the atmosphere. choice d., much of the heat that is lost from the earth’s surfaces is re-radiated back into the atmosphere by greenhouse gases. choice e., the greenhouse gases in the atmosphere have all come from human activity
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Physics, 03.08.2019 21:00, cbender30p860we
Earth and all of the air in the atmosphere around it make up an incredibly complex system. energy is constantly changing forms in many different ways. how would scientists most likely describe the system of the earth in regard to energy? earth is an isolated closed system because energy only escapes the system as heat travels into space. earth is an isolated closed system because the atmosphere allows energy from the sun to enter as heat. earth is an open system because the atmosphere stops energy from escaping into space. earth is an open system because heat energy from the sun enters through the atmosphere.
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Physics, 28.09.2019 21:30, marioruiz7944
Bruce willis messed up and a small asteroid of mass m is about to collide with the earth. as it enters the atmosphere with initial velocity v0 perpendicular to the atmosphere, it is subjected to the friction of air f=-λv. luckily for us it is also melting and its mass is given by m(t)=mo.(1-αt) (t=0 when it enters the atmosphere). the question is to know if the asteroid will have sufficiently melted by the time it hits the earth! be careful: if m varies, f ≠ ma 1. determine the time dependence of the velocity of the asteroid as it falls through the atmosphere. 2. using a taylor expansion of v(t) close to t=0, explain in which cases the asteroid starts by accelerating or decelerating when it enters the atmosphere. (gravity is neglected because its contribution to the change in velocity as the asteroid falls through the atmosphere will be negligible given its initial velocity)
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Biology, 05.10.2019 19:00, laahmiisy
What happens to the speed of light as light from the sun enters the earth's atmosphere and shines down into the oceans, and why? a. the light speeds up as it enters the atmosphere, and slows as it enters the water because water is a denser medium than air so it absorbs more of the light's energy. b. the light slows down as it enters the atmosphere because the air absorbs some light energy; the light speeds up in the water because light moves faster through liquids. c. the light speeds up as it enters the atmosphere and then speeds again as it enters the water because light is able to absorb energy from each medium through which it travels. d. the light slows down as it enters the atmosphere, and then slows again as it enters the water because some of its energy is absorbed by the different media through which it passes.
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