Physics
Physics, 18.07.2019 01:30, elkinsmarie88oyzd23

Due to friction with the earth's atmosphere, a large static electric charge could build up on a plummeting asteroid fragment. would you expect the fragment to generate a electric field in this situation? explain why or why not.

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Physics, 31.07.2019 22:50, milhai0627a
An asteroid with a mass of 5.0 x 105 kg collides with the earth and slides horizontally along the ground without bouncing (not actually possible but just pretend). the velocity of the asteroid before impact is 1.1 x 104 m/s and the coefficient of kinetic friction between the asteroid and the earth is 1.80. how much energy is lost due to friction between the asteroid and the earth after the asteroid has come to rest?
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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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