1112Assignment 2

1112Assignment 2 - College Physics I 2011/12 Assignment 2...

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College Physics I 2011/12 Assignment 2 Due date: Nov 22 2011 1. A body of mass m 1 + m 2 is split into two parts of masses m 1 and m 2 by an internal explosion which generates kinetic energy K . If the two parts move in the same line after the explosion, show that the speed of one part relative to the other is 2 1 2 1 ) ( 2 m m m m K + 2. A 62-kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 12 m, and falls a total of 31 m. (a) Calculate the spring stiffness constant k of the bungee cord, assuming Hooke’s law applies. (b) Calculate the maximum acceleration she experiences. 3. Early test flights for the space shuttle used a “glider” (mass of 980 kg including pilot) that was launched horizontally at 500km/h from a height of 3500 m. (a) What would its landing speed have been in the absence of air resistance? (b) In fact, the glider eventually landed at a speed of 200km/h at a constant glide of 10º to the Earth. What was the average force of air resistance exerted on it?

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1112Assignment 2 - College Physics I 2011/12 Assignment 2...

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