Two manned satellites are approaching one another, at a relative speed of 0.275

Question

Two manned satellites are approaching one another, at a relative speed of 0.275 m/s, intending to dock. The first has a mass of 3.35 times 10^3 kg, and the second a mass of 7.7 times 10^3 kg. Calculate the final velocity, in meters per second, of the two satellites after docking, in the frame of reference in which the first satellite was originally at rest. Take the velocity of the second satellite to be in the positive direction. What is the change in kinetic energy, in joules, in this inelastic collision? Calculate the final velocity of the satellites, in meters per second, in the frame of reference in which the second satellite was originally at rest. Take the velocity of the first satellite to be in the negative direction. (d) What is the change in kinetic energy, in joules, using the frame of reference in which the second satellite was originally at rest? Grade Summary Submissions Attempts remaining: 7 (5% per attempt) detailed view

Explanation / Answer

a) v = m1 v1 + m2 v2 / (m1 + m2)

= (0 + (7.7 * 103 * 0.275)) / (3.95 * 103 + 7.7 * 103)

= 0.182 m/s

b) Loss of kinetic energy = 1/2 m2 v22 - (1/2 * (m1 + m2) v2)

= [0.5 * 7.7 * 103 * 0.2752] - [0.5 * 11650 * 0.1822] = 98.2 J

c)v = m1 v1 + m2 v2 / (m1 + m2)

= ( (3.95 * 103 * 0.275) + 0) / (3.95 * 103 + 7.7 * 103)

= 0.0932 m/s

Loss of kE in inelastic collision

=(1/2 * (m1 + m2) v2) -  1/2 m1 v12

= [0.5 * 11650* 0.09322] - [0.5 * 3.95 * 103 * 0.275] = 98.76 J

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