Physics4DExam1S10

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0 DO NOT TURN THIS PAGE!!!!! Name: _________________________________ Physics 4D Spring 2010 Exam 1 MAKE SURE TO SHOW ALL WORK IN COMPLETE DETAIL. NO CREDIT WILL BE GIVEN IF NO WORK IS SHOWN. EXPRESS ALL ANSWERS IN SI UNITS.

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1 1. Object 1, of mass 9m 0 and moving at 0.8c, collides with object 2, of mass 12m 0 and moving in the opposite direction at 0.6c. After the collision the two masses stick together. (10 pts) a) Find the speed of the resulting combined object. b) Find the mass of the resulting combined object.
2 2. The identical twins Speedo and Goslo join migration from earth to planet X. It is 30.0 ly away in a reference frame in which both planets are at rest. The twins, of the same age, depart at the same time on different spaceships. Speedo’s ship travels steadily at 0.98c, and Goslo’s at 0.70c. Calculate the age difference between the twins afte r Goslo’s spaceship reaches planet X. Which twin is older? (10 pts)

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3 3. A person holds a 16 ft. pole. A barn has doors at both ends, 10 ft. apart. The person on the outside of the barn begins running toward one of the open barn
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