Lecture13

# Lecture13 - Wednesday,September17,2008 11:07AM f2008 Sept...

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Solutions to PRS questions: Q1.5e : 1 Q2.2b: 2 Q2.3c: 2 Q2.5a: 2 Q2.5b : 2 Q2.5c: 4 Q2.9d: 5
Q1.5.e What is the unit vector in the direction of the vector < 3, 5, 2 >? 1) < 3, 5, 2 > 2) < 1, 1, 1 > 3) < 0.49, 0.81, 0.32 > 4) < 0.49, 0.81, 0.32 > 5) < 0.3, 0.5, 0.2 >

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Q2.2.b Cart A moves to the left at nearly constant speed. Cart B moves to the left, gradually speeding up. Cart C moves to the left, gradually slowing down. Which cart(s) experience a net force to the left? 1) A only 2) B only 3) C only 4) A and B 5) B and C 6) A and C 7) A, B, and C
Q2.3.c: You push a book across a table. In order to keep the book moving with constant momentum, you have to keep pushing with a constant force. Which statement explains this? 1) A net force is necessary to keep an object moving.

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Lecture13 - Wednesday,September17,2008 11:07AM f2008 Sept...

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