# hw7sol - homework 07 ARMSTRONG DOMINIC Due 3:00 am Question...

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homework 07 – ARMSTRONG, DOMINIC – Due: Oct 23 2007, 3:00 am 1 Question 1, chap 10, sect 1. part 1 of 1 10 points An object having an initial momentum that may be represented by the vector be- low strikes an object that is initially at rest. Which of the following sets of vectors may represent the momenta of the two objects af- ter the collision? Note carefully: The original vector above and the following vectors are all drawn to the same length scale. 1. 2. 3. 4. correct 5. 6. 7. Explanation: There is no external force for the two-object system, so the total momentum is a constant. From the choices, applying the vector sum- mation for the momenta of the two objects, we can easily identify the correct choice. The ±gure below shows the sum of the x - and y -components of the vectors which repre- sent the correct answer. initial momentum The horizontal vectors add to be the same length as the vector presented in the question. The vertical vectors cancel, as expected, since there is no vertical momentum. Question 2, chap 10, sect 1. part 1 of 2 10 points Two blocks, A and B , are connected by a compressed spring. The mass of block A is twice that of block B . Immediately after release, compare the net force on block A to the net force on block B . The table is frictionless and the mass of the spring is zero. 1. F B,net will be in the opposite direction and half as large as F A,net . 2. F A,net is equal in magnitude and direction to F B,net , and not zero. 3. There is no net force on block A or block B .

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homework 07 – ARMSTRONG, DOMINIC – Due: Oct 23 2007, 3:00 am 2 4. F A,net is equal in magnitude and opposite in direction to F B,net , and not zero. correct 5. F A,net and F A,net are both directed toward the left with F A,net larger than F A,net , but not twice as large. Block A is pulling block B . 6.
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hw7sol - homework 07 ARMSTRONG DOMINIC Due 3:00 am Question...

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