Midterm1Solution (2)

# Midterm1Solution(2) - PHYSICS 9B MIDTERM 1 October 27 2011 I certify by my signature below that I will abide by the UC Davis Code of Academic

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PHYSICS 9B MIDTERM 1 October 27 , 2011 I certify by my signature below that I will abide by the UC Davis Code of Academic Conduct. This includes not copying from anyone else’s exam not letting any other student copy from my exam not discussing this exam with any student who has not yet taken it, nor providing any information, written or oral, that might get to a student who has not yet taken it. Anyone suspected of cheating will be automatically reported to Student Judicial Affairs. LAST NAME: FIRST NAME: STUDENT ID: (P R I N T) (P R I N T) (LAST 4 DIGITS) Signature: Problem 1. (2 points) What happens with the scale reading after you immerse an object into the water? A. Scale reading will increase by the value of the buoyant force. B. Scale reading will decrease by the value of the buoyant force. C. Scale reading will remain constant. D. Scale reading will increase by the weight of the object. E. Scale reading will decrease by the weight of the object. Solution: Scale reading will increase by the value of buoyant force. When we immerse the block into the water, there is a buoyant force from the water to the block. Accordingly, when two bodies interact, there is an equal downward force from the block acting on the water. 0.00 kg M

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Problem 2. (2 points) Solution The left end of the long spring (point P) is displaced towards the right and kept there. The displacement ˙ x of point P is therefore nonzero (positive). At the instant shown, the wave pulse has not yet reached the right end of the long spring (point S), so this end has not yet been displaced. The only possible choice is 4.
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## This note was uploaded on 11/11/2011 for the course PHY 9B taught by Professor Cheng during the Spring '08 term at UC Davis.

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Midterm1Solution(2) - PHYSICS 9B MIDTERM 1 October 27 2011 I certify by my signature below that I will abide by the UC Davis Code of Academic

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