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### LA_pretest_11_SHM

Course: PHYS 1110, Fall 2008
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#11 Pretest (SHM), Autumn 200 CU, Boulder r Grad r Undergrad r Faculty r Other r I have done this pretest/tutorial before Part A: A block-and-spring system is directly below a pendulum. The block and pendulum bob both have mass m. The spring constant is k, and the length of the pendulum is l. All parameters have been chosen so that the block is directly below the pendulum bob at all times. The following change is...

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#11 Pretest (SHM), Autumn 200 CU, Boulder r Grad r Undergrad r Faculty r Other r I have done this pretest/tutorial before Part A: A block-and-spring system is directly below a pendulum. The block and pendulum bob both have mass m. The spring constant is k, and the length of the pendulum is l. All parameters have been chosen so that the block is directly below the pendulum bob at all times. The following change is made: the mass of the block and the bob are each doubled. The objects are then released from rest at the same far left position as shown in the figure. Q4: How has this change affected the magnitude of the net force on the block when it is at the far left position? (circle one) same, increased by 2, decreased by 2, other. Q5: How has this change affected the magnitude of the net force on the pendulum bob when it is at the far left position? (circle one) same, increased by 2, decreased by 2, other. Explain your previous answers: Q7: How has this change affected the magnitude of the acceleration of the block when it is at the far left position? (circle one) same, increased by 2, decreased by 2, other. Q8: How has this change affected the magnitude of the acceleration of the pendulum bob when it is at the far left position? (circle one) same, increased by 2, decreased by 2, other. Explain your previous two Has answers Q10: the time it takes the block to travel from the far left position to the equilibrium position (circle one) increased, decreased, or remained the same? Q11: Has the time it takes the pendulum bob to travel from the far left position to the equilibrium position (circle one) increased, decreased, or remained the same? Explain your previous two answers: Part B: Two block-and-spring systems, Case 1 and Case 2, shown. The blocks each have mass m and are attached to identical, ideal springs of spring constant k. In each case, the block moves on a frictionless surface. At the instant shown, each block is a distance d to the left of equilibrium. In Case 1, the block has instantaneous velocity vo to the right. In Case 2, the block has instantaneous velocity vo to the left. Q13...

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