MP33- Momentum Conservation

MP33- Momentum Conservation - MasteringPhysics: Assignment...

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3/2/08 4:56 PM MasteringPhysics: Assignment Print View Page 1 of 3 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1114154 [ Print View ] PHYS 2211 ABCDE Spring 08 MP33: Momentum Conservation Due at 11:59pm on Thursday, March 6, 2008 View Grading Details Filling the Boat A boat of mass 250 is coasting, with its engine in neutral, through the water at speed 3.00 when it starts to rain. The rain is falling vertically, and it accumulates in the boat at the rate of 10.0 . Part A What is the speed of the boat after time 2.00 has passed? Assume that the water resistance is negligible. Hint A.1 How to approach the problem Hint not displayed Part A.2 Find the momentum of the boat before it starts to rain Part not displayed Part A.3 Find the mass of the boat after it has started to rain Part not displayed Express your answer in meters per second. ANSWER: 2.78 Part B Now assume that the boat is subject to a drag force due to water resistance. Is the component of the total momentum of the system parallel to the direction of motion still conserved? ANSWER: yes no The boat is subject to an external force, the drag force due to water resistance, and therefore its momentum is not conserved. Part C The drag is proportional to the square of the speed of the boat, in the form . What is the acceleration of the boat just after the rain starts? Take the positive axis along the direction of motion. Hint C.1 How to approach the problem Hint not displayed Part C.2 Find the time rate of change of momentum of the boat Part not displayed Express your answer in meters per second per second. ANSWER:
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MP33- Momentum Conservation - MasteringPhysics: Assignment...

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