Physics_1112__Spring_2009__Co_op_1__Units_and_1D_motion

Physics_1112__Spring_2009__Co_op_1__Units_and_1D_motion -...

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Name: ______________________________ Section/Instr.: ___________________ Partners: __________________________________________________________ Physics 1112, Spring 2009 1 Cornell University Cooperative Problems, Week 1: Units and 1-D Motion 1. Motorcycle cop and speeder. A car is traveling on a straight road at a constant velocity with magnitude v C . At t = 0, the car passes a police officer on a motorcycle which is initially at rest. The officer gives chase: for t > 0, the officer’s motorcycle accelerates from rest with a constant acceleration of magnitude a M . (a) Sketch the x vs. t graphs and v vs. t graphs for the motion of both objects. Use one set of axes for both x vs. t graphs and one set of graphs for both v vs. t graphs. Indicate on each set of graphs the time T when the motorcycle catches up with the car. (b) Show that when the motorcycle overtakes the car, the motorcycle has a speed twice that of the car, no matter what the value of a M . (Continued on the back.)

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2 (d) Let d be the distance the motorcycle has traveled when it catches up with the car.
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Unformatted text preview: In terms of d , how far has the motorcycle traveled when its velocity equals that of the car? 2. Calculating the fuel for AIR CANADA Flight 143, or Why Units are Important. You may notknow how to fly a Boeing 767 as a (very heavy) glider, but you know about volume, mass, weight and density, as well as the importance of getting units right, so you could have calculated the amount of fuel correctly. You know you have 7682 L of fuel on the plane, and that you need 22,300 kg to make it to your destination. You can only measure the volume of fuel that you put in the tank. In a table you read that the weight of 1 L of fuel is 1.77 lb. The weight of 1 kg of anything is 2.2 lb (near Earth’s surface). (a) How many liters of fuel do you have to add so that the total fuel has a mass of 22,300 kg? (b) The crew added 5220 L. What fraction of the correct volume that should have been added did they add?...
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Physics_1112__Spring_2009__Co_op_1__Units_and_1D_motion -...

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