# S06s - Physics 204A FIRST EXAM Chapters 1 4 Spring 2006...

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Physics 204A FIRST EXAM Chapters 1 - 4 Spring 2006 1 Name:___________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles. The equations you need are on the equation sheet. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. A 300g cart initially at rest is given a push to the right along a level track beginning at t = 0s. The motion sensor plots the velocity as a function of time as shown in the graph at the right. Answer the following questions. Be sure to explain your answers for full credit. (a)How much time elapses while the cart being pushed? How do you know? According to the graph, the object is speeding up for about 1.0s, so this is the duration of the push. (b)How far does the cart travel while being pushed? How do you know? Using the definition of velocity, v " dx dt # \$ x = vdt % , the distance traveled must be the area under the velocity vs. time curve. " x # 1 2 (2.0)(1.0) \$ " x # 1.0 m . (c)What is the acceleration of the cart travel while being pushed? How do you know? Using the definition of acceleration,

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S06s - Physics 204A FIRST EXAM Chapters 1 4 Spring 2006...

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