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practice exam 1

# practice exam 1 - PHYSICS EXAM 1 P1 Two persons A and B...

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PHYSICS EXAM 1!!! P1. Two persons, A and B, start from origin to a goal C. (See the figure). Person A first walks 2.1 km to the due west and then walks 3.5 km to the direction of angle 45 degrees to the north from the east. Person B walks straight to the goal C. a. (5) What is the displacement vector R A ,1 of the first part of A’s walk in the unit-vector notation? b. (5) What is the displacement vector R A ,2 of the second part of A’s walk in the unit vector notation? c. (5) For the person B to reach the goal by walking on a straight line, what should be the angle θ (measure from the due east) of the walking direction? d. (5) If person A walks at a constant speed v = 1.1 m/s for the whole path, how much time he takes to reach the goal? e. (5) For B to start and arrive simultaneously with A, at what speed B v should he/she walk? Note: Do not forget correct significant figures and units.

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P2. A car starts from rest and travels in a straight line for 12 seconds with a uniform acceleration of 1.5 m/s
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practice exam 1 - PHYSICS EXAM 1 P1 Two persons A and B...

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