Spring 2006

# Spring 2006 - Scott Pratt PHY231 Spring 2006 Introduct...

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Scott Pratt - PHY231, Spring 2006 - Introduct 1 Final Exam Scott Pratt Do not open exam until instructed to do so.

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Scott Pratt - PHY231, Spring 2006 - Introduct 3 Final Exam 2 pt Consider a projectile which strikes a target as shown below. Ignore all forces except gravity. Point A refers to a point just beyond the muzzle of the cannon, B refers to the highest point in the trajectory and C refers to a point just before landing on the cliff. . The magnitude of the vertical component of the velocity at A is the magnitude of the vertical component of the velocity at C 1 . A greater than B less than C equal to . The acceleration at B is the acceleration at C . 2 . A greater than B less than C equal to 2 pt The curve represents an object in simple harmonic motion. Match the points on the curve to the velocity and acceleration of the object. . The velocity is zero, and the acceleration is negative. 3 . A Point A B Point B C Point C D Point D E Point E F Point F G Point G H Point H . The velocity is zero, and the acceleration is positive. 4 . A Point A B Point B C Point C D Point D E Point E F Point F G Point G H Point H 1 pt Arthur Dent stands next to the interstate as five iden- tical cars honk their horns. Car A has already passed Arthur and is moving with a speed of 120 mph. Car B has also passed Arthur and has a speed of 60 mph. Car C is parked on the shoulder. Car D is approaching Arthur at a speed of 30 mph and Car E is approaching Arthur with a speed of 90 mph. . The car whose frequency sounds the highest to Arthur is . 5 . A A B B C C D D E E
Scott Pratt - PHY231, Spring 2006 - Introduct 5 Final Exam 1 pt Ingrid the piano designer is considering four options for altering the pitch of a string: A. Increasing the tension of the string. B. Increasing the length of the string. C. Using a thicker string. D. Using a higher density (mass/volume) material to make the string. Choose the MOST correct answer. . Which options would increase the frequency of the sound? 6 . A A B B C C D D E A or C F B or D G A, B or C H none of these 3 pt Answer the following questions about thermodynamics. . An air conditioner uses an amount of electrical energy U to cool a home. The amount of heat moved from inside the home must be less than or equal to U. 7 . A True B False . If an engine does an amount of work W, and exhausts heat at a temperature of 50 degrees C, the chemical energy con- tained in the fuel must be greater than, and not equal to, W. 8 . A True B False . A heat pump uses an amount of electrical energy U to heat a home. The amount of heat added to a home must be less than or equal to U. 9 . A True B False 2 pt Jane, who has mass M jane , swings down from a tree, starting from rest, using a vine which has a starting angle θ A (see the figure). When the rope is vertical, she rescues Tarzan, who has mass M tarzan > M jane , from the river where he was teasing the crocodiles. Jane and Tarzan then swing together to a tree branch on the other side of the river which has final angle θ D . In the figure, position B is just before Jane picks up Tarzan, while position C

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