Practice Homework 4 - practice 04 ALIBHAI, ZAHID Latest...

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practice 04 – ALIBHAI, ZAHID 1 Latest unpenalized work: Feb 12 2007 Mon- day 04:00 (after this date you can not make a perfect score). Work cuto±: Feb 11 2007, 4:00 am. Question 1 part 1 of 2 10 points Three objects can only move along a straight, level path. The graphs below show the position d of each of the objects plotted as a function of time t . d t I d t II d t III The magnitude of the velocity b vV b of the object increases in which of the cases? 1. I and II only 2. I only 3. III only 4. I, II, and III 5. II only 6. II and III only 7. I and III only Question 2 part 2 of 2 10 points The sum of the forces s F i = 0 on the object is zero in which of the cases? 1. II and III only 2. I and III only 3. II only 4. I only 5. III only 6. I and II only 7. I, II, and III Question 3 part 1 of 1 10 points A block of mass m accelerates with acceler- ation g up a frictionless plane that is inclined at an angle α above the horizontal. The force F o that pushes the block is at an angle β above the horizontal. Find the force F o . m α β F o 1. mg 1 + sin β cos( β α ) 2. mg 1 cos( α + β ) 3. mg 1 + sin α cos( β α ) 4. mg 1 sin β cos( α + β ) 5. mg 1 sin β cos( β α ) 6. mg 1 + sin α cos( α + β ) 7. mg 1 + sin α cos( α β ) 8. mg sin β cos( α + β ) 9. mg 1 + sin β cos( α β ) 10. mg 1 + sin β cos( α + β ) Question 4 part 1 of 3 10 points
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practice 04 – ALIBHAI, ZAHID 2 The following 3 questions refer to the colli- sions between a car and a truck whose weight is much heavier than the car ( M m ). For each description of a collision below, choose the one answer from the possibilities that best describes the size (or magnitude) of the forces between the car and the truck. m M v v They are both moving at the same speed when they collide. 1. The truck exerts the same amount of force on the car as the car exerts on the truck. 2. Neither exerts a force on the other; the car gets smashed simply because it is in the way of the truck. 3. The car exerts a greater amount of force on the truck than the truck exerts on the car. 4. The truck exerts a greater amount of force on the car than the car exerts on the truck. 5. Not enough information is given to pick one of the answers above. 6. None of the answers above describes the situation correctly. Question 5 part 2 of 3 10 points The car is moving much faster than the heavier truck when they collide. 1. Not enough information is given to pick one of the answers above. 2. The truck exerts a greater amount of force on the car than the car exerts on the truck. 3. None of the answers above describes the situation correctly. 4. The truck exerts the same amount of force on the car as the car exerts on the truck. 5.
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This note was uploaded on 10/13/2009 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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Practice Homework 4 - practice 04 ALIBHAI, ZAHID Latest...

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