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homework 8

# homework 8 - homework 08 NOORANI ZOHEB Latest unpenalized...

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homework 08 – NOORANI, ZOHEB 1 Latest unpenalized work: Feb 4 2008 Monday 04:00 (after this date you can not make a perfect score). Work cutoff: Feb 5 2008, 4:00 am. Question 1, chap 4, sect 4. part 1 of 3 10 points A ball is thrown and follows the parabolic path shown. Air friction is negligible. Point Q is the highest point on the path. Points P and R are the same height above the ground. Q R P How do the speeds of the ball at the three points compare? 1. bardbl vectorv P bardbl = bardbl vectorv R bardbl < bardbl vectorv Q bardbl 2. bardbl vectorv R bardbl < bardbl vectorv Q bardbl < bardbl vectorv P bardbl 3. bardbl vectorv P bardbl < bardbl vectorv Q bardbl < bardbl vectorv R bardbl 4. bardbl vectorv Q bardbl < bardbl vectorv P bardbl = bardbl vectorv R bardbl 5. bardbl vectorv Q bardbl < bardbl vectorv R bardbl < bardbl vectorv P bardbl Question 2, chap 4, sect 4. part 2 of 3 10 points Which of the following diagrams best indi- cates the direction of the acceleration, if any, on the ball at point R ? 1. 2. 3. 4. 5. 6. 7. The ball is in free-fall and there is no acceleration at any point on its path. 8. 9. Question 3, chap 4, sect 4. part 3 of 3 10 points Which of the following diagrams best indi- cates the direction of the net force, if any, on the ball at point Q ? 1. 2. 3. The ball is in free-fall and there is no acceleration at any point on its path.

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