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# hmwk1 - v s and the velocity of the current is v c The net...

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Week 1 Homework Due Monday April 7. 1. Give a sports example of an object that travels a large distance but has a small displacement. 2. Can you give a sports example wherein the acceleration of an object is opposite to the direction of its velocity? Do so if you can. 3. Consider Fig. 3-4 of Hay. (a) Is her acceleration positive or negative at time a (while she is push- ing off the ground)? (b) Is her acceleration positive or negative at time e (after she has landed back on the ground)? (c) Is her velocity positive or negative at time b? (d) Is her acceleration positive or negative at time b? (e) What is her velocity at time c (at the top of her jump)? (f) What is her acceleration at time c? 4. In Fig. 3-6 of Hay, which ball has (a) the smallest speed? (b) the greatest launch angle θ ? (c) the largest horizontal component of the velocity? (d) the largest vertical component of the velocity? 5. The figures on the next page show vector diagrams of a swimmer mov- ing with a current. The swimmer’s velocity is

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Unformatted text preview: v s and the velocity of the current is v c . The net velocity of the swimmer v n is the vector sum of v s and v c . (a) Which diagram represents swimming downstream with the current? (b) Which diagram represents swimming upstream against the current? (c) One diagram represents swimming across the river. (The swimmer heads slightly upstream so she goes straight across from one shore to the other.) Which diagram shows this? Week 2 Warmup Questions Submit answers by midnight Sunday April 6. 1. Warmup questions for April 8. What is the best launch angle to use in the shot put? What is the best launch angle to use on a tennis serve? 2. Warmup question for April 10. In a sport with a goaltender such as ice hockey, why is a deﬂection often more effective than a single hard slap shot? 1 v s v n v c v s v n v c v s v n v c v s v n v c (B) (A) (D) (C) 2...
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hmwk1 - v s and the velocity of the current is v c The net...

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