Q1S - T F Physics 53 Summer 2010 1 3 A bicycle rider...

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Quiz 1 Solutions Check the best answer. 1. Ball A is thrown horizontally outward from a pier at height h above the water, while at the same time ball B is simply dropped from rest into the water from the same point. Neglect air resistance. Which of the following is NOT true? At every instant until they strike the water, the two balls are at the same height above the water. At every instant until they strike the water, the two balls have the same acceleration. The balls strike the water with the same speed. [Ball A is faster. They have the same vertical component of velocity, but B has zero horizontal component.] The balls strike the water at the same time. Check T or F depending on whether the statement is true or false. 2. Two vectors that are perpendicular to each other cannot add to zero.
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Unformatted text preview: T F Physics 53 Summer 2010 1 3. A bicycle rider travels along a straight road at a constant speed of 5 m/s. Just as she passes a golfer in a golf cart at rest, the golfer starts to accelerate at a constant rate of 2 m/s 2 to overtake her. a. Find the time it takes the golf cart to draw even with the bike. b. Find the speed of the golf cart at this time. c. Find how far the golf cart travels before it draws even with the bike. a. For the bike: x b = 5 t . For the cart: x c = 1 2 ⋅ 2 t 2 . Set these equal: 5 t = t 2 . The two roots are t = , which is when the bike passes the cart, and t = 5 s, which is when the cart catches (and passes) the bike. b. For the cart: v c = 2 t , so at t = 5 we have v c = 10 m/s. c. When t = 5 we have x c = 25 m. Physics 53 Summer 2010 2...
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This note was uploaded on 10/19/2011 for the course PHYSICS 53L taught by Professor Mueller during the Spring '07 term at Duke.

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Q1S - T F Physics 53 Summer 2010 1 3 A bicycle rider...

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