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PY211Midterm2-Practice

# PY211Midterm2-Practice - PY211 MIDTERM EXAM 2 PRACTICE 1...

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PY211 MIDTERM EXAM 2 PRACTICE 1. For the multiple choice questions below, place your letter answer on the line next to each question. _____ A children’ s slide is to be built 3 m high. The slide can be built so that it is either a straight inclined plane or it has curves and bumps. How does the detailed shape of the slide affect the time that it takes to slide down it and the final speed at the bottom, neglecting friction? A) the time required to go down the slide and the final speed are both independent of the shape B) the time required to go down the slide depends on the shape, but the final speed does not C) the time required to go down the slide depends on the final speed, but not the shape D) the time required to go down the slide and the final speed both depend on the shape E) there is not enough information to determine _____ Suppose you can ride a bike to the top of a hill using either a short path that is 1 km long or a longer path that is 2 km long. How much larger is the average force that you would have to exert for the 1 km path compared to the 2 km path? F) Equal G) Half as large H) Twice as large I) Four times as large J) One-Quarter as large _____ A 10 3 kg car traveling at 30 m/sec crashes into a brick wall. What is the average force exerted by the wall on the car during the crash? F) 3.0 x 10 4 N G) 4.5 x 10 5 N H) 2.0 x 10 3 N I) 4.5 x 10 2 N J) Impossible to tell from the given information _____ A spring-loaded toy dart gun is used to shoot a dart straight up in the air and the dart reaches a maximum height of 24 m. The same dart is shot up a second time, but with the spring only compressed half as far. How far does the dart go up this time? K) 24 m L) 20 m M) 16 m N) 12 m O) 6 m P) 3 m _____ A car accelerates from zero to 30 miles per hour in 1.5 sec. How long does it take for it to accelerate from zero to 60 miles per hour, assuming that the power of the engine is independent of velocity and we can neglect friction?

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