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4.1 Whitewater and Sunshine
On a whitewater rafting trip down the Royal Gorge in Colorado, your boat, with a mass of 91 kg, is put into the Arkansas River where it runs relatively slowly, carrying the boat along at 0.7 m/s. Later, as the boat goes over Sunshine Rapids, it speeds up to 2.6 m/s. Compare the momentum of the boat at the beginning of the trip with the momentum of the boat at Sunshine Rapids. How much momentum does the water transfer to the boat when it goes over Sunshine Rapids? There are seven adult passengers on the boat. * 4.2 Headwinds and Tailwinds
On a still day on a straight, level road, a particular cyclist can travel at a constant speed of 25 mph. The next day she travels the same stretch of road with a headwind and travels at 19 mph. What is her momentum (in kg m/s) on the still day? How much of her momentum does she transfer to the air on the next day when there is a headwind? The bicyclist weighs 139 lbs and her bike weighs 53 lbs. The day after that she has a tailwind and she discovers she can travel at 27 mph; how much momentum does the air transfer to her in these conditions? * 4.3 Mae Jemison
Mae Jemison is free floating in outer space to take pictures of the earth. She has become stranded while at rest 2.5 meters from her shuttle. Although she will be sorry to loose such beautiful photographs, she has determined that she must sacrifice her camera in order to return to her shuttle. Using her understanding of momentum conservation, Mae pushes the 525 gm camera away from her body and in the opposite direction of the shuttle, with a speed of 3.5 m/s. How long will it take her to reach the shuttle? (Assume Mae's mass to be 100 kg) |
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Posted on 8/1/05 © 2000-2005 Physics For Everyone. All Rights Reserved. |
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