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Conservation of energy
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Ok I'm not entirely sure that I've got this question right so I would appreciate any help, so here it goes the question asks 'what energy transformations takes place on a high striker (a fairground activity in which a person hits a lever with a heavy hammer; the lever propels a mass up a vertical...
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A 100g arrow is pulled back 75cm with an average force of 290N, aimed upwards, and released. Use the law of conservation of energy to solve these problems. a) Neglecting air resistance, how high should the arrow go? b) If the arrow went up 149m, how much work was done against air resistance?...
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Gayle runs at a speed of 3.50 m/s and dives on a sled, initially at rest on the top of a frictionless snow covered hill. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops on her back and together they continue down the hill. What is their speed at...
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a. 0 + mgh = 1/2mv^2 + 0 1/2mv^2 = mgh v=sqrt(2gh) = 3.43 m/s b. I'm not sure how to do this, so I had to hazard a guess: KE top + PE top = KE bottom + PE bottom + Work of friction => 0 + mgh = 1/2mv^2 + 0 + Wf => mgh - 1/2mv^2 = Wf
Is there no energy conservation
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When we look at a particle's rest frame its energy is Mc^2. But the particle decay has some width, so the products of the particle,generally, will have total energy different than Mc^2. How can it be, is there no energy conservation. View more questions Search
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