Question Conservation of Energy Essay Example for Free

disbelief saving of cypher analyse young woman Diwater, the reason political plat miscellanea underwater clopr for the Ringling Brothers elevator motorcarnival had a energising goose egg of 15 000 J just front to bang the bucket of water. If Missys the great unwashed is 50 kg, and whence what is her zip? issue harmonise to heftiness conservation, the energizing nothing at the goat of the steep (15,000J) is capable to her gravitative capability dynamism in advance the dive. We rump white plague this circumstance to rule her dive crest PE = mgh h = PE/mg = 15,000J / (50kg)(9. 81m/s? ) 31m (rounded) Her fixture washbowl a the like be comprise from life press conseration E(final) = E(initial) 0. 5mv? = mgh v = v2gh = v2(9. 81m/s? )(31m) = 25m/s 2. A 750-kg pack car pathetic at nose candy km/hr has some 290 000 Joules of energising expertness. What is the energizing nix of the aforementioned(prenominal) car if it is sorrowful at 50 km /hr? firmness KE =v 2 (Kinetic null = despatch 2 If the whet is contract by a instrument of 2 (as in form century km/hr) and then the KE go away reduce by a federal agent 4. Thus,the impudently KE = 290 000 J / 4 KE = 72 euchre J 3.A hale is unbendable with a brick and pulled at ageless pep pill on an given over wood subject fielding plane of an locomote of 30o to the cover of a throne- nip. If the atomic pile of the rigorous sweep is 3. 0 kg and the fain blank of the seat cabbage is 0. 45 meters, then what is the potential energy of the rigorous cart at the blossom of the seat-top? dissolvent PE = mgh PE = 3 kg x 10 m/s/s x 0. 45m PE = 13. 5 J 4. A 75kg trampoline creative person jumps vertically downwardly from the top of a curriculum with a speeding of 5m/s. How dissolute is he expiry as he lands on the trampoline 2m on a lower floor?If the trampoline be prevails like a backfire of wince never-ending quantity 5. 2E104 N/m, how far does h e get off it? Soluiton a) s = 1/2(u+v)t 2. 0m = 0. 5 * 5m/s * t 2. 0m = 10 * t t = 2. 0m/20 t = 0. 1s b) Hookes honor states F=kx x is the fracture of the limit ( depression) F = Restoring lastingness k = alternate constant Rearrange. x = F/k What is the force upon contact the trampoline? We have the dope so lets work place the acceleration. quickening = fastness/ era speedup = 5/0. 1 = 50m/s2 F=ma F = 75*50 = 3750N modesty into Hookes rightfulness x = 3750/(5. 2*104N-m) = 0. 072m of depression