Questões - UFPI 2001 | Gabarito e resoluções

(Ufpi 2001) Uma prancha está apoiada sobre dois cilindros paralelos, idênticos e dispostos sobre uma superfície horizontal. Empurrando-se a prancha com velocidade constante e considerando-se inexistente qualquer tipo de deslizamento, seja entre a prancha e os cilindros, seja entre os cilindros e a superfície horizontal, a relação vp/vc, entre a velocidade da prancha, vp, e a velocidade dos cilindros, vc, será:

(UFPI -2001) A Victims Story Imagine waking up in a hospital trauma unit and being told by a doctor that your 15 year-old-brother is dead. I wished I had died with him. Tim and I were very close as brothers and spent a lot of time together. A drunk driver - with a blood alcohol level of more two times the legal limit - ended this. My mother and Dad lost a son, and my sister and I lost a brother. The weather was cool, but bright and sunny on May 15, 1981. Tim and I were going on a fishing trip. Tim had just bought a new fishing rod with money from part-time jobs after school. He was anxious to try out his new rod. On the way up we stopped to get something to eat. Tim was a real outdoor person - he loved nature and outdoor activities. The crash occurred when a drunk driver crossed over the center line of the road and hit us head-on. Tim and I were rushed to a hospital. The doctors tried to I Tim so they could ___II him to the Hospital III Sick Children in Toronto. IV Tims injuries were massive, V in the end they VI save him - Tim died. VII impact of the crash VIII devastating on the whole IX . My sister, who was X 13 years old, did not want to believe that Tim was dead and insisted that he had gone fishing for the weekend, and would be back on Sunday. I spent a couple of months in the trauma unit. I did not get a chance to say goodbye to my little brother. Tims funeral was held while I was in hospital. They say time heals all wounds - if thats true then there are a lot of wounds still trying to heal... Doug Abernethy (Adaptado de: http://www.web.ionsys.com/~oadd/Victim.html) GLOSSRIO: fishing rod - canio, vara de pescar try out - experimentar crash - coliso head on - de frente, frontal injury - ferimento, escoriao, traumatismo heal - sarar, curar, cicatrizar wound - ferida Complete a lacuna VII do texto marcando uma das opes apresentadas a seguir:

(UFPI - 2001) A remoo de ferrugem Fe2O3 com cido oxlico H2C2O4 ocorre de acordo com a reao: Fe2O3 + 6H2C2O4 2Fe(C2O4)33- + 3H2O + 6H+ Indique quantos gramas de ferrugem podem ser removidos com 500 mL de soluo de cido oxlico 0,10 M:

(UFPI) - Em 1908, os cientistas Hardy e Weinberg formularam um teorema cuja importncia est no fato dele estabelecer um modelo para o comportamento dos genes nas populaes naturais. Se os valores das frequncias gnicas de uma populao, observada ao longo de geraes, forem significativamente diferentes dos valores esperados atravs da aplicao do teorema, pode-se concluir corretamente que: