题目

MANCHESTER, England — Here’s some good news that vegetarians (素食者) can really sink their teeth into: Researchers in UMA Group have developed genetically engineered fruit trees that produce real meat! Fruit from the new Meat Trees, developed by British scientists using the gene technology, is closely like ordinary grape-fruit. But when you cut the fruit open, inside is fresh beef! “Our trees may sound like something out of a science fiction movie, but it’s really true,” declares Dr. Vincent, director of the UMA Group, which created the amazing trees. “Vegetarians have be如图所示，质量为55g的新鲜鸡蛋在水中下沉．陆续向水中加盐并轻轻搅拌鸡蛋，最后鸡蛋悬浮在水中．求：（1）悬浮时鸡蛋受到的浮力是多少？（2）若鸡蛋的体积是50cm3，则盐水的密度是多少？