问题
选择题
潜水员完全进入水中后，当他继续下潜的过程中，受到的浮力和压强的变化情况是（ ）
A．浮力变大
B．浮力变小
C．压强变大
D．压强变小
答案
下潜的过程中，所处深度h增大，排开水的体积v排不变，
∵p=ρ水gh，F浮=ρ水gv排，水的密度ρ水不变，
∴他受到的压强变大，受到的浮力不变．
故选C．
搜题请搜索小程序“爱下问搜题”
潜水员完全进入水中后，当他继续下潜的过程中，受到的浮力和压强的变化情况是（ ）
A．浮力变大
B．浮力变小
C．压强变大
D．压强变小
下潜的过程中，所处深度h增大，排开水的体积v排不变，
∵p=ρ水gh，F浮=ρ水gv排，水的密度ρ水不变，
∴他受到的压强变大，受到的浮力不变．
故选C．
Jack 41 in a small town in England. He always stayed in England 42 his holidays, but last year he thought, “I’ve never been to 43 countries. All my friends go to Spain, 44 they like it very much, so this year I’m going there, too.” So he got on a 45 to Spain and 46 at the airport of the capital, Madrid, and stayed in a hotel for a few days. On the first morning he went 47 for a walk. In England people drive on the left, but in Spain they drive on the right. Jack forgot about this, and 48 he was walking on a busy street, a bicycle knocked him down. Jack 49 on the ground for a few minutes and then he sat up and said, “Where am I?” Just then an old man selling maps went past him. When he heard Jack’s words, he said to him 50 , “Maps of the city, sir?”
|