题目

设想从某天起，地球的引力减小一半，那么对于漂浮在水面上的船来说，下列说法中正确的是（    ）A.船受到的重力将减小，船的吃水深度仍不变B.船受到的重力将减小，船的吃水深度也将减小C.船受到的重力将不变，船的吃水深度将不变D.船受到的重力将不变，船的吃水深度将减小 答案：解析：物体的重力 G=mg，船所受浮力F浮=ρgv，假设船所排开水的体积不变，则F浮=ρv，故浮力减为原来的一半，由于船所受重力也减小一半，所以船仍能漂浮且吃水深度不变。答案：A【1】People can see the movie on .A. July 18th B. July 28th C. June 18th D. June 28th【2】When does the movie Wolf WarriorⅡ begin?A. At 9:30 a.m. B. At 9:30 p.m. C. At 9:00 a.m. D. At 11:20 a.m.【3】Jim wants to see the movie with his friends Lily and Lucy. How much should they spend on the tickets?A. ￥25. B. ￥50 C. ￥100. D. ￥150.