比热容后阶段测试
Quiz
•
Physics
•
8th Grade
•
Practice Problem
•
Hard
Min Sun
Used 3+ times
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25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
今天早晨,室外的温度最接近
0℃
25℃
50℃
100℃
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
以下现象中,能用分子动理论解释的是
丹桂飘香
浓烟滚滚
落樱缤纷
大雾弥漫
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
“复兴号”列车在减速进站的过程中,列车的惯性
变小
不变
变大
先变小后不变
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
机器甲、乙的功率分别为100瓦、80瓦,则下列说法中正确的是
甲做功可能比乙做功快
甲做功一定比乙做功多
甲每秒做功一定比乙多
甲做功用时一定比乙短
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
如图所示,利用弹簧测力计沿水平方向拉动木块在水平桌面上运动,下列选项中一定是平衡力的是
木块所受到的重力与桌面对木块的支持力
木块对桌面的压力与桌面对木块的支持力
木块受到的摩擦力与木块对弹簧测力计的拉力
木块受到的摩擦力与弹簧测力计对木块的拉力
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
甲、乙两物体在拉力F甲、F乙的作用下(F甲>F乙),沿竖直方向向上做匀速直线运动。若不计空气阻力,则下列判断中正确的是
甲的合力一定大于乙的合力
甲的速度一定大于乙的速度
甲的动能可能小于乙的动能
甲的重力可能小于乙的重力
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
10.如图4所示,轻质杠杆OA可绕O点转动。在杠杆的B点挂上重物,在A端通过细绳施加竖直向上、大小为10牛的拉力F使杠杆水平平衡。如果把重物悬挂点和拉力作用点互换,当杠杆水平平衡时,竖直向上的拉力大小变为22.5牛。通过上述条件可以确定该物体的重力为
12牛
15牛
18牛
21牛
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