1.单选题- (共4题)

A. 圆盘b总是与a沿相同方向转动
B. 圆盘b总是与a沿相反方向转动
C. 若B1、B2同向,则a、b转向相同
D. 若B1、B2反向,则a、b转向相同

A.副线圈中的电流比为1∶2 |
B.副线圈输出功率比为2∶1 |
C.副线圈的接入匝数比为2∶1 |
D.原线圈输入功率比为1∶2 |
2.选择题- (共1题)
完形填空。
One day, I went to my favorite cafe for lunch. I 1 a burger and went to the outdoor seats. While waiting for my meal, a homeless man on a bicycle stopped to ask if there was a grocery store nearby. After I gave him 2, he asked if I had 3 from Santa Clara University. (I was wearing a SCU T-shirt. )I told him, yes. Little did I know that this 4 response would lead to a 90-minute conversation. The man, Michael, told me he was very intelligent. 5, drug use had ruined both his formal education and his pursuit of 6 in his work. He drifted from one topic to another, 7 the fact that I was ready for my lunch.
He clearly had more of a 8to talk than I did. I made every 9 to give him my full attention, never 10 our talk would go on and on... Eventually, I did eat my meal, bite by bite 11 responses in our conversation. Michael was a bit strange. 12 his interests and viewpoints. We had little in 13, but he was fascinated with talking with, as he 14 it,“intelligent people.” I have to admit, I wish our conversation had been 15 to ten or fifteen minutes, but when Michael finally 16 off, he thanked me for listening so 17 to him and for my 18 to talk with him for so long. It was then that I 19 that, just maybe, that was my purpose in life for today … to be there, in that place, at that time, to 20 in that conversation.
3.多选题- (共3题)

A. A、B之间的最大静摩擦力
B. 水平面与B之间的滑动摩擦力
C. A、B之间的动摩擦因数μAB
D. B与水平面间的动摩擦因数μ

A.小球受力个数不变 |
B.小球立即向左运动,且a="8" m/s2 |
C.小球立即向左运动,且a="10" m/s2 |
D.若剪断的是弹簧,则剪断瞬间小球加速度为零 |
4.解答题- (共4题)

(1)求滑块下滑的加速度大小.
(2)若滑块下滑的初速度为5.0m/s,则滑块沿斜面下滑的时间为多长?

(1)此时弹簧的弹性势能多大;
(2)撤去力F,已知弹簧劲度系数k=200N/m,试求A、B分离时弹簧的形变量x2;
(3)已知弹簧的弹性势能与其形变量的平方成正比,试求A、B分离后,物块B的滑行距离S.

(1)力F多大时,物体不受摩擦力;
(2)为使物体静止在斜面上,力F的取值范围.

(1)当小球的速度为多大时,其加速度最大?
(2)小球的最大速度vm?
5.实验题- (共2题)
①将计时方式设定为记录“遮光条从光电门A运动到B的时间”
②将滑块从导轨上某处自由滑下,测出两光电门间距x,并记下毫秒表上的示数
③保持光电门B位置不动,适当移动光电门A的位置,重复步骤②
④重复步骤③若干次
(1)关于操作中的注意事项,下列各项正确的是_____
A.必须洲量遮光条的宽度
B.两光电门的间距应适当大些
C.在每次重复的步骤中,滑块必须从导轨的同一位置自由滑下
D.导轨倾斜是为了平衡摩擦.
(2)已知该同学的两组数据:x1=40cm,t1=0.800s;x2=63cm,t2=0.900s,则滑块的加速度a=_____m/s2.

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【1】题量占比
单选题:(4道)
选择题:(1道)
多选题:(3道)
解答题:(4道)
实验题:(2道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:4
7星难题:0
8星难题:7
9星难题:2