如图(A)所示,mA>μmB时,算出mB向右的加速度为a,今去掉mA而代之以拉力T=mAg,如图(B)所示,mB的加速度变为a´,则https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/67f69907d4e74d1b87764e1f84c1e423.png
举一反三
- 如图(A)所示,mA>μmB时,算出mB向右的加速度为a,今去掉mA而代之以拉力...87764e1f84c1e423.png
- 半径为R,质量为mA的均质圆盘A,与半径为,质量为mB的均质圆盘B如图固结在一起,并置于水平光滑面上,初始静止,受二平行力作用,若mA=mB=m,F1=F2=F,则质心速度的大小为_________________,质心加速度的大小为_______________,角加速度大小为_______________________。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201901/e7501505dc41442094d647883433aa18.png
- 图所示的Fl、F2、F3、...、Fn为一平面力系,若此力系平衡,则下列各组平衡方程中()是彼此独立的平衡方程。 A: ∑Fy=0,∑MA(F)=0,∑MB(F)=0 B: ∑Fx=0,∑Fy=0,∑M0(F)=0 C: ∑MA(F)=0,∑MB(F)=0,∑M0(F)=0 D: ∑MA(F)=0,∑MB(F)=0,∑Fx=0 E: ∑MA(F)=0,∑MB(F)=0,∑MC(F)=0
- 如图,尺寸正确标注的图形是: A: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/d7f5cc79b50247069cd9347901587ce7.png"> B: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/25e08fdcfa8d42849b8cce450503b0ef.png"> C: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/0dd480e6dba2481197db009c3b98eac9.png"> D: <img src="https://image.zhihuishu.com/zhs/onlineexam/ueditor/201910/0f8bb7ecb6c74b1290c04861b5c3f7b8.png">
- 同T、V的两个密闭容器中,分别充有A和B两种气体。已知mA : mB=2 : 1,MA : MB=1 : 2,则pA : pB= 。