问题
选择题
Don't worry. Every- one gets these feelings ____ your age.[ ]
A. on
B. toward
C. even though
D. at
答案
D
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Don't worry. Every- one gets these feelings ____ your age.[ ]
A. on
B. toward
C. even though
D. at
D
=0.3m，且杆可在槽内移动，杆与槽间的滑动摩擦力大小Ff=6N，杆与槽之间的最大静摩擦力等于滑动摩擦力。质量m=1kg的小车从距弹簧上端L=0.6m处由静止释放沿斜面向下运动。已知弹性势能Ep
，式中x为弹簧的形变量。g=10m/s2，sin37º=0.6。关于小车和杆的运动情况，下列说法正确的是（）