A.a="1.0" m/s2,F=260N | B.a="1.0" m/s2,F=330N |
C.a="3.0" m/s2,F=110 | D.a="3.0" m/s2,F=50N |
A.f1向左,大小为2 N,f2为零 |
B.f1向右,大小为3 N,f2为零 |
C.f1向右,f2向左,大小都等于1.2 N |
D.f1向左,f2向右,大小都等于1.2 N |
A.F=Mg | B.Mg<F<(M+m)g |
C.F=(M+m)g | D.F>(M+m)g |
© 2017-2019 超级试练试题库,All Rights Reserved.