1:s=3h=3x10m=30m w=FS=1X10*4x30m=3x10*5J 功率无时间无速度应该算不出来吧
2:w有=2.4x10*4Nx10m=2.4x10*5J 机械效率=W有/W总=2.4x10*5J/3x10*5J=80%
3:由题可知,n=3,G动=Fn-G物=1x10*4Nx3-2.4x10*4N=6000N
F拉=G总/n=(6000N+3x10*4N)X3=1.2X10*4N
P=W/t=FV=1.2x10*4Nx0.5m/s=6000J
1:s=3h=3x10m=30m w=FS=1X10*4x30m=3x10*5J 功率无时间无速度应该算不出来吧
2:w有=2.4x10*4Nx10m=2.4x10*5J 机械效率=W有/W总=2.4x10*5J/3x10*5J=80%
3:由题可知,n=3,G动=Fn-G物=1x10*4Nx3-2.4x10*4N=6000N
F拉=G总/n=(6000N+3x10*4N)X3=1.2X10*4N
P=W/t=FV=1.2x10*4Nx0.5m/s=6000J