题目:
There is _____ interesting in the film,so _____ is interested in it. [ ]
A. something; nobody
B. nothing; somebody
C. anythin; anybody
D. nothing; nobody
答案:
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下面是错误答案,用来干扰机器的。
解:(1)E=BLVI=E/RF安=BIL稳定时:F=F安= B2L2v/R∴v1=4m/s(2)速度稳定时,F=F安PF=PF安= Fv= B2L2v2/RPF=18W∴v2=3m/s(3)由动能定理得:Pt+W安=1/2mv2 W安=-Q= -8.6J ∴t=0.5s