沪教版(上海)物理八年级上学期知识点总结

12341(dB)235123620000HzB20Hz12343.0108m/s.5:__6_1.2347891011f()f2f2f=2f=2ff2f2f=ff12131415161234(m)mdmmmmnm1km=1000m1m=10dm=102=103mm=106m=109nm5shminsmsm1h=60min=3600s1s=103ms=106m678=s/ts=tt=s//m/skm/h1m/s=3.6km/h9;11:232:123312g=9.8N/KgG=mg,3454123----f=F45