滋味园面馆

(1)∵G=mg,F=G,

∴车辆满载时地面压力为F=G人+G车=(m车+m人)g =(1300+700)kg×9.8n/kg = 1.96 x 104n;

车辆满载时,地面压力P = FS = 1.96×104 n4×250×10?4m 2 = 1.96×105 pa;

(2)∫P = Wt,

∴观光车正常工作15min耗电量为w = pt = 4000 w×900s = 3.6×106j;

(3)由于电动观光车电机正常工作,电能全部转化为机械能,

电动车的牵引功率与电机相同,即P机械=P电力,

∫P = Wt = Fst = Fv,

∴观光车施加的牵引力为F=P机械v = p电动v = 4000w4m/s = 1000n

F = f,

观光车的阻力为f = f f=F=1000N..

答:

(1)观光车满载时,地面压力为1.96×105 Pa;

(2)观光车正常工作时间为15min,耗电量为3.6×106j;j;

(3)观光车的阻力为1000 N .