∴車輛滿載時地面壓力為F=G人+G車=(m車+m人)g =(1300+700)kg×9.8n/kg = 1.96 x 104n;
車輛滿載時,地面壓力P = FS = 1.96×104 n4×250×10?4m 2 = 1.96×105 pa;
(2)∫P = Wt,
∴觀光車正常工作15min耗電量為w = pt = 4000 w×900s = 3.6×106j;
(3)由於電動觀光車電機正常工作,電能全部轉化為機械能,
電動車的牽引功率與電機相同,即P機械=P電力,
∫P = Wt = Fst = Fv,
∴觀光車施加的牽引力為F=P機械v = p電動v = 4000w4m/s = 1000n
F = f,
觀光車的阻力為f = f f=F=1000N..
答:
(1)觀光車滿載時,地面壓力為1.96×105 Pa;
(2)觀光車正常工作時間為15min,耗電量為3.6×106j;j;
(3)觀光車的阻力為1000 N .