(20 13? Yuncheng simulation) "Pay attention to school bus safety and care for children's growth!" Xiaoming's school is new after the promulgation and implementation of the Regulations on School Bus Safety Management. (1) Empty car gravity:

g = mg = 5000kg× 10N/kg = 5× 104n；

* On level ground,

∴ Put the school bus on the ground;

F=G=5× 104N，

Vehicle pressure on the ground:

p = FS = 5× 104n 0. 1 m2 = 5× 105 pa；

(2) The school bus moves in a straight line at a constant speed with rated power.

∴ The work done by school bus traction is w = Pt = 60000 w× 600s = 3.6×107j,

* work done by traction W = F's,

∴ traction: f ′ = ws = 3.6×107j9000m = 4000n.

Sightseeing bus drives in a straight line at a constant speed.

∴ Resistance and traction are a pair of balancing forces.

∴f=f′=4000n.

Answer: (1) The pressure on the horizontal road surface when the empty car is stationary is 5×105 Pa;

(2) The resistance of the school bus is 4000 N. 。