2014年八年级物理下册期中试题及答案(5)

条直线

五、综合应用题（共12分） 36.⑴s=vt························································（1分）

=90km/h × 30/60 h =45km··································（1分）

⑵重力G=mg=6×103kg×10N/kg=6×104

N ························（1分）

牵引力F=F×6×104

f=0.06G=0.06N =3600 N·····················（1分）

⑶压力F=G==6×104

N············································（1分）

压强p=F/S=6×104N / (250×10-4×6m2)=4×105

Pa ················（1分）

37.⑴P=ρ海水gh····················································（·1分）

=1.03×103kg/m3×10N/kg×5000m=5.15×107

Pa··················（2分） ⑵F=PS························································（·1分）

=5.15×107Pa×300×10-4m2=1.545×106

N························（2分）

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