题目内容
请完成下列单位换算:
(1)72km/h=
(2)0.5min=
(1)72km/h=
20
20
m/s;(2)0.5min=
30
30
s.分析:(1)速度单位间的关系为:1m/s=3.6km/h;
(2)时间单位间的关系为:1h=60min=3600s.
(2)时间单位间的关系为:1h=60min=3600s.
解答:解:(1)72km/h=72×1km/h=72×
=20m/s;
(2)0.5min=0.5×60s=30s;
故答案为:(1)20;(2)30.
1000m |
3600s |
(2)0.5min=0.5×60s=30s;
故答案为:(1)20;(2)30.
点评:根据物理量单位间的换算关系,利用数学上的运算,即可解答.
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