1. The diameter of a bicycle wheel is 0.6m. If the bicycle travels at a speed of 12 km/h for 15 minutes, how many revolutions has the wheel made? (Give your answer correct to the nearest integer.)
*please show the process, thanks.
F.2 Maths X1
2007-04-21 9:44 pm
回答 (2)
2007-04-21 9:52 pm
✔ 最佳答案
circumference = 0.6π mafter 15 minutes, the bicycle travels
= 12(15/60)
= 3 m
so, the wheel has made
= 3 / 0.6π
= 2
2007-04-21 13:57:18 補充：
Sorry, I have ignored the unit..after 15 minutes, the bicycle travels= 3(1000)=3000mso, the wheel has made= 3000 / 0.6π= 1592
2007-04-21 10:07 pm
Circumference of the wheel = 2*pi*radius
=diameter*pi
=0.6*pi
In 15mins,the bicycle has travel = (15*60)*(12*1000)/(60*60)
=3000m
so,the wheel made 3000/(0.6*pi)=1592revolutions
=diameter*pi
=0.6*pi
In 15mins,the bicycle has travel = (15*60)*(12*1000)/(60*60)
=3000m
so,the wheel made 3000/(0.6*pi)=1592revolutions
參考: myself .... I hope I can help you~
收錄日期: 2021-04-20 18:34:19
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