maths (volume) 3---urgent
2008-03-21 4:54 am
The surface area of a red-hot steel bar decreases by 5% when it completely cools down. Find the percentage change in its length
回答 (2)
2008-03-21 6:18 am
✔ 最佳答案
the surface area of cooled down steel bar = 95%of the hot onethe length of cooled down steel bar=square root of (95%)of the
hot one.=97%
therefore, the percentage change in length =3%
2008-03-21 4:07 pm
the surface area of cooled down steel bar = 95%of the hot one
the length of cooled down steel bar=square root of (95%)of the
hot one.=97%
therefore, the percentage change in length =3%
2008-03-21 08:07:28 補充：
the surface area of cooled down steel bar = 95%of the hot one
the length of cooled down steel bar=square root of (95%)of the
hot one.=97%
therefore, the percentage change in length =3%
the length of cooled down steel bar=square root of (95%)of the
hot one.=97%
therefore, the percentage change in length =3%
2008-03-21 08:07:28 補充：
the surface area of cooled down steel bar = 95%of the hot one
the length of cooled down steel bar=square root of (95%)of the
hot one.=97%
therefore, the percentage change in length =3%
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