I need help on this calc problem?
回答 (1)
2021-03-25 7:23 am
✔ 最佳答案
A: surface area (cm²)D: diameter (cm)
t: time (min)
A = πD²
dA/dt = d(πD)²
dA/dt = 2πD(dD/dt)
When dA/dt = 3 and D = 10:
3 = 2π(10)(dD/dt)
dD/dt = 3/(20π)
dD/dt ≈ 0.0477
Rate at which the diameter decreases
= 3/(20π) cm/min
≈ 0.0477 cm/min
收錄日期: 2021-04-23 23:07:59
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20210324223757AAx6LsK