In some chemical reactions, the rate at which the amount of a substance changes with time is proportional to the amount present. For example, the change of 8-glucono lactone into gluconic acid has a rate dy -0.6y dt when t is measured in hours. If there are 100 grams of 8-glucono lactone present when t = 0, how many grams will be left after the first hour?

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
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(a) In some chemical reactions, the rate at which the amount of a substance
changes with time is proportional to the amount present. For example, the
change of 6-glucono lactone into gluconic acid has a rate
dy
= -0.6y
dt
when t is measured in hours. If there are 100 grams of 8-glucono lactone
present when t = 0, how many grams will be left after the first hour?
(b) Find the volume of the solid generated by revolving the region bounded by y =
Vx and the lines y = 2 and x = 0 about the x-axis.
Transcribed Image Text:(a) In some chemical reactions, the rate at which the amount of a substance changes with time is proportional to the amount present. For example, the change of 6-glucono lactone into gluconic acid has a rate dy = -0.6y dt when t is measured in hours. If there are 100 grams of 8-glucono lactone present when t = 0, how many grams will be left after the first hour? (b) Find the volume of the solid generated by revolving the region bounded by y = Vx and the lines y = 2 and x = 0 about the x-axis.
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