(iii) The volume of air, V mL , in a spherical balloon at time t seconds, is decreasing dV at a rate proportional to V. That is, = -kV , where k is a positive constant. dt Initially the balloon held 1000 mL of air and the air was escaping at a rate of 50 mL/s . (a) Show that k = 20 Calculate the volume of air in the balloon after 30 seconds. Give your answer correct to the nearest mL . (b) (c) Determine the time taken for the volume of the air in the balloon to reduce to 300 mL.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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(iii)
The volume of air, V mL, in a spherical balloon at time t seconds, is decreasing
AP
= -kV , where k is a positive constant.
dt
at a rate proportional to V. That is,
Initially the balloon held 1000 mL of air and the air was escaping at a rate
of 50 mL/s.
1
Show that k:
20
(а)
Calculate the volume of air in the balloon after 30 seconds. Give your
answer correct to the nearest mL ,
(b)
(c)
Determine the time taken for the volume of the air in the balloon to reduce
to 300 mL.
Transcribed Image Text:(iii) The volume of air, V mL, in a spherical balloon at time t seconds, is decreasing AP = -kV , where k is a positive constant. dt at a rate proportional to V. That is, Initially the balloon held 1000 mL of air and the air was escaping at a rate of 50 mL/s. 1 Show that k: 20 (а) Calculate the volume of air in the balloon after 30 seconds. Give your answer correct to the nearest mL , (b) (c) Determine the time taken for the volume of the air in the balloon to reduce to 300 mL.
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