67% . We mathxl.com Kayle Macdowell 4/6/16 11:18 PM Save Homework: Week 10/11 Hw
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67% . We mathxl.com Kayle Macdowell 4/6/16 11:18 PM Save Homework: Week 10/11 Hw Score: 70%, 14 of 20 pt Score: 0 of 1 pt 19 of 20 (14 complete) Question Help Phys Sci 14.5.25 outward from the point of impact of the rock so that the radus of the dircle formed by a rpple increasos at A rock is thrown into a still pond. The circular ripples move the rate of 4 feet per minute. Find the rate at which the area is changing at the instant the radius is 10 feet. e feet per minute. (Type an integer or a decimal. Round to the nearest thousandth as When the radius is 10 feet, the area is changing at approximatelysquare feet per minute. (Type an integer or a decimal. feet, the area is chan ng at approximatelysqua When the radi Sis1 needed.) Enter your answer in the answer box and then click Check Answer Check Answer Clear All All parts showing To see what to study next, go to your Study PlanExplanation / Answer
1)area of the circlular ripple A =r2
differentiate with respect to time t
dA/dt =2r dr/dt
given radius increases at rate of 4 ft/min when radius is 10ft
dr/dt =4 , r =10
dA/dt =2*10*4
dA/dt =80
dA/dt=251.327
area of circular ripple increases at rate of 251.327 ft2/min
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