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Calculus: Early Transcendental Fun...

7th Edition
Ron Larson + 1 other
ISBN: 9781337552516

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BuyFindarrow_forward

Calculus: Early Transcendental Fun...

7th Edition
Ron Larson + 1 other
ISBN: 9781337552516
Textbook Problem

Lawn Sprinkler A lawn sprinkler is constructed in such a way that d θ / d t is constant, where θ ranges between 45 and1 135 (see figure). The distance die water travels horizontally is

x = v 2 sin 2 θ 32 , 45 θ 135

where v is the speed of the water. Find d x / d t and explain why this lawn sprinkler does not water evenly. What part of the lawn receives the most water?

images

Water sprinkler: 45 θ 135

To determine

To calculate: The value of dxdt and explain why the lawn sprinkler does not spread water

evenly and what part of lawn receives the most water.

Explanation

Given:

The distance water travels horizontally,

x=v2sin2θ32 where 450θ1350

dθdt is constant.

And,

The figure,

Refer to figure in question.

Formula used:

AvΔT= Maximum amount of water in angle..

For maximum amount of water received: |Avdtdx|=|Avdxdt| should be largest.

Calculation:

Consider the equation,

x=v2sin2θ32

Differentiate the above equation with respect to t, to get,

dxdt=dxdθdθdt=v2cos2θ16dθdt

Lawn sprinkler does not spread the water evenly because the ratio of change of speed is not constant.

If dθdt is constant then then water will be distributed uniformly over the arc

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