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Musya8 [376]
3 years ago
13

compute the derivative of ln(1/2 x) in two different ways. [Hint: one requires the chain rule, the other does not]

Mathematics
1 answer:
Tatiana [17]3 years ago
3 0

Answer:

Step-by-step explanation:

let y=ln(1/2 x)

\[\frac{dy}{dx} =\frac{1}{\frac{1}{2} x} *\frac{1}{2} =\frac{1}{x} \]\\2nd method\\\[y=\ln\frac{x}{y} x=\[\ln\frac{1}{2} +\ln x\]\\[\frac{dy}{dx} =\frac{1}{x} \]

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The rate of the kayak in still water is 3.5 mph

<h3><u>Solution:</u></h3>

Given that It takes 3 hours to paddle a kayak 12 miles downstream

Distance covered in downstream = 12 miles

Time taken to cover downstream = 3 hours

Also given that it takes 4 hours for the return trip upstream

Distance covered in upstream = 12 miles

Time taken to cover upstream = 4 hours

<em><u>Formula to remember:</u></em>

If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr and Speed upstream = (u - v) km/hr

Let the speed of Kayak in still water = x mph

And The speed of current = y mph

For downstream:

Speed downstream = x + y

We know that speed = \frac{distance}{time}

\frac{distance}{time} = x + y

x + y = \frac{12}{3}

x + y = 4  ------ eqn 1

<em><u>For upstream:</u></em>

Speed upstream = x - y

\frac{12}{4} = x - y

x - y = 3 -------- eqn 2

Now let us eqn 1 and eqn 2

Add eqn 1 and eqn 2

x + y + x - y = 4 + 3

2x = 7

x = 3.5

speed of Kayak in still water = x mph  = 3.5 mph

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