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[shkspeare]

Givn a>1, sketch the curve y=lnx, 1<= x <=a and find the area enclosed by the curve and the lines y = 0, x = a

The region enclosed by the curve and the lines x = 0, y = lna and y=0 is rotated about the Y axis to form a solid of revolution. Find its volume

can some1 write the answer out in full solutions? =(

 

[untamedanimal]

isnt this 2 unit, more accurately Fitzpatrick Excercise 18(a) Q. 28

 

[untamedanimal]

I attached how to do it

 

[CrashOveride]

For your volume answer, when you integrate e^2y, that should yield 1/2e^2y.

So the final answer should be Pi/2[a² - 1]

 

[nike33]

tehy have to bring back the slide rule

 

[CrashOveride]

Slide rule?

 

[untamedanimal]

Originally posted by CrashOveride
For your volume answer, when you integrate e^2y, that should yield 1/2e^2y.

So the final answer should be Pi/2[a² - 1]

yeh sorry. its just annoying typing maths problems up that i make heaps of mistakes