Thursday

January 29, 2015

January 29, 2015

Posted by **Caroline** on Wednesday, October 26, 2011 at 9:41pm.

I know that to get the total mass i have to do density* lenght and ingegrate, but I dont know how to to it for a triangle...

- Calculus -
**bobpursley**, Wednesday, October 26, 2011 at 9:56pmdraw the triangle.

Notice the base is horizontal frm -1,0 to 1,0

write the equation for the two legs

left leg: y=mx+b where m= (4/1)=4

y=4x+b

4=4*0+b or b=4

integrating the left side..

mass=INT y*(5+x)dx fro x=-1 to 0 do that inegral. Now on the right side, the leg equation is y=-4x+4

same equation as above, integrate from x=0 to 1

be certain in each area to use as y either (-4x+4) or y=(4x+4)

add the two masses

- Calculus -
**Caroline**, Wednesday, October 26, 2011 at 10:38pmWhat I did was:

INT (-1,0) (4x+4)(5+x) dx

INT 4x^+36x+20

I integrated and got (4/3)x^3+18x^2+20x

and evaluated from -1 to 0 and got 10/3 g and then from 0 to 1 and got 118/3 grams added and got 128/3 g and that's not the answer. What am I doing wrong?

- Calculus -
**Steve**, Thursday, October 27, 2011 at 12:22am(4x+4)(5+x) = 4x^2 + 24x + 20

**Answer this Question**

**Related Questions**

Calculus - I know I posted this problem earlier but I dont think it will be seen...

Calculus - Let R be the region bounded by the x-axis, x = 5 and the curve y = x...

calculus - could some body please check this for me? 1. find the exact ...

Calc - Find the mass of the triangular region with vertices (0, 0), (2, 0), and...

Calculus Help!! - Region R is bounded by the functions f(x) = 2(x-4) + pi, g(x...

Calculus AP - Let R be the region bounded by the graphs of y=cos((pi x)/2) and y...

calculus - 1. Let R be the region in the first quadrant enclosed by the graphs ...

calculus - The figure shows the region bounded by the x-axis and the graph of . ...

math, calculus - 1. Consider the region bounded by the curves y=|x^2+x-12|, x=-5...

Physics - The wavelength of the electromagnetic waves is 200 nm. Which of ...