Posted by **Carla** on Friday, November 25, 2011 at 6:58pm.

The strength S of a rectangular beam varies jointly as its width w and the square of its thickness t. If a wood beam 3 inches wide and 5 inches thick supports 300 pounds, how much can a similar beam 3 inches wide and 8 inches thick support?

S=? pounds

- Math -
**Steve**, Friday, November 25, 2011 at 11:11pm
S(w,t) = kwt^2

Find k:

300 = k*3*25

k=4

So, S(w,t)=4wt^2

S(3,8) = 4*3*64 = 768

## Answer This Question

## Related Questions

- Lost in the pits of ALG - I have 5 problems I seem to not be able to comprehend ...
- College Algebra - The load L a horizontal beam can safely support varies jointly...
- AlgebraII - PLEASE HELP! I DO NOT KNOW WHAT TO DO? The maximum weight that a ...
- Algebra II - The maximum safe load of a rectangle beam varies jointly as its ...
- Algebra II - The maximum safe load of a rectangle beam varies jointly as its ...
- Algebra II - The maximum safe load of a rectangle beam varies jointly as its ...
- Calculus - The strength of a beam with rectangular corss-section is directly ...
- Calculus - The strength of a beam with rectangular corss-section is directly ...
- Algebra 2 - The strength of a beam varies inversely with the square of its ...
- calculus - Hi, I'm having trouble with this problem... "If the strength of a ...

More Related Questions