Monday

October 20, 2014

October 20, 2014

Posted by **Anonymous** on Tuesday, September 22, 2009 at 8:45pm.

a) write an equation that expresses the proportionality.

b) determine the constant of proportionality if a beam is 4 in. wide, 6 in. high, and 12 ft long can support a weight of 4800 lb.

c) if a 10-ft beam, made of the same material is 3 in. wide and 10 in.high, what is the max. weight it can support?

- Math: Calculus -
**Reiny**, Tuesday, September 22, 2009 at 8:50pmM = k(w)h^2/l

b)4800 = k(4)(36)/12

solve for k

c) now that you have the full equation, just sub in the values given to find M

- Math: Calculus -
**azeb**, Friday, June 22, 2012 at 8:15pma)M=k(w)h^2/l

b)4800=k(4)(6)^2/144

k=4800 first change the unit of the length from feet to inch and use the expression that i used above.Unit conversion between in and feet is 1ft=30.48cm and 1in=2.54cm

c)since u have the equation all u have to do is plug in the values to the equation

**Answer this Question**

**Related Questions**

Math - The maximum weight M that can be supported by a beam is jointly ...

physics - If two different masses have the same kinetic energy, their momenta ...

Physics - If two different masses have the same kinetic energy, their momenta ...

physics - if a stone at the end of a string is whirled in a circle, the inward ...

Calculus - A rectangular beam is cut from a cylindrical log of radius 30 cm. The...

calculus - A rectangular beam is cut from a cylindrical log of radius 25 cm. The...

Inverse Variation - Help me please.. Explain also :( 1. E is inversely ...

Physics - I have a hard time solving this problem. The weight of an object at ...

Calculus - The strength of a beam with rectangular corss-section is directly ...

Calculus - The strength of a beam with rectangular corss-section is directly ...