Saturday
May 25, 2013

# Homework Help: Math

Posted by Al on Monday, July 13, 2009 at 12:22pm.

A worker tearing down a barn uses a crowbar 4feet long with the shorter end
being 2 inches from the fulcrum.
If the worker can exert a force of 150lbs at one end of the crowbar, how great a
force can be exerted at the
other end?

(Note the differences in units, 2 inches and 4feet. Units must be the same when
using the lever formula)

He can exert _________ lbs of force.

Formula: (w1)(d1)=(w2)(d2)

• Math - Marth, Monday, July 13, 2009 at 1:06pm

4ft = 48in

Work is the same on both sides, and W = Fd

W1 = W2
F1*d1 = F2*d2
150lbs*48in = F2*2in
F2 = 3600lbs

• Math - iVfTNuaYoBKzG, Tuesday, May 8, 2012 at 11:21pm

I believe the pubilc is more right than the statistics reported here. Unfortunately, these numbers don't have much bearing on the quality of education. I'm very sour on the state of our pubilc education. The system is in very bad need of serious competition.

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