Homework Help: physics

Posted by andrea on Monday, September 20, 2010 at 7:58pm.

The two angled ropes used to support the crate in the figure below an withstand a maximum tension of 1300 N before they break. The left angle is 30dregres, and the right angle is 45degrees. What is the largest mass the ropes can support? m=?

physics - bobpursley, Monday, September 20, 2010 at 8:19pm
look at the horizonal (I assume the angles are measured to the horizontal).

Tleft*cos30=Tr*cos45
and the vertical..
Tleft*sin30+Tr*cos45=mass*g

so solve for Tleft in the first equation:
tleft=Trcos45/cos30
Trcos45/cos30 *sin30+Trcos45=mg
solve for Tr. Put that in the equation for tleft. Then set it equal , 1300N
thensolve for mass.
physics - andrea, Monday, September 20, 2010 at 9:06pm
is the answer 123.79 kg? or Newtons? thank you for the help
physics - Don, Saturday, October 23, 2010 at 9:55am
it should be in kg.

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