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March 29, 2015

March 29, 2015

Posted by **Hannah** on Sunday, May 27, 2012 at 4:45pm.

The angles bewteen anad b and b and c are all 22 degrees.

I do not kno

- Physics(thank you for the help) -
**Hannah**, Sunday, May 27, 2012 at 4:45pmI do not know how to solve for a ratio.

- Physics(thank you for the help) -
**bobpursley**, Sunday, May 27, 2012 at 4:54pmPhysics(thank you for the help) - bobpursley, Sunday, May 27, 2012 at 4:53pm

I am uncertain what part b is.

I am uncertain what F is in the ratio F/Fa

If F is the total force, then F/Fa=k by definition. So frankly, I have no idea what the question is asking.

- Physics(thank you for the help) -
**Elena**, Sunday, May 27, 2012 at 5:05pmAs the forces FB and FC are equal the horizontal component of force is given as FB = FC = F•cos θ,

θ =22º

The net force applied on the elephant is

Fnet = FA + 2 F•cos θ ........ (1) ( there are two forces on either side of FA)

Given that Fnet is k times FA

Fnet = k• FA where k = 2.32•FA

Fnet = 2.32• Fa .............. (2)

Plug in (2) in (1)

2.32 •FA = FA + 2• F• cos θ

2.32• FA - FA = 2• F•cos θ

(2.32 - 1) • FA = 2 F cos θ

1.32• FA= 2• F• cos θ

Ratio

F / FA = 1.32/( 2• cos θ)=

=1.32/2•cos22º = 0.71

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