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Magnitude of Force within incline?

by anglum
Tags: force, incline, magnitude
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silvashadow
#37
Sep27-07, 09:53 PM
P: 71
53.9cos34 is greater than 1.45
anglum
#38
Sep27-07, 09:54 PM
P: 275
im at a loss for # 2
johnsonandrew
#39
Sep27-07, 09:54 PM
P: 88
20.3 !!! Check it...
anglum
#40
Sep27-07, 09:56 PM
P: 275
20.3 is incorrect for the normal force otherwise known as #2
anglum
#41
Sep27-07, 09:57 PM
P: 275
cant u use the pythagorean theorem to solve for # 2 since we know the horizontal is 36.356N

and the hypotenuse is what then? 53.9N

so woudlnt it be 53.9^2 = 36.356^2 +Fn^2

Fn = 39.792
johnsonandrew
#42
Sep27-07, 09:57 PM
P: 88
Damn I was sure that was it..
johnsonandrew
#43
Sep27-07, 09:58 PM
P: 88
I said that 30.2^2 + F^2 = 36.4^2
anglum
#44
Sep27-07, 09:59 PM
P: 275
if using what u listed johnson using the pythagorean theorem the Fn = 36.0987

is that what u get as well???
anglum
#45
Sep27-07, 10:00 PM
P: 275
but that is also incorrect
johnsonandrew
#46
Sep27-07, 10:01 PM
P: 88
Me? No I get 20.3 or 20.4
johnsonandrew
#47
Sep27-07, 10:01 PM
P: 88
20.4 with correct significant figures... but I doubt it would be marked wrong for being only 0.1 off of the correct answer
johnsonandrew
#48
Sep27-07, 10:02 PM
P: 88
But that has to be right: The line you get when you connect the horizontal force with the dotted line is the normal force. And it also forms a right triangle..
johnsonandrew
#49
Sep27-07, 10:03 PM
P: 88
If there is no penalty for entering wrong answers try 20.4 just in case... because I can't see how else to get the answer.
anglum
#50
Sep27-07, 10:04 PM
P: 275
i know i am totally puzzled on # 2

the hypotenuse we have established as 36.356N

the dotted line in the picture is equal to what?

the line which is the normal force squared is hyp squared minus dotted line squared
learningphysics
#51
Sep27-07, 10:05 PM
HW Helper
P: 4,125
did you get the first part? what did you get?

Suppose F is the horizontal force... what is the component of F perpendicular to the plane? What is the component of F parallel to the plane?
johnsonandrew
#52
Sep27-07, 10:05 PM
P: 88
dotted line is equal to parrelled force = Fg*sin x = 30.1964
johnsonandrew
#53
Sep27-07, 10:07 PM
P: 88
F parallel is 30.1713, not 30.1964. AHh
johnsonandrew
#54
Sep27-07, 10:07 PM
P: 88
F perpendicular is 54.0(cos 34), no? And wouldn't that be the normal force? If that's true we're making it more difficult than it is. But I guess we tried that earlier: 44.8 N


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