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PHYSICS BASIC CONVERSION PLEASE
Old Posted: 8/21/2010 10:23:22 PM   #1
 
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Default  PHYSICS BASIC CONVERSION PLEASE

Greetings all, I apologize if I am posting in the wrong place. I just purchased all of the Examkrackers books and I had a question to post in the physics forum and it seems to be locked. I needed some help about the physics work concept W = F d cos θ how do you convert the 30 cosine for it to get the jules (example below). How do they get the jules to equal 836, what does cos 30 convert to how do you multiply, and or divide it? Thank you. Any and all pointers in the correct direction would be great! W = F d cos θ = 76.0 N (12.7 m) cos30.0° W = 836 J this is not from the book, I really needed basic information all around to study and this is from a helpful website.
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Old Posted: 1/22/2011 11:17:23 PM   #2
 
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Joules is Newtons * m. Multiply 76 * 12.7 to get 965.2 N*m cos of 30 is .87 .87 * 965.2 = 835.89 rounded to 836 N*m (J) Hope this answered your question.
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Old Posted: 1/25/2011 9:21:35 PM   #3
 
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Default  Re: PHYSICS BASIC CONVERSION PLEASE

[quote:a535cac1e1="peacerosetx"]Greetings all, I apologize if I am posting in the wrong place. I just purchased all of the Examkrackers books and I had a question to post in the physics forum and it seems to be locked. I needed some help about the physics work concept W = F d cos θ how do you convert the 30 cosine for it to get the jules (example below). How do they get the jules to equal 836, what does cos 30 convert to how do you multiply, and or divide it? Thank you. Any and all pointers in the correct direction would be great! W = F d cos θ = 76.0 N (12.7 m) cos30.0° W = 836 J this is not from the book, I really needed basic information all around to study and this is from a helpful website.[/quote:a535cac1e1] You should probably review the lecture about Work. Work is defined as the magnitude of force acting in the direction of motion. Let's say you have a box on the floor and a person applies a force at one of the angles of the box so that the force vector is slanted towards the ground. This force is applied over some distance. In this scenario, you would need to realize that when considering the work done on an object, it's only the horizontal component of that force that we care for. For instance, the person can apply a force directly on top of the box but it would accomplish no "work." In order to find the horizontal component of the force, you need to resort to basic trig functions "SOH CAH TOA." They'll most likely provide an angle for the example I gave and you would use it to find the vertical component. Let's say we are told the angle is 30 degrees with respect to the vertical component and the applied force is 100 Newtons. Here we are interested in the horizontal component of this force. To find it we simply take the Hypotenuse (applied force in this case) times cos(theta). Hcos(theta) = Horizontal Component of Force. Cos(theta) of 30 degrees is .87 (you should memorize sin and cos thetas for angles: 0, 30, 45, 60, and 90) So 100 N x 0.87 gives a horizontal force of 87 Newtons. Multiply this horizontal force times the distance traveled and you have the amount of work done on the object. Even though my explanation is really lengthy, in reality, this problem isn't that difficult at all. It just takes practice and eventually it'll become trivial.
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Old Posted: 12/8/2017 2:08:24 AM   #12
 
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