cosine of 30 and also so we change F parallel through F cos that Θ— Θ gift this 30 degrees here— and then us multiply the by the displacement. For this reason that's 50 newtons times cos 30 times 30 meters which is 1.3 times 10 come the 3 joules.">


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This is university Physics Answers with Shaun Dychko. The job-related done by this brothers pulling his sister in the wagon is the ingredient of pressure that he"s using that"s parallel to the displacement multiply by that displacement. Therefore the force is along this line 30 degrees over horizontal and also that way the component that"s parallel come the displacement is gonna be this section here and then we can make a appropriate triangle here and also it"s the nearby leg the this right triangle the we are interested in and also we can discover it by multiplying the hypotenuse by cosine of 30 and so we replace F parallel v F cos the Θ— Θ being this 30 degrees here— and also then we multiply the by the displacement. For this reason that"s 50 newtons time cos 30 times 30 meter which is 1.3 time 10 come the 3 joules.