anonymous
  • anonymous
A lever with an input arm of 2 meters has a mechanical advantage of 4. What is the output arm's length?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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JamesJ
  • JamesJ
Use the formula we used in your last question: Advantage = Output/Input. You know two of these variables and hence can calculate the third.
JamesJ
  • JamesJ
Here's a short discussion: "Law of the Lever" http://en.wikipedia.org/wiki/Mechanical_advantage#Law_of_the_lever
anonymous
  • anonymous
@JamesJ Yes, but how do you work it? The mechanical advantage is already given to us. Dont you have to like cross multiply it?

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More answers

JamesJ
  • JamesJ
Yes if Advantage = Output/Input and you know that Advantage = 4 and Input = 2, then what MUST Output be?
JamesJ
  • JamesJ
Advantage = Output/Input hence 4 = Output/2 Thus Output = ....?
anonymous
  • anonymous
@JamesJ I still dont get it
JamesJ
  • JamesJ
Let x be the Output length. Then we have 4 = x/2 What MUST the value of x be?
anonymous
  • anonymous
@JamesJ 2?
JamesJ
  • JamesJ
2/2 = 1, so that's not right. And please stop tagging me.
anonymous
  • anonymous
okay I still dont get it
JamesJ
  • JamesJ
What number divided by 2 gives 4. x/2 = 4. What must x be?
anonymous
  • anonymous
6
anonymous
  • anonymous
8
JamesJ
  • JamesJ
Which one?
anonymous
  • anonymous
8
JamesJ
  • JamesJ
Yes
JamesJ
  • JamesJ
4 times 2 is 8
anonymous
  • anonymous
i knew it but i got confused b/c of cross multiplying
anonymous
  • anonymous
another one How do you find the input arm? MA = 6 Output arm = .8
JamesJ
  • JamesJ
Use EXACTLY the same formula as this problem. MA = Output/Input Now solve for Input
anonymous
  • anonymous
7.5?
JamesJ
  • JamesJ
If MA = Output/Input then Input = Output/MA = 6 / 0.8 = 7.5 Yes
anonymous
  • anonymous
MA = .5 INPUT ARM = .4 Does OUTPUT ARM = .2?
JamesJ
  • JamesJ
MA = Output/Input hence Output = MA * Input = 0.5 * 0.4 = 0.2
anonymous
  • anonymous
Ramp Problem. A 5-meter ram lifts objects to a height of .75 meters. What is the mechanical advantage of the ramp?

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