My Math Forum spiderman needs to get to MJ

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July 20th, 2017, 03:50 AM   #1
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Hi guys. How to solve this? I left physics and maths a long time ago.

Spider-Man needs to get to Mary Jane. Find x and let us know how long the web should be.

Kindly appreciated with your great minds.

Thank you.

This is the diagram.
Attached Images
 spiderman.jpg (24.0 KB, 12 views)

Last edited by skipjack; July 20th, 2017 at 05:12 AM.

 July 20th, 2017, 05:08 AM #2 Global Moderator   Joined: Dec 2006 Posts: 19,535 Thanks: 1750 What is the web (or line or whatever it's called) attached to at the top end? Also, can the line stretch?
July 20th, 2017, 05:15 AM   #3
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Quote:
 Originally Posted by skipjack What is the web (or line or whatever it's called) attached to at the top end? Also, can the line stretch?
I think it refers to the spidey's web that coming out from his wrist.

 July 20th, 2017, 05:30 AM #4 Global Moderator   Joined: Dec 2006 Posts: 19,535 Thanks: 1750 How can he swing across using it if the far end isn't attached to something? It can't be attached to the building where Mary Jane is as she's on the top of that building.
July 20th, 2017, 05:33 AM   #5
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Quote:
 Originally Posted by skipjack How can he swing across using it if the far end isn't attached to something? It can't be attached to the building where Mary Jane is as she's on the top of that building.
Yeah, it makes sense. yeay, i think it attaches to other building though.

 July 20th, 2017, 05:59 AM #6 Math Team   Joined: Jul 2011 From: Texas Posts: 2,767 Thanks: 1422 looks like he starts h = 10 meters above the lowest point of his swing, so the initial potential energy will be converted to kinetic energy ... $mgh = \dfrac{1}{2}mv^2 \implies v^2 = 2gh$ net force at the bottom of the swing is centripetal ... $\dfrac{mv^2}{r} = T - mg$ substitute the given and known values and solve for $r$ which appears to be the value $x$. Thanks from najaa

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