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PLEASE HELP I HAVE BEEN STUCK ON THIS FOR A WHILE.
A long platform is holding your physics teacher in the air above some hungry alligators. Your physics teacher has a mass of 75 kg and is located 2 m from one end. The 10.0 m platform has a mass of 10.0 kg, and its center of gravity is located 4.0 m from the same end. The platform is being held up by two students, one at either end.


a. What force is required by each student to hold the platform up?

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jcherry99

Answer:

See Below.

Explanation:

I can't transpose the diagram onto Brainly. I'll do my best to describe what is going on.

  • Draw a horizontal line one inch from the each border of the page.
  • To show what each of A and B are supporting, use an up arrow.
  • Label the Ends A and B. B is on the right side.
  • Put the physics teacher about 1.5 inches from B. His force goes down.
  • Label it as 75 * 9.8 Newtons
  • Put the platform mass about 2.5 inches from B
  • Label it as 10 * 9.8 Newtons
  • B is the balance point
  • Now put in the distances.  The lines are horizontal
  1. Student A: 10 meters
  2. Center of mass: 4 meters to B
  3. Mass of Physics: 2 meters.              

Now you are ready to develop the equation

Clockwise

There is only 1 force where B is the Balance point that is going clockwise

10 * Force A

The AntiClockwise Moments

Platform: 4*10kg * 9.8 = 392 N m

Physics T: 2 * 75 * 9.8 = 1470 N m

So the Anti Clockwise moments = the clockwise moments.

10 * Force A = 392 NM  + 1470NM   Divide by 10. Remember that is in meters

Force A = 1862 N M / 10 10 M = 186 N

Does that make some sort of sense? It should Student A is the furthest distance from where all the action is at B. Therefore he is carrying the lightest weight.

Now what is the total force?

(75 + 10 ) * 9.8 = 85 * 9.8 = 833

This is one of those strange things that won't make sense until it does. Read the next sentence carefully. B is carrying most of the weight. Remember Newtons measure weight.

Support of A = 186 N

Support of B = x

Total of A+B = 933

186 + x = 833

x = 933 - 186

x = 647

So the forces are

A supports    186

B supports    647

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