contestada

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?

Respuesta :

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