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 Now online (1)big ...and 174 guests Last 5 registered Oplandisks nothingstar N_loop yipe foxtrotromeo Browse members... |
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Members 8025Messages 2613470 Today 8 Topics 127501 |
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anyone good at physics can help me? |
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ME! i've had 2/10 thru my whole school career |
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A ladder of 6m long rests along a smooth wall at 25" from the wall. The floor on which the ladder rests is rough. Standing half way up the ladder is a woman of mass 75kg. Assuming the ladder does not slip. Determine by graphical solution a. The reaction between the ladder and the wall. b. The reaction of the floor and the ladder. |
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hold on i've got to go to the toilette first please the others don't post before me |
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mgacosα + F2asinα = R2acosα F is friction R is the normal reaction against the ground |
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i used to be good at this, but then i met dave |
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o safe pepé require graphical solution bre's safe |
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i think it's SAFE to assume you're cwnt or Ali G |
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*head explodes* |
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peepee i dont quite get it, but as i read it, the ladder doesnt slip so there is no reaction, just a 75kg woman standing half way up a ladder, is she putting up a bird box? |
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he wants a graphical solution dude. |
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i hope this is usefull, feel free to use it as an informative and decorative classroom learning aids. |
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i take three trucker hats. |
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sold. |
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i'll take one skateboard |
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sold. |
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Ahh fond memories of doing this crap from school.... Off the top of my head, you probably want to check this....... You use Newton's laws to work out forces (F=ma) Moman is m=75kg, a=g=9.8 (acceleration of gravity, g) Force down is 735N. Now work out the horizontal and vertical components on the ladder: Need to do polar <-> cartesian conversion, i.e. x = F cos @, y = F sin @ where @ is theta (use your imagination) In your case, @ = 25 degrees X is force acting horizontally, Y is force acting vertically. x= 666N y = 310N use pythagoras to check: z = sqrt (x^2 + y^2) = 735. OK That should get you going.... Solve graphically means you have to draw all the forces on a diagram to show you understand what's going on. Hope that helps. |
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c) she hits the moon. |
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