I need help real bad please

  • #1
ive been trying to figure this stupid **** out the last 2 days and i cant get an answer..searched all over the internet..im sure its simple but i need to know how to do it..step by step..i already have the answers i just need to know how to get them..so please dont say do it this way n thats it..please word it and do step by step so i can understand..

fig. MC2 shows a uniform 100-cm long bar of weight F w, balanced in equilibrium on a frictionless pivot. [picture a long bar and it being balanced on the point, but the point is towards the beginning of the bar with a weight to the left of it, to keep it at equilibrium]
________________
(________________)
(w) ^

w=weight, ^= pivot

i know the weight of the bar acts 50 cm to the right of the pivot.

Q: what is the value of the upward reaction force on the bar at the pivot?
a. F w
b. 2F w
c. 3F w
d. 4F w

F w(weight)

Q2: what is the value of the load hanging at the left of pivot?
a. F w
b. 2F w
c. 3F w
d. 4F w

no clue how they got the numbers in front of the Fw

also..
how do i find an upward reaction force?

also..
different question: the motionless beam in the photo is 55 cm long and is supported at a frictionless pivot..if each of the 2 hanging objects on the left weighs 1.0N, how much does the clay way. ( a picture shows the 2 hanging objects on one side is heavier than the clay(which is high in the air).. i know the answer is 1.0 N but whats the equations

please help..i got instant messenger if better
 

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