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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