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Question1
An 8.0 meter uniform ladder of weight 355 N leans next to a smooth vertical wall at an angle 50 degrees with respect to the ground. A fire fighter of weight 875 N stands 6.3 meters from the bottom of the ladder. What is vertical and horizontal components in N of the force exerted on the ladder by the ground?
Question2
A car is located on a hydrolic platform 5.0 m by 1.5 m that hoists it up 1 meter. The area placed on the other end of the hydrolic apparatus is 2.75 m squared. What is force necessary on one end of apparatus in order to lift the car? How much work is done lifting the car?
Question3
A horizontal uniform bar of mass 3.0 kg and length 3.0 m is hung straight on two vertical strings. String 1 is attached to the end of the bar, and string 2 is attached a distance 0.7 m from the other end. A monkey of mass 1.5 kg walks from one end of the bar to the other. Find out the tension T_1 in string 1 at the moment that monkey is halfway between the ends of the bar.
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