a person slides his hand along the ladder as he walks toward the fixed end. assuming the force from the person is perpendicular to the ladder. find the force the person must apply to hold the ladder at a 10 and 20 degree angle

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Jamar FerryLv2

4 Jul 2019

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Kelly the geologist approachesher min destination and comes acorss a deep ravine. She packed a3.8 m portable teloscopr extension ladder. It has a mass of 15 kg.She was told that in order to get to her mining spot, she must getacross this 2 m gap.

1) what angle will the ladder make with the horizontal?

2) Now since she has carefully lowered the ladder down to thebotton, she isnt entirely sure if it will hold. Her mass is 48 kg.First we need to find the normal force due to vertical wall. Whatwill it be? Assume the wall is frictionless.

3) Using normal force you just found, determine the force offriction between the ladder and horizontal surface compared it tothe maximum allowed friction force between the ladder andhorizontal surface. The coefficient of static friction is 0.75. Canshe make it?

4) If yes, what will happen to the friction force as she climbsdown the ladder? If no, would it make a difference if there wasfriction between the ladder and the vertical wall?

a) a seesaw, 4m long has a pivot point at its center. A 35 kgchild sits on one end of the board. If the board is to be balancedwhat weight should be placed on the other end? What forece does thepivot apply to the board?
b) Two pylons hold up a 67,000 kg bridge that is 30 m long. Pylon Ais 8 m from one endof the bridge and pylon B is 12 m from theothter end. A 2000 kg dump truck sits directly in the middle of thebridge and a 800 kg car is 5 m from pylon A towards the middle ofthe bridge. Draw an extended free body diagram and label all theforeces.
C) why dont't we put door handles in the center of the door?
d) A ladder leans against a wall, making an angle of 60 degreeswith the ground. The ladder has a length 4 m and has the mass(ladder) = 10 kg. The coefficient of static friction between theground and the ladder is = 0.4. The wall however is frictionlessand therefore exerts no vertical force on the ladder. A person,with a mass = 80 kg begins to climb the ladder. How far up theladder can climb before it sarts to fall?

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a person slides his hand along the ladder as he walks toward the fixed end. assuming the force from the person is perpendicular to the ladder. find the force the person must apply to hold the ladder at a 10 and 20 degree angle

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