Two movers carry a refrigerator by placing it on a light board 3.00 m long. The...

Two movers carry a refrigerator by placing it on a light board 3.00 m long. The refrigerator is a cube of 1 cubic meter with it’s center of mass at the center of the cube. One person lifts at one end of the board with a force of 369 N, and the other lifts the opposite end with a force of 711 N.

(a) (3 points) What is the weight of the refrigerator, and where along the board is its center of gravity located?

(b) (3 points) Suppose the board is not light but weighs 234 N, with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the refrigerator in this case, and where is its center of gravity located?

(c) (4 points) Now the movers have to go up the stairs (using the values from part (b)). The stairs make an angle of 30 degrees with the floor. The refrigerator is securely tight to the board so that it will not slip. The person who lifted with a force of 711N goes in front and will only apply a force perpendicular to the stairs. Make a free-body diagram and calculate the forces which the two movers have to exert while standing still on the stairs?

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genius_generous answered 1 year ago

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