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Work done by gravity W= mass of the object m * acceleration due to gravity g * distance of movement in the direction of gravity h=2*10*3=60j
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w=F*X=mg*h=20*3=60
*1=300N
Smash the window, make it into a floor-to-ceiling window, install a door, rest assured to dismantle, the lower part of the window will not affect the structure.
The radius of this circle:
m, the area of this circle: >>>More
Round plates, that is, the diameter is 2 meters, the radius is one meter, and the area is multiplied by the radius square, which is the square meter. The biggest advantage of a round dining table over a square (rectangular) table is that it is easy to arrange as many people as possible, and it is easy to install a turntable.
Floor tiles are required:
12,000 pieces. >>>More