What force must be applied to roll a 120-pound barrel up an inclined plane 9 feet long to a height of 3 feet (disregard friction)?L/I = R/E .L = Length of ramp, measured along the slope.I = Height of ramp.R = Weight of object to be raised or lowered.E = Force required to raise or lower object.
发布于 2021-02-17 16:38:37
【单选题】
A 40 pounds.
B 120 pounds.
C 360 pounds.
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