一道简单的英文力学物理题.急.A patient in therapy has a forearm that weighs 20.5N and lifts a 112N weight.The only other significant forces on his forearm come from the biceps muscle (which acts perpendicularly to the forearm) and the for
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一道简单的英文力学物理题.急.A patient in therapy has a forearm that weighs 20.5N and lifts a 112N weight.The only other significant forces on his forearm come from the biceps muscle (which acts perpendicularly to the forearm) and the for
一道简单的英文力学物理题.急.
A patient in therapy has a forearm that weighs 20.5N and lifts a 112N weight.The only other significant forces on his forearm come from the biceps muscle (which acts perpendicularly to the forearm) and the force at the elbow.If the biceps produce a pull of 235N when the forearm is raised 44.0∘ above the horizontal,find the magnitude and direction of the force that the elbow exerts on the forearm.(Hint:The elbow force and the biceps force together must balance the weight of the arm and the weight it is carrying,so their vector sum must be 132.5 N upward.)
一道简单的英文力学物理题.急.A patient in therapy has a forearm that weighs 20.5N and lifts a 112N weight.The only other significant forces on his forearm come from the biceps muscle (which acts perpendicularly to the forearm) and the for
167N 水平向下12.6°
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