3. Components of a Vector: A patient in therapy has a forearm that weighs 20.5 N and that lifts a 112.0-N weight. These two forces have direction vertically downward. 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 produces a pull of 232 N when the forearm is raised above the horizontal, find the magnitude and direction of the force that the elbow exerts on the forearm. (The sum of the elbow force and the biceps force must balance the weight of the arm and the weight it is carrying, so their vector sum must be 132.5 N, upward.)

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Chapter1: Units, Trigonometry. And Vectors
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3. Components of a Vector: A patient in therapy has a forearm that weighs 20.5 N and that lifts a 112.0-N
weight. These two forces have direction vertically downward. 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 produces a pull of 232 N when the forearm is raised above the horizontal, find the
magnitude and direction of the force that the elbow exerts on the forearm. (The sum of the elbow force
and the biceps force must balance the weight of the arm and the weight it is carrying, so their vector sum
must be 132.5 N, upward.)
Transcribed Image Text:3. Components of a Vector: A patient in therapy has a forearm that weighs 20.5 N and that lifts a 112.0-N weight. These two forces have direction vertically downward. 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 produces a pull of 232 N when the forearm is raised above the horizontal, find the magnitude and direction of the force that the elbow exerts on the forearm. (The sum of the elbow force and the biceps force must balance the weight of the arm and the weight it is carrying, so their vector sum must be 132.5 N, upward.)
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