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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
Please write the units

Transcribed Image Text:Adhesive capsulitis, also known as a "frozen shoulder" is a condition that affects the motion of the shoulder
joint. The articular shoulder capsule becomes inflamed, stiff, and restricts a person's mobility. Physical
therapy provides one course of treatment for a frozen shoulder. One of the exercises often performed is the
pendulum. Here, the patient bends forward and lets the injured arm hang downward and swing freely like a
pendulum (see figure). The patient slowly swings their arm in a circular motion, for say 10 cycles, and then
switches direction and completes 10 more. The patient may hold a light-weight dumbbell while performing
this motion, or just use an empty hand. Imagine the situation shown in the drawing. A patient is moving a 7.0-
Ib (3.2 kg) dumbbell at constant speed and completes one circular motion in 1.2 s. What is the radius (r) of the
circular motion?
47°
Arm
Number
i
Units
Expert Solution
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Step 1
We first take the freebody diagram of the weight and draw the centripetal forces, force F in the arm, the weight.
We equate the forces in the X and Y directions to find the radius.
The centripetal force acting on a body rotating at a certain radius is given by , where
m = mass of the body,
r = radius of rotation and
= angular velocity of the body.
The angular velocity of a body is given by , where
T is the Time period or time the body takes to complete one rotation.
Step by stepSolved in 2 steps with 1 images
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- Need help with a 2 part problem. Please help thanksarrow_forward18 please need help, keep in mind the 7 basic units and watch the sig figs. Please write in standard form need to see all the numbers in solution thank you so mucharrow_forward1. The tolerance is -+1 in the 3rd significant digitarrow_forward
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