FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119803645
Author: Sonntag
Publisher: WILEY
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Chapter 1, Problem 1.24P
One of the people in the previous problem weighs
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A car is hanging over a hole, supported by a rope tied to the ceiling and a person pulling the rope.
How much force is exerted by the person in the configuration below, given the car weighs 3500
lbs?
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Assume the image below is your arm and you are lifting a 15 lb weight. your arm is now at a 50-degree angle to your body. The force from the muscle is vertical. The weight of your arm is 5 lbs. dbiceps is 2cm and dball is 6cm.
Please draw a free body diagram of the arm at that 50-degree angle with the forces.
What is the force that the muscle puts on the arm?
What is the force from the muscle if the weight is all the way up?
Trina is a gym goer with a leg length of 84 cm. Suppose that she is in the gym doing straight legraising with 10 lb weights.
Compute for the force that the muscle should exert in order to (1) maintain it in the position and(2) lift the weight up given that the distance of the effort (muscle) from the joint is 54 cm,distance of the weight is 80 cm, and the COM is 45 cm from the joint.
ANSWER THE QUESTION:
1.) Assuming that the leg moves at 0. 9 seconds, compute for the angular velocity.
GIVEN:
Leg length = 84 cm = 0.84 m
Distance of the muscle from the joint = 54 cm = 0.54 m
Distance of the weight = 80 cm = 0.80 m
Distance of the COM from the joint = 45 cm = 0.45 m
Mass = 10 lb = 4.535 kg
Linear displacement x = 38.971 cm Or x = 0.389 m
Chapter 1 Solutions
FUNDAMENTALS OF THERMODYNAMICS
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