Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 22P
To determine
The vertical force exerted by the air on the airplane.
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The two barges shown here are coupled by a cable of negligible mass. The mass of the front barge is 2.00 × 103 kg and the mass of the rear barge is 3.00 × 103 kg. A tugboat pulls the front barge with a horizontal force of magnitude 20.0 × 103 N, and the frictional forces of the water on the front and rear barges are 8.00 × 103 N and 10.0 × 103 N, respectively. Find the horizontal acceleration of the barges and the tension in the connecting cable.
A person is doing leg lifts with 3.00-kg ankle weights. The lower leg itself has a mass of 5.00 kg. When the leg is held still at an angle of 30.0° with respect to the horizontal, the patellar tendon pulls on the tibia with a force of 362 N at an angle of 20.0° with respect to the lower leg. Assume the force exerted on the tibia by the femur is the only other significant force acting on the lower leg.
a.)Find the magnitude of the force exerted on the tibia by the femur.
b.)At what angle below the horizontal does the force exerted on the tibia by the femur act? Enter the angle in degrees where positive indicates right of the horizontal and negative indicates left of the horizontal.
An advertisement claims that a particular automobile can “stop on a dime.” What net force would be necessary to stop a 850 kg automobile traveling initially at 45.0 km/h in a distance equal to the diameter of a dime, 1.8 cm?
Chapter 4 Solutions
Physics Fundamentals
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