3rd Edition

ISBN: 9780135213346

Author: Hewitt

Publisher: PEARSON CO

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Textbook Question

Chapter 4, Problem 41PC

Calculate the impulse that occurs when an average force of 10 N is exerted on a cart for 5 s .

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Chapter 4, Problem 40PC

Chapter 4, Problem 42PC

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The force of the quadriceps (Fq) and force of the patellar tendon (Fp) is identical (i.e., 1000 N each). In the figure below angle in blue is Θ and the in green is half Θ (i.e., Θ/2). A) Calculate the patellar reaction force (i.e., R resultant vector is the sum of the horizontal component of the quadriceps and patellar tendon force) at the following joint angles: you need to provide a diagram showing the vector and its components for each part. a1) Θ = 160 degrees, a2) Θ = 90 degrees. NOTE: USE ONLY TRIGNOMETRIC FUNCTIONS (SIN/TAN/COS, NO LAW OF COSINES, NO COMPLICATED ALGEBRAIC EQUATIONS OR ANYTHING ELSE, ETC. Question A has 2 parts!

The force of the quadriceps (Fq) and force of the patellar tendon (Fp) is identical (i.e., 1000 N each). In the figure below angle in blue is Θ and the in green is half Θ (i.e., Θ/2). A) Calculate the patellar reaction force (i.e., R resultant vector is the sum of the horizontal component of the quadriceps and patellar tendon force) at the following joint angles: you need to provide a diagram showing the vector and its components for each part. a1) Θ = 160 degrees, a2) Θ = 90 degrees. NOTE: USE DO NOT USE LAW OF COSINES, NO COMPLICATED ALGEBRAIC EQUATIONS OR ANYTHING ELSE, ETC. Question A has 2 parts!

Chapter 4 Solutions

EP CONCEPTUAL INTEGRATED SCIENCE-ACCESS

Ch. 4 - Which has a greater momentum-a heavy truck at rest...Ch. 4 - How can a huge ship have an enormous momentum when...Ch. 4 - How does impulse differ from force?Ch. 4 - What are the two ways in which the impulse exerted...Ch. 4 - For the same force, which cannon imparts the...Ch. 4 - Consider a baseball that is caught and thrown at...Ch. 4 - In the preceding question, which case requires the...Ch. 4 - Can you produce a net impulse on an automobile by...Ch. 4 - What does it mean to say that a quantity is...Ch. 4 - Distinguish between an elastic collision and an...

Ch. 4 - Railroad car A rolls at a certain speed and...Ch. 4 - If the equally massive cars of the preceding...Ch. 4 - When is energy most evident?Ch. 4 - What do we call the quantity force distance, and...Ch. 4 - In what units are work and energy measured?Ch. 4 - True or false: One watt is the unit of power...Ch. 4 - How many watts of power are expended when a force...Ch. 4 - A car is lifted a certain distance in a service...Ch. 4 - Two cars, one twice as heavy as the other, are...Ch. 4 - When a car travels at 50 km/h, it has kinetic...Ch. 4 - What is the evidence for saying whether or not...Ch. 4 - The brakes do a certain amount of work to stop a...Ch. 4 - Cite the law of energy conservation.Ch. 4 - What is the source of energy that powers a...Ch. 4 - Can a machine multiply input force? 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Show...Ch. 4 - A railroad diesel engine weighs four times as much...Ch. 4 - A 5kg fish swimming at 1m/s swallows an absent...Ch. 4 - What would be the speed of the larger fish if the...Ch. 4 - Jeannie Beanie mass 40kg, standing on a slippery...Ch. 4 - Consider the inelastic collision between the two...Ch. 4 - This question is typical on some drivers licence...Ch. 4 - In the hydraulic machine shown, it is observed...Ch. 4 - Consider a car with 25% efficient engine that and...Ch. 4 - When a cyclist expends 1000W of power to deliver...Ch. 4 - The decrease in PE of a freely falling object...Ch. 4 - A Mars vehicle is tested on Earth at a speed of...Ch. 4 - How can the momentum of a speeding bullet be the...Ch. 4 - Distinguish between force and impulse. .Ch. 4 - What are the two ways to increase or decrease...Ch. 4 - Why are automobiles designed to crumple upon...Ch. 4 - Why might a glass wine survive a fall onto a...Ch. 4 - If you throw an egg against a wall, the egg will...Ch. 4 - Railroad cars are loosely coupled so that there is...Ch. 4 - When a cannon with a long barrel is fired, the...Ch. 4 - Why does Howies block Figure 4.3 topple when the...Ch. 4 - You are on small raft next to a dock, and you jump...Ch. 4 - When travelling in your car at highway speed, the...Ch. 4 - Freddy Frog drops vertically from a tree onto a...Ch. 4 - Prob. 81TE Ch. 4 - Can something have energy without having momentum?...Ch. 4 - Which requires more work: stretching a strong...Ch. 4 - Why do you run out of breath when running up the...Ch. 4 - Distinguish between work and power.Ch. 4 - Relative to the floor in a library, books on the...Ch. 4 - If 300 joules is required to lift an object to a...Ch. 4 - When the velocity of an object is doubled, by what...Ch. 4 - You and a flight attended tosses a ball back and...Ch. 4 - A child can throw a baseball at 20 mph. Some...Ch. 4 - Prob. 91TE Ch. 4 - When a cannon with a long barrel is fired, the...Ch. 4 - Consider a pendulum swinging to and fro. At what...Ch. 4 - A physics instructor demonstrates energy...Ch. 4 - An apple hanging from a limb has potential energy...Ch. 4 - In an effort to combat wasteful habits, we often...Ch. 4 - Why bother using a machine if it cannot multiply...Ch. 4 - In the ideal pulley system shown, Block A has mass...Ch. 4 - Why is a punch more powerful with a bare fist than...Ch. 4 - A boxer can punch a heavy bag for more than an...Ch. 4 - A fully dressed person is at rest in the middle of...Ch. 4 - Why is it difficult for a firefighter to hold a...Ch. 4 - If a Mack truck and Honda Civic have a head-on...Ch. 4 - If an automobile has an engine that was 100%...Ch. 4 - Discuss the design of the roller coaster shown in...Ch. 4 - Consider the identical balls released from rest on...Ch. 4 - Consider the swinging balls apparatus shown. If...Ch. 4 - A freight train rolls along a track with...Ch. 4 - If Fast Freda doubles her running speed, she also...Ch. 4 - A big fish swims upon and swallows a small fish at...Ch. 4 - Which of these equations best illustrates the...Ch. 4 - Which of these equations is best for calculating...Ch. 4 - The power required to raise a 100-kg crate a...Ch. 4 - A model car with three times as much speed as...Ch. 4 - Nellie lifts a 100-N crate with an ideal pulley...Ch. 4 - When 100 J are put into a device that puts out 40...Ch. 4 - A simple machine CANNOT multiply a force. b...

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