College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 9, Problem 5CQ
Mechanics put a length of Pipe over the handle of a wrench to remove when trying to remove a very tight bolt. How does this help? (It is also hazardous since it can bleak the bolt.)
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Chapter 9 Solutions
College Physics
Ch. 9 - What can you say about the velocity of a moving...Ch. 9 - Under what conditions can a rotating body be in...Ch. 9 - What three factors affect the torque created by a...Ch. 9 - A wrecking ball is being used to knock down a...Ch. 9 - Mechanics put a length of Pipe over the handle of...Ch. 9 - A round pencil lying on its side as in Figure 9.13...Ch. 9 - Explain the need for tall towers on a suspension...Ch. 9 - When visiting some countries, you may see a person...Ch. 9 - Scissors are like a double-lever "Stem, Which of...Ch. 9 - Suppose you pull a nail at a constant rate using a...
Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Why are the forces exerted on the outside world by...Ch. 9 - Explain why the forces in our joints are several...Ch. 9 - Certain of dinosaurs were bipedal (walked on two...Ch. 9 - Swimmers and athletes during competition need to...Ch. 9 - If the maximum force the biceps muscle can exert...Ch. 9 - Suppose the biceps muscle was attached through...Ch. 9 - Explain one of the reasons why pregnant women...Ch. 9 - (a) When opening a door, you push on it...Ch. 9 - When tightening a bolt, you push perpendicularly...Ch. 9 - Two children push on opposite sides of a door...Ch. 9 - Use the second condition for equilibrium (net =0 )...Ch. 9 - Repeat the seesaw problem in Example 9.1 with the...Ch. 9 - Suppose a horse leans against a wall as in Figure...Ch. 9 - Two children of mass 20.0 kg and 30.0 kg sit...Ch. 9 - (a) Calculate the magnitude and direction of the...Ch. 9 - A person carries a plank of wood 2.00 m long with...Ch. 9 - A 17.0-m-high and 11.0-m-long wall under...Ch. 9 - (a) What force must be exerted by the wind to...Ch. 9 - Suppose the weight of the drawbridge in Figure...Ch. 9 - Suppose a 900-kg car is on the bridge in Figure...Ch. 9 - A sandwich board advertising sign is constructed...Ch. 9 - (a) What minimum coefficient of friction is needed...Ch. 9 - A gymnast is attempting to perform splits. From...Ch. 9 - To get up on the roof, a person (mass 70.0 kg)...Ch. 9 - In Figure 9.21, the cg of the pole held by the...Ch. 9 - What is the mechanical advantage of a nail puller...Ch. 9 - Suppose you needed to raise a 250-kg mower a...Ch. 9 - a) What is the mechanical advantage of a...Ch. 9 - A typical car has an axle with 1.10 cm radius...Ch. 9 - What force does the nail puller in Exercise 9.19...Ch. 9 - If you used an ideal pulley of the type shown in...Ch. 9 - Repeat Exercise 9.24 for the pulley shown in...Ch. 9 - Verity that the force in the elbow joint in...Ch. 9 - Two muscles in the back of the leg pull on the...Ch. 9 - The upper leg muscle (quadriceps) exerts a force...Ch. 9 - A device for exercising the upper leg muscle is...Ch. 9 - A person working at a drafting board may hold her...Ch. 9 - We analyzed the biceps muscle example with the...Ch. 9 - Even when the head is held erect, as in Figure...Ch. 9 - A 75-kg man stands on his toes by exerting an...Ch. 9 - A father lifts his child as shown in Figure 9.43....Ch. 9 - Unlike most of the other muscles in our bodies,...Ch. 9 - Integrated Concepts Suppose we replace the 4.0-kg...Ch. 9 - (a) What force should the woman in Figure 9.45...Ch. 9 - You have just planted a sturdy 2-m-tall palm tree...Ch. 9 - Unreasonable Results Suppose two children are...Ch. 9 - Construct Your Own Problem Consider a method for...
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- The cylindrical head bolts on a car are to be tightened with a torque of 62.0Nm . If a mechanic uses a wrench of length 20 cm, what perpendicular force must he exert on the end of the wrench to tighten a bolt correctly?arrow_forwardWhen reducing the mass of a racing bike, the greatest benefit is realized from reducing the mass of the tires and wheel rims. Why does this allow a racer to achieve greater accelerations than would an identical reduction in the mass of the bicycle’s frame?arrow_forwardA screwdriver with a thick handle requires less force to operate than one with a skinny handle. Why?arrow_forward
- Let’s say I have a two-mass system attached to string. The string is massless and frictionless and it passes through narrow hole at center of table. m1 is on horizontal, frictionless surface moving about table and m2 is hanging vertically(stationary). How would I classify conservation of energy, linear momentum, and angular momentum of system. Explain corresponding conservations it has and why.arrow_forwardPut a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you will multiply the torque by (Hint: wrench handle twice long means lever arm is twice) A. two B. eight C. four D. threearrow_forwardA youngster who has entered a soapbox derby (in which 4-wheel unpowered vehicles roll from rest down a hill) asks if large massive wheels or lightweight ones should be used. Also, should the wheels have spokes or be solid? What advice do you offer?arrow_forward
- Treat the upper limb as one segment with a centre of mass 35.6 cm from the shoulder joint. The upper limb has a mass of 4.5 kg. Calculate the moment of force created by the upper limbarrow_forwardIf the couple moment acting on the pipe has a magnitude of 300 N ⋅ m, determine the magnitude F of the forces applied to the wrenches.arrow_forwardA robotic arm lifts a barrel of radioactive waste, as shown in the figure. If the maximum torque delivered by the arm about the axis ? is 4.00×103 N·m and the distance ? is 4.00 m, what is the maximum mass ? of the barrel?arrow_forward
- The cylinder head bolts on a car are to be tightened with a torque of 62.0 N⋅m. If a mechanic uses a wrench of length 20 cm, The perpendicular force must he exert on the end of the wrench to tighten a bolt correctly is Blank 1.arrow_forwardA wrench 30 cm long is used by a mechanic to turn a nut. If the force he exerts on the end is 5 newtons. Calculate the moment of the force.arrow_forwardTo loosen the nut, a moment of 50 lb ft should be exerted atthe wrench. Determine the a) angle ? required to exert theminimum amount of force. (No solution for item (a). Justprovide an explanation using concepts on moment). b) Theminimum force F required to loosen the nut.arrow_forward
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