College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 5, Problem 3CQ
When you learn to drive, you discover that you need to up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and friction.
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You are sitting on the edge of a horizontal disk (for example, a playground merry-go-round) that has radius 3.00 mm and is rotating at a constant rate about a vertical axis. The coefficient of static friction between you and the surface of the disk is 0.430.
a) What is the minimum time for one revolution of the disk if you are not to slide off?
b) Your friend's weight is half yours. If the coefficient of static friction for him is the same as for you, what is the minimum time for one revolution if he is not to slide off?
11
What is the smallest radius of an unbanked (flat) track around which a bicyclist can travel if her speed is 24.6 km/h and the coefficient
of static friction between tires and track is 0.357?
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Chapter 5 Solutions
College Physics
Ch. 5 - Define normal force. What is its relationship to...Ch. 5 - The glue on a piece of tape can exert forces. Can...Ch. 5 - When you learn to drive, you discover that you...Ch. 5 - When you push a piece of chalk across a...Ch. 5 - Athletes such as swimmers and bicyclists wear body...Ch. 5 - Two expressions were used for the drag force...Ch. 5 - As cars travel, oil and gasoline leaks onto the...Ch. 5 - Why can a squirrel jump from a tree branch to the...Ch. 5 - The elastic properties of the arteries are...Ch. 5 - What are you feeling when you feel your pulse?...
Ch. 5 - Examine different types of shoes, including sports...Ch. 5 - Would you expect your height to be different...Ch. 5 - Why can a squirrel from a tree branch to the...Ch. 5 - Explain why pregnant women often suffer from back...Ch. 5 - An old carpenter's trick to keep nails from...Ch. 5 - When a glass bottle full of vinegar warms up, both...Ch. 5 - A physics major is cooking breakfast when he...Ch. 5 - (a) When rebuilding her car's engine, a physics...Ch. 5 - (a) What is the maximum frictional force in the...Ch. 5 - Suppose you have a 120-kg wooden crate resting on...Ch. 5 - (a) If half of the weight of a small 1.00103 kg...Ch. 5 - A team of eight dogs pulls a sled with waxed wood...Ch. 5 - Consider the 65.0-kg ice skater being pushed by...Ch. 5 - Show that the acceleration of any object down a...Ch. 5 - Show that the acceleration of any object down an...Ch. 5 - Calculate the deceleration of a snow boarder going...Ch. 5 - (a) Calculate the acceleration of a skier heading...Ch. 5 - If an object is to rest on an incline without...Ch. 5 - Calculate the maximum deceleration of a car that...Ch. 5 - Calculate the maximum acceleration of a car that...Ch. 5 - Repeat Exercise 5.14 for a car with four-wheel...Ch. 5 - A freight train consists of two 8.00105 -kg...Ch. 5 - Consider the 52.0-kg mountain climber in Figure...Ch. 5 - A contestant in a winter sporting event pushes a...Ch. 5 - Repeat Exercise 5.18 with the contestant pulling...Ch. 5 - The terminal velocity of a person falling in air...Ch. 5 - A 60-kg and a go-kg skydiver jump from an airplane...Ch. 5 - A 560-g squirrel with a surface area of 930 cm2...Ch. 5 - To maintain a constant speed, the force provided...Ch. 5 - By what factor does the drag force on a car...Ch. 5 - Calculate the speed a spherical rain drop would...Ch. 5 - Using Stokes' law, verify that the units for...Ch. 5 - Find the terminal velocity of a spherical...Ch. 5 - Stokes' law describes sedimentation of particles...Ch. 5 - During a circus act, one performer swings upside...Ch. 5 - During a wrestling match, a 150 kg wrestler...Ch. 5 - (a) The "lead" in pencils is a graphite...Ch. 5 - TV broadcast antennas are the tallest artificial...Ch. 5 - (a) By how much does a 65.0-kg mountain climber...Ch. 5 - A 20.0-m tall hollow aluminum flagpole is...Ch. 5 - As an oil well is drilled, each new section of...Ch. 5 - Calculate the force a piano tuner applies to...Ch. 5 - A vertebra is subjected to a shearing force of 500...Ch. 5 - A disk between vertebrae in the spine is subjected...Ch. 5 - When using a pencil eraser, you exert a vertical...Ch. 5 - To consider the effect of wires hung on poles, we...Ch. 5 - A farmer making grape juice fills a glass bottle...Ch. 5 - (a) When water freezes, its volume increases by...Ch. 5 - This problem returns to the tightrope walker...Ch. 5 - The pole in Figure 5.24 is at a 90.0° bend in a...
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- Lisa measured the coefficient of static friction between two pairs of running shoes and the track in Example 6.1 (page 159). If she wants to have an advantage in a race, which shoes should she wear, the ones with a high coefficient or the ones with the low coefficient of static friction? Explain.arrow_forward(a) Estimate the terminal speed of a wooden sphere (density 0.830 g/cm3) falling through air, taking its radius as 8.00 cm and its drag coefficient as 0.500. (b) From what height would a freely falling object reach this speed in the absence of air resistance?arrow_forwardThe drag coefficient C in FD=12CAv2 (Eq. 6.5) depends primarily on the shape of the object. You already have developed an intuition about what shapes correspond to a low C by observing the shapes of aerodynamic cars, boats, and even bullets. Which object, a sphere or a cube, would have a larger drag coefficient, assuming they are nearly the same size? Explain your reasoning. What aspect of an object most determines its drag coefficient?arrow_forward
- A 0.500-kg potato is fired at an angle of 80.0 above the horizontal from a PVC pipe used as a “potato gun” and reaches a height of 110.0 m. (a) Neglecting air resistance, calculate the potato’s velocity when it leaves the gun. (b) The gun itself is a tube 0.430 m long. Calculate the average acceleration of the potato in the tube as it goes from zero to the velocity found in (a). (c) What is the average force on the potato in the gun? Express your answer in newtons and as a ratio to the weight of the potato.arrow_forwardCASE STUDY In the train collision case study (Chapter 5, page 119), we ignored the drag force on the trains. Estimate the drag on the trains and compare it to the kinetic friction on them. Is it okay to ignore drag? Explain.arrow_forwardAn automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forward
- A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?arrow_forwardA book with initial velocity 4.46m/s. if the coefficient of kinetic friction between the book and the horizontal floor is 0.4, how far (in meters) will the book slide before coming to rest?arrow_forwardQ 2: In the system shown in the figure. When a vertical force F-500N acts on the point A, determine the smallest force P that must be applied to push the wedge to left. Knowing that the coefficient of static friction between wedge and all contact surface is u=0.2. and also the weight of the wedge and rod is neglected. 500 N 300 mm 40 mm 40 mm D 500 mmarrow_forward
- 2. You are working as a letter sorter in a U.S Post Office. Postal R regulations require that employees' footwear must have a minimum coefficient of static friction of 0.5 on a speci- fied tile surface. You are wearing athletic shoes for which you do not know the coefficient of static friction. In order |Screen Shot 2020-10-21 at 01.48.25 Q Search to determine the coefficient, you imagine that there is an emergency and start running across the room. You have a coworker time you, and find that you can begin at rest and move 4.23 m in 1.20 s. If you try to move faster than this, your feet slip. Assuming your acceleration is constant, does your footwear qualify for the postal regulation?arrow_forwardIn about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the other side (see the figure). Sincosky's mass was 79.0 kg. If the coefficient of static friction between hand and rafter was 0.720, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers?arrow_forwardCurrent Attempt in Progress The drawing shows a baggage carousel at an airport. Your suitcase has not slid all the way down the slope and is going around at a constant speed on a circle ((r= 11.0 m) as the carousel turns. The coefficient of static friction between the suitcase and the carousel is 0.520, and the angle in the drawing is 7.45°. How much time is required for your suitcase to go around once? Assumme that the static friction between the suitcase and the carousel is at its maximum. Number Unitsarrow_forward
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