Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 5, Problem 11CQ
If a curve is banked, is it possible for a car to negotiate the curve even when the frictional force is zero due to very slick ice? Explain.
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27. Two banked curves have the same radius. Curve A is banked at
an angle of 13°, and curve B is banked at an angle of 19°. A car can
travel around curve A without relying on friction at a speed of 18 m/s.
At what speed can this car travel around curve B without relying on
friction?
A car moving at 41 km/h negotiates a 150 m -radius banked turn designed for 60 km/h .
What coefficient of friction is needed to keep the car on the road?
Express your answer using two significant figures.
Why do you think is possible for a car to turn safely on a banked curve, even though there is no friction?
Chapter 5 Solutions
Physics of Everyday Phenomena
Ch. 5 - Suppose that the speed of a ball moving in a...Ch. 5 - A car travels around a curve with constant speed....Ch. 5 - Two cars travel around the same curve, one at...Ch. 5 - A car travels the same distance at constant speed...Ch. 5 - The centripetal acceleration depends upon the...Ch. 5 - A ball on the end of a string is whirled with...Ch. 5 - Before the string breaks in question 6, is there a...Ch. 5 - For a ball being twirled in a horizontal circle at...Ch. 5 - A car travels around a flat (nonbanked) curve with...Ch. 5 - Is there a maximum speed at which the car in...
Ch. 5 - If a curve is banked, is it possible for a car to...Ch. 5 - If a ball is whirled in a vertical circle with...Ch. 5 - Sketch the forces acting upon a rider on a Ferris...Ch. 5 - Which safety measure, seat belts or air bags,...Ch. 5 - In a head-on collision between two vehicles, is...Ch. 5 - If a car is equipped with air bags, should it be...Ch. 5 - In what way did the heliocentric view of the solar...Ch. 5 - Did Ptolemys view of the solar system require...Ch. 5 - Heliocentric models of the solar system...Ch. 5 - How did Keplers view of the solar system differ...Ch. 5 - Consider the method of drawing an ellipse pictured...Ch. 5 - Does a planet moving in an elliptical orbit about...Ch. 5 - Does the sun exert a larger force on the Earth...Ch. 5 - Is there a net force acting on the planet Earth?...Ch. 5 - Three equal masses are located as shown in the...Ch. 5 - Two masses are separated by a distance r. If this...Ch. 5 - A painter depicts a portion of the night sky as...Ch. 5 - At what times during the day or night would you...Ch. 5 - At what times of the day or night does the...Ch. 5 - Are we normally able to see the new moon? Explain.Ch. 5 - During what phase of the moon can a solar eclipse...Ch. 5 - A synchronous satellite is one that does not move...Ch. 5 - Is Keplers third law valid for artificial...Ch. 5 - Since the Earth rotates on its axis once every 24...Ch. 5 - Prob. 35CQCh. 5 - Prob. 36CQCh. 5 - A ball is traveling at a constant speed of 4 m/s...Ch. 5 - A car rounds a curve with a radius of 40 m at a...Ch. 5 - A ball traveling in a circle with a constant speed...Ch. 5 - How much larger is the required centripetal...Ch. 5 - A 0.35-kg ball moving in a circle at the end of a...Ch. 5 - A car with a mass of 1500 kg is moving around a...Ch. 5 - A car with a mass of 1300 kg travels around a...Ch. 5 - A Ferris wheel at a carnival has a radius of 8 m...Ch. 5 - What is the ratio of the Earths period of rotation...Ch. 5 - Dylan has a weight of 800 N (about 180 lb) when he...Ch. 5 - Two masses are attracted by a gravitational force...Ch. 5 - Two 700-kg masses (1543 lb) are separated by a...Ch. 5 - Two masses are attracted by a gravitational force...Ch. 5 - The acceleration of gravity at the surface of the...Ch. 5 - The acceleration of gravity on the surface of...Ch. 5 - The time separating high tides is 12 hours and 25...Ch. 5 - A 0.25-kg ball is twirled at the end of a string...Ch. 5 - A Ferris wheel with a radius of 15 m makes one...Ch. 5 - A car with a mass of 1100 kg is traveling around a...Ch. 5 - Assume that a passenger in a rollover accident...Ch. 5 - The suns mass is 1.99 1030 kg, the Earths mass is...Ch. 5 - The period of the moons orbit about the Earth is...
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- A car of mass 1 230 kg travels along a circular road of radius 60.0 m at 18.0 m/s. (a) Calculate the magnitude of the cars centripetal acceleration. (b) What is the magnitude of the force of static friction acting on the car? (See Section 7.4.)arrow_forwardAn amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away (Fig. P5.60). The coefficient of static friction between person and wall is s, and the radius of the cylinder is R. (a) Show that the maximum period of revolution necessary to keep the person from falling is T=(42Rs/g)1/2. (b) If the rate of revolution of the cylinder is made to be somewhat larger, what happens to the magnitude of each one of the forces acting on the person? What happens in the motion of the person? (c) If the rate of revolution of the cylinder is instead made to be somewhat smaller, what happens to the magnitude of each one of the forces acting on the person? What happens in the motion of the person?arrow_forwardPart of riding a bicycle involves leaning at the correct angle when making a turn, as seen in Figure 6.36. To be stable, the force exerted by the ground must be on a line going through the center of gravity. The force on the bicycle wheel can be resolved into two perpendicular components—friction parallel to the road (this must supply the centripetal force), and the vertical normal force (which must equal the system's weight). (a) Show that (as defined in the figure) is related to the speed v and radius of curvature r of the turn in the same way as for an ideally banked roadway—that is, =tan1v2/rg (b) Calculate for a 12.0 m/s turn of radius 30.0 m (as in a race). Figure 6.36 A bicyclist negotiating a turn on level ground must lean at the correct angle—the ability to do this becomes instinctive. The force of the ground on the wheel needs to be on a line through the center of gravity. The net external force on the system is the centripetal force. The vertical component of the force on the wheel cancels the weight of the system while its horizontal component must supply the centripetal force. This process produces a relationship among the angle , the speed v, and the radius of curvature r of the turn similar to that for the ideal banking of roadways.arrow_forward
- A car rounds a banked curve as discussed in Example 6.4 and shown in Figure 6.5. The radius of curvature of the road is R, the banking angle is , and the coefficient of static friction is s. (a) Determine the range of speeds the car can have without slipping up or down the road. (b) Find the minimum value for s such that the minimum speed is zero.arrow_forwardIf centripetal force is directed toward the center, why do you feel that you are ‘thrown’ away from the center as a car goes around a curve? Explain.arrow_forwardA crate of eggs is located in the middle of the flatbed of a pickup truck as the truck negotiates a curve in the flat road. The curve may be regarded as an arc of a circle of radius 35.0 m. If the coefficient of static friction between crate and truck is 0.600, how fast can the truck be moving without the crate sliding?arrow_forward
- A door in a hospital has a pneumatic closer that pulls the door shut such that the doorknob moves with constant speed over most of its path. In this part of its motion, (a) does the doorknob experience a centripetal acceleration? (b) Does it experience a tangential acceleration?arrow_forwardIf the radius of the path of a body in uniform circular motion is doubled and the speed is kept the same the force needed must be A (a) half as great as before. B) (b) the same as before. (c) twice as large as before. D (d) four times the size as before. E E. No answerarrow_forwardA motor vehicle of mass 2000 kg travels round a curved path of radius 55 m. the coefficient of friction between the tyres and the road surface is 0.75. The track of the vehicle is 1.5 m and the centre of gravity is 70 cm above ground level. Calculate the maximum speed at which the vehicle can travel round the curve: i. without skidding outwards ii. without overturning iii. if the angle of tilt is 300 without overturningarrow_forward
- A 2000 kg car rounds a curve of radius 70 m banked at an angle of 12°. If the car is traveling at 95 km/h, will a friction force be required? If so, how much and in what direction? with explanation pleasearrow_forward13) If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). (a) Calculate the ideal speed in (m/s) to take a 110 m radius curve banked at 15°. _____ m/s (b) What is the minimum coefficient of friction needed for a frightened driver to take the same curve at 20.0 km/h?arrow_forwardIf centripetal force is directed toward the center of curvature, why do you feel as if you are “thrown” away from the center as a car goes around a curve? Explain.arrow_forward
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