Which statement below is incorrect with regard to curved roads? Racetracks have banked turns so cars do not have to slow down too much when navigating them Given several turns of the same radius, made of the same material but at different bank angles, the one which could be navigated at the highest speed would the one with the steepest bank. 4 wheel drive allows one to drive faster around turns in the winter If made of the same material and under the same conditions, a banked curve can always be navigated at a higher speed than a flat curve of the same radius. A banked turn can be navigated safely even if completely covered in ice

Which statement below is incorrect with regard to curved roads? Racetracks have banked turns so cars do not have to slow down too much when navigating them Given several turns of the same radius, made of the same material but at different bank angles, the one which could be navigated at the highest speed would the one with the steepest bank. 4 wheel drive allows one to drive faster around turns in the winter If made of the same material and under the same conditions, a banked curve can always be navigated at a higher speed than a flat curve of the same radius. A banked turn can be navigated safely even if completely covered in ice

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter4: Motion In Two And Three Dimensions

Section: Chapter Questions

Problem 64P: A runner taking part in the 200-m dash must run around the end of a track that has a circular arc...

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An office door is given a sharp push and swings open against a pneumatic device that slows the door down and then reverses its motion. At the moment the door is open the widest, (a) does the doorknob have a centripetal acceleration? (b) Does it have a tangential acceleration?
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?
A runner taking part in the 200-m dash must run around the end of a track that has a circular arc with a radius of curvature of 30.0 m. The runner starts the race at a constant speed. If she completes the 200-m dash in 23.2s and rum at constant speed throughout the race, what is her centripetal acceleration as she runs the curved portion of the track?
A 30.O-g ball at the end of a stung is swung in a vertical circle with a radius of 25.0 m. The rotational velocity Is 200.0 cm/s. Find the tension in the string: (a) at the top of the circle, (b) at the bottom of the circle, and (c) at a distance of 12.5 cm from the center of the circle (r=12.5cm).
A fairground ride spins its occupants inside a flying saucer-shaped container. If the horizontal circular path the riders follow has an 8.00-m radius, at how many revolutions per minute are the riders subjected to a centripetal acceleration equal to that of gravity?
A woman places her briefcase on the backseat of her car. As she drives to work, the car negotiates an unbanked curve in the road that can be regarded as an arc of a circle of radius 62.0 m. While on the curve, the speed of the car is 15.0 m/s at the instant the briefcase starts to slide across the backseat toward the side of the car. (a) What force causes the centripetal acceleration of the briefcase when it is stationary relative to the car? Under what condition does the briefcase begin to move relative to the car? (b) What is the coefficient of static friction between the briefcase and seat surface?
Why does banking a curve on a highway allow a vehicle to successfully negotiate the turn at a higher speed?
If 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.
What is the ideal speed to take a 100.0-m-radius curve banked at a 20.0angle?
Modem roller coasters have vertical loops like the one shown here. The radius of curvature is smaller at the top than on the sides so that the downward centripetal acceleration at the top will be greater than the acceleration due to gravity, keeping the passengers pressed firmly into their seats. (a) What is the speed of the roller coaster at the top of the loop if the radius of curvature there is 15.0 m and the downward acceleration of the car is 1.50 g ? (b) How high above the top of the loop must the roller coaster start from rest, assuming negligible friction? (c) If it actually starts 5.00 m higher than your answer to (b), how much energy did it lose to friction? Its mass is 1.50103kg .
4. The driver of a 1300kg car wants to turn a corner of radius 57m at a speed of 12m/s. (a) What is therequired centripetal force? (b) What is the necessary coefficient of friction to provide this force?
Suppose the car in the previous question tries to complete the turn with tires that provide a coefficientof friction of 2.1 between the tires and the level road surface. What is the maximum speed of the car as itsuccessfully turns? Previous Question: 4. The driver of a 1300kg car wants to turn a corner of radius 57m at a speed of 12m/s. (a) What is therequired centripetal force? (b) What is the necessary coefficient of friction to provide this force?