COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 63QAP
To determine
Centripetal acceleration of one proton
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Disturbed by speeding cars outside his workplace, Nobel laureate Arthur Holly Compton designed a speed bump (called the "Holly hump") and had it installed. Suppose a 1800-kg car passes over a hump in a roadway that follows the arc of a circle of radius 21.2 m
(a) If the car travels at 29.8 km/h what force does the road exert on the car as the car passes the highest point of the hump what is the magnitude and direction
(b) What is the maximum speed the car can have without losing contact with the road as it passes this highest point?
7. Two cars are traveling around identical circular circuits. A car A travels at a constant speed of 20 m / s. Car B starts at rest and accelerates with constant tangential acceleration until its speed is 40 m / s. When car B has the same (tangential) speed as car A, it is always true that:
choose an asnwer
A-)it is passed to car A.
B-)has the same linear (tangential) acceleration as car A.
C-)has the same centripetal acceleration as car A.
D-) has the same total acceleration as car A ..
E-)has traveled further than the car A from the start.
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.20 x 106 m/s. Find (a) the force acting on the electron as it revolves in a circular orbit of radius 0.529 x 10-10 m and (b) the centripetal acceleration of the electron.
Chapter 5 Solutions
COLLEGE PHYSICS
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- A car traveling on a flat (unbanked), circular track accelerates uniformly from rest with a tangential acceleration of a. The car makes it one-quarter of the way around the circle before it skirts oil the track. Front these data, determine the coefficient of static friction between the car and the track.arrow_forwardA student builds and calibrates an accelerometer and uses it to determine the speed of her car around a certain unbanked highway curve. The accelerometer is a plumb bob with a protractor that she attaches to the roof of her car. A friend riding in the car with the student observes that the plumb bob hangs at an angle of 15.0 from the vertical when the car has a speed of 23.0 m/s. (a) What is the centripetal acceleration of the car rounding the curve? (b) What is the radius of the curve? (c) What is the speed of the car if the plumb bob deflection is 9.00 while rounding the same curve?arrow_forwardAn ordinary workshop grindstone has a radius of 7.50 cm and rotates at 6500 rev/min. (a) Calculate the magnitude of the centripetal acceleration at its edge in meters per second squared and convert it to multiples of g.arrow_forward
- The Moon and Earth rotate about their common center of mass, which is located about 4700 km from the center of Earth. (This is 1690 km below the surface.) (a) Calculate the magnitude of the acceleration due to the Moon's gravity at that point. (b) Calculate the magnitude of the centripetal acceleration of the center of Earth as it rotates about that point once each lunar month (about 27.3 d) and compare it with the acceleration found in part (a). Comment on whether or not they are equal and why they should or should not be.arrow_forwardA synchronous satellite, which always remains above the same point on a planets equator, is put in orbit around Jupiter to study that planets famous red spot. Jupiter rotates once every 9.84 h. Use the data of Table 13.2 to find the altitude of the satellite above the surface of the planet.arrow_forwardBIO Bubble Net Fishing Humpback whales sometimes catch fish by swimming rapidly in a circle, blowing a curtain of bubbles that confuses a school of fish and traps it in a small area, where the whales can easily catch and eat them. Suppose a 28,000-kg humpback whale swims at 2.2 m/s in a circle of radius 8.5 m. What centripetal force must the whale generate?arrow_forward
- A person whirls a 0.250-kg stone in a 1.00-m-radius horizontal circle at the end of a string. The horizontal component of the force with which the person pulls on the string is 5.00 N. Write expressions for the projections of the displacement, velocity, and acceleration on a diameter of the circle.arrow_forwardWhen a fighter pilot makes a very quick turn, he experiences a centripetal acceleration. When this acceleration is greater than about 4 × g the pilot will usually lose consciousness (“black out”). Consider a pilot flying at a speed of 950 m/s who wants to make a very sharp turn. What is the minimum radius of curvature that he can take without blacking out?arrow_forward50-kg child riding a Ferris wheel (radius = 10 cm) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?arrow_forward
- A car travels with a constant velocity of 80km/h and makes a left turn into a circular road. A dice is hanging from a string connected to the roof of the car. When the car makes the turn the dice form a 15-degree angle with the plumb line. a) Find the radius of the left turn. The coefficient of friction between the road and the wheels are 0,75. b) What is the greatest speed the car can have through the turn without losing traction?arrow_forwardA 1200 kg car rounds a level freeway exit turn of radius 40m at constant speed of 20m/s. What is the net force on the car as a vector? Choose your own coordinate system that seems appropriate.arrow_forwardA race car starts from rest on a circular track. The carincreases its speed at a constant rate at as it goes oncearound the track. Find the angle that the total accelera-tion of the car makes—with the radius connecting thecenter of the track and the car—at the moment the carcompletes the circle.arrow_forward
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