College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 7, Problem 29P

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?

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A woman places her briefcase on the backseat of her car.  As she drives to work, the car negotiates an unbacked curve in the road that can be regarded as an arc of a circle of a radius 62.0 m. While on the curve, the speed of the car is 15 m/s at the instant the briefcase starts to slide across the back seat 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?
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 49.7 m. While on the curve, the speed of the car is 14.3 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?
A bobsled travels along a frictionless track. It crosses the starting line with a speed of v0=3.1 m/s. At an elevation of 21m below the starting line, it takes a turn along a flat section of track (that is not uphill or downhill). This curve is banked and has a radius of curvature of r=14 m. How many times their normal weight will a rider feel when going around this curve?

Chapter 7 Solutions

College Physics

Ch. 7 - A disk rotates about an axis through its center....Ch. 7 - Suppose an alien civilization has a space station...Ch. 7 - If a cars wheels are replaced with wheels of...Ch. 7 - Objects moving along a circular path have a...Ch. 7 - A pendulum consists of a small object called a bob...Ch. 7 - Because of Earths rotation about its axis, you...Ch. 7 - It has been suggested that rotating cylinders...Ch. 7 - Describe the path of a moving object in the event...Ch. 7 - A pail of water can be whirled in a vertical...Ch. 7 - A car of mass m follows a truck of mass 2m around...Ch. 7 - Is it possible for a car to move in a circular...Ch. 7 - A child is practicing for a BMX race. His speed...Ch. 7 - An object executes circular motion with constant...Ch. 7 - Convert (a) 47.0 to radians, (b) 12.0 rad to...Ch. 7 - A bicycle tire is spinning clockwise at 2.50...Ch. 7 - The tires on a new compact car have a diameter of...Ch. 7 - A potters wheel moves uniformly from rest to an...Ch. 7 - A dentists drill starts from rest. After 3.20 s of...Ch. 7 - A centrifuge in a medical laboratory rotates at an...Ch. 7 - A bicyclist starting at rest produces a constant...Ch. 7 - A bicycle is turned upside down while its owner...Ch. 7 - The diameters of the main rotor and tail rotor of...Ch. 7 - The tub of a washer goes into its spin-dry cycle,...Ch. 7 - A car initially traveling at 29.0 m/s undergoes a...Ch. 7 - A 45.0-cm diameter disk rotates with a constant...Ch. 7 - A rotating wheel requires 3.00 s to rotate 37.0...Ch. 7 - An electric motor rotating a workshop grinding...Ch. 7 - A car initially traveling eastward turns north by...Ch. 7 - It has been suggested that rotating cylinders...Ch. 7 - (a) What is the tangential acceleration of a bug...Ch. 7 - An adventurous archeologist (m = 85.0 kg) tries to...Ch. 7 - One end of a cord is fixed and a small 0.500-kg...Ch. 7 - Human centrifuges are used to train military...Ch. 7 - A 55.0-kg ice skater is moving at 4.00 m/s when...Ch. 7 - A 40.0-kg child swings in a swing supported by two...Ch. 7 - A certain light truck can go around a flat curve...Ch. 7 - A sample of blood is placed in a centrifuge of...Ch. 7 - A 50.0-kg child stands at the rim of a...Ch. 7 - A space habitat for a long space voyage consists...Ch. 7 - An air puck of mass m1 = 0.25 kg is tied to a...Ch. 7 - A snowboarder drops from rest into a halfpipe of...Ch. 7 - A woman places her briefcase on the backseat of...Ch. 7 - A pail of water is rotated in a vertical circle of...Ch. 7 - A 40.0-kg child takes a ride on a Ferris wheel...Ch. 7 - Prob. 32PCh. 7 - (a) Find the magnitude of the gravitational force...Ch. 7 - The International Space Station has a mass of 4.19...Ch. 7 - A coordinate system (in meters) is constructed on...Ch. 7 - Prob. 36PCh. 7 - Objects with masses of 200. kg and 500. kg are...Ch. 7 - Use the data of Table 7.3 to find the point...Ch. 7 - Prob. 39PCh. 7 - Two objects attract each other with a...Ch. 7 - Prob. 41PCh. 7 - Prob. 42PCh. 7 - A satellite of Mars, called Phoebus, has an...Ch. 7 - Prob. 44PCh. 7 - A comet has a period of 76.3 years and moves in an...Ch. 7 - Additional Problems A synchronous satellite. which...Ch. 7 - (a) One of the moons of Jupiter, named Io, has an...Ch. 7 - Neutron stars are extremely dense objects that are...Ch. 7 - One method of pitching a softball is called the...Ch. 7 - A digital audio compact disc (CD) carries data...Ch. 7 - An athlete swings a 5.00-kg ball horizontally on...Ch. 7 - The dung beetle is known as one of the strongest...Ch. 7 - Prob. 53APCh. 7 - A 0.400-kg pendulum bob passes through the lowest...Ch. 7 - A car moves at speed v across a bridge made in the...Ch. 7 - Keratinocytes are the most common cells in the...Ch. 7 - Because of Earths rotation about its axis, a point...Ch. 7 - A roller coaster travels in a circular path, (a)...Ch. 7 - In Robert Heinleins The Moon Is a Harsh Mistress,...Ch. 7 - A model airplane of mass 0.750 kg flies with a...Ch. 7 - In a home laundry dryer, a cylindrical tub...Ch. 7 - Casting of molten metal is important in many...Ch. 7 - A skier starts at rest at the top of a large...Ch. 7 - A stuntman whose mass is 70 kg swings from the end...Ch. 7 - Suppose a 1 800-kg car passes over a bump in a...Ch. 7 - The pilot of an airplane executes a constant-speed...Ch. 7 - Prob. 67APCh. 7 - A coin rests 15.0 cm from the center of a...Ch. 7 - A 4.0-kg object is attached to a vertical rod by...Ch. 7 - A 0.275-kg object is swung in a vertical circular...Ch. 7 - (a) A luggage carousel at an airport has the form...Ch. 7 - The maximum lift force on a bat is proportional to...Ch. 7 - In a popular amusement park ride, a rotating...Ch. 7 - A massless spring of constant k = 78.4 N/m is...Ch. 7 - A 0.50-kg ball that is tied to the end of a 1.5-m...
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