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Circular Motion A 1200-kilogram car traveling at a constant speed of 9.0 m/s turns at an intersection. The car follows a horizontal circular path with a radius of 25 meters to point P. At point P, the car hits an area of ice and loses all frictional force on its tires. Which path does the car follow on the ice? A) A B) B C) C D) D A ball attached to a string is moved at constant speed in a horizontal circular path. A target is located near the path of the ball as shown in the diagram. At which point along the ball’s path should the string be released, if the ball is to hit the target? A) A B) B C) C D) D An artificial satellite makes 4 complete revolutions about the Earth in 8 hours. The period of revolution of the satellite is A) ½ hour B) 2 hours C) 8 hours D) 32 hours Centripetal Acceleration & Force If the velocity of a car traveling around a circular track doubles, its centripetal acceleration would be A) 1/2 as great B) 2 times greater C) 1/4 as great D) 4 times greater The diagram below shows the elliptical orbit of a comet around the Sun. The magnitude of the centripetal acceleration of the comet is greatest at point A) A B) B C) C D) D A car moves with a constant speed in a clockwise direction around a circular path of radius r, as represented in the diagram above. When the car is in the position shown, its acceleration is directed toward the A) north B) west C) south D) east The magnitude of the centripetal force acting on an object traveling in a horizontal, circular path will decrease if the A) radius of the path is increased B) mass of the object is increased C) direction of motion of the object is reversed D) speed of the object is increased The centripetal force acting on the space shuttle as it orbits Earth is equal to the shuttle’s A) inertia B) momentum C) velocity D) weight Centripetal force Fc acts on a car going around a curve. If the speed of the car were twice as great, the magnitude of the centripetal force necessary to keep the car moving in the same path would be A) Fc B) 2Fc C) Fc/2 D) 4Fc The diagram below represents a mass, m, being swung clockwise at constant speed in a horizontal circle. At the instant shown, the centripetal force acting on mass m is directed toward point A) A B) B C) C D) D A 0.50-kilogram object moves in a horizontal circular path with a radius of 0.25 meter at a constant speed of 4.0 m/s. What is the magnitude of the object’s acceleration? A) 8.0 m/s2 B) 16 m/s2 C) 32 m/s2 D) 64 m/s2 A 0.50-kilogram object moves in a horizontal circular path with a radius of 0.25 meter at a constant speed of 4.0 m/s. What is the magnitude of the object’s centripetal force? A 0.40-kilogram stone is attached to a string. The stone is moving at a constant speed of 4.0 m/s in a horizontal circle with a radius of 0.80 m. The magnitude of the centripetal acceleration of the stone is A) 0.0 m/s2 B) 2.0 m/s2 C) 5.0 m/s2 D) 20. m/s2 A 2.0 × 103-kilogram car travels at a constant speed of 12 m/s around a circular curve of radius 30 meters. What is the magnitude of the centripetal acceleration of the car as it goes around the curve? A) 0.40 m/s2 B) 4.8 m/s2 C) 800 m/s2 D) 9,600 m/s2 In an experiment, a 0.028-kilogram rubber stopper is attached to one end of a string. A student whirls the stopper overhead in a horizontal circle with a radius of 1.0 meter. The stopper completes 10 revolutions in 10 seconds. Calculate the magnitude of the angular speed or frequency of the stopper. In an experiment, a 0.028-kilogram rubber stopper is attached to one end of a string. A student whirls the stopper overhead in a horizontal circle with a radius of 1.0 meter. The stopper completes 10 revolutions in 10 seconds. Calculate the magnitude of the linear or tangential speed of the whirling stopper. In an experiment, a 0.028-kilogram rubber stopper is attached to one end of a string. A student whirls the stopper overhead in a horizontal circle with a radius of 1.0 meter. The stopper completes 10 revolutions in 10 seconds. Calculate the magnitude of the centripetal acceleration of the whirling stopper. In an experiment, a 0.028-kilogram rubber stopper is attached to one end of a string. A student whirls the stopper overhead in a horizontal circle with a radius of 1.0 meter. The stopper completes 10 revolutions in 10 seconds. Calculate the magnitude of the centripetal force on the whirling stopper. A mass of 10 kilograms is revolving at a linear speed of 5 meters per second in a circle with a radius of 10 meters. What is the frequency or angular speed (rps) of the mass? A mass of 10 kilograms is revolving at a linear speed of 5 meters per second in a circle with a radius of 10 meters. What is the centripetal acceleration of the mass is A mass of 10 kilograms is revolving at a linear speed of 5 meters per second in a circle with a radius of 10 meters. The centripetal force acting on the mass is A) 5 N C) 20 N B) 10 N D) 25 N A 1750-kilogram car travels at a constant speed of 15.0 m/s around a horizontal, circular track with a radius of 45.0 meters. The magnitude of the centripetal acceleration of the car is A 1750-kilogram car travels at a constant speed of 15.0 m/s around a horizontal, circular track with a radius of 45.0 meters. The magnitude of the centripetal force acting on the car is Universal Gravitational Laws As the distance between two objects increases, the gravitational force of attraction between them will A) decrease B) increase C) remain the same The diagram below Shows four different locations of a satellite in its elliptical orbit about Earth. At which location is the magnitude of the satellite’s velocity greatest? A)A B) B C) C D) D Spacecraft S is traveling from planet P1 toward planet P2 At the position shown, the magnitude of the gravitational force of planet P1 on the spacecraft is equal to the magnitude of the gravitational force of planet P2 on the spacecraft. If distance X is greater than distance Y, then the mass of P1 must be A) less than the mass of P2 B) greater than the mass of P2 C) equal to the mass of P2 The diagram below shows the movement of a planet around the Sun. Area 1 equals area 2. Compared to the time the planet takes to move from C to D, the time it takes to move from A to B is A) less B) greater C) the same A satellite is in geosynchronous orbit. Compared to Earth’s period of rotation, the satellite’s period of revolution is A) less B) greater C) the same The shapes of the paths of the planets about the Sun are all A) circles with the Sun at the center B) circles with the Sun off center C) ellipses with the Sun at the center D) ellipses with the Sun at one focus Base your answer to the following question on the diagram below which represents the orbit of a comet about the Sun. As the comet moves from point A to point B, its potential energy A) decreases B) increases C) remains the same The comet Hyakutake, seen in the Earth's sky in 1996, will take more than 10,000 years to complete its orbit. Which object is at a focus of the comet's orbit? A) Earth B) Sun C) Moon D) Jupiter As the planet moves from point B to point C, how do its kinetic energy and potential energy change? A) Its kinetic energy decreases, and its potential energy decreases. B) Its kinetic energy decreases, and its potential energy increases. C) Its kinetic energy increases, and its potential energy decreases. D) Its kinetic energy increases, and its potential energy increases. What is the magnitude of the gravitational force between two 5.0-kilogram masses separated by a distance of 5.0 meters? A) 5.0 × 10 N –10 B) 3.3 × 10 N C) 6.7 × 10 –11 N D) 1.3 × 10 –11 N 0 An astronaut weighs 8.00 × 102 Newton’ on the surface of Earth. What is the weight of the astronaut 6.37 × 106 meters above the surface of Earth (2 radii total)? A) 0.00 N B) 2.00 × 102 N C) 1.60 × 103 N D) 3.20 × 103 N