Which of the following statements are true of an object moving in a circle at a constant speed? Include all that apply. If the net force acting upon the object is suddenly reduced to zero, then the object would suddenly depart from its circular path and travel tangent to the circle. The object experiences a force which has a component directed parallel to the direction of motion. Inertia causes objects to move in a circle. The acceleration of the object is directed tangent to the circle. There can be a force pushing outwards on the object as long as the net force in inwards. The acceleration and the net force vector are directed pérpendicular to each other. OBecause the speed is constant. the acceleration is zero.

Which of the following statements are true of an object moving in a circle at a constant speed? Include all that apply. If the net force acting upon the object is suddenly reduced to zero, then the object would suddenly depart from its circular path and travel tangent to the circle. The object experiences a force which has a component directed parallel to the direction of motion. Inertia causes objects to move in a circle. The acceleration of the object is directed tangent to the circle. There can be a force pushing outwards on the object as long as the net force in inwards. The acceleration and the net force vector are directed pérpendicular to each other. OBecause the speed is constant. the acceleration is zero.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter5: More Applications Of Newton’s Laws

Section5.3: Nonuniform Circular Motion

Problem 5.5QQ: Which of the following is impossible for a car moving in a circular path? Assume that the car is...

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The gravitational force exerted on an astronaut on the Earths surface is 650 N directed downward. When she is in the space station in orbit around the Earth, is the gravitational force on her (a) larger, (b) exactly the same, (c) smaller, (d) nearly but not exactly zero, or (e) exactly zero?
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.)
Which of the following statements are true of an object moving in a circle at a constant speed? Include all that apply. The acceleration and the net force vector are directed perpendicular to each other. The acceleration of the object is directed tangent to the circle. There can be a force pushing outwards on the object as long as the net force in inwards. The object experiences a force which has a component directed parallel to the direction of motion. If the net force acting upon the object is suddenly reduced to zero, then the object would suddenly depart from its circular path and travel tangent to the circle. Because the speed is constant, the acceleration is zero. Inertia causes objects to move in a circle.
Which of the following statements are true of an object moving in a circle at a constant speed? Include all that apply. The object experiences a force which has a component directed parallel to the direction of motion. Inertia causes objects to move in a circle. There can be a force pushing outwards on the object as long as the net force in inwards. Because the speed is constant, the acceleration is zero. The acceleration and the net force vector are directed perpendicular to each other. If the net force acting upon the object is suddenly reduced to zero, then the object would suddenly depart from its circular path and travel tangent to the circle. The acceleration of the object is directed tangent to the circle.
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?
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.
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It is well known that runners run more slowly around a curved track than a straight one. One hypothesis to explain this is that the total force from the track on a runner’s feet— the magnitude of the vector sum of the normal force (that has average value mg to counteract gravity) and the inward-directed friction force that causes the runner’s centripetal acceleration— is greater when running around a curve than on a straight track. Runners compensate for this greater force by increasing the time their feet are in contact with the ground, which slows them down. For a sprinter running at 10 m/s around a curved track of radius 20 m, how much greater (as a percentage) is the average total force on their feet compared to when they are running in a straight line?
A sample of blood is placed in a centrifuge of radius 16.0 cm. The mass of a red blood cell is 3.0 x 1-16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 x 10-11 N. At how many revolutions per second should the centrifuge be operated? rev/s Need Help? Read It
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 1 800-kg car passes over a hump in a roadway that follows the arc of a circle of radius 19.6 m as in the figure below. (a) If the car travels at 29.5 km/h what force does the road exert on the car as the car passes the highest point of the hump? magnitude N direction down (b) What is the maximum speed the car can have without losing contact with the road as it passes this highest point? km/h
Kinesiologists—scientists who study human motion—can measure the forces that act on runners as they round a curve. The forces on a runner’s feet are a vertical normal force that, on average, serves to counteract gravity, and a static friction force parallel to the ground and pointing toward the center of the runner’s circular path. The average value of this inward-pointing force is measured to be 600 N for a 75 kg runner rounding a curve that has a 2.5 m radius. What is this runner’s speed?