Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 7, Problem 75P
To determine
The number of reactions per second.
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Chapter 7 Solutions
Physics for Scientists and Engineers
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- Check Your Understanding What are the values of the gravitational potential energy of the hiker at the base, and sea level, with respect to a sea-level zero of potential energy?arrow_forwardCheck Your Understanding The spring Example 7.5 is compressed 6 cm from its equilibrium length. (a) Does the spring force do positive or negative work and (b) what is the magnitude?arrow_forwardAn electron in a television tube is accelerated uniformly from rest to a speed of 8.4107 m/s over a distance of 2.5 cm. What is the power delivered to the electron at the instant that its displacement is 1.0 cm?arrow_forward
- Suppose you are jogging at constant velocity. Are you doing any work on the environment and vice versa?arrow_forwardIn a Coyote/Road Runner cartoon clip (https://openstaxcollege.org/l/21coyroadcarcl), a spring expands quickly and sends the coyote into a rock. If the spring extended 5 m and sent the coyote of mass 20 kg to a speed of 15 m/s, (a) what is the spring constant of this spring? (b) If the coyote were sent vertically into the air with the energy given to him by the spring, how high could he go if there were no non-conservative forces?arrow_forward“ E=K+Uconstant is a special case of the work energy theorem.” Discuss this statement.arrow_forward
- Check Your Understanding Find the work done by the same force in Example 7.4 over a cubic path, y=(0.25m-2)x3 , between the same points A=(0,0) and B=(2m,2m) .arrow_forwardSuppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30 of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (The energy content of gasoline is about 140 Mi/gal.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?arrow_forwardRepeat the preceding problem, but this time, suppose that the work done by air resistance cannot be ignored. Let the work done by the air resistance when the skier goes from A to B along the given hilly path be —2000 J. The work done by air resistance is negative since the air resistance acts in the opposite direction to the displacement. Supposing the mass of the skier is 50 kg, what is the speed of the skier at point B ?arrow_forward
- Explain, in terms of the definition of power, why energy consumption is sometimes listed in kilowatt-hours rather than joules. What is the relationship between these two energy units?arrow_forwardSuppose you throw a ball upward and catch it when it returns at the same height. How much work does the gravitational force do on the ball over its entire trip?arrow_forwardSuppose the mass of a loaded elevator is 1700 kg.What force, in newtons, must be supplied by the elevator's cable to produce an acceleration of 0.82 m/s2 upwards against a 205-N frictional force? How much work, in joules, is done by the cable in lifting the elevator 22 m? What is the final speed, in meters per second, of the elevator if it starts from rest? How much work, in kilojoules, went into thermal energy produced by friction?arrow_forward
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