2. At the Yankee stadium Alex Rodiguez scores a home run against the Miami Dolphins ,by hitting the 0.015kg baseball with a bat causing the ball to increase its velocity from 0m/s to 50m/s. a. Is the work done on the baseball positive or negative ? b. How would you determine the work done by Alex on the baseball ?

2. At the Yankee stadium Alex Rodiguez scores a home run against the Miami Dolphins ,by hitting the 0.015kg baseball with a bat causing the ball to increase its velocity from 0m/s to 50m/s. a. Is the work done on the baseball positive or negative ? b. How would you determine the work done by Alex on the baseball ?

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Description: at a glanceS Add-ons HelpLast edit was 16 minutes agoArialBIUACD 国12LE22. At the Yankee stadium Alex Rodiguez scores a home run against the MiamiDolphins ,by hitting the 0.015kg baseball with a bat causing the ball to increase itsvelocity from 0m/s

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 3PE: (a) Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant...

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(a) Calculate the work done on a 1500-kg elevator car by its cable to lift it 40.0 m at constant speed, assuming friction averages 100 N. (b) What is the work done on the lift by the gravitational force in this process? (c) What is the total work done on the lift?
(a) How fast must a 3000-kg elephant move to have the same kinetic energy as a 65.0-kg sprinter running at 10.0 m/s? (b) Discuss how the larger energies needed for the movement of larger animals would relate to metabolic rates.
Suppose 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?
In 1990 Walter Arfeuille of Belgium lifted a 281.5-kg object through a distance of 17.1 cm using only his teeth. (a) How much work did Arfeuille do on the object? (b) What magnitude force did he exert on the object during the lift, assuming the force was constant?
A student has the idea that the total work done on an object is equal to its final kinetic energy. Is this idea true always, sometimes, or never? Ii it is sometimes true, under what circumstances? If it is always or never true, explain why.
Integrated Concepts (a) What force must be supplied by an elevator cable to produce an acceleration of 0.800 m/s2 against a 200-N frictional force, if the mass of the loaded elevator is 1500 kg? (b) How much work is done by the cable in lifting the elevator 20.0 m? (c) What is the final speed of the elevator if it starts from rest? (d) How much work went into thermal energy?
(a) What is the available energy content, in joules, of a battery that operates a 2.00-W electric clock for 18 months? (b) How long can a battery that can supply 8.00104 J run a pocket calculator that consumes energy at the rate of 1.00103 ?
(a) What is the average power consumption in watts of an appliance that uses 5.00kWh of energy per day? (b) How many joules of energy does this appliance consume in a year?
(a) How high a hill can a car coast up (engines disengaged) if work done by friction is negligible and its initial speed is 110 km/h? (b) if, in actuality, a 750-kg car with an initial speed of 110 km/h is observed to coast up a hill to a height 22.0 m above its starting point, how much thermal energy was generated by friction? (c) What is the average force of friction if the hill has a slope of 2.5 above the horizontal?
A cat’s crinkle ball toy of mass 15 g is thrown straight up with an initial speed of 3 m/s. Assume in this problem that air drag is negligible. (a) What is the kinetic energy of the ball as it leaves the hand? (b) How much work is done by the gravitational force during the ball’s rise to its peak? (c) What is the change in the gravitational potential energy of the ball during the rise to its peak? (d) If the gravitational potential energy is taken to be zero at the point where it leaves your hand, what is the gravitational potential energy when it reaches the maximum height? (e) What if the gravitational potential energy is taken to be zero at the maximum height the ball reaches, what would the gravitational potential energy be when it leaves the hand? (f) What is the maximum height the ball reaches?
Question #30. Please use the attached equation sheet and start with an equation from the sheet and work from there. You can manipulate anyway you want you just have to start from the equation sheet.
A 1.5kg book is sliding along a horizontal surface. At point A, it is moving at 3.21m/s, and atpoint B it has slowed to 1.25m/s. a. How much work was done on the book between A and B?b. Suppose the book continues its motion and -0.750 Joules of work is done on the book frompoint B to C. How fast is it moving at point C?