A driver traveling down a 4% grade collides with a roadside object in rainy conditions,and is issued a ticket for driving too fast for conditions. The posted speed limit is 65mi/h. The accident investigation team determined the following: The vehicle wastraveling 40 mi/h when it struck the object, braking skid marks started 205 ft before thestruck object, the pavement is in good condition, and the braking efficiency of the vehiclewas 93%. Using theoretical stopping distance, assuming aerodynamic resistance isnegligible, and with the coefficient rolling resistance approximated as 0.015, should thedriver appeal the ticket? Why or why not?

2. Calculate the grade resistance: The grade adds an additional force that the vehicle needs to…

Answered: A driver traveling down a 4% grade…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter10: Work, Energy And Machines

Section: Chapter Questions

Problem 68A

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Similar questions

A coal power plant has a rated output of 150 MW and a first law efficiency of 41%. Coal has an energy density of 24 MJ/kg. How many metric tons of coal are wasted by the power plant per hour while running at full capacity (that is, how much of the coal that was burned did not actually contribute to generating electricity)? Express your answer in metric tons of coal.
Ace Industries has a 50 kW air compressor that operates at full-load (LF = 1), all day for 365 days per year. the motor for the air compressor cost €1400, the motor efficiency is 90%, and electricity costs €7.00/kW/month and €0.10/kWh, how much does it cost to operate the air compressor for one year?
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A power specification formula is to be derived for electric motors which drive conveyor belts moving solid material at different rates to different heights and distances. Denoting the efficiency of a motor by ηand neglecting the power needed to drive the belt itself, derive a formula (a) in the SI system of units for the power p in kW, in terms of the mass flow rate m in kg/h, the height b and horizontal distance I in meters and (b) in U.S. customary units, for the power in hp, in terms of the material flow rate w in tons/h, and the height b and horizontal distance I in feet.
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An energy-efficient lightbulb, taking in 26.0 W of power, can produce the same level of brightness as a conventional lightbulb operating at power 100 W. The lifetime of the energy-efficient bulb is 10 000 h and its purchase price is $4.10, whereas the conventional bulb has lifetime 750 h and costs $0.58 per bulb. Determine the total savings obtained by using one energy-efficient bulb over its lifetime as opposed to using conventional bulbs over the same time period. Assume an energy cost of $0.20 per kilowatt-hour. $

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