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For Questions 12 through 17, give a specific example of a process that has the energy changes and transfers described. (For example, if the question states “
∆Eth = 0, W ≠ 0, Q ≠ 0
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College Physics: A Strategic Approach (3rd Edition)
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- please answer the following As a gasoline engine is running, an amount of gasoline containing 12,000 J of chemical potential energy is burned in 1 s. During that second, the engine does 4,000 J of work. What is the engine's efficiency (in percent)? The burning gasoline has a temperature of about 4,300°F (2,600 K). The waste heat from the engine flows into air at about 88°F (304 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?arrow_forwardA heat engine receives 500 j of heat from its combustion process and loses 391 J through the exhaust and friction. What is it’s efficiency?arrow_forwardA bucket holding 17kg of sand is being lifted by a weightless rope. The bucket leaks 0.5kg of sand for every 1m lifted. Find the work done to lift the bucket up by 10m. Let X represent the distance lifted so far, and use dx to represent a small distance of additional lifting. Assume acceleration due to gravity is g=9.8m/s^2. Give the answer in Joulesarrow_forward
- Suppose you spend 30.0 minutes on a stair- climbing machine, climbing at a rate of 90.0 steps per minute, with each step 8.00 inches high. If you weigh 150. lb and the machine reports that 600. kcal have been burned at the end of the workout, what efficiency is the machine using in obtaining this result? If your actual efficiency is 0.18, how many kcal did you actually burn?arrow_forwardA large electrical power station generates 1050 MW of electricity with an efficiency of 37.0%. (a) Calculate the heat transfer (in J) to the power station, Q, in one day. (b) How much heat transfer Q. (in J) occurs to the environment in one day? (c) If the heat transfer in the cooling towers is from 35.0°C water into the local air mass, which increases in temperature from 18.0°C to 20.0°C, what is the total increase in entropy (in J/K) due to this heat transfer? J/K (d) How much energy (in J) becomes unavailable to do work because of this increase in entropy, assuming an 18.0°C lowest temperature? (Part of Q. could be utilized to operate heat engines or for simple space heating, but it rarely is.) to Additional Materials O Reading CS Scanned with CamScannerarrow_forwardIn the past decades, coal was used to heat the engine of a steam locomotive. With the engine, a steam locomotive can be accelerated to a desired speed. Calculate the efficiency of the steam engine, when the calorific value of coal is MJ H = 27.9000 M, velocity of the m, = 115 t weighted locomotive is v = 93 km . Amount of coal used is mc = 11 kg kg What is the amount of heat? MJ Q What is the kinetic energy? Ek MJ What is the efficiency? n = H = Constant Value Unit MJ 27.9000 kg Symbol H mc Mv Quantity calorific value mass of the coal mass of locomotive velocity amount of heat kinetic energy efficiency V Q Ek n Unit MJ kg kg t km h MJ MJ Input instruction H m_c m_v V Q E_k etaarrow_forward
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- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning