For the block that is pulled across a floor byforce, F, the thermal energy of the block andfloor increases because (you can choosemore than one answer)а.the block is giving off heatb. there is friction between themС.there is slidingd. there is internal force acting on theblock causing some release of heatе.the surface is smoothf.none of the above

The rough floor will exert the frictional force on the block because the block is sliding on the…

For the block that is pulled across a floor by force, F, the thermal energy of the block and floor increases because (you can choose more than one answer) O a. the block is giving off heat b. there is friction between them С. there is sliding d. there is internal force acting on the block causing some release of heat e. the surface is smooth f. none of the above

For the block that is pulled across a floor by force, F, the thermal energy of the block and floor increases because (you can choose more than one answer) O a. the block is giving off heat b. there is friction between them С. there is sliding d. there is internal force acting on the block causing some release of heat e. the surface is smooth f. none of the above

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 76P: On a trip, you notice that a 3.50-kg bag of ice lasts an average of one day in your cooler. What is...

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Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 20 rubs, at a distance of 7.50 cm per nub, and with an average frictional force of 40.0 N, what is the temperature increase? The mass of tissues warned is only 0.100 kg, mostly in the palms and fingers.
Following vigorous exercise, the body temperatureof an 80.0 kg person is 40.0 C. At what rate in wattsmust the person transfer thermal energy to reduce the bodytemperature to 37.0 C in 30.0 min, assuming the bodycontinues to produce energy at the rate of 150 W? (1 watt =1 joule/secondor 1 W = J/s)
During the isobaric expansion from A to B represented below, 130 J of heat are removed from the gas. What is the change in its internal energy?
A 300-W heat pump operates between the ground, whose temperature is 0 , and the interior of a house at 22 . What is the maximum amount of the heat per hour that the heat pump can supply to the house?
A 75-kg sprinter accelerates from rest to a speed of 11.0 m/s in 5.0 s. (a) Calculate the mechanical work done by the sprinter during this time. (b) Calculate the average power the sprinter must generate. (c) If the sprinter converts food energy to mechanical energy with an efficiency of 25%, at what average rate is he burning Calories? (d) What happens to the other 75% of the food energy being used?
You have a Dewar flask (a laboratory vacuum flask) that has an open top and straight sides, as shown below. You fill it with water and put it into the freezer. It is effectively a perfect insulator, blocking all heat transfer, except on the top. After a time, ice forms on the surface of the water. The liquid water and the bottom surface of the ice, in contact with the liquid water, are at 0 . The top surface of the ice is at the same temperature as the air in the freezer, 18 . Set the rate of heat flow through the ice equal to the rate of loss of heat of fusion as the water freezes. When the ice layer is 0.700 cm thick, find the rate in m/s at which the ice is thickening.
A 4ton air conditioner removes 5.60107J (48,000 British thermal units) from a cold environment in 1.00 h. (a) What energy input in joules is necessary to do this if the air conditioner has an energy efficiency rating (EER) of 12.0? (b) What is the cost of doing this if the work costs 10.0 cents per 3.60106J (one kilowatt—hour)? (c) Discuss whether this cost seems realistic. Note that the energy efficiency rating (EER) of an air conditioner or refrigerator is defined to be the number of British thermal units of heat transfer from a cold environment per hour divided by the watts of power input.
(a) How long will the energy in a 1470kJ (350kcal) cup of yogurt last in a woman doing work at the rate of 150 W with an efficiency of 20.0% (such as in leisurely climbing stairs)? (b) Does the time found in part (a) imply that it is easy to consume more food energy than you can reasonably expect to work off with exercise?
When heal transfers into a system, is the energy stored as heat? Explain briefly.
A bag containing 0 ice is much more effective in absorbing energy than one containing the same amount of 0 water. (a) How much heat transfer is necessary to raise the temperature of 0.800 kg of water from 0 to 30.0 ? (b) How much heat transfer is required to first melt 0.800 kg of 0 ice and then raise its temperature? (c) Explain how your answer supports the contention that the ice is more effective.
A Carnot engine performs 100 J of work while discharging 200 J of heat each cycle. After temperature of the hot reservoir only is adjusted, it is found that the engine now does 130 J of work while discarding the same quantity of heat. (a) What are the initial and final efficiencies of the engine? (b) What is the fractional change in the temperature of the hot reservoir?
Suppose a woman does 500 J of work and 9500 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of feed? (That is, there is no other energy transfer.) (b) What is her eficiency?