32. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanicalwork per cycle. The heat is obtained by burning gasoline with heat ofcombustion L. = 5.0 x 104 J-g. What is the thermal efficiency of this engine?A. 15%B. 20%*C. 30%D. 14%33. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanicalwork per cycle. The heat is obtained by burning gasoline with heat ofcombustion Le = 5.0 x 104 J-g. How much heat is discarded in each cycle?A. -2000 Joules*B. -1000 JoulesC. -3000 JoulesD. -4000 Joules34. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanicalwork per cycle. The heat is obtained by burning gasoline with heat ofcombustion L. = 5.0 x 104 J-g-1. How much gasoline is burned in each cycle?A. 0.04 grB. 0.02 grC. 0.01 grD. 0.05 gr*35. What is the total random Kinetic energy of the molecules in 1 mol of a gas atemperature of 3OOK?A. 3741 Joules*B. 2654 JoulesO. 1056 oulesD. 7123 Uoules36. A Carnot engine takes 2000J of heat from a reservoir at 5o0 Kand discards some heat to a reservoir at 05OK.HOMmuch works does the enginedo, how much heat is discarded, and what 1s the efficiency?A. -3600 Joule, 100 Joule,B. -1400 Joule, 6po Joule, 30$*does some workC. -2500 Goule, So CTbule, 904D.-1000 Joule, 30OWToule, 1055037. I the cycle deScribed in prob. 33 run backward as a refrigerator. What is theperfcrmance coefficient?A. 9.06B..93-C. 3.15D. 1.5L88.One kilogram of ice a: °c 15 meited and converted to vater at 0 c. Compute4ce change in ertropy?AL200 Joule/-4/10 26. A Styrofoam box used to keep drinks cold at a picní has a total wall area(including the lid) of 0 80 m and a vall thickness of 2.0 cm. It is filledwith ice and cons of orange such at 0 c. What is the rate of heat flow that thebox if the outside temperature 1s 30d? How much ice melts in one day?A. H = 10 J/sec, m = 32 kgB. H = 12 J/sec, m = 3,1 kg*C. H 21 /sec, m = 3.1 kgD. H = 12 J/sec, m = 2.3 kg27. Compute the pressure (due to surface tension) within soap bubble of diameter0.8 inch. Surface tension is 0.0024 lb/ft.A. 3.28 lb/ft?B. 0.91 lb/ft?C. 3.12 lb/ft?D. 0.29 lb/ft?*28. The air inside a warm room is at 25 C, and the outside air is at -15.C. Howmuch heat is transferred though 1.00m? of a glass windowpane with a thermalconductivity of 0.80J-m-s-1- (c)1 and aC= ) 5/42A. 15 wattsB. 10 wattsthickness of 2.00 mm if h = 2.0 W-m²- (CERC. 24 wattsD. 85 wätts*29. A thin square steel plate, 10 cm on side, is heated in a blacksmith's forge toa temperature of 800°C. If the emissivity is unity what is the total rate ofradiation of energy?A. 2.3 KWB. 8.1 KC. 2.1 KwD. 1.5 K*30. The density of mercury at O cis 13.6 g/cmi, and the coefficient of cubicalexpansion is 0.000182 per C. Calculate the density of mercuryA. 39.12 g/cm?B. 18.2 g/cm?at 50°C.C. 13.48 g/cm*D. 31.84 g/cm31 A motor having an efficiency of 90% operates a crane having an efficiency of40. With what steady velocity does the crane lift an 880 lb bale if the powersuppiied to the motor is 5 KW?A. 1.5 f:/sec*c. 5.1 ft/sec11 1 3/10

Please note : As per answering quidelines I can answer the first question(Q.32) only. Since this is…

32. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanical work per cycle. The heat is obtained by burning gasoline with heat of combustion L. = 5.0 x 10 J-g. What is the thermal efficiency of this engine? A. 15% B. 20%* C. 30% D. 14% 33

32. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanical work per cycle. The heat is obtained by burning gasoline with heat of combustion L. = 5.0 x 10 J-g. What is the thermal efficiency of this engine? A. 15% B. 20%* C. 30% D. 14% 33

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.

Question

32. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanical
work per cycle. The heat is obtained by burning gasoline with heat of
combustion L. = 5.0 x 104 J-g. What is the thermal efficiency of this engine?
A. 15%
B. 20%*
C. 30%
D. 14%
33. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanical
work per cycle. The heat is obtained by burning gasoline with heat of
combustion Le = 5.0 x 104 J-g. How much heat is discarded in each cycle?
A. -2000 Joules*
B. -1000 Joules
C. -3000 Joules
D. -4000 Joules
34. A gasoline engine takes in 2500 J of the heat and delivers 500J of mechanical
work per cycle. The heat is obtained by burning gasoline with heat of
combustion L. = 5.0 x 104 J-g-1. How much gasoline is burned in each cycle?
A. 0.04 gr
B. 0.02 gr
C. 0.01 gr
D. 0.05 gr*
35. What is the total random Kinetic energy of the molecules in 1 mol of a gas a
temperature of 3OOK?
A. 3741 Joules*
B. 2654 Joules
O. 1056 oules
D. 7123 Uoules
36. A Carnot engine takes 2000J of heat from a reservoir at 5o0 K
and discards some heat to a reservoir at 05OK.HOMmuch works does the engine
do, how much heat is discarded, and what 1s the efficiency?
A. -3600 Joule, 100 Joule,
B. -1400 Joule, 6po Joule, 30$*
does some work
C. -2500 Goule, So CTbule, 904
D.-1000 Joule, 30OWToule, 105
50
37. I the cycle deScribed in prob. 33 run backward as a refrigerator. What is the
perfcrmance coefficient?
A. 9.06
B..93-
C. 3.15
D. 1.5
L88.One kilogram of ice a: °c 15 meited and converted to vater at 0 c. Compute
4ce change in ertropy?
AL200 Joule/-
4/10

26. A Styrofoam box used to keep drinks cold at a picní has a total wall area
(including the lid) of 0 80 m and a vall thickness of 2.0 cm. It is filled
with ice and cons of orange such at 0 c. What is the rate of heat flow that the
box if the outside temperature 1s 30d? How much ice melts in one day?
A. H = 10 J/sec, m = 32 kg
B. H = 12 J/sec, m = 3,1 kg*
C. H 21 /sec, m = 3.1 kg
D. H = 12 J/sec, m = 2.3 kg
27. Compute the pressure (due to surface tension) within soap bubble of diameter
0.8 inch. Surface tension is 0.0024 lb/ft.
A. 3.28 lb/ft?
B. 0.91 lb/ft?
C. 3.12 lb/ft?
D. 0.29 lb/ft?*
28. The air inside a warm room is at 25 C, and the outside air is at -15.C. How
much heat is transferred though 1.00m? of a glass windowpane with a thermal
conductivity of 0.80J-m-s-1- (c)1 and a
C= ) 5/42
A. 15 watts
B. 10 watts
thickness of 2.00 mm if h = 2.0 W-m²- (
CER
C. 24 watts
D. 85 wätts*
29. A thin square steel plate, 10 cm on side, is heated in a blacksmith's forge to
a temperature of 800°C. If the emissivity is unity what is the total rate of
radiation of energy?
A. 2.3 KW
B. 8.1 K
C. 2.1 Kw
D. 1.5 K*
30. The density of mercury at O cis 13.6 g/cmi, and the coefficient of cubical
expansion is 0.000182 per C. Calculate the density of mercury
A. 39.12 g/cm?
B. 18.2 g/cm?
at 50°C.
C. 13.48 g/cm*
D. 31.84 g/cm
31 A motor having an efficiency of 90% operates a crane having an efficiency of
40. With what steady velocity does the crane lift an 880 lb bale if the power
suppiied to the motor is 5 KW?
A. 1.5 f:/sec*
c. 5.1 ft/sec
11 1 3/10

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