Problem 5: On a hot day, the freezers in a particular ice cream shop maintain an average temperature of T = -18° C while the temperature of the surroundings is Th=29° C. Randomized Variables T₂ = -18° C Th=29° C Part (a) Calculate the maximum coefficient of performance COP for the freezers. COPC -5.400 ✓ Correct! sin() cos( cotan() asin()) atan() tan() acos() sinh() acotan() cosh() tanh() cotanh() Degrees O Radians At₂ = I ( ET Th Part (b) If the work input to the freezer is W = 2.3 kJ and the freezer actually removes Qc = 13.6 × 10³ J from the ice cream each second, what is the real coefficient of performance? COP-5.910 ✓ Correct! Part (c) An employee puts m = 1.15 kg of melted ice cream at To=4.5° C into the freezer. Assuming that the ice cream freezes at T₁ = -1.0° C, how long in seconds will it take for the ice cream to reach its freezing temperature? Take the specific heat capacity of the melted ice cream as c = 4,000.0 J/(kg-K). Af₁ = 7 8 9 HOME 4 5 6 Tc * 1 2 3 + 0 END NO BACKSPACE DEL CLEAR 2 Qc Part (d) Assuming a latent heat of fusion of L= 280 kJ/kg, how long. At₂, in seconds does it take to freeze the ice cream? W

Problem 5: On a hot day, the freezers in a particular ice cream shop maintain an average temperature of T = -18° C while the temperature of the surroundings is Th=29° C. Randomized Variables T₂ = -18° C Th=29° C Part (a) Calculate the maximum coefficient of performance COP for the freezers. COPC -5.400 ✓ Correct! sin() cos( cotan() asin()) atan() tan() acos() sinh() acotan() cosh() tanh() cotanh() Degrees O Radians At₂ = I ( ET Th Part (b) If the work input to the freezer is W = 2.3 kJ and the freezer actually removes Qc = 13.6 × 10³ J from the ice cream each second, what is the real coefficient of performance? COP-5.910 ✓ Correct! Part (c) An employee puts m = 1.15 kg of melted ice cream at To=4.5° C into the freezer. Assuming that the ice cream freezes at T₁ = -1.0° C, how long in seconds will it take for the ice cream to reach its freezing temperature? Take the specific heat capacity of the melted ice cream as c = 4,000.0 J/(kg-K). Af₁ = 7 8 9 HOME 4 5 6 Tc * 1 2 3 + 0 END NO BACKSPACE DEL CLEAR 2 Qc Part (d) Assuming a latent heat of fusion of L= 280 kJ/kg, how long. At₂, in seconds does it take to freeze the ice cream? W

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter2: The Kinetic Theory Of Gases

Section: Chapter Questions

Problem 81AP: One process for decaffeinating coffee uses carbon dioxide ( M=44.0 g/mol) at a molar density of...

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On a hot day the freezers in a particular ice cream shop maintain an average tempature of Tc=-11 degree C while the tempature of the surroundings is Th= 29 degree C Randomized Varaibles -11, 29 Part (a) Calculate the maximum coefficient of performance COP for the freezers. Part (b) If the work input to the freezer is W = 2.95 kJ and the freezer actually removes Qc = 7.2 × 103 J from the ice cream each second, what is the real coefficient of performance? Part (c) An employee puts m = 1.05 kg of melted ice cream at T0 = 4.5° C into the freezer. Assuming that the ice cream freezes at T1 = -1.0° C, how long in seconds will it take for the ice cream to reach its freezing temperature? Take the specific heat capacity of the melted ice cream as c = 4,000.0 J/(kg⋅K).
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