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Opening a freezer door. Initially a household freezer compartment is filled with air at room temperature T; = 22.5°C. Then the door is closed and the cooling in the walls is turned on until the air temperature is at the recommended value of T₁ = -19.7°C. The door has height h = 0.640 m and width w = 0.710 m, with hinges on the left edge (and thus with a rotation axis there) and a handle on the right edge. Assume that the freezer is airtight. What are (a) the pressure difference Ap between the inside and outside of the door, (b) the net force F on the door from that pressure difference, and (c) the force Fa needed to open the door by pulling on the handle perpendicular to the door?

Opening a freezer door. Initially a household freezer compartment is filled with air at room temperature T; = 22.5°C. Then the door is closed and the cooling in the walls is turned on until the air temperature is at the recommended value of T₁ = -19.7°C. The door has height h = 0.640 m and width w = 0.710 m, with hinges on the left edge (and thus with a rotation axis there) and a handle on the right edge. Assume that the freezer is airtight. What are (a) the pressure difference Ap between the inside and outside of the door, (b) the net force F on the door from that pressure difference, and (c) the force Fa needed to open the door by pulling on the handle perpendicular to the door?

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Opening a freezer door. Initially a household freezer compartment is filled with air at room temperature T; = 22.5°C. Then the door is closed and the cooling in the walls is turned on until the air temperature is at the recommended value of T₁ = -19.7°C. The door has height h = 0.640 m and width w = 0.710 m, with hinges on the left edge (and thus with a rotation axis there) and a handle on the right edge. Assume that the freezer is airtight. What are (a) the pressure difference Ap between the inside and outside of the door, (b) the net force F on the door from that pressure difference, and (c) the force Fa needed to open the door by pulling on the handle perpendicular to the door? (a) Number i (b) Number MI (c) Number i Units Units Units <>
Transcribed Image Text:Opening a freezer door. Initially a household freezer compartment is filled with air at room temperature T; = 22.5°C. Then the door is closed and the cooling in the walls is turned on until the air temperature is at the recommended value of T₁ = -19.7°C. The door has height h = 0.640 m and width w = 0.710 m, with hinges on the left edge (and thus with a rotation axis there) and a handle on the right edge. Assume that the freezer is airtight. What are (a) the pressure difference Ap between the inside and outside of the door, (b) the net force F on the door from that pressure difference, and (c) the force Fa needed to open the door by pulling on the handle perpendicular to the door? (a) Number i (b) Number MI (c) Number i Units Units Units <>
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