Temperature of cooling chamber of refrigerator is kept at T1 = 280 K. If the surrounding temperature 1.5 times the temperature of cooling chamber, find the COP of refrigerator. Now, if the surrounding temperature is 1.4 times the cooling chamber temperature, what is new COP?

Please give handwritten solution for the one more thermodynamics question. No Chatgpt. Subject: mechanical  Question:

I only need part b

A resistor is wired to a battery in a circuit and dissipates a power P1 as heat. A second battery, with the same voltage, is added in series with the first battery, leading the resistor to dissipate a power P2 as heat. How much does the resistor dissipate with two batteries, relative to with one battery, or in other words, what is the ratio P2/P1?

Got ans 184.7 kPa ,Is it right? Show complete work.

Q3: You have an ideal gas in an insulated container. You compress it from a pressure of 40 × 105 Pa to 20 × 105 Pa, while increasing the volume from 10 to 20 m3. What is the work you done by the gas a- 10 J b- 300 J c- 500 J d- 880 J

Do not make any kind of mistakes in the solution.

b. The ceiling of a certain room in a student's dormitory has an area of 200 ft'. It contains insulation such that its R-value is 30. If the room is maintained at 22°C and the attic has a temperature of 50°C. How many Joules of heat flows through the ceiling into the room in 1 day?

Q4/Find the work done by the steam if 300-L cylinder contain 500 g of steam at 400Kpa now heat transferred to the steam until the temperature is 300 C at constant pressure.

A. Find the specific volume and quality of water at 50kPa and 190 degree Celsius. B. Find the specific volume and quality of water at 50kPa and 30 degree Celsius.