A metal is heated up to a temperature of 500 degrees Celsius. It is then exposed to a temperature of 38 degrees Celsius. After 150 seconds, the temperature of the metal becomes 205 degrees Celsius When will the temperature be 100 degrees Celsius? Express your answer in seconds and minutes.

I am getting 160°C and 320°F. Please Clarify the answer Whether it's 22°C or 160°C.

(answer number 4-8 & main question) Two vessels of different shape and sizes are connected by means of a pipe with a valve. Vessel A has a diameter of 4 ft and the length is 1.8 m at the given pressure gauge of 1476.4 in Hg and temperature of 82°F. Another vessel spherical in shape contains the same gas at 15,000 torr gauge and 18°C. The valve is opened and when the properties have been determined, it is found out that the gauge pressure is 35.7 kgf/cm2 and the temperature is 21°C. If the barometric pressure is 755 mm Hg, find the following: Volume of Vessel A in in3 - done  Pressure at Vessel A in psia - done Temperature at Vessel A in °R - done Pressure at Vessel B in psia Temperature at Vessel B in °R Pressure of the gas when mixed in psia Temperature of the gas when mixed in °R Atmospheric pressure in psi Main Question: What is the diameter of the spherical tank in inches if the gas is carbon dioxide?

Children asked their parent for an ice cream after dinner. They eat their ice cream as long as it does not melt and its structure is solid. The parent drove to buy an ice cream in the grocery store. The ice cream is sold in family sized package. The store keeps the ice cream packages in the freezer until it is sold. The packages are made from polystyrene material and their size is 0.2´0.1´0.07 m3 . The store freezer temperature is kept at -10o C. The ice cream has a solid structure (not melting) as long as its temperature remains below 0o C. The time it takes to reach back from the store is 20 minutes Will the kids eat the ice cream at home? Ice cream properties: k = 2.2 W/mo C, C = 1800 J/kgo C, r = 900 kg/m3 and h = 10 W/m2oC.

An electric hot water heater consumes 3.1 kilowatts of electricity and converts it to heat. How long will it take the water heater to heat a 67 gallon tank of water from 10 degrees Celsius to 50 degrees Celsius? (1 kilogram of water is 0.37 gallons, 1 Calorie = 4200 J).  It may be helpful to refer back to the weekly handout for guidance on this problem. Your final answer should be in minutes (rounded to the nearest 10 minutes).

What’s the correct answer please?

To demonstrate thermal expansion/contraction we saw a video clip with a sphere and ring (like the ones pictured here). The ring was dipped in liquid nitrogen, and then the sphere would no longer fit through it. What could now be done to the sphere so that it would fit through the ring again? O Dip the sphere in liquid nitrogen. O Use a blowtorch to heat the sphere up. O Nothing can be done to the sphere, only the the ring can be altered. O Put oil on the sphere to make it slippery.

Which of the following terms describes the amount of heat transferred through 1 square foot ofstructure surface when 1 F o temperature difference exists across the surface area.

How many Joules of heat are absorbed by 3 moles of an ideal gas expanding isothermally from an initial pressure of 5 atmospheres to a final pressure of 3 atmospheres at the temperature of zero degrees Celsius. Write your answer in Joules, but do not write the units.