University:
Eastern Kentucky University
Course:
PHY 201 | University Physics I
Academic year:

2022
Views:

458

Pages:

1
Author:

Maverick Martin

The planet Mercury's surface temperature varies from 700 K during the day to 90 K at night. What is the temperature in ∘C during the day? What is the temperature in ∘F during the day? What is the temperature in ∘C at night? What is the temperature in ∘F at night? An ideal gas at 0∘C consists of 1.0×1023 atoms. 12 J of thermal energy are added to the gas. What is the new temperature in ∘C ? 300 J of heat energy are transferred to 40 g of mercury. By how much does the temperature of mercury increase? The specific heat of mercury is 140 Jkg⋅K . How much heat is needed to raise the temperature of 40 g of water by the same amount? The specific heat of water is 4190 Jkg⋅K . What minimum heat is needed to bring 200 g of water at 30 ∘C to the boiling point and completely boil it away? The specific heat of water is 4190 J/(kg⋅K) and its heat of vaporization is 22.6 × 10 5 J/kg . Brewed coffee is often too hot to drink right away. You can cool it with an ice cube, but this dilutes it. Or you can buy a device that will cool your coffee without dilution - a 160 g aluminum cylinder that you take from your freezer and place in a mug of hot coffee. If the cylinder is cooled to -20 ∘C , a typical freezer temperature, and then dropped into a large cup of coffee (essentially water, with a mass of 500 g ) at 85 ∘C , what is the final temperature of the coffee? The tempearture of a volume of gas is changed from 367 K to 470 K . In that temperature range the gas can move in the x and z direction and rotate around the x and y axis. No gas leaks out so the total number of particles is a constant 7.5×1023 particles. How many degrees of freedom does this gas have? Calculate the change in thermal energy of the gas.