A Thermos for Liquid Helium. A physicist uses a cylindrical metal can 0.250 m high and 0.090 m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 × 10 4 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K. with vacuum between the can and the surrounding walls. How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation .
A Thermos for Liquid Helium. A physicist uses a cylindrical metal can 0.250 m high and 0.090 m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 × 10 4 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K. with vacuum between the can and the surrounding walls. How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation .
A Thermos for Liquid Helium. A physicist uses a cylindrical metal can 0.250 m high and 0.090 m in diameter to store liquid helium at 4.22 K; at that temperature the heat of vaporization of helium is 2.09 × 104 J/kg. Completely surrounding the metal can are walls maintained at the temperature of liquid nitrogen, 77.3 K. with vacuum between the can and the surrounding walls. How much helium is lost per hour? The emissivity of the metal can is 0.200. The only heat transfer between the metal can and the surrounding walls is by radiation.
A 6.0-cm-diameter cylinder of nitrogen gas has a 4.0-cm-thick movable copper piston. The
cylinder is oriented vertically, as shown in the figure, and the air above the piston is evacuated.
When the gas temperature is 25 °C, the piston floats 20 cm above the bottom of the cylinder.
(Figure 1)
Figure
20 cm
Vacuum
Piston.
Ź
6 cm
1 of 1
Then 1.5 J of heat energy are transferred to the gas. What is the new equilibrium temperature of the gas in °C?
Express your answer in degrees Celsius.
► View Available Hint(s)
T₂ = 115.06992
Submit
Part D
[Π| ΑΣΦ
X Incorrect; Try Again; 5 attempts remaining
Submit
What is the final height of the piston?
Express your answer with the appropriate units.
► View Available Hint(s)
Previous Answers
LO
L₂= 28.05
Part E
6
HÅ
Previous Answers
cm
μÀ
?
X Incorrect; Try Again; 5 attempts remaining
How much work is done on the gas as the piston rises?
Express your answer with the appropriate units.
► View Available Hint(s)
?
?
°C
A rectangular window in a home has a length of 1.5 m and a height of 0.80 m. If the window allows heat to escape from the home at a rate of 2,000 watts, how thick must the window be if the inside temperature of the home is 220 C and the outside temperature is 3.00C? (Assume that the coefficient of thermal conduction of glass is 0.80 W/mK.)
a.
7.1 mm
b.
124 mm
c.
9.1 mm
d.
8.1 mm
e.
11 mm
In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 10.3 oC. The temperature at the inside surface of the wall is 18.1 oC. The wall is 0.14 m thick and has an area of 6.5 m2. Assume that one kilowatt hour of electrical energy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall?
Chapter 17 Solutions
University Physics with Modern Physics (14th Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.