Question: 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

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 X 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.

Step by Step Solution

★★★★★

3.29 Rating (161 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

IDENTIFY and SET UP Use Eq1726 to find the net heat current into the can due to radiation Use QHt to ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

P-T-T (210).docx

120 KBs Word File

Students Have Also Explored These Related Thermodynamics Questions!

The molar heat of vaporization of ethanol is 39.3 kJ/mol and the boiling point of ethanol is 78.3C. Calculate S for the vaporization of 0.50 mol ethanol.

The heat of vaporization of ammonia is 23.4 kJ/mol. How much heat is required to vaporize 1.00 kg of ammonia? How many grams of water at 0C could be frozen to ice at 0C by the evaporation of this...

The heat of vaporization of a liquid ((Hvap) is the energy required to vaporize 1.00 g of the liquid at its boiling point. In one experiment, 60.0 g of liquid nitrogen (boiling point 2196C) are...

16. The rate of radiant energy reaching the earth's upper atmosphere from the sun is about 1.50 kw/m2. The distance from the earth to the sun is 1.50 x 104: m, and the radius of the sun is 6.96 x 10:...

Use the DerivaGem software to value 1 4, 2 3, 3 2, and 4 1 European swap options to receive fixed and pay floating. Assume that the one, two, three, four, and five year interest rates are 6%,...

Starbucks is a rapidly expanding company that provides high-quality coffee products. Assume that as part of its expansion strategy, Starbucks plans to open numerous new stores in Mexico in five...

Define common types of statistics used for quantitative data analysis, describe rationale for choosing among them, and identify computer software for quantitative analysis.

The following six-column table for Hawkeye Ranges includes the unadjusted trial balance as of December 31, 2013. Required 1. Complete the six-column table by entering adjustments that reflect the...

Blues Corp. (based in Miami) is a U.S. drug company that has attempted to capitalize on new opportunities to expand in Eastern Europe. The production costs in most Eastern European countries are very...

River Cruises' management now understands that the trade-off theory of optimal capital structure implies managers will increase debt as long as the value of additional interest tax shields exceeds...

Assume that the auditor proposes that sales be audited by examining the relationship of sales and cost of sales to that of the previous two years, as adjusted for an increase in gross domestic...

Show that the tangent plane to the surface z = x - y at (3,3,0) intersects the surface in two perpendicular lines.

30 Prepared voucher no. 27 for payroll of P50,000 less SSS premium payable of P1,500 and issued check no. 107. Prepare a schedule of vouchers payable

Derive the expression to calculate the friction factor (f=16/Re ) for a fluid flowing through a pipe/tube in laminar flow.

List the factors responsible for determining the forward and backward feed arrangement in evaporator system.

Why log mean temperature difference is not used in single pass heat exchanger.

A plant has water tank mounted on the top of a 27 m platform. The tank is 10 m high. Calculate the height of the water in the tank if a pressure gauge on the second floor at a height of 5 m from the...

explain the potential flow and its important characteristics

As of December 31, 2016, Eliot Corp. has net income per books of $100,000, which includes municipal bond interest of $4,000, a deduction for business meals of $5,000, a deduction for a net capital...

A firm is considering a project with the following cash flows: Time 0 = +$20, 000, Years 1-5 = -$4, 500. Should the project be accepted if the cost of capital is 10%? Yes; The IRR of the project is...

Miller Corporation has a premium bond making semiannual payments. Thw bond has a coupon rate of 12 percent, has a YTM of 10 percent, and has 18 years to maturity. Assume interest rates remain...

Following are four economic states, their likelihoods, and the potential returns: Economic State Probability Return Fast growth 0.29 60 % Slow growth 0.57 17 Recession 0.05 23 Depression 0.09 55...