A large spherical tank is filled with liquid nitrogen at -200ºC. Using an approximation that the elements of the sphere are infinite walls with initial temperature of 10ºC, when the surroundings are at 10ºC as shown, predict the temperature through the wall after 5 minutes using graphical techniques. The tank is 1% carbon steel, 2 cm thick, and the convective heat transfer coefficients are 40 W/m^2 K for air and 60 W/m^2 K for the nitrogen. Also determine the time before the outside wall reaches 5ºC.
You might also like to view...
Which of the following statements is true?
A. Venus rotates almost precisely 5 times relative to Earth between closest approaches. B. Venus's thick atmosphere causes strong tidal braking. C. Venus has a longer day than its year. D. All of these choices are correct.
For a system in mechanical equilibrium, the resultant
A) force must be zero. B) torque must be zero. C) both of these D) none of these
A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons
The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car? For purposes of this problem, neglect the weight of the pistons. A) 727 N B) 926 N C) 2900 N D) 3330 N E) 1.20 kN
According to the special theory of relativity, if a 30-year old astronaut sent on a space mission is accelerated to speeds close to that of light, and then returns to Earth after 20 years as measured on Earth, what would be his biological age upon returning?
a. less than 50 years b. 50 years c. more than 50 years d. exactly 100 years