A2‐in schedule‐40 steel pipe carries saturated steam at 60 psi through a laboratory that is 60 ft long. the pipe is insulated with 1.5 in of 85% magnesia that costs $0.75 per foot. how long must the steam line be in service to justify the insulation cost if the heating cost for the steam is $0.68 per 105 btu? the outside‐surface convective heat‐transfer coefficient may be taken as 5 btu/h ft2 f.

A30 kg weight lies on top of a massless piston of area a = 0.01 m2 the exterior air is at a (constant) p =1 atm and t = 27 c. the interior gas is 0.4 moles of (ideal) n2 and it has initial temperature 27.00 degrees c. 1. what is the initial pressure in the interior? a. 29.4 kpa b. 130.7 kpa c. 101.3 kpa the next three questions concern what happens when an amount of heat q is slowly added to the interior, raising the piston by 1 mm and raising the interior temperature to 27.40 c

Awalk up the phase change graph worksheet

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.