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.

Bernie drove home from a vacation in 1.5 hours. he traveled a total distance of 60 miles. what was his average speed in miles per hour? a. 60 mph b. 90 mph c. 40 mph d. 55mph

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?