Answer:
the heat transfer from the pipe will decrease when the insulation is taken off for r₂<
where;
r₂ = outer radius
= critical radius
Explanation:
Note that the critical radius of insulation depends on the thermal conductivity of the insulation k and the external convection heat transfer coefficient h .
The rate of heat transfer from the cylinder increases with the addition of insulation for outer radius less than critical radius (r₂< ) 0, and reaches a maximum when r₂ = , and starts to decrease for r₂< . Thus, insulating the pipe may actually increase the rate of heat transfer from the pipe instead of decreasing it when r₂< .
Answer:
Ideally, Internet of Things (IoT) devices have the ability to increase energy efficiency.
Explanation:
The Internet of Things is a series of devices, sensors. and softwares connected to the internet to share data. Ideally, these tools can be used to increase energy efficiency in houses and businesses.
Answer: False
Explanation: Welding process is the joining process of two metals in which they are melted using the heat and then cooling it down and fuse them.Base metal is the melted and then some filler substance is added in the metal and then kept for the fusion process so that joining can be done. Therefore like fusion welding includes the process of melting work piece , so the statement in the question is false.
Explanation:
1. Circumference is pi times diameter.
C = πd
C = 9π inches
C ≈ 28.3 inches
2. Mechanical advantage is ratio of output force to input force.
MA = Fout / Fin
MA = 155 lb / 15 lb
MA ≈ 10.3
3. Mechanical advantage is ratio of input distance over output distance.
MA = din / dout
MA = 10.5 in / 0.85 in
MA ≈ 12.4
4. Mechanical advantage of pulley system is the number of strands.
MA = 8
5. Mechanical advantage is ratio of output force to input force.
MA = Fout / Fin
8 = Fout / 200 lb
Fout = 1600 lb