Why must every heat engine have a cold reservoir? The cold reservoir provides a heat sink for the excess heat that is rejected after some of the heat is converted into work. We know from the second law of thermodynamics that 100% conversion of heat to work is impossible hence a colder sink is necessary […]
What is F to the negative 1?
Are connectors listed in wiring diagrams?
Are connectors listed in wiring diagrams? The wiring diagrams are grouped into individual sections. The connectors are identified using the name/number on the diagram pages. What kind of connections does a wiring diagram show? It shows the components of the circuit as simplified shapes, and the power and signal connections between the devices. A wiring […]
How do you determine the depth of a footing?
How do you determine the depth of a footing? General factors to be considered for determining depth of foundation are: Load applied from structure to the foundation. Bearing capacity of soil. Depth of water level below the ground surface. Types of soil and depth of layers in case of layered soil. Depth of adjacent foundation. […]
What is the smoke that comes out of airplanes?
What is the smoke that comes out of airplanes? Jets leave white trails, or contrails, in their wakes for the same reason you can sometimes see your breath. The hot, humid exhaust from jet engines mixes with the atmosphere, which at high altitude is of much lower vapor pressure and temperature than the exhaust gas. […]
How did the invention of the automobile impact society?
How did the invention of the automobile impact society? Inventions change society The automobile changed many things in the United States. These included changes for industry and technology and everyday life. Automobile manufacturing became one the first industries to use the assembly line. The automobile gave people more personal freedom and access to jobs and […]
How do you calculate power produced by a water turbine?
What is shrinkage casting?
What is shrinkage casting? Shrinkage occurs because metals are less dense as a liquid than a solid. A shrinkage cavity is a depression in a casting which occurs during the solidification process. Shrinkage porosity appears with angular edges, compared to the round surfaces of gas porosity. How do you identify drag and cope? The Parting […]
How is the weather or how is the weather like?
How is the weather or how is the weather like? Your teacher is wrong. Both “How is the weather?” and “What is the weather like?” are perfectly correct, grammatical English, and native speakers ask both of those questions all the time. How do you ask about the weather? Some questions you might hear Is it […]
How is Reynolds number calculated?
How is Reynolds number calculated? Reynolds number (Rn) is defined as Rn=(ρVL)/μ=(VL)/ν, where V is the fluid velocity relative to the body and L is a typical length. What is the Reynolds number for laminar flow? 2300 How is Reynolds number calculated for airfoil? Flow around airfoils Fluid dynamicists define the chord Reynolds number R […]