Category: Engineering

What is elastic strain recovery? Elastic recovery, or resilience, is a measure of the ability of an elastomer to return to its original shape when a compression load is removed. Ideally a seal should have a good resilience which can be largely controlled by compounding. What happen when bodies are deformed beyond elastic limit? When […]

How do you pass a string as an argument to a function in C? In C, if you need to amend a string in a called function, pass a pointer to the first char in the string as an argument to the function. If you have allocated storage for the string outside the function, which […]

What is an acceptable decibel level? Decibel Level​ Sounds at or below 70 dBA are generally considered safe. Any sound at or above 85 dBA is more likely to damage your hearing over time. Researchers have found that people who are exposed over long periods of time to noise levels at 85 dBA or higher […]

How do you find mass when given force and acceleration? Plug the numbers you want to convert to mass into the new equation, m = F/a. As an example, we will use an object with a force of 10 N and an acceleration of 2 meters per second squared. Divide the newtons by the rate […]

What is the density expressed in SI units? For example, the density of water is 1 gram per cubic centimetre, and Earth’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in metre-kilogram-second or SI units). For example, the density of air is 1.2 kilograms per cubic […]

How often is there a leap year in the Gregorian calendar? four years Why do we not celebrate leap year every year if a solar year is over 365 days? Our calendar has 365 days in a year, because that’s pretty much how long it takes the Earth to orbit the Sun. The problem is […]

What group of people built the first rocket? The date reporting the first use of true rockets was in 1232. At this time, the Chinese and the Mongols were at war with each other. During the battle of Kai-Keng, the Chinese repelled the Mongol invaders by a barrage of “arrows of flying fire.” These fire-arrows […]

How do you calculate transmission delay? Denote the length of the packet by L bits, and denote the transmission rate of the link from router A to router B by R bits/sec. For example, for a 10 Mbps Ethernet link, the rate is R = 10 Mbps; for a 100 Mbps Ethernet link, the rate […]

What is natural laminar flow? [¦nach·rəl ′lam·ə·nər ′flō] (aerospace engineering) Airflow over a portion of the wing such that local pressure decreases in the direction of flow and flow in the boundary layer is laminar rather than turbulent; frictional drag on the aircraft is greatly reduced. What are 2 characteristics of all fluids? Lesson Summary […]

How do you know if price elasticity of demand is elastic or inelastic? A product is considered to be elastic if the quantity demand of the product changes drastically when its price increases or decreases. Conversely, a product is considered to be inelastic if the quantity demand of the product changes very little when its […]