How many types of N95 masks are there? The N95 respirator is the most common of the seven types of particulate filtering facepiece respirators. This product filters at least 95% of airborne particles but is not resistant to oil. This web page provides a table of NIOSH-approved N95 respirators, listed alphabetically by manufacturer. What are […]
What is the SI unit of viscosity and surface tension?
What is the SI unit of viscosity and surface tension? kgs−2,kgm−1s−1. Is surface tension a force? Surface Tension: “The property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules.” The cohesive forces between liquid molecules are responsible for the phenomenon known as […]
How can entropy be reduced?
How can entropy be reduced? When a small amount of heat ΔQ is added to a substance at temperature T, without changing its temperature appreciably, the entropy of the substance changes by ΔS = ΔQ/T. When heat is removed, the entropy decreases, when heat is added the entropy increases. Entropy has units of Joules per […]
What is the output frequency for a frequency division circuit that contains 12 flip flops with an input clock frequency of 20.48 MHz?
What is the output frequency for a frequency division circuit that contains 12 flip flops with an input clock frequency of 20.48 MHz? 12. Determine the output frequency for a frequency division circuit that contains 12 flip-flops with an input clock frequency of 20.48 MHz. Output Clock frequency = = 5000 i.e., 5 kHz. How […]
How is metabolism important in nutrition processes?
How is metabolism important in nutrition processes? Nutrition is the key to metabolism. The pathways of metabolism rely upon nutrients that they breakdown in order to produce energy. This energy in turn is required by the body to synthesize molecules like new proteins and nucleic acids (DNA, RNA). How is metabolism regulated in the body? […]
How many rotations and color changes are needed to perform per insertion deletion in a red black tree?
How many rotations and color changes are needed to perform per insertion deletion in a red black tree? Solution: True, at most two rotations are performed. (b) Is it true that in the worst case a red-black tree deletion requires O(1) node recolorings? When a node is first inserted in a red black tree it […]
What does the amount of energy to change temperature of an object depend on?
What does the amount of energy to change temperature of an object depend on? The change in temperature of a system depends on: the amount of thermal energy transferred to the system. the mass of the substance. the nature of the substance itself. What is the relationship of the amount of heat transferred between bodies […]
What are the different mechanisms for diffusion?
What are the different mechanisms for diffusion? Diffusion can occur by two different mechanisms: interstitial diffusion and substitutional diffusion. Picture an impurity atom in an otherwise perfect structure. Which diffusion mechanism is faster interstitial or vacancy? Interstitial diffusion is generally faster than vacancy diffusion because bonding of interstitials to the surrounding atoms is normally weaker […]
What type of current is used in arc welding?
What type of current is used in arc welding? Both direct current (D.C.) and alternating current (A.C.) are used for arc welding. The alternating current for arc is obtained from a step down transformer. The transformer receives current from the main supply at 220 to 440 volts and step down to required voltage i.e., 80 […]
How do you find the maximum theoretical efficiency?
How do you find the maximum theoretical efficiency? The maximum theoretical efficiency of a heat engine (which no engine ever attains) is equal to the temperature difference between the hot and cold ends divided by the temperature at the hot end, each expressed in absolute temperature (Kelvin). What is the theoretical maximum efficiency? The Carnot […]