Lubricants are used between the two parts of a machine. Why ?
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Lubricants are used between the two parts of a machine. Why ?
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- 10−4 must be which of the following? 10,000 0.0004 0.0001 100An electric generator at a power plant produces energy by passing superheated steam from a high temperature container (reservoir), through a pipe connected to a series of fans, and then into a low temperature reservoir. As the steam passes across the blades of the fans some of the heat energy of the steam is transformed into mechanical energy, which turns the fans which in turn are connected to a generator, which in turn converts the mechanical energy into electrical energy. If the high temperature steam has a temperature of 376 K and the low temperature reservoir has a temperature of 101.9 K, what is the Carnot efficiency of this process?A typical diving cylinder has 600 L of gas compressed into a 3-L volume. Which of the following statements is true regarding the gas? Its mass doesn’t change during compression. Its density increases during compression. Its volume decreases during compression. all of the above none of the above
- A moonshiner makes the error of filling a glass jar to the brim and capping it tightly. The moonshine expands more than the glass when it warms up, in such a way that the volume increases by 0.5% (that is, ΔV/V0 = 5 10-3) relative to the space available.Taking an example of a hot-air balloon, what happens when you heat some enclosed gas? O It loses some mass and density It increaBoth of the volume and density rise up O Its volume rises up with a lowered density O Its mass gets higher than beforeIf you want to double the kinetic energy of a gas molecule, by what factor must you increase its momentum? 04 O 16 O 2 O 2/2 V2
- At what temperature will the air in the oven have a thermal energy of 5.0 x 10 J?Plasma spraying is a process used to coat the surface of a material with a protective layer to prevent material degradation. In a plasma spray process, the protective coating in powder form is injected into a plasma jet. The powder is then heated until the droplets coalesce and are propelled over the surface of the material. Once deposited on the surface of the material, the molten droplets solidify and form a protective coating layer. Consider a plasma spray process using alumina (k = 30 W/m K, ρ = 3970 kg/m³ and cp = 800 J/kg K) powder that is injected into a plasma jet at T∞ = 15,000 ° C and h = 10,000 W/m²·K. Alumina powder is made up of spherical-shaped particles with a mean diameter of 60 μm and a melting point of 2300 °C.Solving, the amount of time it would take for the particles, with an initial temperature of 20 °C, to reach their melting point from the time they are injected into the plasma jet is 5,25x10 -4 s. The mathematical resolution is in the image. I only need the…The Ritz combination principle can be considered to be a statement of energy conservation. Explain.