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Mechanical Engineering Questions and Answers February 19, 2020

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A Hydrogen atom has one proton in the nucleus and one electron in the shell. In a classic model of the atom, in a certain state, this electron is in a circular orbit around the nucleus with an velocity of 1090729.85781991 m/s. What is the radius of the orbit?

In an oscillating LC circuit, L = 4.26 mH and C = 2.18 F. At t = 0 the charge on the capacitor is zero and the current is 1.60 A. (a) What is the maximum charge that will appear on the capacitor? (b) At what earliest time t > 0 is the rate at which energy is stored in the capacitor greatest, and (c) what is that greatest rate?

An unknown wire in a circuit has a circular cross-section with a diameter of 3.5 mm. It carries a current of 8.9 mA. rent dens in milliamperes per square centimeter, in this wire? 33% Part (a) What is the J= 92.505 J= 92.51 Correct! 33% Part (b) If you assume the drift velocity in this wire is 1 x 10-2 cm/s, what is the density of charge carried

There is exactly one value of a and one value of b such that the vector field F (3ay+z,4ayz +4x, -by? +x) is conservative. For those values of a and b, the value of In a sin b is (A) -0.169591 (B) 0.486648 (C)1.50456 (D) 1.55423 (E) -0.74429 (F) -0.918398 (G) -0.849601 (H) -0.746005

What acylium ion is formed from each acid chloride? a O OH b. o More Practice:

From a test of an air compressor driven directly by a steam engine, the following data and results were obtained capacity, 800 cfm; suction at 14.7 psia; discharge at 110 psia. indicated work of the compressor, 155 hp; indicated work of steam engine, 172 hp. Calculate (a) the compression efficiency and (b) the overall efficiency.

An air compressor with a clearance of 4% compresses 14.73 m 3 /min of air from 97 kPa, 27C to 462 kPa. If the overall adiabatic efficiency is 61%, determine the indicated horsepower of the directly connected driving steam engine.

Let e 0 and let A be the region bounded by the curves y a, y e, and y 0. Find the value of c that makes A 9.

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