Mechanical Engineering Answers

The percentage of microorganisms remaining vs. exposure time to autoclave sterilization process follows % = 70-t*2. The percentage of microorganisms

remaining vs. exposure time to dry heat sterilization process follows % = 80-t*5. At what time both the methods are equally efficient?

How to review test certificate of bolt as per standard IS 1367 part 3 ?

Q15.

The ram of a pile driver has mass 800 kg and is released from rest at a

height of 2 m above the top of a 2400 kg pile. If the ram rebounds to a

height of 0.1 m after a direct central impact with the pile, determine the

following:

(a) the velocity of the pile immediately after impact;

(b) the coefficient of restitution;

(c) the percentage of the energy lost in the impact.

An object of 30 kg is moved with a velocity of 2 m/s on a horizontal smooth surface. What is the velocity of the block for 4 seconds if force of 40 N is applied on it in the direction of force?

Explain the fundamental characteristics of a boundary layer, including laminar, transitional, and turbulent regimes.

Calculate Reynolds number, if a fluid having viscosity of 0.4 Ns/m2 and relative density of 900 kg/m3 through a pipe of 20mm with a velocity of 2.5 m.

In automobile,Which device evens out the engine's output for a nice smooth ride?

15 mm dia SS (Young’s modulus = 200 Gpa) rod is coated with HA (Young’s modulus = 300 Gpa).

A) What should be the coating thickness so that the Young’s modulus of the composite is 210 Gpa (use mixture rule)?

B) If the densities are 7.9 and 4.0 gm/cc, what is the average density?

Two guitar strings of the same known length L, and same known linear mass density mu vibrate at their common fundamental frequency of f1 Hz. you would like to know the frequency, f1, of the note you hear, but you don't have perfect pitch. Undeterred, you decide to use physics to find it. Both strings originally have some unknown T. You can increase the tension of one of the strings such that you known its tension is exactly 10% greater than that for the other one. Use your knowledge of interference and beats to find the orignally frequency, f1, in terms of the number of beats per second that you hear, n

A rectangular steel plate is welded as a cantilever to a vertical column and supports a

single concentrated load 95, as shown in Figure 2. The material is ASTM A36 structural steel

and an E70xx welding electrode is used. The plate is 12 mm thickness. Determine the weld

size