For the harmonic oscillator, briefly describe how the eigenvalues relate to the system being under-, critically-, or over-damped? Draw a sketch that relates the time course of solutions to the eigenvalues.
In: Mechanical Engineering
Technician A says that oil pan gaskets are often made of cork due to its ability to conform to small imperfections in the oil pan. Technician B says oil pan and valve cover gaskets are often MLS gaskets to account for the different expansion rates between components. Who is correct? a. Tec A b. Tec B c. Both A and b d. Neither A nor b.
In: Mechanical Engineering
Though the electric-gasoline engine allows better miles per gallon relative to a traditional gasoline engine, it is not without technological tradeoffs. Regarding the first electric-gasoline cars to market, much of the mpg achieved was due to styling not the ability to run on electricity, which from market surveys not as appealing as the styling of a sleeker vehicle body design. New and limited infrastructure for servicing these vehicles was created, which may have deterred buyer acceptance.
Question
What fundamental technical constraints are added when incorporating an electric-gas engine into a vehicle design?
Is the inventive concept itself diluted or enhanced by the embodiment required, especially in regards to vehicle styling?
What new business operations are needed to support the new engine design?
What will drive both acceptance and sales of this new type of vehicle?
Compare the technical constraints of the electric-gasoline engine to the conventional gasoline engine.
In: Mechanical Engineering
In: Mechanical Engineering
can you apply real gas equation to a saturated liquid state or super heated state??
In: Mechanical Engineering
PLS EXPLAIN IN DETAIL THE WELDING PROCESS USED FOR BUTT-JOINTS OF METALS.ALSO ILLUSTRATE THE PROCEDURE TO FOLLOW BEFORE AND DURING WELDING. PLS WRITE IN MORE THAN 100 WORDS.
In: Mechanical Engineering
PLS EXPLAIN IN DETAIL THE SAND MOLD CASTING PROCESS. PLS WRITE IN MORE THAN 250 WORDS ILLUSTRATING EACH AND EVERY FINE DETAIL.
In: Mechanical Engineering
In a three-point balancing test without phase the values for the
original vibrations are V0=10 mm, and the values of the amplitude
of vibration for the three points in the test with a trial mass,
mt, of 50 g are:
V1=14 mm at 0 degrees
V2=20 mm at 120 degrees
V3=7 mm at 240 degrees
Apply the mathematical method,
In: Mechanical Engineering
A heat engine operates by extracting 2,000 KJ of heat from a source at 1500 K, and dumping 800 of waste heat into a sink at 300 K. a) Does this engine violate any known laws of thermodynamics? b) How much work does this engine produce? c) What are the first and second law efficiencies?
In: Mechanical Engineering
In: Mechanical Engineering
Determine the response of a mass-spring system when it is subjected to a half-sine pulse of 250 dyne amplitude and 0.25? seconds duration. The mass is 20gm and the spring stiffness is 197.4 dynes/cm.
In: Mechanical Engineering
A torsion pendulum with a vanadium wire containing nitrogen, and a period of 2.00 seconds, shows a decrease in the pendulum amplitude, A, of 10 percent in 100 cycles of oscillation at 350K. Compute:
a.The specific damping capacity.
b.The logarithmic decrement.
c. Tan α, where α is the phase angle by which the strain lags the stress.
In: Mechanical Engineering
One kg mole of an ideal gas is compressed isothermally at 127°C from 1 atm to 10 atm in a piston-and-cylinder arrangement. Calculate the entropy change of the gas, the entropy change of the surroundings, and the total energy change resulting from the process, if: (a) the process is mechanically reversible and the surroundings consist of a heat reservoir at 127°C. (b) the process is mechanically reversible and the surroundings consist of a heat reservoir at 27°C. (c) the process is mechanically irreversible, requiring 20% more work than the mechanically reversible compression, and the surroundings consist of a heat reservoir at 27°C.
In: Mechanical Engineering
In sand casting, the volumetric size of the pattern is:
(A) bigger than, (B) same size as, or (C) smaller than the cast part.
In: Mechanical Engineering
Which of the following are advantages of die casting over sand casting (four best answers):
(A) better surface finish,
(B) closer tolerances,
(C) higher melting temperature metals,
(D) higher production rates,
(E) larger parts can be cast, and (F) mold can be reused?
In: Mechanical Engineering