As a body is projected to a high altitude above the earths surface, the variation of the acceleration of gravity with respect to altitude y must be taken into account. Neglecting air resistance, this acceleration is determined from the formula a=?g0[R2/(R+y)2], where g0 = 9.81 m/s2 is the constant gravitational acceleration at sea level, R = 6356 km is the radius of the earth, and the positive direction is measured upward.

Part A

With what velocity does the particle strike the earth if it is released from rest at an altitude y0 = 800 km?
Express your answer using three significant figures and include the appropriate units

v =

7-7 Consider the same compressor as problems 7-5 and 7-6. Calculate the rate of entropy generation (in kW/K) of the real compressor.

Solutions:

Problem 7-1 & 7-2

7-1 Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum work (in kW) required? Use the right sign convention for work. Hint: The minimum work is that of the reversible process. Start by simplifying the entropy balance!

Ans: W = -75.92

7-2 Consider the same situation as problem 7-1. Your company wants to buy a compressor that will operate adiabatically to compress 2 kg/s of saturated R-134a vapor at -15°C to a pressure of 1000 kPa. What is the minimum outlet temperature (in°C) required? Hint: just like before, the minimum outlet temperature occurs when the process is reversible.

Ans: T2 = 47

7-5 You build the compressor from Participation Problems 7-1 and 7-2 and find that the exit temperature is actually 60°C. If the real compressor is still adiabatic, what is the real work (in kW) ? Use the right sign convention for work.

Ans: -105.38

7-6 Consider the same compressor from Participation Problems 7-5 with a real exit temperature of 60°C. What is the efficiency (expressed as a %) of the compressor?

Ans: 71.4

Only need 7-7

if a horizontal heated plate is divided up into sections, starting from the leading edge, which section would experience the greatest amount of heat transfer ?

Describe the objective and application of each of the following (what is it? How and when can it be applied? What are the anticipated results?): functional analysis and allocation, operator task analysis, error analysis, OSD

define each of the following in relation to systems engineering (CASA)

Operation Labor

Repair Labor

Support Equipment Maintenance

RecurringTraining

Repair Parts and Materials

Repair Consumables

Condemnation Spares

Technical Data Revisions

Transportation Recurring Facilities

Recurring Item Management

Software Maintenance

Contractor Services

Engineering Changes

MiscellaneousO&S

Recurring Warranty

a heat transfer experiment consist of a stream of air blowing over a heated horizontal plate. what causes the formation of both velocity and thermal boundary layers? what causes a difference in thickness between them?

MATLAB

According to Moore’s Law ( an observation made in 1965 by Gordon Moore, a cofounder of Intel Corporation, the number of transistors that would fit per square inch on a semiconductor integrated circuit doubles approximately every 2 years. In 1965, the state of the art technology allowed for 30 transistors per square inch. Moore’s Law says that transistor density can be predicted by d = 30*2(t/2) where t is measured in years.

1. Letting t = 0 represent the year 1965 and t = 46 represent 2011, use this model to calculate the predicted number of transistors per square inch for the 46 years from 1965 to 2011 (use 2 year increments). Display the results in a clearly labeled table.Plot the results using a semilogy plot.

The total transistor count on integrated circuits produced over the 40 year period from 1971 thru 2011 is shown in Table P5.19

.2. Create a semilogy plot of the actual data, using circles only to indicate the data points (no lines).

3. Include a second line representing the predicted values using Moore’s Law, based on the 1971 count as the starting point. Add legends and titles. 4. Plot all 3 of these plots onto a single figure.5.

Has Gordon’s Law proved valid or not?

does anyone have notes for finite element method and/ or structural dynamic?

CULTURAL BACKGROUND: AMERICAN AND JAPANESE BUSINESS CULTURES

Discuss in detail recent developments in the competition and colaboration between american and japanese automobile manufacturers. Do recent improvements in american competitiveness reflect improvements in engineering, production, organizational structure, and human resource policy or are these improvements simply a result of the strenght of Japanese currency, which makes japanese cars too expensive?

Describe the general theory of stress and strain. Explain the properties and characteristics that can be determined using a tensile test. Give general comparison of the different samples. This should be 1-2 pages typed

6. State laws of dry friction.

A pure aluminum bar has a diameter of 15 cm and a length of 1.25 m. The rod is initially uniform in temperature at 300?C. The bar is now suddenly exposed to a convection environment at 50?C with h = 1250 W/m K. How long does it take the center to cool to a temperature of 80?C? (a) Determine if a lumped capacitance analysis is or is not appropriate. (b) Determine the cooling time assuming the lumped capacitance model is valid. (c) Finally, determine the time required for a point 0.5 cm from the surface to drop to 275?C

(Fluid Mechanics; Euler's equation and Bernoulli equation)

As I know, in order to derive Euler's equation from Naveri-Stokes equation, the additional conditions are 1)Incompressible and 2)Inviscid

Then, in order to derive Bernoulli's equation from Euler's equation, what additional conditions are needed?

As I thought, Euler's equation already meets the incompressible and invsicid condtion, so only "steady state" is the additional condition to derive Bernoulli equation from Euler's equation.

Am I right? In addition, are both Navier-stokes equation and Euler's equation need not to be steady state?

In addition, would you derive Bernoulli equation from Euler's equation?

What extra steps must you add for a rendezvous between non-coplanar spacecrafts?

List at least three advantages and disadvantages of a powder-bed laser sintering process.