Choose the best option:

- Viscoelastic stress relaxation

- Viscoelastic creep

Although the viscoelastic response of a polymer can be very complex (time-dependent stress cycling for instance), two special loading scenarios are fairly simple to describe mathematically.

1. _______ refers to scenarios for which the stress applied to a polymer must decay over time in order to maintain a constant strain. Otherwise, over time, the polymer chains will slip and slide past one another in response to a constant applied load and the strain will increase (in magnitude).

2. ________ refers to scenarios for which a polymer will permanently flow over time in response a constant applied stress.

Nanoparticles are often added to polymer matrix to enhance various properties, the interaction with the polymer largely determines the state of the nanoparticle in the polymer matrix. Describe two of these state and one dispersing method that can achieved the most desirable state.

please no hand writing

Write a MATLAB script or function that returns the required initial velocity of the ping pong ball required to launch it a specified distance. Use projectile motion equations. Keep in mind that the initial firing height will change depending on the proposed catapult design.

Primary considerations in the catapult design are accuracy and repeatability as groups will be tasked with hitting the target (cup) repeatedly at distances ranging from 7 to 9 ft. (cup moved in 6 in. increments).

A first-order pressure sensor must meet the following dynamic response specifications: (a) At least 95% accuracy within 0.09s after a step input. (b)The delay corresponding to a ramp input of 60 psi/s is less than 0.02s. (c) Steady-state error of no more than 1 psi for a ramp input of 100 psi/s. (The dynamic error for an input ramp corresponds to the following definition: (d) The dynamic error is to be held smaller than 10% for measuring a turbulent flow with fluctuations of up to 30 Hz. Find a transfer function which has the largest allowable time constant for this sensor.

Why are principles, laws and axioms useful in science and engineering?

A firm has discovered that its sales are highly correlated to a certain economic parameter. The value for that parameter has been predicted to be 15 for the next year (7^th year). Use regression modeling to develop a forecast for the next year.

True or False

1. Shafts utilized for constant power transmission with no supported components may be designed using static failure theory.

2. Slope and deflection of shafts are constrained to ensure proper functionality of the supported components

3. For a given bending moment loading and length, a shaft with smaller diameter will result in smaller angular deflection at the bearing supports.

4. For a shaft subjected to combined variable bending and constant torsional loading, the shaft diameter at the critical location can be determined using Gerber theory

5. A shaft that satisfies deflection constraints for a given loading will have an infinite life

6. Langer failure theory best predicts fatigue failure of shafts under variable bending and torsion

7. Material of the shaft is chosen such that strength is greater than applied loading at critical location in order to ensure desired life and meet reliability requirements.

A kanban system has a rate of delivery, which equals the rate of arrival to the system, of 60 batches in a 10-hr day. Each batch contains 8 parts, and the processing time of a batch is exactly 8 minutes. The time between arrivals is known to have the exponential distribution. Compute the proportion of time the system is busy (?), the lead time, and the WIP (in terms of batches).

What is the effect of increasing feed and speed on (i) machining rate and (ii) tool life

Differentiate turning, milling, and drilling in terms of (i) purpose, (ii) feed stock geometry, and (iii) orientation and direction of motion of tool with respect to part.

A continuous evaporator is operated with a given feed material under conditions in which the
concentration of the product remains constant. The feed rate at the start of a cycle after the
tubes have been cleaned has been found to be 5000 kg/h. After 48 h of continuous operation,
tests have shown that the feed rate decreases to 2500 kg/h. The reduction in capacity is due to
true scale formation. If the downtime per cycle for emptying, cleaning, and recharging is 6 h,
how long should the evaporator be operated between cleanings in order to obtain the maximum
amount of product per 30 days?

Get the avehighs.txt file from BB. The file contains monthly average temperatures from three different locations. The location ID is in the first column and monhtly average temperatures are in the next 12 columns. Write a script that will:

data from file

avehighs

432 33 37 42 45 53 72 82 79 66 55 46 41
777 29 33 41 46 52 66 77 88 68 55 48 39
567 55 62 68 72 75 79 83 89 85 80 77 65

1. load the data

2. call a function that will (a) plot the data on a column of subplots (b) place an x label, months, on the last plot (c) place a ylabel,Monthly Avg Temp (F), on the second plot, (d) for a bonus put a legend on each plot that indicates the location id, and (e) return the yearly average temperatures and the location ID as three two element vectors

3. Display the average yearly temp for each location.

I wish to use a B-type thermocouple to measure a temperature of 1600⁰C. I am using 100⁰C (boiling water) as my reference temperature. What is the emf expected at 1600⁰C ? (Refer to the NIST thermocouple database):

a)

11.233 mv

b.

0.033 mV

c.

11.263 mV

d.

None of the above

A roller bearing has a 22 kN radial load applied. For a life of 18000 hours at 1200 rev/min, specify the smallest suitable roller bearing to use. Assume a rotating outer ring and provide relevant source information for your selected bearing.