5.
Describe qualitatively
the
microstructural development that will occur upon slow cooling from
of 1050 steel from 1600 °C to 20 °C.
6.
a). What are p-type
semiconductors? What are their differences comparing with n-type
semiconductors?
b).
Moore’s law predicts the rapid and steady growth in the number of
transistors contained on a single microcircuit chip. Why do
engineers want to increase the number of transistors contained on a
single microcircuit chip?
c). Even
through silicon is abundant on the...
If
1080 steel was heated to 1000 degree and then aircooled in the room
temperature, 1080 steel has lower strength, what additional heat
treatment do you recommend to gain strength? Explain in terms of
microstructure theory why this is the case. How else could we
change our material to increase strength? Explain in terms of
microstructural theory why this is the case
1. A dramatic classroom demonstration involves cooling a balloon
from room temperature (293 K ) to liquid nitrogen temperature (77
K).
If the initial volume of the balloon is 2.5 L , what will its
volume be after it cools? (Assume constant pressure.)
Express your answer using two significant figures.
** different kind of question for #2.**
2. A sample of gas in a cylinder as in the example in Part A has
an initial volume of 48.0 L ,...
3) For the case of 4% Al in Cu, why does the room
temperature strength not decrease, while the hot aged samples show
the increase then decrease in strength with time. Be sure to
measure crystal structure and phase boundaries ?
Please type your answer!!! Thanks
Betty's works in a steel mill making steel cables. Suppose cable
strength can be altered in two different ways: thickness and the
amount of molybdenum (an element used to make steel) it has. She
wants to figure out the strongest cable she can make so she test
several different cable formulas each many times. Below is a
portion of the data she uses to run a regression with Thickness and
Molydenum predicting Strength:
Strength (Kilonewton, kN)
Thickness (mm)
Molybdenum (%)...
An experiment is conducted to observe the room temperature.
Assume the temperature can vary from 0 oF to 100 oF. A collection
of 6 measurements of temperature in a classroom during May is given
below.
Meas.# 1 2 3 4 5 6
Temperature 34 79 91 38 46 20 oF
(a) Define the sample space for the measurements.
(b) Find at least two statistical measures for location.
Indicate which one is preferred.
(c) Find the variance and standard deviation.
(d)...
The room is 5*6
Steel yield stress (fy = 60000 psi)
Concrete ultimate compressive strength (f’c = 4000 psi)
Reinforced concrete density = 150 lb/ft3.
Normal weight concrete is used.
The slab is treated as a one way slab and subjected to a dead
load of 120 psf (excluding the self-weight
of the slab) and a live load of 220 psf.
- The slab is supported by beams on the edges.
- There is a column at each corner of...
100. mL of H2O is initially at room temperature (22.0∘C). A
chilled steel rod at 2.0∘C is placed in the water. If the final
temperature of the system is 21.1 ∘C, what is the mass of the steel
bar? Specific heat of water = 4.18 J/g⋅∘C Specific heat of steel =
0.452 J/g⋅∘C Express your answer numerically, in grams, to one
significant figure.