Choose the most correct answer
Hysteresis error=0.1% FSO, repeatability error=0.15% FSO, and zero drift=0.2% FSO, then the overall instrument error is
In: Physics
A cell phone manufacturer inspects the video display on each color phone to verify that the screen can display all colors with the brilliance their customers have come to expect. Each phone is turned on, run through a self-test procedure, and classified as either acceptable or unacceptable based on test performance. Based on historical data, the manufacturer produces 0.2 percent defective displays. If they inspect 5000 phones each day for the next 10 days, what are the upper and lower control limits for their control chart if their sample mean mirrors their historical process
In: Statistics and Probability
Most surface waters have silica dissolved in it in the form of silicic acid H4SiO4 (pKa = 9.5) and its ionisation product H3SiO4 - .
(a) Calculate the mole fraction of H3SiO4 - and of H4SiO4 at pHs of 5.0, 6.0, 7.0, 8.0, 9.0, 10.0 and 11.0. The total silica concentration (H3SiO4 - + H4SiO4) is 0.2 mM. Assume that activity = concentration.
(b) Draw a plot with mole fraction on the y-axis and pH on the x-axis. Use the pH range 55.0 to 11.0.
(c) On the plot, at what pH do the two mole fraction lines intersect? What is the significance of this pH?
In: Chemistry
Air flows through a constant area duct. The pressure and temperature of the air at the inlet to the duct are P1 = 100 kPa absolute, and T1 = 298 K, respectively. Inlet Mach number is M1 = 0.1. Heat is transferred to the air as it flows through the duct and as a result the Mach number at the exit increases.
Write a Matlab code and plot the following:
a) Find the pressure and temperature at the exit, while the exit Mach number changes between M=0.2 to 0.99 with
increments of ?M=0.01.
b) Find the amount of heat that is transferred to the air per unit mass of air.
In: Mechanical Engineering
The acceleration of certain objects is studied in an
experimental test track for automobiles. The distance traveled by
an object L is measured as a function of time t to yield the
following:
t (s) 0.1 0.2 0.5 1.0 1.5 1.8 2.0 3.0
L (m) 0.26 0.55 1.56 3.90 7.41 10.28 12.6 30.
Obtain a best fit to this data, considering first-, second, and third-order polynomials. Using these polynomials, calculate the values of the dependent variable L at the time intervals employed for the given data to evaluate the accuracy of the polynomial representations. Discuss the results obtained.
In: Mechanical Engineering
Q] The historical actual sales of an item purchased by a factory is given below. What would have been the forecast had the manager a) used 3 period moving average to make the forecast in the past, and b) used exponential smoothing with alpha=0.2 to make the forecast in the past. Show all calculations. PLEASE PROVIDE TABULATED EXCEL CALCULATIONS.
| Month | Actual Sales |
| 1 | 45 |
| 2 | 48 |
| 3 | 37 |
| 4 | 40 |
| 5 | 43 |
| 6 | 37 |
| 7 | 46 |
| 8 | 48 |
| 9 | 42 |
Sub: Material Science
In: Mechanical Engineering
A child of mass 50 kg is standing at the edge of a playground merry-go-round of diameter 3 m. Other children push the merry-go-round faster and faster until the first child's feet begin to slip. (a) If the coefficient of friction between the shoes and the rotating surface is 0.2, how long does it take the merry-go-round to make one revolution? (b) How fast is the first child traveling when he begins to slip? (c) What is the angle between the first child's body and a vertical line before he begins to slip?
In: Physics
A ten grams ball glides to the left at a speed of 0.4 meters per second on a frictionless flat surface at the OC fair skating rink. The ball collides head-on, elastically, with another larger ball with mass 30 grams which was gliding to the right with a speed of 0.2 meters per second.
A. After the collision, what is the final velocity of each ball.
B. What is the change in momentum for each ball? How do they compare to each other?
C. What is the change in kinetic energy for each ball? How do they compare to each other?
In: Physics
Suppose you have the following information on the Fed’s and the European Central Bank’s (ECB) policy rules: Fed real interest rate =0.5 (inflation rate -2) ECB real interest rate= 0.2 * (inflation rate-2) +1
Graph these policy rules. If the inflation rate is 2 percent in each, what will be the real interest rate in the U.S. and the ECB area?
Some argue that Europe has a much lower tolerance for inflation than the United States. Can you tell—either from the diagram or from the equations—whether this is true?
In: Economics
a.) Develop equations for X and S as a function of dilution rate for a continuous cell culture system. Assuming that the kinetics are governed by an uncompetetive inhibition model.
b.) Plot X, S and "yield of cell mass (g cells/l) per time" versus dilution rate and recommend a dilution rate to operate the reactor at if:
So = 20 g/l
Ks = 1 g/l
I = 0.08 g/l
Y x/s = 0.2 g cells/g substrate
Xo= 0
KI = .02 g/l
m = 0.75 h-1
In: Other