Friday

September 30, 2016
Total # Posts: 62

**Lifeorientation**

South Africa

*April 25, 2016*

**Physics**

A batted baseball leaves the bat at an angle of 30 degrees above the horizontal and is caught by an out fielder 400ft from the plate. (a) what was the initial velocity of the ball? (b) How high did it rise? (c) How long was it in the air

*September 4, 2015*

**math**

Ivan is saving money to buy a computer with. He started with $225 in his savings account and the first week he added $75, the second week he added $200, the third week he unfortunately had to take out $50 and the fourth week he added $125. How much more money does he need to ...

*December 10, 2014*

**fluid**

"A liquid with specific gravity 0.8 flows at the rate of 3 l/s through a venturimeter of diameters 6 cm and 4 cm. if the manometer fluid is mercury (sp. gr=13.6) determine the value of manometer reading,h.

*December 23, 2013*

**fluid**

a tap discharge water evenly in a jet at a velocity of 2.6 m/s at the tap outlet, the diameter of the jet at this point being 15 mm. the jet flows down vertically in a smooth stream. determine the velocity and the diameter of the jet at 0.6 m below the tap outlet.

*December 23, 2013*

**Design**

The flow system as shown in the Figure, the centrifugal pump(3500 R.P.M.) is delivering water at 100 gal/min and 70 °F into a boiler operating at a pressure of 35 psig. The water levels in the feed tank and boiler are constant. Because corrosion is expected to be ...

*December 17, 2013*

**Electrical**

If I2=2mA, I4=4mA, and I6=6mA, find I1,I3, and I5 ??

*September 16, 2013*

**Sepration chemistry**

Mixture of A,B,C if the mole fraction of A is 30 and B is 35 Volume percent calculate the mass and mole fraction of each compnant. given that A is methane, B is ethane, C is propane. use SI unit and English unit.

*September 16, 2013*

**Fundamental Of Chemical Engineering**

OK what about if we have all this equations: H2SO4→ so3+H2O SO3→ SO2+1\2O2 SO2→ S+O2

*December 15, 2012*

**Fundamental Of Chemical Engineering**

They didn't give us an equation but I write this, I don't now if it's right or not. SO3 (g) +H2O (l) → H2SO4 (l)

*December 15, 2012*

**Fundamental Of Chemical Engineering**

If a sulfuric acid plant is to produce 10 ton/day of 98% sulfuric acid, How much sulfur is needed, how much air is required and how much water is used?

*December 15, 2012*

**Fundamental Of Chemical Engineering**

If a sulfuric acid plant is to produce 10 ton/day of 98% sulfuric acid, How much sulfur is needed, how much air is required and how much water is used?

*December 15, 2012*

**Biostatistic**

A study is conducted in a patient with HIV.Lower CD4 count is associated with advance disease. A researcher is interested in the association between vitamin supplement and CD4 count.A MULTIPLE REGRESSION ANALYSIS is performed relating CD4count to the use of supplements(coaded ...

*December 11, 2012*

**Biostatistic**

A study is conducted in patient with HIV. Lower CD4 count is associated with advance disease. The researcher is interested in finding out the relation between supplement vitamins and CD4 count. A multiple regression analysis is performed relating CD4 count to the use of ...

*December 11, 2012*

**biostatistic**

Is this statement true or false: when calculating correlation coefficient between two continous variables, the scale on which the variables are measured affect the value of the correlation coefficient.

*December 11, 2012*

**biostatistic**

I am sorry, I do not know how one question is printed so many times. There was some problem in submission of question and when it is submitted, it is printed so many times.

*December 11, 2012*

**biostatistic**

is it true that it is more difficult to reject a null hyputhesis if we use a 10 %level of significance compared with a 5% level of significance?

*December 11, 2012*

**biostatistic**

is it true that sample size required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.05 with 80% power ansd a 5% level of signisicance?

*December 11, 2012*

**biostatatistic**

is it more difficult to reject a null hyputhesis if we use a 10% level of significance compared to 5% level of significance.?

*December 11, 2012*

**Thanks**

Thanks David Q/R for your kind help.It did answer my question. They say for less then five failure and successes we use "exact method" and I was not finding about exact method. Thanks

*December 2, 2012*

**biostatistic**

can we use t-test for two independent sample and dichotomus study with less than five success or failures?

*November 28, 2012*

**biostatistic**

there are 200 subjects enrolled to receive either experimental medications or placebo. At the end of study following data is collected after 6 week. (sd)= standard deviation. BP= blood pressure. experimental meds placebo (n=100) (n=100) Mean BP 120.2(sd 15.4) 131.4(sd18.9) ...

*November 24, 2012*

**Mathematics**

A machine takes 4.2 hours to make 7 parts. At that rate, how many parts can the machine make in 28.8 hours 48 parts 41 parts 172 parts 17 parts

*November 21, 2012*

**Math**

Drinking 8 fluid ounces of milk provides 270.0 milligrams of calcium. How many fluid ounces of milk provide 72.5 milligrams of calcium? Round to the nearest tenth. 2.1 fluid ounces 2.3 fluid ounces 2.6 fluid ounces 1.8 fluid ounces

*November 21, 2012*

**statistic**

Base line BP:120,145, 130,160,152,143,126. After 4 week:122,142,135,158,155,140,130. A clinical trial is planned to compare an experimental medication to lower blood pressure. a pilot study is conducted involving 7 subjects.The objective was to see how BP changes over time ...

*November 21, 2012*

**biostatistic**

Thanks for your help.

*November 21, 2012*

**biostatistic**

recent suggestion is 60 min of exercise per day. A sample of 50 adults in a study of risk factor report exercising a mean of 38 min per day with a standerd deviation of 19 min .based on sampal data, is physical activity significantly less than recommended? Run the appropriate ...

*November 20, 2012*

**Principle**

"the maximum blood pressure in the upper arm of healthy person is about 12mmHg.If a vertical tube open to the atmosphere is connected to the vein in the arm of the person,determine how high the blood will rise in the tube.Take the density of blood to be 1050kg/m3"

*March 6, 2012*

** BUSINESS PROBLEM SOLVING & PROGRAMMING **

Using Flowchart and Pseudo Code and a single real example (trace), please solve the following problems: 1. Payroll Computation Compute the monthly salary for each of the 200 employees in a company assuming the formula for computing is as follows Salary = Basic Salary + ...

*March 3, 2012*

**Math**

An open box is to be made from a 10-ft by 14-ft rectangular piece of sheet metal by cutting out squares of equal size from the four corners and folding up the sides. what size squares should be cut to obtain a box with largest possible volume?

*December 7, 2011*

**Math**

find the Derivative of:: 1\R = 1\R1 + 1\R2

*December 7, 2011*

**chemistry**

A 10.6 liter at 25 C and 3.21 atm inside pressure became 12.8 liters at 221 C after driving in summer. What is the pressure in the hot tire?

*November 20, 2011*

**chemistry**

which of them will be the limiting reactant??

*November 20, 2011*

**chemistry**

what mass of barium sulphate can be produced when 100.0 ml of a 0.100M solution of barium chloride is mixed with 100.0 ml of a 0.100M solution of Iron(lll) sulphate?

*November 20, 2011*

**chemistry**

20g of nitrogen gas and 10g of helium gas are placed together in a 5L container at 25C . Calculate the partial pressure of each gas and the total pressure of the gas mixture.

*November 20, 2011*

**chemistry**

What volume of ammonia at 7.0 atm and 235C would you get from 333g of nitrogen reactin with enough mass of hydrogen?k calculate the density of hydrogen at STP?

*November 18, 2011*

**chemistry**

The mass will be 12.73 g ?!!!!

*November 18, 2011*

**chemistry**

Consider the following reaction 4Al + 3O2 = 2Al2O3 It takes 2.00 L pure oxygen gas at STP (0C ,1atm ) to react completely with a certain aluminum. What is the mass of aluminum reacted?

*November 18, 2011*

**chemistry**

The mole fraction of nitrogen in air is 0.7808. calculate the partial pressure of N2 in air when the atmospheric pressure is 760 torr?

*November 18, 2011*

**chemistry**

The final answer is 10000 ????

*November 18, 2011*

**chemistry**

A solution is prepared by dissolving 0.5842g of oxalic acid (H2C2O4) in enough water to make 100.0ml of solution. A 10.00ml aliquot (portion) of this solution is then diluted to a final volume of 250.0ml. What is the final molarity of thus prepared oxalic acid solution?

*November 18, 2011*

**chemistry**

calculate the mass of solid NaCl that must be added to 1.5L of 0.100M AgNO3 solution to precipitate all the Ag+ ions in the form of AgCl?

*November 18, 2011*

**Math**

FIND THE DERIVATIVE IF Y= (2X-5)^2 / (X^2+4)^3

*October 25, 2011*

**Math**

find the limit lim x^2+x / x^5 + 2x^4 + x^3 as:: a) x=0+ b) x=-1-

*October 21, 2011*

**Math**

WHAT IS THAT x3y3 + y2 = x + 1 ??

*October 19, 2011*

**Math**

find the slope of the curve x^3 y^3 + y^2 = x + y at the point (1,1) and (1,-1)??

*October 19, 2011*

**Math**

find d^85y/dx85 if y = sin x ?? I want the final rule because the solution will be repeated and therefore there will be a particular rule?

*October 19, 2011*

**chemistry**

THANKS

*October 15, 2011*

**chemistry**

Cumene is a compound containing only C and H that is used in the production of Phenol and acetone in industry. combustion of 47.6 mg cumene produce some CO2 and 42.80 mg water. the molar mass of cumene is between 115-125 g/mol. Determine the empirical and molecular formula of ...

*October 15, 2011*

**chemistry**

THANKS ALOT

*October 15, 2011*

**chemistry**

Is The Molecular formula is :: V2(O2)5 ????

*October 15, 2011*

**chemistry**

I can not find the molar mass can you help me more..

*October 15, 2011*

**chemistry**

A certain compound contains only vanadium and oxygen. A 35.00 g sample of the compound contains 19.61 g of vanadium. Determine the empirical formula of this compound.

*October 15, 2011*

**English Gr.11**

If you have read the Handmaid's Tale by Margaret Atwood then in your opinion who do you think has a better life, the handmaid's or the jezebels? Explain why.

*May 15, 2010*

**Life orientation**

Solution

*May 3, 2010*

**Life orientation**

Recomendation how to addrese enviromental problem

*May 3, 2010*

**Life orientation**

cn pls help me

*May 3, 2010*

**ALGEBRA**

DURING THE FIRST PART OF A TRIP, A CANOEIST TRAVELS 35 MILES AT A CERTAIN SPEED. THE CANOEIST TRAVELS 17 MILES ON THE SECOND PART OF THE TRIP AT A SPEED OF 5 MPH SLOWER. THE TOTAL TIME FOR THE TRIP IS 3 HRS. WHAT WAS THE SPEED ON EACH PART OF THE TRIP?

*October 2, 2009*

**math**

the officejet printer can copy lisa's dissertation in 18 min. the laserjet printer can copy the same document in 20 min. if the two machines work together, how long would the take to copy the dissertation

*September 20, 2009*

**algebra**

Wouln't it have to be a shorter timeframe since they are both working together? and one of them does it in 18 mins ..

*September 20, 2009*

**algebra**

the officejet printer can copy lisa's dissertation in 18 min. the laserjet printer can copy the same document in 20 min. if the two machines work together, how long would the take to copy the dissertation

*September 20, 2009*

**math**

y=9-(1/2)x

*September 20, 2009*

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