Saturday

April 30, 2016
Total # Posts: 1,202

**chemistry**

sodium borohydride (NaBH4) is used industrially in many organic syntheses. one way to prepare it is by reacting sodium hydride with gaseous diborone. Assuming an 86.8% yield,how many grams of NaBH4 can be prepared by reacting 7.98g of sodium hydride and 8.16g of diborone? i ...
*October 4, 2011*

**Physics**

One boat tows another boat by means of a tow line, which is under a constant tension of 495 N. The boats move at a constant speed of 4.75 m/s. How much work is done by the tension in 1.10 min? Not sure how to apply the work-energy theorem. I assume velocity needs to be ...
*October 3, 2011*

**Importrant**

No problemo
*October 3, 2011*

**Importrant**

Thanks Ms.Sue for all your help your the best helper ever.
*October 3, 2011*

**Importrant**

ii.) I’ve missed more than 9000 shots in my career. I’ve lost almost 300 games. 26 times, I’ve been trusted to take the game winning shot and missed. I’ve failed over and over and over again in my life. And that is why I succeed.” – M____________ ...
*October 3, 2011*

**Quotes**

Thanks Ms.sue But now i just need to awnser ii) and ii) and thanks for the feedback i used it.
*October 3, 2011*

**Quotes**

i.) When elephants fight, it’s the grass that suffers ii.) I’ve missed more than 9000 shots in my career. I’ve lost almost 300 games. 26 times, I’ve been trusted to take the game winning shot and missed. I’ve failed over and over and over again in my ...
*October 3, 2011*

**Physics**

Tarzan, who weighs 917 N, swings from a vine through the jungle. How much work is done by the tension in the vine as he drops through a vertical distance of 3.85 m? Simply calculating; W=(917N)*(3.85m)= 3530.45 J Isn't working, I'm not sure how to apply the work ...
*October 3, 2011*

**social studies**

same its D
*October 3, 2011*

**math**

thanks jackie
*September 29, 2011*

**math**

need help please help me
*September 29, 2011*

**math**

A bumblebee can flap its wings 200 times per second. About how many time times can it flap in l000 min.
*September 29, 2011*

**Physics**

I need help figuring this out. I am asked to write about similarities of two different ways of determining the value of g. One of them is using the slope of the line, and one of them is using the average. Each method used the same L and T values.
*September 29, 2011*

**physics**

A rocket is fired straight up and accelerates upward at 24 m/s2 for 12 seconds. The rocket then runs out of fuel and coasts. Ignore any air resistance effects and use -9.8 m/s2 for the local acceleration due to gravity. a) What is the rocket’s maximum altitude? b) How ...
*September 28, 2011*

**Physics 8B**

A 280 electric motor is 90% efficient, meaning that 90% of the energy supplied to it ends up as mechanical work. If the motor lifts a 210 weight at 3.5 , how much current does it draw? Express your answer using two significant figures. I= ? Amps
*September 18, 2011*

**physics 8b**

A piece of wire with mass per unit length 88 g/m runs horizontally at right angles to a horizontal magnetic field. A 6.5A current in the wire results in its being suspended against gravity. What is the magnetic field strength? Express your answer using two significant figures...
*September 16, 2011*

**Sociology**

Q. Jane is thirteen and a middle school student. At her age the most important agent of socialization in her life is likely to be the: a)community b)peer group c)media d)school i think its b. please help me
*September 16, 2011*

**Networking**

help
*September 13, 2011*

**Physics**

A subway train is designed with a maximum acceleration of ±0.637 m/s2 , which allows for both passenger safety and comfort. (a) If subway stations are 8.6 km apart, what is the maximum velocity that can be obtained between stations? (b) How long does it take to travel ...
*September 12, 2011*

**Physics**

A Styrofoam ball of radius 60 cm falls with a terminal velocity of 8.65 m/s. What is the mass of the ball?
*September 12, 2011*

**College Physics**

A batted baseball is hit with a velocity of 47.3 m/s, starting from an initial height of 8 m. Find how high the ball travels in two cases: (a) a ball hit directly upward and (b) a ball hit at an angle of 70° with respect to the horizontal Also find how long the ball stays ...
*September 12, 2011*

**College Physics**

A batted baseball is hit with a velocity of 47.3 m/s, starting from an initial height of 8 m. Find how high the ball travels in two cases: (a) a ball hit directly upward and (b) a ball hit at an angle of 70° with respect to the horizontal. Also find how long the ball stays...
*September 12, 2011*

**College Physics**

Consider a rock thrown off a bridge of height 78.5 m at an angle è = 25° with respect to the horizontal as shown in Figure P4.20. The initial speed of the rock is 15.6 m/s. Find the following quantities: (a) the maximum height reached by the rock (b) the time it ...
*September 12, 2011*

**Physical Science**

A 1000-kg car is moving east at 80 km/h collides head on with a 1500-kg car moving west at 40 km/h, and the two cars stick together. Which way does the wreckage move and with what initial speed?
*September 11, 2011*

**algebra**

Y=32 x=8
*September 11, 2011*

**Physical Science**

A 40-kg skater moving at 4 m/s overtakes a 60-kg skater moving at 2 m/s in the same direction and collides with her. The two skaters stick together. What is their final speed?
*September 11, 2011*

**Physical Science**

A boy throws a 4-kg pumpkin at 8 m/s to a 40-kg girl on roller skates, who catches it. At what speed does the girl then move backward?
*September 11, 2011*

**Physical Science**

A force of 10 N is used to lift a 600-g ball from the ground to a height of 1.8 m, when it is let go. What is the speed of the ball when it is let go??
*September 11, 2011*

**Physical Science**

What do I put my answers in? So the anwser will be 14*8??
*September 11, 2011*

**Physical Science**

An escalator 14 m long is carrying a 70-kg person from one floor to another 8 m higher. The escalator has a speed of 1.0m/s. How much work does the escalator do in carrying the person to the top?
*September 11, 2011*

**functions**

what is the domain of f(x)={2x^2 -2,if x < or= 1 {x+1,if x>1?
*September 9, 2011*

**geometry**

m<AOC=7x-2, m<DOC=2x+8, m<EOD=27 find the value of X
*August 30, 2011*

**geometry**

mÚAOC = 7x - 2, mÚDOC = 2x + 8, mÚEOD = 27 help me find the value of x
*August 30, 2011*

**math**

Consider the following list of premises: a ^ :b ! c; :a ! :d; Show that g is a valid conclusion by constructing a step-by-step argument
*August 22, 2011*

**physics**

An aluminum rod at 18 degrees Celsius has a length of 2.50 meters. At what possible temperatures will it's length change by 1cm?.
*August 2, 2011*

**algebra 2**

Find the inverse of the function. f(x) = e^-x + 5 f(x) = 10^x + 2
*July 13, 2011*

**Chemistry**

Or would it be just 35.5 grams in Cl?
*July 12, 2011*

**Chemistry**

I meant 443.75 g, would that be correct
*July 12, 2011*

**Chemistry**

Would it be 43.75g
*July 12, 2011*

**Chemistry**

how many grams are in 12.5 moles of chlorine (gas)?
*July 12, 2011*

**algebra II**

use alaytical and graphical methods to solve the inequality. (3x+6/7x^2+5) > 0
*July 10, 2011*

**algebra II**

x^3+10x^2+31x <= -30 (2x/x+1) <= (4/x-3) if the signs mess up there both less than or equal too.
*July 10, 2011*

**algebra 2**

use analytical and graphical methods to solve the inequality. x^3+10x^2+31<=-30 (2x/x+1)<=(4/x-3)
*July 9, 2011*

**algebra 2**

use analytical and graphical methods to solve the inequality. x^3+10x^2+31¡Ü-30 (2x/x+1)¡Ü(4/x-3)
*July 9, 2011*

**algebra 2**

Use analytical and graphical methods to solve the inequality. (3x+6)/(7x©÷+5)>0 m©ø-4m¡Ã0
*July 9, 2011*

**algebra 2**

use analytical and graphical methods to solve the inequality. x©ø+10x©÷+31 ¡Â -30 (2x/x+1)¡Â(4/x-3)
*July 9, 2011*

**algebra II**

The profit made when t units are sold, t>0, is given P=t²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).
*July 8, 2011*

**Algebra II**

Im sorry i typed it wrong. The profit made when t units are sold, t>0, is given P=t²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).
*July 7, 2011*

**Algebra II**

The profit made when t units are sold, t>, is given by P²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).
*July 7, 2011*

**Algebra II**

f(x)= 1/(x+2) i have to graph this, can some one please help me!
*July 4, 2011*

**Pre calculus **

f(x)={ x+5, if x>0 3, if x<=0 Graph the function can someone please help
*July 4, 2011*

**Pre calculus **

f(x)={ x+5, if x>0 3, if x<=0
*July 4, 2011*

**Algebra II**

f(x)= 1/(x+2) i have to graph this, can some one please help me!
*July 4, 2011*

**Algebra 2**

f(x)= x+5, if x>0 3, if x<=0 how do i graph and solve this function?
*July 3, 2011*

**Algrbra II**

f(x)= x+5, if x>0 3, if x¡Ü0 and how would i graph this?
*July 3, 2011*

**Algebra **

use factoring to solve the equation 4x²-23x=6 I think the answer is x=-1/4,x=6 Just want to make sure thats right
*July 3, 2011*

**Algebra II**

5/(x-3)
*July 3, 2011*

**Algebra II**

Find the inverse of the function: f(x)=-x²+16, x≥0 f(x)=5/x-3
*July 3, 2011*

**Algebra II**

If an object is propelled upward from a height of 16 ft at an initial velocity of 80 feet per sec, the its height after t seconds is given by the equation h=-16t²+80t+16, where h is in feet. after how many seconds will the object reach a height of 116 ft?
*July 3, 2011*

**Algebra II**

A projectile is thrown upward so that its distance above the ground after t sec is given by h(t)=-11t²+264t. After how many seconds does it reach its maximum height?
*July 3, 2011*

**Pre calculus **

Please help me! Find the exact solutions to the quadratic equation in the complex numbers. (x-13)²=-36
*July 3, 2011*

**Algebra II**

Given the folllowing revenue and cost functions, find the maximum profit. R(x)=72x-2x²; C(x)=24x+93.
*July 1, 2011*

**MATH**

If the average cost per unit C(x) to produce x units of plywood is given by C(x)= 1200/x+40, What it the unit cost for 800 units? How much do 800 units cost in all?
*June 7, 2011*

**Mathematics**

At football practice, players do a 20-minute warm-up before starting their practice drills. After the practice drills, they do a 10-minute cool-down. The expression 20+d+10 describes the length of practice, where d is the number of minutes the practice drills last. How long, ...
*June 1, 2011*

**science**

which two gases have been added to Earth's atmosphere in large amounts and are believed to have increased global warming by absorbing infrared radiation? 1. neon and argon 2. chlorine and nitrogen 3. hydrogen and helium 4. methane and carbon dioxide
*May 28, 2011*

**chemistry**

Give the formula of lead iodide showing all working. You must use knowledge about atoms and electron configuration to explain answer. Thanx :)
*May 23, 2011*

**Calculus**

How do you integrate a radical function such as f(x)= ã(7&4x^5 )- 3ã(6&x^5 )- 11∜x +3∛x ? Describe your strategy.
*May 22, 2011*

**Biology**

Habitat limits result in a populations A)salinity B) temperature C) physical obstacles D) biogeographic range
*May 2, 2011*

**Math**

Find the distance between the two points of each pair. Found to the nearest tenth. (1,5) , (5,2) Is the answer 4.5?
*May 2, 2011*

**math**

So no?
*May 1, 2011*

**math**

Mr.perez is trying to move a circular folding table with a 4 foot radius through a window that measures 5 ft by 3 ft. He plans to lean the table over and move it through the diagonal of the window. Will the table go through the window?
*May 1, 2011*

**Math**

Idk u tell me
*May 1, 2011*

**chem**

@ 46degress C a 1L sample of ammonia gas has a prssure of 5.3 atm. what is the pressure in atm on the sample when the volume is reduced to 100ml with no temp change?
*April 25, 2011*

**Compound math**

(Future Value) Suppose you invest $8000 into an account that pays an annual interest rate of 6.2%. How much is in the account after 30 years if a. simple interest is compound monthly? b. interest is compounded monthly? c. interest is compounded daily?
*April 19, 2011*

**human resources**

I am preparing a line budget and a functional budget. I need to know how a functional budget example look. There are two different programs; one program uses 60% and the other 40%, I need an example of how the budget should actually look.
*April 17, 2011*

**english**

Education in financial planning teaches (simple present tense) me how to save money for my children’s college education. Could someone tell me if this is correct?
*April 16, 2011*

**CHEMISTRY**

What atomic orbital has the quantum numbers n = 3, l = 1, ml = -1?
*April 13, 2011*

**CHEMISTRY**

In the emission spectrum of hydrogen what is the wavelength of the light emitted by the transition fro m n = 4 to n =2.
*April 13, 2011*

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).
*April 10, 2011*

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).
*April 10, 2011*

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).
*April 10, 2011*

**CHEMISTRY**

Determine the heat of combustion of acetylene (C2H2).
*April 10, 2011*

**chemistry**

A 6.58g sample of compound was placed in a 12.6 L container. At 25.0*C, the pressure was found to be 0.75 atm. what is this compound?
*April 7, 2011*

**math**

Ben can complete 4 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 17 math problems?
*April 5, 2011*

**8th grade math**

If two numbers are relatively prime, what is their LCM? Explain your reasoning and give 2 examples supporting your answer.
*March 30, 2011*

**8th grade math**

The denominator of a fraction is 4 more than the numerator. If both the denominator and the numerator are increased by 1, the resulting fraction equals ½. What is the original fraction?
*March 30, 2011*

**physics**

This is wrong. The 0m/s should be with the mass of the target, not of the arrow.
*March 28, 2011*

**maths**

height=6 feet length=5 feet breadth=4 feet volume of the container=120 cubic feet how do you convert it into litres?
*March 23, 2011*

**maths**

height=6 feet length=5 feet breadth=4 feet what is the volume of the container in liters?
*March 23, 2011*

**Math**

there are 3 red marbles , 3 blue marbles and 1 green marble in a bag. A marble is drawn at random from the bag and not replaced. Then a second marble is drawn. What are all the possible outcomes?
*March 3, 2011*

**Math**

Is it b
*March 2, 2011*

**Math**

A triangle has 2 angles that measure 60 each. Which of the following best describes thiz triangle. A. Right isoseles triangle B. Equilateral triangle C. Obtuse isosceles triangle D. Acute scalene triangle
*March 2, 2011*

**Math**

Every morning Leah runs about 5/8 mile. At this rate, about how many miles does leah run in 2 weeks?
*February 16, 2011*

**Math**

Find two numbers with a sum of -8 and a difference of 4. Let x be the greater number and y be the lesser number?
*February 15, 2011*

**MATH**

Describe the advantages and disvanteges of seeing a rule for a function rather than listing a function values in a table
*February 13, 2011*

**Pre-A;lgebr**

Write a rule for the linear function with slope m and y-intercept b. m= -1/3, b= -2
*February 13, 2011*

**chemistry**

The total pressure in a 11.3 L automobile tire is 44 psi at 11°C. By how much does the pressure in the tire rise if it warms to a temperature of 29°C and the volume remains at 11.3 L?
*February 10, 2011*

**Math**

y= 3/5x - 6 x= 4
*February 7, 2011*

**physics**

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 9.30 m/s and her body makes an angle of 83.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude ...
*February 7, 2011*

**Algebra**

have no idea how to do this... divide and write your answer WITHOUT exponents. -11.2 x 10^-7 _______________ = 1.6 x 10^-2
*February 5, 2011*