Friday

September 30, 2016
Total # Posts: 155

**chemistry**

How many kilojoules are required to melt 15g of ice at 0 degrees C, and raise the temperature of the liquid that forms to 85 degrees C?

*September 19, 2016*

**math**

a new statue with a circular base is being unveiled. The statue's base has a radius of 8 ft. What is the area of the base? Round to the nearest whole number. Use 3.14 for p.

*March 11, 2016*

**Physics**

You seem to be missing coefficients of friction.

*December 15, 2015*

**World history **

How did the status of slaves in African society contrast with the Americas? What rights and opportunities were available to slaves in African but limited or prohibited in the Americas ?

*December 4, 2015*

**English**

What is theme to The Wrong Place?

*July 23, 2015*

**Chemisty**

I did round to fit the sig figs but wasn't sure if I was to add decimals or not

*June 26, 2015*

**Chemisty**

What I am getting at is that the delta H given is for the product of the equation. Now, considering the number in front of it, you should divide the delta H by that number to get the delta H for one mol. From there you would multiply it by the mol of the product. So the answer...

*June 26, 2015*

**Chemisty**

So would it be: 24/18=1.33 1.33(-571.6)=-761 kJ

*June 26, 2015*

**Chemisty**

If I was given a question like this, I would just find the moles of the mass given and multiply it by the enthalpy change?

*June 26, 2015*

**Chemisty**

I need a recap of how to do the question below. I just need the basic guidelines: The enthalpy change for the reaction 2H2(g)+O2 > 2H2O is -571.6kJ. Determine the enthalpy change for the decomposition of 24.0g H2O.

*June 26, 2015*

**math**

Landyn wants to mix concentrate and water together to make her juice. The juice is 15% concentrate and 85% water. Her pitcher can hold 12 cups of juice. How many cups of concentrate does she need?

*March 25, 2015*

**math**

A small plane is flying a banner is 144 square feet. The width of the banner is 1/4 the length of the banner. What are the dimensions of the banner?

*February 2, 2015*

**chem**

A solution of ammonia and water contains 3.80×1025 water molecules and 5.80×1024 ammonia molecules. How many total hydrogen atoms are in this solution?

*January 21, 2015*

**US history**

idgaf

*January 19, 2015*

**Math**

Write 5+7+9+11+13+15+17 in sigma notation.

*January 9, 2015*

**Physics**

I don't completely understand what this question is asking: Three people are standing on a horizontally rotating platform in an amusement park. One person is almost at the edge, the second one is (3/5)R from the center, and the third is (1/2)R from the center. Compare ...

*December 15, 2014*

**physics**

A person sitting in a chair (combined mass 80kg) is attached to a 6m long cable. The person moves in a horizontal circle. The cables angle is 62 degrees below the horizontal. What is the persons speed? Note: the radius of the circle is not 6m. I really just need and equation ...

*December 15, 2014*

**Math Question**

Find the values of the six trigonometric functions of an angle in standard position where the terminal side is going through the point (-1, 1). Sinθ = Cosθ= Tanθ= Cscθ= Secθ= Cotθ=

*December 4, 2014*

**PHYSICS**

7, 0

*July 5, 2014*

**Algebra**

what is the magnitude of a vector with an initial point (2,6) and a terminal point (14,11)

*May 19, 2014*

**research**

How is the Spivak and Sharp (2008) study a replication of the prior study by Bales and colleagues (2005)?

*March 14, 2014*

**Finance**

1213

*February 25, 2014*

**math**

The vertices of triangle ABC are A(3, -6), B(6,3), C(9,-3). Find the image matrix that represents the dilation of triangle ABC centered at the origin with a scale factor of 2/3. Then graph the triangle and its image

*December 19, 2013*

**math**

48.631

*December 11, 2013*

**math**

61.348

*December 11, 2013*

**math**

A fisherman has caught a 5kg fish with a line and is lifting it vertically out of the water. While the fish is still in the water he raises it at a constant speed of 0.4 ms^-1. If the water resists this motion with a force of 6N, what is the tension in the line?

*October 26, 2013*

**physics**

three antinodes witha peak to peak displacement of 3 cm are observed on a vibrating string of length l and linear density the hanging mass is m what is the velocity of the propagation of transverse waves of the string

*July 25, 2013*

**Physics**

200 g of ic is at -5C is dropped into a container containing water at 65C. If the final temperature of the mixture reaches 21C, what mass of water must be present in the container?

*July 22, 2013*

**statistics**

Do students tend to improve their SAT mathematics (SAT-M) score the second time they take the test/

*July 16, 2013*

**Math**

forgot to convert so it will be 648.45N?

*July 4, 2013*

**Math**

right is 243N ?

*July 4, 2013*

**Math**

A simply supported beam is 6 meters long and has a mass of 15 kg/m of length. It carries loads = 180 N and 270 N at points 1.2 meters and 3.6 meters from the left end respectively. Find the reactions.

*July 4, 2013*

**science physics**

1.) What is the Magnitude of the electrostatic force on a +5 C charge 1.75 m to the left of a -2.5 C charge? (show your work) 2.) In What direction does the force on the +5 C charge act? 3.)Calculate the magnitude of the electric field of the -2.5 C charge at the location of ...

*May 14, 2013*

**statistics**

Find the standard deviation, Sigma, for the binomial distribution which has the stated values of n and p. Round your answer to the nearest hundredth. n = 639; p = 0.7

*April 14, 2013*

**Finance**

A company has total assets of $8,500,000 and its total turnover of 2.35 times. If the return on assets is 9 percent, what is its profit margin? Please help with a formula?

*March 18, 2013*

**Chemistry**

Comment on the relative acidities of h3po4 and the h2po4 ion? I don't understand what this question is asking? Would H3PO4 is a strong acid and will completely dissociate into ions in aqueous solution suffice?

*February 26, 2013*

**Algebra**

I need to find the slope of a ladder that is leaning against a building. The bottom of the ladder is 9 ft from the building and the top of the ladder is 16 ft above the ground.

*February 19, 2013*

**English**

Did you enjoy the Southern hospitality? What are the adjectives in that sentence?

*January 9, 2013*

**Math 12th grade**

Find the sum of each infinite series, or state that the sum doesn'nt exist 1/7+5/14+25/28+

*December 16, 2012*

**ricon high school**

A 6 kg ball is thrown by a catapult at 30 m/s. what is the ball's momentum?

*December 15, 2012*

**Statistics**

Tony’s father, an accountant, has been listening to Tony tell him about Type I errors and α = .05. He responds: “.05? That means you’re making an error one time in twenty! If I made errors 5 percent of the time I’d be out of a job so fast it would make...

*December 2, 2012*

**Chemistry**

second part = B

*November 29, 2012*

**programming**

Create an application in C# that will accept sales information and calculate the total bill. There are 3 products which can be sold: Product 1 with price of $2.98 Product 2 with price of $4.50 Product 3 with price of $9.75 The application should prompt the user for product and...

*September 30, 2012*

**2nd grade math**

____= 8+2?

*September 26, 2012*

**math**

Is 13/0 considered to be undefined?

*September 23, 2012*

**math**

I have 8 ones and 2 hundreds. I am between 270 and 280. what number am I?

*September 13, 2012*

**math**

i have fewer ones than tens. the value of my tens is 30.what two numbers can i be

*September 5, 2012*

**Math**

i got 24.81 would that be correct?

*August 21, 2012*

**please check**

y^2=1/2x^3 y=ã1/2x^3 y=1/1.41x^(3/2) derivative dy/dx=3/2.82^(1/2)

*August 21, 2012*

**Math**

Please help: find the length of the curve 2y^2 = x^3 from the origin to x=10.

*August 21, 2012*

**Math**

the acceleration of a particle is defined by the equation a= 4-t^2 with an initial velocity of two millimeters per second. Find the exact equation for the position of the particle if its initial position was zero.

*July 20, 2012*

**algebra**

during the first part of a trip, a conoeist travels 70 miles at a certain speed. the canoeist travles 7 miles on the second part of the trip at a speed of 5 mph slower. the total time for the trip is 5 hrs. Ehat is the speed on each part of the trip?

*July 6, 2012*

**algebra**

The speed of a passenger train is 16 mph faster than the speed of a freight train. The passenger train travles 300 miles in the same time it takes the freight train to travel 220 miles. find the speed of each train

*June 22, 2012*

**Calculus**

x^2-5/x lim x=0^+

*April 26, 2012*

**calculus**

Find the total differential for f(x,y,z)= cos(4x+3y+2z+1)

*April 23, 2012*

**calculus**

Just doing example questions to better understand. Find all first and second partial derivatives for the function u= xy^2+x^2y

*April 23, 2012*

**PHI 103**

In the truth table for an invalid argument

*April 14, 2012*

**calculus**

find dy/dx if y= (x^5)(e^(x^4))

*March 6, 2012*

**math**

hmmm bobpursly, i doubt a "basketball" player, one word not two,would pull out a compass mid court to calculate, but it is exactly what happens in their mind, if not just as an approximation of the definitive exact. I'm sure that there are several "...

*February 17, 2012*

**geometry**

An airplane descends 3.5 miles over a horizontal distance of 25 miles. How far did the plane actually travel?

*January 18, 2012*

**Math**

2 2/5 hours is 132 minutes 132*3/8 is equal to 45 3/4 minutes

*December 30, 2011*

**math**

(624*3)/8

*December 30, 2011*

**ALGEBRA 1 help**

That's correct.

*December 30, 2011*

**ALGEBRA**

Correction* The middle number is -5 and so the factors will have - signs rather than + signs

*December 30, 2011*

**ALGEBRA**

multiply the term on the left with the term on the right. In this problem, 2*2 That will give you 4. Now you need to find two numbers that will multiply to 4, and also add to equal the middle number. In this problem the middle number is 5. So, we need two numbers that multiply...

*December 30, 2011*

**MATH**

Any fraction is undefined when the denominator is equal to zero. In this problem the denominator is 2x-6. In order to find what value of x is needed to make the denominator zero, set it equal to x and solve. 2x-6=o 2x=6 x=3 Therefore, this fraction is undefined (or has a ...

*December 30, 2011*

**math**

x+(x+250)=420 2x+250=420 x=85 85+250=335 Therefore, 335 acres of corn and 85 acres of pumpkins

*December 30, 2011*

**math**

335 acres of corn 85 acres of pumpkins

*December 30, 2011*

**math**

x+x+3x+3x=44 8x=44 x=5.5 L=3x=16.5cm W=x=5.5cm

*December 30, 2011*

**geometry**

9z+9=180 9z=171 z=171/9 z=19

*December 30, 2011*

**finance**

Company sales and profits grow at a rate of 30% per year; at the end of 4 years (t4) the growth rate drops to steady 5%. Company recently paid a dividend of $1 per share, and the required return is 20%. What is the value of one share today (t0)? assuming dividends grow at same...

*December 29, 2011*

**algebra**

Marlene drive 540 miles to visit friend. drive for 3 hours then stopped for gas, then drive 4 more hours stopped for lunch. how many more hours do I drive if my average speed for trip is 60 miles per hour ? How would I write an equation?

*December 8, 2011*

**AP Government**

Is this not what she was looking for? Sorry.

*November 2, 2011*

**AP Government**

House of Representatives Standing Committee Operation The House of Representatives has many types of committees.. They include standing committees, subcommittees, select committees, study committees, and advisory committees. This memo focuses on standing committees. The House ...

*November 2, 2011*

**MATH**

MIKE HAS 2 MATS THAT ARE IN THE SHAPE OF TRIANGLES THE SCALE FACTOR OF THE 2 TRIANGULAR MATS IS 7/9 WHAT IS THE RATIO OF THE PERIMETERS?

*November 2, 2011*

**Physics**

A 95 kg rowboat is initially at rest, until it is pulled toward the dock with a rope with a tension of 30.0 N. The dock is higher than the boat, and the rope makes an angle of 25° at the place where it meets the boat. What is the acceleration of the boat? 0.080 m/s2 0.29 m...

*October 31, 2011*

**math**

23x17 in expanded algorithm

*September 22, 2011*

**calculus**

does the sequence a=(2n)! / n! converge? Explain

*September 1, 2011*

**Statistics**

A game is played using one die. There is a$1 charge to play the game. If the die is rolled and shows a five, the player receives $6 back ( a profit of $5 and the original $1). If any other number shows, theplayer loses the original $1. What is the player's expected value...

*July 16, 2011*

**Statistics**

A game is played using one die. There is a$1 charge to play the game. If the die is rolled and shows a five, the player receives $6 back ( a profit of $5 and the original $1). If any other number shows, theplayer loses the original $1. What is the player's expected value...

*July 16, 2011*

**Statistics**

There are 6 batteries. Two are defective. If you pull out two batteries, what is the probability that neither are defective? Is this how you solve it? 4/6 X 3/5

*June 20, 2011*

**rainwater**

What would cause rain water puddle to turn black in color

*June 19, 2011*

**physics**

MAN WHY YOU THROWIN BALLS MAN I DONT EVEN KNOW

*May 30, 2011*

**calc **

Let f(3) = 0, f '(3) = 6, g(3) = 1, and g '(3) = 1/3. If h(x) = f(x)*g(x), find h '(3).

*April 30, 2011*

**calculus**

Choose the correct quantity to fill in the blank: Integral_______ dx = (ax2 - a2)4 + C.

*April 30, 2011*

**calculus**

Choose the correct quantity to fill in the blank: Integral_______ dx = (ax2 - a2)4 + C.

*April 30, 2011*

**Math**

Len flipped a coin 3 times and got a head each time. What are the chances he will get a tail on his next toss? Explain reasoning. would it be 50/50 because there are two sides

*March 21, 2011*

**Algebra Help please**

12(74y - (6+5Y - 8Z) = Please show work

*March 16, 2011*

**Algebra**

12(74y - (6+5Y - 8Z) = Please show work

*March 15, 2011*

**Algebra**

12(74y - (6+5Y - 8Z) = Please show work

*March 15, 2011*

**Algebra**

12(74y - (6+5Y - 8Z) = Please show work

*March 14, 2011*

**Math**

Mrs Sue thank you and you are the best

*March 10, 2011*

**Math**

Does anyone know the old formula to calculate a hourly raise from a percentage; I totally forgot. The employee makes $10.50 an hour and is receiving a 1.1% increase.

*March 10, 2011*

**Chemistry**

"A voltaic cell is constructed by immersing a strip of sillver metal in a 1.0 MAgNO3 solution and a strip of cadmium metal in a 1.0M Cd(NO3)2 solution. The circut is completed by a wire and a salt bridge in the usual way. a. Write the balanced overall cell reaction. b. ...

*March 10, 2011*

**physics**

Outside air generally contains some water vapor (typically 1-2% by mass). Does it take more, less, or the same heat to raise the temperature of 1kg moist air than is needed to raise the temperature of 1kg dry air by the same amount?

*February 8, 2011*

**physics**

water 20 degrees celsius flows through a 25 mm diameter pipe at a rate of 50 liters per minute. is this laminar or turbulant flow or both?

*February 8, 2011*

**math**

250mg is equal to what percent of a gram or grams

*February 1, 2011*

**Stats**

Use this table to answer the questions. Height (in inches) Frequency 50-52 5 53-55 8 56-58 12 59-61 13 62-64 11 1. Identify the class width. 2. Identify the midpoint of the first class. 3. Identify the class boundaries of the first class. 4. Give the relative frequency for ...

*December 16, 2010*

**physics**

Take the mass of the Earth to be 5.98 × 1024 kg. If the Earth’s gravitational force causes a falling 52 kg student to accelerate downward at 9.8 m/s2, determine the upward accelera- tion of the Earth during the student’s fall. Answer in units of m/s2.

*November 28, 2010*