Tuesday

January 24, 2017
Total # Posts: 799

**Chem**

Calculate ΔG∘ at 298 K for the following reactions. A) Ca(s)+CO2(g)+12O2(g)→CaCO3(s) B) 2KClO3(s)→2KCl(s)+3O2(g) C) CO(g)+H2O(g)→H2(g)+CO2(g)

*May 14, 2014*

**programming**

3. Create the logic for a program that accepts input values for the projected cost of a vacation and the number of months until vacation. Pass both values to a method that displays the amount you must save per month to achieve your goal.

*May 13, 2014*

**Health question**

Sage is right it is D

*May 8, 2014*

**science**

How is that right if the question just said it is too small to see with a dissecting microscope

*May 7, 2014*

**Chemistry**

Consider the following reaction at constant P. Use the information here to determine the value of ΔSsurr at 398 K. Predict whether or not this reaction will be spontaneous at this temperature. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g); ΔH = -1267 kJ A)ΔSsurr...

*May 5, 2014*

**physics**

Your vertical spring accelerometer has a 40 g mass hanging from it. You climb aboard the roller coaster that starts at rest and watch the accelerometer read 0.45 for 5 seconds while descending the first peak and then change to 2.8 for 2.5 seconds while going through the bottom...

*April 28, 2014*

**math**

A movie theater ticket booth opens at 10 am. There are four tellers who divide the customers evenly. The tellers have served 16 customers so far this morning. which expression represents the unknown number of customers each teller will serve? Let c represent the additional ...

*April 22, 2014*

**Trig**

A vertical tower is on a 12° slope. from a 50 m down the hill, the angle of elevation of the top of the tower is 30°. find the height of the tower

*April 15, 2014*

**math**

Sara drives 72 miles on 3.2 gallons of gas. She uses this information to calculate how many miles per gallon she can drive. Using this result, how many miles can Sara drive on 13.3 gallons of gas?

*April 9, 2014*

**CHEMISTRY**

HOW MANYMOLES OF SULFUR DIOXIDE CAN BE PRODUCED FROM 20.0G OF HYDROGEN SULFIDE?

*March 27, 2014*

**science**

A ramp 20m long slopes down 1.2m to the edge of a lake. A force of 300N is needed to pull a boat on a trailer at constant speed up the ramp when they are clear of the water. If friction is negligible, what is the combined mass of the boat and trailer. Hints: Calculate MA of ...

*February 16, 2014*

**Statistics**

The mean of a distribution of 1000 individuals' blood pressure is 85. If this number were translated into a Z score it would be equal to +1 standard deviations. True or False? I know to calculate a Z score the formula is Z= (X-sub-i minus the mean)/ standard deviation. the...

*February 11, 2014*

**Physics**

Police find skid marks 60 m long on a road showing where a car made an emergency stop. Assuming that the deceleration was -10m/s2, how fast was the car going?

*February 9, 2014*

**Math**

What is the solution to the inequality below? 12x > 6(x - 2)

*January 15, 2014*

**Pre-Calculus**

Find an equation of the line that satisfies the given conditions Through (-2,4); slope -1 How would you solve that by using the point slope form and writing it in the general equation of a line? ax +by + c =0

*January 11, 2014*

**Pre-Calculus**

Find an equation of the line that satisfies the given conditions Through (-2,4); slope -1

*January 11, 2014*

**math**

Can someone check my answers: write out each problem with repeated addition. 3*0= 0*13= 20*0= I got 0+0+0 0+0+0+0+0+0+0+0+0+0+0+0+0 0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0

*January 8, 2014*

**3-D Coordinates Polar coordinates Precalculus Trig**

Sorry, never mind. I figured it out.

*December 18, 2013*

**3-D Coordinates Polar coordinates Precalculus Trig**

Hi. I don't understand why you multiply by 50*pi/180. The 50 degrees is the difference in the longitude, but why isn't that divided by 360? Why the pi/180? If someone could clear that up I would appreciate it.

*December 18, 2013*

**Reading Skills**

Hello Sue, the answer is a simile. Please read the following: Each of these he set adrift like a paper boat on a shifting sea of daydreams. He did that encased in the drone and shudder of diesel pistons and hissing tires. Jamie Sabin was going home to a place unknown. With ...

*December 17, 2013*

**Reading Skills**

The answer to this question IS NOT "B". What is the answer to the following question. Inside the bus, in his summer Class-A uniform with its brass glitter and infantry-blue shoulder cordon, Jamie Sabin was going home. Fort Benning would be a fading dream; Preston, ...

*December 17, 2013*

**Reading Skills**

Inside the bus, in his summer Class-A uniform with its brass glitter and infantry-blue shoulder cordon, Jamie Sabin was going home. Fort Benning would be a fading dream; Preston, Virginia, a place unknown, his future. He was in between, fumbling with puzzle pieces, making up ...

*December 17, 2013*

**Reading Skills**

In American society, romantic love is considered the main reason for people to marry. On the other hand, in some societies, romantic love is considered a form of obsession or madness. In fact, even in many societies where "true love" is not considered a form of ...

*December 16, 2013*

**science**

2. According to your text, the groundwater aquifers of India have been severely over pumped. (Points : 1)

*December 15, 2013*

**Math #2**

Can you show me the work to get these answers also? 2.Use the function, f(x)=3x^2-16x+5/(3x-1)(x+4)^2: a. Find the domain of f(x) in interval notation b. Factor and simplify f(x) completely. c. Find the x-intercept(s), if any. d. Find the y-intercept, if any. e. Determine the ...

*December 8, 2013*

**Math #2**

Can you show me the work to get these answers also? 1.Given g(x)=x^3+5x^2+6x+30,find: a. All real/complex zeros. b. All x-intercept(s),if any.

*December 8, 2013*

**Math**

Can you show me the work to get these answers also? A.Solve each equation. Leave exact answers: 1.5^3x-2=14 2.log(x-1)-logx=log(x-3) B.If f(x)=x+2/x and g(x)=7/x-5, a. Find the composition (f o g)(x) and simplify completely. b. Find the domain of (f o g)(x).Write answer in ...

*December 8, 2013*

**Classical Mechanics - Need Help Please**

You beauty, Thanks bw. All I have left is the falling ruler if you have any advice for that one. Otherwise thanks a million!

*December 8, 2013*

**Classical Mechanics - Need Help Please**

bw, For the above question (the block of mass 3kg one) I am still getting the incorrect answer for your answer of c.) 44.99 Is it possible this is incorrect still?

*December 8, 2013*

**Classical Mechanics - Need Help Please**

A block of mass m= 3 kg is initially at rest on a horizontal surface. At time t=0, we begin pushing on it with a horizontal force that varies with time as F(t)=βt2, where β= 1.2 N/s2. We stop pushing at time t1=5 s [F(t)=0 for t>t1]. (a) First, assume the surface ...

*December 8, 2013*

**Classical Mechanics Physics - Urgent help please**

Hey Damon, Part b and c: (b) What is the force exerted by the wall on the ruler when it is at an angle θ=30∘? Express your answer as the x component Fx and the y component Fy (in Newton) Fx= Fy= (c) At what angle θ0 will the falling ruler lose contact with the ...

*December 7, 2013*

**Math**

4x-3y=5 Solve { 5y+7=3x using the method of elimination.

*November 27, 2013*

**Math**

Determine the equation of g(x) that results from translating the function f(x) = x2 + 3 upward 14 units. g(x) = (x + 17)2 g(x) = (x + 14)2 + 3 g(x) = x2 - 11 g(x) = x2 + 17

*November 24, 2013*

**Finance**

I got 68016.92

*November 8, 2013*

**Math**

It's a NUMBER? It is divisible by 3 but not by 9 or 15. It is not an even number and it is less than 90. The sum of it is 12 and it could be the Product of 27..... What NUMBER??

*November 7, 2013*

**Science**

What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?

*October 25, 2013*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) ...

*October 4, 2013*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) ...

*October 4, 2013*

**MircoEcon**

Agree or disagree with this statements and explain: If the demand for a good has unitary elasticity, or elasticity is -1, it is always true that an increase in its price will lead to more revenues for sellers taken as a whole.

*September 30, 2013*

**trigonometry**

the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65^ and 40^ respectively. Find the two legs

*September 1, 2013*

**Math**

If a car is traveling at 60 mph how long would it take to slow to 30 if slammed on the brakes?

*September 1, 2013*

**STATISTICS**

0.003

*August 6, 2013*

**statistics**

Archie must travel to a foreign country where a deadly strain of flu has ravaged the population. Already, 34% of the population has succumbed to the flu and died. There is a vaccine, but because the flu is extremely contagious, it spreads quite rapidly, and to date only 1 out ...

*August 2, 2013*

**bus 123**

Carol Miller went to Europe and forgot to pay her $850 mortgage payment on her New Hampshire ski house. For her 55 days overdue on her payment, the bank charged her a penalty of $26. (assume 360 days). What was the rate of interest charged by the bank?

*August 1, 2013*

**Science**

For example HNO2 + H20 ----> H30+ NO2- I don't understand how the hydronium ions form. How do I figure out if a OH- or H30+ will form from the reactant side.

*July 30, 2013*

**stats**

Cheating is not allowed. HRP258

*July 16, 2013*

**math**

a 5000lb. truck traveling at 30 miles per hr. hits a herd of horses bring the truck to a dead stop what is the force of impact?

*July 7, 2013*

**U.S. Government**

The social group that has the most influence on how you vote is in your --m---.

*June 27, 2013*

**calculus**

In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...

*May 16, 2013*

**calculus**

In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...

*May 16, 2013*

**calculus**

please help me Asap In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in ...

*May 16, 2013*

**Finance**

Calculate the future value of $5000 given that it will be held in the bank for 6 years and arn an annual interest rate of 7%.

*May 8, 2013*

**math**

first one answer: x^2+3x+2

*May 6, 2013*

**geometry**

What are the internal angles required to make a pentagon with 36 millimetre sides?

*May 5, 2013*

**geometry**

What are degrees of angles for pentagon with 36 sides

*May 5, 2013*

**physical aspects**

A 600 lb. oak packing crate is sitting on a cross grained, 14 ft long, oak ramp. The force of the box against the ramp is 520 lbs, and the downhill force on the box is 300 lbs. Will the box slide down the hill all by itself? Give the box a nudge, will it stop? If the box will ...

*May 5, 2013*

**Science-Greenhouse Effect**

idc I got a 8b so its very easy if u put ur head doen and listen to the teacher I'm in year 8

*April 23, 2013*

**Physics**

The cannonball is fired at a speed of 45 and an angle of 35 . A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.8 .

*April 20, 2013*

**Chemistry**

calculate the minimum number of grams of C3H8(g) that must be combusted to provide the energy necessary to convert 3.36 kg of H2O from its solid form at -10.0°C to its liquid form at 80.0°C

*April 15, 2013*

**Chemistry**

3.00 g of H2 reacts with 200.0 g of AgCl. what is the yield?

*April 15, 2013*

**LA**

so its C

*April 10, 2013*

**LA**

can you give me the right answer please

*April 10, 2013*

**LA**

What was the Supreme Court's ruling on the Dred Scott case? Dred Scott should be considered free since he had lived in many states where slavery was banned. Dred Scott could be free if he paid a fee. Dred Scott was still a slave and not a citizen. The case never reached ...

*April 10, 2013*

**Chemistry**

What mass of silver can be produced by reacting 0.300 L of 0.100 M AgNO3 with an excess of Mg?

*April 9, 2013*

**LA**

thanks

*April 8, 2013*

**LA**

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A;Miep wants to show Mr. Frank something in the building. B;Mr. Frank wants to live in this building to hold on to his memories. C;The war has ended, but Mr. Frank does not want to ...

*April 8, 2013*

**chemistry**

Sodium fluoride and lead nitrate are both soluble in water. If 1.13 g of NaF and 0.232 g of Pb(NO3)2 are dissolved in sufficient water to make 1.00 L of solution, will a precipitate form? How do you know if there should be a precipitate or not? What is the chemical formula for...

*April 7, 2013*

**science need help**

2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...

*April 1, 2013*

**science need help**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...

*April 1, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...

*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...

*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...

*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...

*March 31, 2013*

**science**

when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant

*March 31, 2013*

**science**

why the tilt of axis causes summer to be warmer than winter in the northern hemisphere i put because the rays of the sun strike the northern hemisphere more directly in the summer. but it could also be because northern hemisphere is closer to the sun in the summer.

*March 31, 2013*

**Chemistry**

Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added. a)0.0 mL b)20.0 mL c)25.0 mL d)40.0 mL e)50.0 mL f)100.0 mL

*March 23, 2013*

**English**

What is Positive Adverbs

*March 22, 2013*

**math**

Combine the like terms (6a^4b - 6a^4b) + (ab^3 + 3ab^3) = 0a^4b + 4ab^3 = 4ab^3

*March 16, 2013*

**spanish**

what does ella mean

*March 11, 2013*

**physics**

A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?

*March 10, 2013*

**physics**

A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?

*March 10, 2013*

**physics**

A wire that is 0.45 m long and carrying a current of 9.5 A is at right angles to a 0.40 T magnetic field. How strong is the force that acts on the wire?

*March 10, 2013*

**physics**

The force acting on a wire that is at right angles to a(n) 0.80 T magnetic field is 2.1 N. The current in the wire is 6.7 A. How long is the wire?

*March 10, 2013*

**physics**

A wire that is 630 m long is perpendicular to a 0.31 T magnetic field. A 1.8 N force acts on the wire. What current is in the wire?

*March 10, 2013*

**physics**

A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?

*March 10, 2013*

**math**

Solve equation for Y 2x + 8y = 6 8y = 6 - 2x y = 3/4 - x/4 Since this is a straight line, we can pick any value for X. Let's say X=2 Then y(2) = 3/4 - 2/4 = 1/4 Now, decrease x by 2, so x=0 y(0) = 3/4 - 0/4 = 3/4 The difference between Y(0) and Y(2) is 3/4 - 1/4 = 2/4 = 1/...

*February 26, 2013*

**MATH**

Change 1.9 hours into a form we can use. Let's break it into two parts. We know 1 hour is easy enough, and that will change the time to 4:05 PM (Subtract 1 hour from 5:05 PM). For the 0.9 hour part, let's change this to minutes. (0.9 hours)*(60 min / 1 hr) = 54 minutes...

*February 26, 2013*

**geometry**

Keep in mind it does not have to be in ratio of 3:4:5 to be a right triangle, it has to make the equation c^2=a^2+b^2 true. Another common right triangle is 5,12,13.

*February 26, 2013*

**geometry**

No...Use c^2=a^2+b^2. Use a= 24, b= 32 and c= 42 (the longest side). Take a^2 + b^2 and see if it eqauls c^2 If it does, it is a right angle. If it does not, it is not a right triange. In this case, it does not, so it is not a right triangle.

*February 26, 2013*

**Algebra**

2X + 1 r 2/(x-3)

*February 25, 2013*

**Algebra II**

1. Multiply out z^2 + 6z + 14z^2 + 84z + 45 = 0 2. Combine like terms 15z^2 + 90z + 45 = 0 3. Use quadratic equation to get both answers for z.

*February 24, 2013*

**chemistry**

A solution is prepared by mixing 50.7 mL of 0.28 M Pb(NO3)2 with 70.8 mL of 1.0 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6 10-5.

*February 21, 2013*

**Math 10**

Yes, you are correct. Key word is circular, so we are talking about a circle. pi = circumference of a circle / diameter --> pi = C / d Solve for C C = pi*d = (3.14) *(10 ft) = 31.4 ft, assuming the approximation of 3.14 for pi.

*February 19, 2013*

**Math 9**

Think of a right triangle. The airport is the vertex of the right angle. Plane A is 70 miles north (Straight up). Plane B is 168 miles East (Straight right). From plane A to B would be side C of the right triange. C^2 = A^2 + B^2 C = sqrt (A^2 + B^2) C = sqrt (70^2 + 168^2) C...

*February 19, 2013*

**Math 5**

No, look at your answer... Your length is 4 times as long as your width... How did you come up with your answer?

*February 19, 2013*

**college algebra**

If X^2-5 is the denom, then the domain would be all X such that the denom does not equal 0. So find when x^2-5=0 x=sqrt(5) (Both positive and negative) So the domain is all real numbers, such that X does not equal +- sqrt (5)

*February 18, 2013*

**chemistry**

Just wanted to say thanx for the help Bob

*February 18, 2013*

**chemistry**

Greg reacts 5.0 moles of hydrochloric acid(HCL)with 1.5 moles of barium hydroxide(Ba(OH)2).Which reagent is the limiting reagent, and which is in excess?If the reagent runs to completion,how many moles of barium chloride(BaCl2)will be produced? CAN SOMEONE PLEASE HELP ME....

*February 18, 2013*

**Chemistry**

Robby if you need more help,type ur question ino the search bar on your computor and a site titled chap15 fd.valenciacollege.edu will come up and it will break down complete indtructions on how to go about figuring out this question.I hope this helps.

*February 18, 2013*