# Posts by Alex

Total # Posts: 3,749

**chemistry**

oops sorry I meant to post that one as a new question ^

**chemistry**

What is a liquid that exhibits abnormal behaviour when it solidifies? It has to be a liquid other then water, and I'm really struggling to find it. I appreciate the help!

**chemistry**

What would a substance that boils at 70 degrees celsius at 30 kPa be? I'm really not sure on how to find this.

**Language Arts**

Act 2 of A Christmas Carol: Scrooge and Marley contains several messages. In a paragraph, explain how one of these messages are conveyed in the second act of the play. Include at least two details from the play to support your points.

**physics **

When a guitar string is sounded against a 440Hz note, 12 beats are heard in 2.0s. a) what are the possible frequencies of the string? b) when the same string is sounded against a 435Hz note, 33 beats are heard in 3.0s. What is the frequency of the string? I honestly am very ...

**chemistry**

What is something that would lower the freezing point of water to -3.7 degrees C if one mole were placed in 1000g of water? I'm not sure how to go about this, I appreciate your help. (:

**precal**

a coin tossed upward from a balcony 330ft high with an initial velocity of 32/sec. During what interval of time will be the coin be at a height of at least 90ft?

**Macroeconomics**

In graph form, what will a decrease in marginal propensity to import look like?

**Random**

well it is random, it's an optional question from my homework and was just wondering if any one is interested in solving it

**Random**

no its called geometry, but I feel that it's just another one of my teacher's random questions

**Random**

A room has five corners, one of the five has an angle is 179 degrees what would be the measure meant of the other angle if the sum of two of the unknown angles is 60 and the sum of the other two is 3 less than the sum of the first two. my first question is, IS THIS EVEN ...

**calculus**

Find the area of the shaded region. r^2=sin(2?).

**calculus**

Find the slope of the tangent line to the given polar curve at the point specified by the value of ?. r=6/?, ?=?

**calculus**

Find a Cartesian equation for the curve and identify it. (r^2)cos(2?)=1

**calculus**

Find the exact area of the surface obtained by rotating the given curve about the x-axis. x=t^3, y=t^2, 0 ? t ? 1

**calculus**

Find the area enclosed by the curve x = (t^2)-2t, y = (t)^(1/2) and the y-axis.

**Physics**

Simple Harmonic Motion Problem Amplitude=10cm=0.1m , period=1s, angular frequency= 6.28 rad What is the maximum speed of the mass during this motion?

**calculus**

Find an equation of the tangent to the curve at the point corresponding to the given value of the parameter. x=tcos(t), y=tsin(t); t=?

**calculus**

x = sin(?/2), y= cos(?/2), ?? ? ? ? ?. Eliminate the parameter to find a Cartesian equation of the curve.

**calculus**

The differential equation below models the temperature of a 87°C cup of coffee in a 17°C room, where it is known that the coffee cools at a rate of 1°C per minute when its temperature is 67°C. Solve the differential equation to find an expression for the ...

**calculus**

Find the exact area of the surface obtained by rotating the curve about the x-axis. y=((x^3)/4)+(1/3X), 1/2?X?1

**programming**

Write the pseudocode for an application that accepts enter eight friends’ first names and displays them in alphabetical order

**Physics **

At a nuclear power plant, water at 6degress Celius from a nearby lake is used in a heat exchange to condense spent steam at a temperature of 115 degees C to water at 80 degrees C. If the cooling water returns to the lake at a temperature of 18 degrees C, what mass of lake ...

**physics**

The answer is 9.6x10^6 J but I don't know how to get there. Thank you!

**physics**

An air-track cart with mass m1=0.29kg and initial speed v0=0.95m/s collides with and sticks to a second cart that is at rest initially. Part A If the mass of the second cart is m2=0.55kg, how much kinetic energy is lost as a result of the collision?

**pals help**

An air-track cart with mass m1=0.29kg and initial speed v0=0.95m/s collides with and sticks to a second cart that is at rest initially. Part A If the mass of the second cart is m2=0.55kg, how much kinetic energy is lost as a result of the collision?

**physics**

An air-track cart with mass m=0.20kg and speed v0=1.5m/s approaches two other carts that are at rest and have masses 2m and 3m, as indicated in (Figure 1) . The carts have bumpers that make all the collisions elastic. Find the final speed of cart 1, assuming the air track ...

**psychology**

In a normal distribution, what percentage of scores will fall between one standard deviation below the mean and one standard deviation above the mean?

**physics**

Thank you!!

**physics **

What mass of hot water at 70 degrees C must be added to 2000g of cold water at 5 degrees C to raise it's temperature to 20 degrees C? To be honest I really don't have any idea how to do this question. I would really appreciate help, thank you

**Differential Equations**

Verify whether the given equation(y=c1-cos(x+c2)) is a solution to this equation[(d^2y/dx^2)^2 + (dy/dx)^2 - 1 = 0].

**Physics**

Suppose that you place a square block of wood with dimensions 12.0 cm x 12.0 cm x 6.0 cm into some water as shown below. The wood has a density of 600 kg/m3. What is the distance from the bottom horizontal face of the block to the surface of the water? (In other words, how ...

**Physics**

Water flows into one end of a horizontal, cylindrical pipe at 2.0 m/s. The pipe then narrows until its diameter at the opposite end is only 1/3 of that at the beginning. (a) What is the flow speed at the narrow end of the pipe? (b) What is the pressure difference between the ...

**calculus**

Find the exact length of the curve. x=(y^4)/8+1/(4y^2), 1 ? y ? 2.

**s.s.**

oh yes, thanks.

**s.s.**

Malcolm X believe was the path to equality was what please help

**Chemistry**

An electron is in the 5f orbital. What are the values or sets of values for… a. The principle quantum number (n)? b. The angular momentum quantum number (l)? c. The magnetic quantum number (ml)?

** physics**

A skateboarder at a skate park rides along the path shown in (Figure 1) . a=2.7 m and b=1.0m If the speed of the skateboarder at point A is v=1.6m/s, what is her speed at point B? Assume that friction is negligible.

**Statistics**

The director of the library believes that 25% of the library's collection is checked out. If the director is right, what is the probability that the proportion of books checked out in a sample of 545 books would differ from the population proportion by less than 5%? Round ...

**Program Design and Developmen**

Design a class named TextBook that is a child class of Book. Include a new data field for the grade level of the book and get and set methods for the new field. Provide the pseudocode for the TextBook class Very basic pseudo code is what we're dealing with. New to OOP and ...

**calculus**

Determine whether the integral is convergent or divergent.If it is convergent, evaluate it. from 0 to infinity e^(-y^1/2)dy

**calculus**

Determine whether the integral is convergent or divergent.If it is convergent, evaluate it. form -infinity to 0 x/(x^4+25)dx

**Chemistry**

PLEASE HELP! Consider the following galvanic cell: Ag(s) | Ag+(aq) || Cu2+(aq) | Cu(s)? Match the components with their function in the cell. 1. | 2. || 3. Ag(s) | Ag+(aq) 4. Cu2+(aq) | Cu(s) A. Cathode Half Reaction B. Phase boundary C. Salt Bridge D. Anode Half Reaction

**Chemistry**

For the galvanic cell that uses the reaction 2 Al(s) + 3 Ni2+(aq) ? 2 Al3+(aq) + 3 Ni(s) the value of n in the relationship ?G° = -nFE° is ________.

**World History**

How did the relgion of the israelites differ from the religions of others in the surrounding area Only the Israelite religion taught protection of the poor and weak Only the Israelite religion taught moral standards of behavior Only the Israelite religion taught that there was...

**math**

Use the variable v to represent Vanessa's score.

**History**

Which of these was President Lincoln's central goal during the Civil War? A.To end slavery in all U.S. states B.To preserve the Union****** C.To keep the U.S. economy from collapsing D.To punish the Southern states for seceding Is it B

**MATH!!! CHECK ANSWER**

They're right!

**Math Help**

I got the answer of x = 2

**Math Help**

I tried I don't understand...

**Math Help**

An equation is shown below: 4(2x - 5) + 15 = 11 Write the steps you will use to solve the equation and explain each step. Can someone please explain step by step this equation? Thanks!!

**Math (Check 2 answers please)**

Thank you!!

**Math (Check 2 answers please)**

1. What is the value of b in the equation b + 8 = 13? A. 5**** B. 8 C. 13 D. 21 2. The steps below show the incomplete solution to find the value of x for the equation 7x ? 3x ? 4 = ?1 + 21: Step 1: 7x ? 3x ? 4 = ?1 + 21 Step 2: 7x ? 3x ? 4 = 20 Step 3: 4x ? 4 = 20 Which of ...

**Math Help**

I solved it and got A is that correct?

**Math Help**

Would it be A

**Math Help**

What is the value of x in the equation 3(2x + 4) = ?6? A. ?3 B. 1 C. 12 D. 19 Please explain this I'm having difficulties with this equation, I don't want to fail and loose my A in the class. Thank you.

**physics **

a) a driver of mass 55kg needs to jump to a height of 1.1m above her take off height, at which point her speed needs to be 0.5m/s^. How fast just she be travelling the instant her feet leave the diving board? So we know eg=mgh =9.8*55*1.1 I assumed we're trying to find the...

**physics**

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure (Figure 1) . Part A If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car as ...

**math**

List the real zeros and multiplicity of f(x)=-5(x^2+25)(x-3)^3

**math**

Is the function a polynomial function? Why or why not? If it is a polynomial function identify and label the leading term and constant term. Here are the functions f(x)=(2-x^4)/13 f(x)=x^3+9x-(1/x) it would be great if you could do everything step by step and showing your work.

**chemistry**

I need help. please show step by step? How many milliliters of 1.0 M NaOH would be required to completely neutralize 40.0 mL of 0.60 M HCl?

**chemistry**

so here are the answers for a) NaOH + HCl ? NaCl + H2O (15.3 mL) x (0.7034 M NaOH) x (1 mol HCl / 1 mol NaOH) / (0.831 M HCl) = 12.95 mL HCl b) CaCO3 + 2 HCl ? CaCl2 + CO2 + H2O (30.0 mL HCl total) - (12.95 mL HCl for NaOH) = 17.05 mL HCl for the CaCO3 how would I solve the ...

**chemistry**

A 5.309 g antacid tablet, with CaCO3 as the active ingredient, was mixed was 30.0 mL of 0.831 M HCl. After the reaction occurred, it took 15.3 mL of 0.7034 M NaOH to neutralize the excess acid. a) How much HCl (in mL) of was neutralized by NaOH? b) How much HCl (in mL) was ...

**Chemistry**

PLEASE HELP! Consider the following galvanic cell: Ag(s) | Ag+(aq) || Cu2+(aq) | Cu(s)? Match the components with their function in the cell. 1. | 2. || 3. Ag(s) | Ag+(aq) 4. Cu2+(aq) | Cu(s) A. Cathode Half Reaction B. Phase boundary C. Salt Bridge D. Anode Half Reaction

**Chemistry**

Thank you guys sooooooo much! You are really helpful!

**Chemistry**

Thanks, and for the #1 how do we get the [oh-] of Naoh to add to the total?

**Chemistry**

When they multiplied concentration of NaOH with the total volume wouldn't that give you moles? That part is confusing to me, I'm unsure what to do next.

**Chemistry**

Please help! I'm trying to find the solubility of Ca(OH)2 in .001305 mol/L aqueous NaOH? Saturated solution of Ca(OH)2 in 0.01305 mol/L NaOH. [HCl] = 0.1213 M Volume of HCl = 9.81 mL Volume of Ca(OH)2/NaOH aliquot = 25ml Find: 1. the TOTAL [OH-] in the saturated solution ...

**Pre-Algebra**

The wind blew away 12 of your muffins. That was 3/7 of all of them. How many are left?

**computer programming**

Create the logic for a program that accepts input values for the projected cost of a vacation and the number of months until vacation. Both values must be greater than zero. Pass both values to a method named displaySavingsAmt(cost, months) that displays the amount you must ...

**history**

is it A or D

**history**

What was the overall goal of the Berlin Blockade? To Make the Allies embrace Communism To make the Allies leave Berlin, so that the USSR could control it all. To show the strength of the USSR To punish East-Berliners for living on the other side of the Berlin Wall

**chemistry**

help please write the phases for the following equation Sr(NO3)2+2KIO3+H2O-----> Sr(IO3)2*H2O+2KNO3 and also write the net ionic equation

**math**

15.34

**geography **

What is the difference in Longitude between town A and town B whose local time are 8:00Am and 3:00Pm respectively?

**physics**

Objects deep beneath the surface of the ocean are subjected to extremely high pressures. Some bacteria in these environments have adapted to pressures as much as a thousand times atmospheric pressure. How might such bacteria be affected if they were rapidly moved to the ...

**Health**

Thank you

**Health**

1- what effect does a baby have on a teenage couple? A- brings the couple closer together B-school and education is unefected C-Mother drops out of school(my answer) D-physical maturity gets stronger

**Math**

Two integers differ by four, with the property that the sum of their reciprocals is the same as 14 times the product of their reciprocals. What are the two integers?

**Health**

Thank you anyway

**Health**

1-HIV positive people receive treatments to keep. A-their viral load as high as possible B-their viral load as low as possible(my answer) C- their viral load as equal to their t-cell count D-their t-cell count as low as possible

**Social studies**

100%right thanks

**college chemistry**

Calculate how much carbon you use in a year, by considering how much driving you do a year. If I use 500 gal per year, what is my answer? balanced combustion equation which shows how the main component in gasoline reacts in your car and produces carbon dioxide: 2C8H18(l) + ...

**COLLEGE CHEMISTRY**

write the net ionic equation (including phases) that corresponds to zn(no3)2 + Na2CO3--->ZnCO3+2NaNO3.

**college chemisrt**

write the net ionic equation (including phases) that corresponds to zn(no3)2 + Na2CO3--->ZnCO3+2NaNO3

**Political Science**

President Clinton was not convicted by the Senate for perjury (i.e., lying under oath). The Senate found his actions did not constitute a high crime and misdemeanor. If a federal judge acted similarly (i.e., lied on the stand in regard to an extramarital affair), would the ...

**Political Science**

Should the same impeachment process and standards be used for judges, justices, and presidents? Are the same process and standards used?

**chemistry**

How many grams of O2(g) are needed to completely burn 17.3 g of C3H8(g)?

**chemistry**

Complete combustion of 4.20 g of a hydrocarbon produced 13.4 g of CO2 and 4.81 g of H2O. What is the empirical formula for the hydrocarbon?

**Pre-aljebra**

a rectangular dog pen is to be constructed so that one side is against an existing stone wall and the other three sides are to be fenced. of 500 feet of fence is to be used, determine the dimensions and area of the pen with maximum area. I have no idea how to solve this problem.

**biology **

If allele frequencies change, natural selection must be acting in some way. True or False?

**biology **

A devastating tsunami wipes out most of the population of a frog species that lives on just one tropical island. What is the most likely outcome of this event? A) frequency-dependent selection B)inbreeding depression C)rapid adaptive evolution D)purging of all deleterious ...

**Math**

A section of stained glass is made by placing a circle at the top of a triangle with a base of 10 centimeters and a height of 8 centimeters. The diameter of the circle is equal to the height of the triangle. What is the area of the section of stained glass? Show your work. Use...

**8th grade math**

thanks 100%

**Science **

Relate to some objects your nose is in motion when you run. Relate to others it is not motion. Give one example of each

**social studies**

Yes, James is correct. D C D A

**Linear Algebra**

Hi, well I have the next question: How can I show that the sum of two eigen values is not another eigen value? I know that I can give an example, but is ther another way to solve?, please help...

**Accounts**

I have prepared Income Statement, Statement of Stockholders Equity and Balance Sheet of company and need to know if it is correct or not. imgur. com/HHPU5GO imgur. com/f2VQfNu imgur. com/QqBAarR

**physics**

Place a coin on top of a sheet of paper on a desk or table. Pull the paper horizontally with a quick snap. What concept of physics does this illustrate?

**Math**

A marketing expert determines that sales of television sets an be increased by 3 sets per week for each $20 decrease in price. Weekly sales average 18 sets at $440 each. What price should be given in order to receive $10,800 in revenue?