Tuesday

July 28, 2015

July 28, 2015

Total # Posts: 1,678

**chemistry**

An ethylene glycol solution contains 18.2g of ethylene glycol (C2H6O2) in 85.4mL of water. Calculate the freezing point and boiling point of the solution. (Assume a density of 1.00 g/mL for water.)
*November 19, 2014*

**chemistry**

So would it be Delta T = i*Kf(0 degrees C)*1.40 Delta T/Kf *1.40v= i?
*November 19, 2014*

**chemistry**

Benzene is a carcinogenic (cancer-causing) compound. A benzene-contaminated water sample contains 3.1×10−5% benzene by mass. What volume of the water in liters contains 225mg of benzene? (Assume that the density of the solution is 1.0 g/mL.)
*November 19, 2014*

**statistics**

70% of 8 students would be 5.6, so estimate either 5 or 6
*November 18, 2014*

**calc**

Is the gradient of a function basically like the slope field. Also what is a conservative vector field. I know the definition but I'm having trouble visualizing it Thanks
*November 17, 2014*

**Math 6th**

Andy ran a 5-kilometer race in 40 minutes. If Andy maintains that same place, how many kilometers did Andy run In 1 hour?
*November 16, 2014*

**Social Studies HELP!!**

What can we infer from "they ought to get the sane treatment as Mr. Carlisle? What did Mr. Carlisle do? What was his treatment?
*November 13, 2014*

**chemistry**

A gas mixture is composed of 4.3 grams of hydrogen (density at STP = 0.089 g/L) and 2.9 grams of helium (density at STP = 0.179 g/L). What is the percentage (v/v) helium in the mixture? If v/v = Volume of gas/total volume how would we find the volume of both of the gases?
*November 13, 2014*

**chemistry**

Would the answer be .25596? 8.1/100= .081 .081*3.16= .25596
*November 13, 2014*

**chemistry**

How many liters of CO2 gas are contained in a 3.16 liters of a gas mixture which is 8.1% (v/v) CO2? They never gave us the formula or a process to figure this out in class. Will you please help?
*November 13, 2014*

**Physics**

How fast is an object traveling after 3seconds if its terminal velocity is about 35 m/s.?
*November 12, 2014*

**Physics**

What is the horizontal component of the force of an object sloped at a 45° angle. pulling with a force of 110N.
*November 12, 2014*

**Math**

The number of meters decreased by 25.6 is 84.3 meters.
*November 12, 2014*

**Math HELP!**

Please help me write an equation for these two: Ten fewer than the number of band instruments is 47 instruments. The number of meters decreased by 25.6 is 84.3 meters
*November 12, 2014*

**physics**

An unidentified flying object is cruising 30.0° north of east at a speed of 2132 km/h. How fast is it moving to the north?
*November 12, 2014*

**Social Studies**

What did Samuel Adams and Paul Revere do in the Boston Massacre?
*November 10, 2014*

**Math**

a lab has two bacterial cultures. culture a contains 8×10^4 bacteria and culture B contains 4 × 10^6 bacteria. How do the two cultures compare in size?
*November 10, 2014*

**Math**

Choose a number. Multiply by 2. Add 6 to the product. Divide by 2. Then subtract 3. What is the answer? Repeat this process using two different numbers.
*November 9, 2014*

**physics**

A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration?
*November 8, 2014*

**algebra **

would multiplying 3 negative integers always equal a positive integer?
*November 7, 2014*

**math**

what about 3 negatives? would the product always be positive?
*November 6, 2014*

**math**

is a negative times a negative ALWAYS positive? or can it be negative as well?
*November 6, 2014*

**please help! algebra**

find the next two numbers in the pattern: -12, 60, -300, 1500
*November 5, 2014*

**Math**

X/4 + 7 = 3
*November 3, 2014*

**Math**

-1.4b + 10 = (-18)
*November 3, 2014*

**Math**

2/3y + 6 =15
*November 3, 2014*

**chemistry**

What is the volume occupied by 0.252mol of helium gas at 1.35atm and 305K ?
*October 31, 2014*

**chemistry**

A bag of potato chips contains 575mL of air at 25.0∘C and a pressure of 765mmHg . Assuming the bag does not break, what will be its volume at the top of a mountain where the pressure is 458mmHg and the temperature is 10.0∘C?
*October 31, 2014*

**chemistry**

Thank you. That helped a lot.
*October 31, 2014*

**chemistry**

A balloon contains 0.126mol of gas and has a volume of 2.78L. If an additional 7.0×10−2mol of gas is added to the balloon, what will its final volume be?
*October 31, 2014*

**chemistry**

Calculate the concentrations of all species in a 1.22 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10–2 M and Ka2 = 6.3× 10–8 M.
*October 30, 2014*

**Math**

How did the Proclamation of 1763 attempt to protect the Native American rights and land?
*October 28, 2014*

**Math**

The slowest mammal on Earth is the sloth. A sloth might move along a tree at a maximum rate of just 3 ^-1m each minute. At this rate, how long will it take a sloth to climb a tree that is 33 m tall?
*October 27, 2014*

**college algebra**

C(x)=.80+.33x
*October 27, 2014*

**Mr. Anonymous**

Max = (-5/3,0) Min = (0,0)
*October 24, 2014*

**Chemistry**

How many moles of ammonia are in 1.20E25 molecules of ammonia.
*October 23, 2014*

**French**

You can say "On dit X" (One could say X) or "Le mot est X" (The word is X)
*October 23, 2014*

**Math**

Write each expression using a single exponent. Xy^5 • x^3 y^7
*October 22, 2014*

**Physics**

The blades of a ceiling fan have a radius of 0.393 m and are rotating about a fixed axis with an angular velocity of +1.36 rad/s. When the switch on the fan is turned to a higher speed, the blades acquire an angular acceleration of 1.82 rad/s2. After 0.475 s have elapsed since...
*October 18, 2014*

**Physics**

A top is a toy that is made to spin on its pointed end by pulling on a string wrapped around the body of the top. The string has a length of 54 cm and is wound around the top at a spot where its radius is 2.2 cm. The thickness of the string is negligible. The top is initially ...
*October 18, 2014*

**Chemistry**

or rather were questions
*October 18, 2014*

**Chemistry**

1)What could have caused the impurity in the sodium hydroxide solution? 2)Why was it necessary to dilute the hydrochloric acid before carrying out the titration? This was a question from a titration practical in which we had to dilute HCL then use that along with 25cm3 of NaOH...
*October 18, 2014*

**Physics**

A floor polisher has a rotating disk that has an 11-cm radius. The disk rotates at a constant angular velocity of 1.1 rev/s and is covered with a soft material that does the polishing. An operator holds the polisher in one place for 43 s, in order to buff an especially scuffed...
*October 15, 2014*

**Math**

(-3) ^-4 5 ^-2 =?
*October 15, 2014*

**Math**

How to solve 2^-1/5^2 ?
*October 14, 2014*

**Math**

3^-2/n and 7ab^-2/3w .
*October 13, 2014*

**chemistry**

A 300mL solution was made by dissolving 5.0g of MgCl2 in water. What is its molarity?
*October 11, 2014*

**Algebra**

A person has 29 1/2 yards of material available to make doll outfits. Each outfit requires 3/4 yard of material. a: How many outfits can be made? b: How much material will be left over?
*October 11, 2014*

**Math**

Melanie has 84 muffins, which he needs to box up, 9 of which are blueberry, into dozens. How many boxes does she need?
*October 6, 2014*

**Math**

Tim has forty five books. Jason has forty two times more books than Tim. How many books does Jason have?
*October 6, 2014*

**SS**

New France is _____ of the Appalachian Mountains.
*October 5, 2014*

**statistics**

A poll asked 500 adults if they thought Ontario should produce more, less or maintain current production of ethanol. -160 people responded "more ethanol production" -136 people responded "less ethanol production" -155 people responded "maintain current...
*October 5, 2014*

**Physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is eighty-two times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites.
*October 3, 2014*

**Physics**

A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 18.0 m. She pushes in a direction 20.0° below the horizontal. A 40.0-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? (b) ...
*October 3, 2014*

**Physics**

But how do you go about finding time since it is not given and you are only given a magnitude of the force and not the velocity
*October 3, 2014*

**Physics**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*October 3, 2014*

**Physics**

Suppose in the figure blow that +1.00 103 J of work is done by the force F with arrow (magnitude = 30.0 N) in moving the suitcase a distance of 51.0 m. At what angle θ, counterclockwise from the x-axis, is the force oriented with respect to the ground?
*October 3, 2014*

**Social Studies (SS)**

Sorry I accidentally put math but can you please Describe George Washington's expeditions into French territory.
*October 2, 2014*

**english**

nvm got it!
*October 1, 2014*

**english**

help on thesis writing
*October 1, 2014*

**Math**

Hi, I have two questions here I need help with, thank you in advance. 1. Peggy scored 68 on her first three tests of the term. What would she have to score on the fourth test to have an average of 70 on the fourth test? 2. If you were to place the digits 1,2,4,8,9, one per box...
*October 1, 2014*

**Math help!**

Thanks:)
*October 1, 2014*

**Math help!**

Identify the property of integers being illustrated in each of the following: a:(-2)(3) (the "E" letter) element of I b: (-4)0=0 c: -2(3+4)=-2(3) + (-2)4 d: (-2)3=3(-2)
*October 1, 2014*

**Math help!**

Identify the property of integers being illustrated in each of the following: a:(-2)(3) ¸ I b: (-4)0=0 c: -2(3+4)=-2(3) + (-2)4 d: (-2)3=3(-2)
*October 1, 2014*

**math**

If x is an integer and x is not equal to zero, which of the following are always positive and which are always negative? a: -x to the power of 4 b: (-x) power of 4 c: x to the power of 4 d: x e: -x
*October 1, 2014*

**AP Calc B/C**

the integration of (e^x)/(1-E^2x)^3/2 with respect to x We are currently doing integration by tables, but I can't find the formula that I should use!
*September 29, 2014*

**Physics**

A stone is tied to a string (length = 0.700 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...
*September 25, 2014*

**Physics**

A car is safely negotiating an unbanked circular turn at a speed of 18 m/s. The road is dry, and the maximum static frictional force acts on the tires. Suddenly a long wet patch in the road decreases the maximum static frictional force to one-ninth of its dry-road value. If ...
*September 25, 2014*

**Physics**

As you hurry to catch your flight at the local airport, you encounter a moving walkway that is 85 m long and has a speed of 2.2 m/s relative to the ground. If it takes you 68 s to cover 85 m when walking on the ground, how long will it take you to cover the same distance on ...
*September 23, 2014*

**chemistry**

A website promoting the use of alternative energy vehicles and hybrid technologies claims that, \"A typical automobile in the USA uses about 40 gallons of gasoline every month, producing about 750 lbs of carbon dioxide.\" To determine the truth of this statement, ...
*September 18, 2014*

**chemistry**

using your initial mass of copper, calculate the minimum volume of concentrated 12M nitric acid needed to completely react with your copper to form copper(II) nitrate? Original mass of copper was 0.40g.
*September 18, 2014*

**Math**

Calculate the dot product Ā·Ê(where Ê = Ē/E ~ is the unit vector in the direction of Ē ) and plot both Ā and Ê, showing how Ā·Ê is the projection of Ā on Ê. Ā= −4ˆi + 3ˆj Ē= 12...
*September 18, 2014*

**chemistry**

A 15.27 g sample of Mo2O3(s) is converted completely to another molybdenum oxide by adding oxygen. The new oxide has a mass of 18.33 g. Add subscripts below to correctly identify the empirical formula of the new oxide.
*September 18, 2014*

**AP Calc B/C**

Find the arc length of one arch of the sine curve. I started it by doing y=sinx, y'=cosx arc length= integral of sqrt(1+cos^2x)dx from pi/2 to 3pi/2 but I don't know how to integrate that! Thank you!
*September 13, 2014*

**Accounting - General**

Should a capital asset that is increasing in value be depreciated?
*September 4, 2014*

**Physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials' boat pulls up next to the spy's boat, both reach the edge of a 7.8 m waterfall. If the spy's speed is 11 m/s and the officials' speed is 22 m/s...
*September 2, 2014*

**Social Studies**

In return for offering the throne to William and Mary, it was demanded that all laws had to be approved by? A: Parliament B: King James C: The Catholic Church D: The Protestant Church My answer is A. Can someone please check if this is right?
*August 28, 2014*

**English**

I'm writing an essay. Is this semi-colon used appropriately or should it be a new sentence? At the age of six, India seemed like a completely different world to me; they had a different way of life than anything I had ever been exposed to.
*August 25, 2014*

**geography**

why is the world round, but look flat???????
*August 25, 2014*

**fitness**

They send text books for this class! I'm in the class myself, but having trouble. These are not easy classes. You have to study!
*August 16, 2014*

**AP Calc**

When a chain hangs under its own weight, its shape is catenary. The equation of a catenary with a vertex on the y-axis is y=e^x+e^-x. Find the length of the chain from x=-2 to x=2. Then use the same technique from Problem #8(Previous AP calc problem I posted) to find the ...
*July 31, 2014*

**AP Calc**

The picture to the right shows the Ben Franklin Bridge which stretches across the Delaware River joining Pennsylvania and New Jersey. The center span of the bridge is about 4200 feet long. The suspension cables hang in parabolic arcs from towers 750 feet above the surface of ...
*July 31, 2014*

**calc**

q 0 125 250 375 500 625 750 C'(q) 27 35 41 45 43 46 51 Give fixed cost = 8800 and cost of producing 250 units is 17425, how much would the total cost increase if production were increased one unit, to 251 units? --- A cup of coffee at 90 degrees celsius is put into a 30 ...
*July 21, 2014*

**math**

add 12 to both sides of the equation, and you get this: q-12+12=89+12 q=101
*July 17, 2014*

**HVAC/R**

So what they are saying is that if the ANSI standard happens to be adopted by OSHA, THEN it has the "force of law". Is that what you are reading/interpreting? And that would mean that both are correct...
*July 17, 2014*

**HVAC/R**

I know Technician B is correct, but is Technician A also correct? Is there any "force of law" carried with these standards?
*July 17, 2014*

**HVAC/R**

Oops sorry - it's either Technician A or Technician B, or Neither or Both. Who is correct? Both of them? Or Neither? Or A or B?
*July 17, 2014*

**HVAC/R**

Two technicians are discussing the HVAC/R field. Technician A says that industry codes that require certain types of installation practices carry the force of law with them. Technician B says that ANSI is an organization that establishes codes for the HVAC/R field. Which one ...
*July 17, 2014*

**statistics**

Lebron
*July 12, 2014*

**math**

Let ABCD be a cyclic quadrilateral. Let P be the intersection of \overline{AD} and \overline{BC}, and let Q be the intersection of \overline{AB} and \overline{CD}. Prove that the angle bisectors of \angle DPC and \angle AQD are perpendicular.
*July 2, 2014*

**spelling**

Hi, learning math facts and equations can definitely be difficult. Atleast I know it was for me! A great way to practice and increase the abilities of your memory are using flash-cards or playing a couple rounds of the game memory.
*July 1, 2014*

**Physics**

What is the total pressure, in atmospheres, of a 10.0 L container that contains 10 moles of nitrogen gas and 10 moles of oxygen gas at 300 K? I tried using PV=nRT and added both P together but kept getting the wrong answer. n=10, T=300 K, V=1x10^-3 m^3
*June 26, 2014*

**Geometry**

Two altitudes of a triangle have lengths 12 and 14. What is the longest possible length of the third altitude, if it is a positive integer?
*June 23, 2014*

**english**

a. alliteration
*June 12, 2014*

**Chemistry**

Check my answer please? A reaction requires 22.4 L of gas at STP. You have 45.0 L of gas at 100 kPa and 373 K. Which of the following statements is true? The gas constant is 8.31 L-kPa/mol-K. You will have an excess of gas and the reaction will occur. <--------- You will ...
*June 3, 2014*

**math algebra?**

Is 1/3 , 3/4 , 0.2 in order from least to greatest or is 5 1/8 , 5 1/4 , 5 2/3 in order from least to greatest?
*June 2, 2014*

**Science**

no one goes on this site lol.
*May 28, 2014*

**physics**

Second hand = 1 rpm: 1/60 rps; i.e. 1/60 cycle/s; i.e. 1/60 Hz
*May 26, 2014*

**Physics**

Did you ask this on YA!, cuz somebody answered it 50 minutes ago just google your question and it'll come up
*May 26, 2014*

**Geometry**

mh = 40 m = (8+10)/2 = 9 9h=40 h = 40/9
*May 25, 2014*