Friday
October 24, 2014

Posts by anon


Total # Posts: 1,387

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

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

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

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

intro to computers
You are shopping for a new computer. You see the memory listing as 1GBX4. What does this mean? A. 4 DDR first generation DIMMs B. 1 GB of memory made up of 4 DIMMs C. 4 GB of memory made up of 4 DIMMs D. 1 DDR fourth generation DIMMS ????
May 24, 2014

intro to computers
1.You want to purchase a new hard drive for your workstation and are deciding between an HDD and SDD drive. Which of the selections below is NOT an advantage that SDD has over HDD? A. They don’t get fragmented. B. They create less noise. C. They create less heat. D. They ...
May 24, 2014

computers
Which type of USB connector is always plugged into the computer to connect an external device? a. type A B. type B c. Micro d. Mini
May 24, 2014

Calc
A patient receives a 3 ml dose of medicine. The amount, y, of medicine in the body decreases at a rate of 15% per hour (dy/dt=-.15y). When the medicine in the patient is down to 1 ml, the nurse administers a second 3 ml dose and plans to give the patient a third dose when the ...
May 11, 2014

Calculus
For the parabola y^2=4px, where p, the focal length, is a constant, the focal point, f(p,0), is on the x-axis. Point S is 10 units from the point F and the segment SF makes a 60degree angle with the x-axis. The slope of segment TF is twice the negative of the slope of the ...
May 11, 2014

chemistry
The oxygen from the air could cause the hydrogen to ignite.
May 9, 2014

math
ms. sue that is a link to a different question
May 7, 2014

CALCULUS
The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ...
April 29, 2014

CALCULUS HELP PLZ
The region R is bounded by the x-axis, y-axis, x = 3 and y = 1/(sqrt(x+1)) A. Find the area of region R. B. Find the volume of the solid formed when the region R is revolved about the x-axis. C. The solid formed in part B is divided into two solids of equal volume by a plane ...
April 29, 2014

statistics
Some students were asked, "Would you date someone with a great personality even though you did not find that person to be attractive?" Of the 131 women surveyed, 61.1% said yes, and of the 61 men surveyed, 42.6% said yes. Is there sufficient evidence to conclude that...
April 26, 2014

statistics
A researcher believe that college students spend a different amount of time talking on the phone than they do instant messaging. She takes a random sample of 12 college students and records the number of hours per week each student spends on each activity and plans to test at ...
April 26, 2014

Maths
Cheater! I am doing the maths challenge too and this isn't fair to the other students.
April 26, 2014

math, calculus
1. Consider the region bounded by the curves y=|x^2+x-12|, x=-5, and x=5 and the x-axis. A. Set up a sum of integrals, not containing an absolute value symbol, that can be used to find the area of this region. B. Find the area of the region by using your answer from part A. ...
April 23, 2014

Math
We are learning about proofs. We drew lines between noncollinear points. Our table showed 2 points >> 1 line segment, 3 point >> 3 line segments, 4 points >> 6 line segments, 5 points >> 10 line seg, 6 points >> 15 line seg. etc. Write an ...
April 12, 2014

Physics (Rotation)
In the figure, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt ...
April 12, 2014

Science/Biology
Please check my answers: 1. Which of the following correctly states the relationship between monkeys and humans? A. Humans and monkeys evolved from apes. B. Humans evolved from monkeys. C. Humans and monkeys evolved from the same ancestor, which is now extinct. D. Humans ...
April 4, 2014

English
List as many details as you can for each of the topic sentences. 1. Walking briskly for a mile after a day sitting at a desk helps dispel fatigue. Purpose: To explain 2.Bird watching in the woods is relaxing as well as educational Purpose: To convince
April 3, 2014

Science
anyone at all?
April 3, 2014

Science
please help me
April 3, 2014

Science
fill in the blank questions monotremes, marsupials, and placentals have the same _____ known as the therapsid. a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not ...
April 3, 2014

calculus and vectors
Determine an equation of the line of intersection of the planes 4x − 3y − z = 1 and 2x + 4y + z = 5.
April 1, 2014

Math
Use the following four coordinates to determine which one has a distance of 10 units from point C (1, 2). (3, 4) (7, 1O) (6, 7) (8, 9)
March 26, 2014

Economics HELP PLEASE!!!!
Yes how about this one? Suppose that firms are NOT owned by consumers. Let s denote the size of the per-unit subsidy/tax given to the firms. Let positive values of s denote subsidies, and negative values of s denote taxes. QUESTION: What is the value of s that maximizes total ...
March 21, 2014

AP Calc
The base of a solid is bounded by y=|x|+a, <a<, and the line y=3. Find, in Cu. units in terms of a, the volume of the solid if every cross section perpendicular to the y-axis is an equilateral triangle.
March 18, 2014

AP Calc
If x=e^t and y=t^2-3, then for what values of t, t>=0, is the function y=f(x) concave up?
March 17, 2014

AP Calc
The coordinates of the point on the curve cos(y)=x-y, -pi<=x<=pi, where the tangent line to the curve is a vertical line is ____.
March 17, 2014

AP Calc
The base of a solid is the region in the first quadrant bounded by the ellipse x^2/a^2 + y^2/b^2 = 1. Each cross-section perpendicular to the x-axis is an isosceles right triangle with the hypotenuse as the base. Find the volume of the solid in terms of a and b. I'm having...
March 17, 2014

AP Calculus
Approximating the integral from 0 to 6 of (e^x dx) by 3 circumscribed rectangles of equal width on the x-axis yields ____. a) 2e^2 + 4e^4 + 6e^6 b) 2(e^2 + e^4 + e^6) c) 2(e + e^3 + e^5) d) e + 3e^3 + 5e^5 e) e^2 + 3e^4 + 5e^6
March 17, 2014

AP Calculus
The average area of all squares with sides between a inches and b inches (b>a) is ____ in^2.
March 16, 2014

AP Calculus
The base of a solid is bounded by y =|x|+a, 0<a<3, and the line y=3. find in cu. units in terms of a, the volume of the solid if every cross section perpendicular to the y-axis is an equilateral triangle.
March 16, 2014

CALCULUS ECONOMICS
??
March 13, 2014

science
An atom of sodium-23 (atomic number = 11) has a positive charge of +1. Given this information, how many electrons does it have? How many protons and neutrons does this atom have?
March 9, 2014

science
A hydrogen atom has one proton, two neutrons, and no electrons. Is this atom an ion?
March 9, 2014

Probability
Anyone know answer to 2?
March 7, 2014

Geometry
In baseball, the length of the path between each pair of consecutive bases is 90 feet. The paths form right angles. How far does the ball need to travel if it is thrown from home plate directly to second base? A. 90 feet B. 127.3 feet C. 135.7 feet D. 180 feet
March 6, 2014

MATH
I agree with tbetzz
March 5, 2014

MATH
But why would you subtract the 576 and 144. and plus to find the circumference you were supposed to times the 576 by pi and the 144 by pi
March 5, 2014

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