Monday

April 20, 2015

April 20, 2015

Total # Posts: 1,032

**Math**

A boat moves 7 kilometers upstream in the same amount of time it moves 17 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water.
*May 4, 2011*

**social studies **

Why do people need government?
*May 2, 2011*

**Science**

Where can I find AP Environmental Science old AP exams? I need to study.
*April 29, 2011*

**chemistry**

210 210 Pb --> Bi + ? 82 83 60 0 Co --> ? + e 27 -1 I need an explanation on how to find the missing product.
*April 6, 2011*

**calculus**

@Damon : Appreciate it sir. u are a life saver. i was on track and needed a kick . thanks alot.
*April 2, 2011*

**calculus**

1. Consider a projectile, say a frictionless teddy bear, which is thrown at an angle of theta with an initial velocity of v0. a) For a fi xed angle, and the maximum height of the teddy bear. b) Calculate the distance that the teddy bear travels before ...
*April 2, 2011*

**calculus**

6. A parabaloid with height h and radius r has volume 1/2 pieR^2H. Consider a parabaloid-shaped water tank with height of 7m and radius of 4m. If V is the volme of water in the tank and h is the depth of water, find the relationship between dV/dt and dhdt. How is the ...
*April 2, 2011*

**math/physics**

@ reiny if dx/dt = 0 then y should also be zero
*April 1, 2011*

**math/physics**

if dx/dt = 0 then y should also be zero
*April 1, 2011*

**math/physics**

5. Consider a particle moving counter-clockwise around the ellipse x^9/9 +y^2/4 = 1. Find a relationship between dy/dt and dx/dt What are the rates of change of y and x at the times when the other variable isn't . changing at all?
*April 1, 2011*

**munir**

its bit of maths and physics. ms .sue. use of function
*April 1, 2011*

**biology**

A man with normal color vision marries a woman who is colorblind. What percentage of their sons would be colorblind, what percentage of their daughters would be colorblind, what percentage of their daughters would be carriers of the colorblind gene?
*March 31, 2011*

**physics**

I'm trying to find the pressure exerted by an object that has a force of 180 newtons on an area of 10 square centimeters
*March 31, 2011*

** US History**

Question 1 (Multiple Choice Worth 1 points) Around the turn of the century, African Americans moving to cities in the North experienced substantially less racism than did African Americans in the South. more opportunities to become skilled workers than they had two decades ...
*March 23, 2011*

**programming 2**

Write a program that inputs a word representing a binary number (0s and 1s). First, your program should verify that it is indeed a binary number, that is, the number contains only 0s and 1s. if that is not the case, your program should print a message that the number is not a ...
*March 22, 2011*

**calculus**

Complete the identity. sec(x)sin(x)/tan(x) - 1 = 0
*March 20, 2011*

**Math**

What is the formula for the area of a triangle and trapezoid?
*March 17, 2011*

**math**

What are the first and third quartiles of the box and whisker plot above? 0 15 110 225
*March 13, 2011*

**Statistics**

What type of data must you collect to conduct a t-test, why?
*March 11, 2011*

**Statistics**

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal. d. The graph of a ...
*March 11, 2011*

**English 2**

Republicans favor business. Teenagers are seeking their own identities. Top students work hard. But I don't like where I can go with any of them, and I can't think of anything more!
*March 11, 2011*

**English 2**

Need help with this-- "In this exercise you'll write an essay supporting a generalization you've stated about some topic." Any ideas for generalizations?
*March 11, 2011*

**english**

All I see is that you need a comma after "your agent."
*February 24, 2011*

**Math**

Thanks
*February 24, 2011*

**social studies**

Mercenary
*February 24, 2011*

**Algebra**

The $75 cost for a party was to be shared equally by all of those attending. Since five more people attended than was expected, the price per person dropped by 50 cents. How many people attended the party?
*February 21, 2011*

**pre-algebra**

the length of a rectangle is 10 inches more than its width. what are the dimensions of the rectangle if its perimeter is 80 inches?
*February 11, 2011*

**Chemistry 125**

What is the maximum mass of water that can be released by heating a 6.895 g sample of nickel(II) sulfate heptahydrate?
*February 10, 2011*

**Physics**

1) Charges of +4uC and -6uC are placed at two corners of an equilateral triangle with sides of 0.10m. At the third corner, what is the electric field magnitude created by these two charges? A]4.5 x 10e6 N/C B]3.1 x 10e6 N/C C]1.6 x 10e6 D]4.8 x 10e6 2)A +2.0 nC pont ahrge ...
*February 3, 2011*

**math**

All 26 letters of the alphabet are written on cards and shuffled. If one card is pulled out randomly, find the probability. (note Y is not considered a vowel for these problems) P(A or Z) =
*February 2, 2011*

**algebra II**

factor completely: 8h^3-125
*January 29, 2011*

**AP Chem**

For the system CO(g) + H2O(g)<-->CO2(g) + H2(g) Kp is 1.6 at 900 K. If 0.400 atm CO(g) and 0.400 atm H2O(g) are combined in a sealed flask, what is the equilibrium partial pressure of CO2(g)?
*January 23, 2011*

**Physics**

1. Could a horizontal axis of rotation be used satisfactorily in an experiment uniform circular motion? Explain
*January 16, 2011*

**Physics**

508.4 N [2(2.0m)/6.2m]x788.0N
*January 16, 2011*

**Chemistry**

Chemical equation of: 1.Digesting of food 2.Fermentation of Wine 3.Burning of fuel
*January 13, 2011*

**Algebra**

This question is unsolvable.
*January 12, 2011*

**Math need help now!!!!!**

We perform the experiment "deal a five card poker hand". What is the probability that you are dealt a hand that contains the Ace, Two, Three, and Four of Diamonds? Question 22 answers 4 / 2,598,960 48 / 2,598,960 1 / 2,598,960 1 / 52
*January 12, 2011*

**Chemistry**

How to find the marked volume in graduated cylinder?
*January 9, 2011*

**Chemistry**

when the beaker has rated capacity of 10 ml, does it mean that it has to be filled to the brim?
*January 9, 2011*

**Math**

If you toss a pair of dice 1,000 times, how many times would you expect to get a sum of 12 as the result? 1.)about 12 times 2.)about 27 times 3.)about 36 times 4.)about 100 times The lesson doesn't show me how to work this. Whats the formula?
*January 7, 2011*

**American Government**

Which of the following is NOT a key role of the President? to decide if laws are unconstitutional perform many ceremonial duties command all military offices during both peace time and during war responsible for executing the nation's laws I Think it's 3 or 4 not sure ...
*January 5, 2011*

**American Government**

Thanks!
*January 5, 2011*

**American Government**

Committees made up of members from both the House of Representatives and the Senate are called Question 18 answers 1.)standing committees. 2.)select committees. 3.)subcommittees. 4.)joint committees. I think it's either 2 or 4 not sure please help!
*January 5, 2011*

**Math 157**

no the girls can be arranged 9 different ways and the boys can be arranged 49 different ways
*January 5, 2011*

**Math**

2x - y = 4 6x - 3y = 7 (a) y = 2x - 4 (b)No solution (c)x = 2, y = -4 (d)x = 2, y = 5/3
*January 3, 2011*

**Math**

Solve each of these systems using the substitution method. Make sure to check your answers ! 2x + 3y = -4 x - 2y = 5 Question 1 answers x = 1, y = -2 x = -1, y = 2 x = 1, y = 2 x = -2, y = -1
*January 3, 2011*

**science**

what are 3 examples of selective breeding in plants
*December 21, 2010*

**Math**

m+8+2+n
*December 20, 2010*

**Math**

Simplify each expression. You may use the properties to help. When you type your answer, do not space between numbers and symbols. (4a)(5b)(6c)?
*December 16, 2010*

**3rd grade math II**

HOW CAN EXPLAIN WHY 975-492 = 583 IS REASONABLE ?
*December 14, 2010*

**Physics**

a person fires a rifle at a arget. the bullet leaces the rifle at 460 m/s and the person hears the bullet strike the target 2.00 seconds after firing it. the air temperature is 25.o celcius. what is the distance to the target?
*December 12, 2010*

**Physics**

a person fires a rifle at a arget. the bullet leaces the rifle at 460 m/s and the person hears the bullet strike the target 2.00 seconds after firing it. the air temperature is 25.o celcius. what is the distance to the target?
*December 12, 2010*

**physics**

what equation would you use if you wanted to find the net x-direction force on the box example: here is the problem... A box of mass 24.0 kg is subject to an applied force of 245 N with a depression angle of 31.2°, and it accelerates to the right. The horizontal surface ...
*December 5, 2010*

**Pjysics Help!!!**

An organ pipe is open at one end and has a length of 3 m. What is its fundamental frequency if the speed of sound is 336 m/s?
*December 1, 2010*

**Math**

Use the Gauss-Jordan method to solve the equation: 3x-5y-2z=-9 -4x+3y+z=11 8x-5y+4z=6
*November 24, 2010*

**Science**

sugar is a covalent compound
*November 16, 2010*

**math**

would the long side be 36 in?
*November 16, 2010*

**math**

Herman is making a small triangular table. If two of the sides will measure about 25 inches each, how many inches should the longest side (c) measure? Use the appropriate formula and round your answer to the nearest tenth. I don't know how to do this cuz it doesn't ...
*November 16, 2010*

**Economics**

Hi guys, I'm having a lot of trouble with this question. Maybe I should have paid attention more, too late now though. If anyone could help or point me out in the right direction, I'd really appreciate it! Thank you. Here is what the paper says "Your assignment is...
*November 15, 2010*

**AP Chemistry**

What is the equation for the standard enthalpy of formation for magnesium nitrate?
*November 14, 2010*

**Physics **

The answer is wrong. What did u get?
*November 13, 2010*

**Physics **

A 2.30 102 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 21.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 7.00 m. (a) Find the work done by the pulling ...
*November 13, 2010*

**chemistry**

which of the following would form acidic,basic or neutral solutions:nh4f,nh4cn,nh4ch3coo,nh4cl,ba(ch3coo)2,nacn,caso4,cr(no3)3,fecl3,na2co3
*November 11, 2010*

**Physics**

2. A person exerts a perpendicular force of 75 N on a door. Calculate the torque on the door hinges if the force is applied a distance of 30 cm, 50 cm, and 75 cm from the hinge.
*November 4, 2010*

**American Government**

Haha never thought of it that way! Thanks!
*November 4, 2010*

**American Government**

Is this statement true: The Secretary of Defense could never become President.
*November 4, 2010*

**Integrated math**

A meteorologist tracked the increase and decrease of rain totals in inches from the previous year. This is the data for the following 4 months: January -1.34, February +2.68, March + 1.79, April -0.87. Estimate the change from the previous year by adding the totals rounded to...
*November 3, 2010*

**CHEM. help please**

2 H2O (l) → 2 H2 (g) + O2 (g) 1. Without doing any calculations, which side will enthalpy favor in this reaction? Entropy? 2. What volume of water in gallons would need to be split to store the same amount of energy as found in 10.0 gallons of gasoline? (Gasoline ...
*November 2, 2010*

**chem**

In a vehicle, H2 could be used in a fuel cell to generate energy. Hydrogen is not an energy source, but a means of transporting energy because the extraction of H2 from the logical source, H2O, takes as much energy as is returned when the gas is used. 2 H2O (l) → 2 H2 (g...
*November 2, 2010*

**physics**

an object is initially moving 15.0 m/s. a minute later, it is moving 25.0 m/s in the opposite direction. What is the displacement and acceleration?
*October 31, 2010*

**math**

Yes for example a triangle with sides of length 3, 4, and 5 inches.
*October 31, 2010*

**Math Help Please**

x=4.4
*October 28, 2010*

**chem 101**

using the unit conversion method derive an equation to calculate heat produced from the HCl-Na OH reaction
*October 26, 2010*

**6th grade**

What are the two similar features for long shore current and rip currents?
*October 26, 2010*

**chem 101**

how many grams of oxalic acid dihydrate to completely neutralize 25ml of 0.12 M of sodium hydroxide
*October 18, 2010*

**physics**

the string off of A
*October 8, 2010*

**physics**

no its on a flat surface with the static friction of .25. and W is hanging off the string at a 45 degree angle vertically.
*October 8, 2010*

**physics**

(a)block A weigh 60N. the coefficient of static friction between the block and the surface on which it rests is 0.25. the weight W is 12N and the system is at equilibrium. find the friction force exerted on block A. (b)find the maximum weight W for which the system will remain...
*October 8, 2010*

**us history**

Since the Constitution has been ratified, how many states have been admitted to the union?
*October 8, 2010*

**physics**

An elevator and its load have a combined mass of 1700 kg. Find the tension in the supporting cable when the elevator, originally moving downward at 13 m/s, is brought to rest with constant acceleration in a distance of 43 m.
*October 7, 2010*

**physics**

i have plugged in all the numbers and got .51 what do i do at this point???
*October 5, 2010*

**physics**

A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 26 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 135 m), the block swings toward the outside of the ...
*October 5, 2010*

**PHYSICS**

thanks for the detailed explanation
*October 5, 2010*

**chemistry**

HBr is a molecular substance that is a strong acid in water. Write an equation for its ionization in water. Use minimal integer numbers to balance the reaction. Include physical states in your answer, e.g., start with HBr(l).
*October 4, 2010*

**Chemistry**

0.01L KHP * 0.445M KHP = 0.00445 molKHP KHP and NaOH are in 1 to 1 ratio so, moles NaOH = 0.00445 so, 0.00445mol NaOH/ 0.01154L NaOH = 0.386M NaOH
*October 4, 2010*

**Physics**

Ok thanks.
*October 4, 2010*

**Physics**

A bicycle wheel that initially spins at 3 revolutions per second is braked uniformly to a stop in 1 second. A spot is painted at the outer edge of the wheel. How many revolutions does the spot go during the time it takes the wheel to stop? The answer I got was 0.5 but was ...
*October 4, 2010*

**math**

What is the naming convention for a vector when two arrow point outward from a central point?
*September 21, 2010*

**PHYSICS**

F=Ma M =79kg a= 9.8ms^-2 (gravity) There is no other acceleration component since the aeroplane is at constant velocity so Force on pilot is... 79 x 9.8 = 774.2 N
*September 21, 2010*

**Algebra**

Sorry didn't see your second answer, great thanks a lot.
*September 17, 2010*

**Algebra**

I understand, your answer never mind. Thanks :)
*September 17, 2010*

**Algebra**

sorry don't understand
*September 17, 2010*

**Algebra**

100^0 one hundred to the zero power, would it be zero or one hundred?
*September 17, 2010*

**math**

32.5 - 45.8 please show steps!
*September 17, 2010*

**math**

x/7+5=10
*September 17, 2010*

**physics**

The left ventricle of the heart accelerates blood from rest to a velocity of +26 cm/s. (a) If the displacement of the blood during the acceleration is +1.9 cm, determine its acceleration (in cm/s2). (b) How much time does it take for the blood to reach its final velocity?
*September 9, 2010*

**physics**

The left ventricle of the heart accelerates blood from rest to a velocity of +23 cm/s. (a) If the displacement of the blood during the acceleration is +2.1 cm, determine its acceleration (in cm/s2). (b) How much time does blood take to reach its final velocity? in seconds
*September 7, 2010*

**physics**

A jetliner, traveling northward, is landing with a speed of 65 m/s. Once the jet touches down, it has 785 m of runway in which to reduce its speed to 5.0 m/s. Compute the average acceleration (magnitude and direction) of the plane during landing (take the positive direction to...
*September 7, 2010*

**algebra**

look at the algebraic equation that u posted previously. try to form an equation similar to that.
*September 5, 2010*