Friday

March 6, 2015

March 6, 2015

Total # Posts: 1,735

**physics**

A 66.5 kg ice skater moving to the right with a velocity of 2.09 m/s throws a 0.14 kg snowball to the right with a velocity of 22.5 m/s relative to the ground. (a) What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and...
*November 3, 2013*

**Algebra 1**

Can someone help me I really don't get this one The table shows the number of trolley buses in operation in the United States during certain years. Describe the rates of change in the number of buses during the time period. (Table) Year 1980 1985 1990 1995 2000 Number 823 ...
*October 31, 2013*

**chemistry **

A microwave oven heats by radiating food with microwave radiation, which is absorbed by the food and converted to heat. Suppose an oven's radiation wavelength is 12.5 cm. A container with 200 mL of water was placed in the oven and heated. How many photons are required to ...
*October 23, 2013*

**Algebra 1**

y=x+1 Domain: -2,-1,0,1,2 what is the range? Is it -1,0,1,2,3
*October 23, 2013*

**chemistry**

if 5.2 grams of bismuth react under certain conditions with 10.0 g of oxygen what is the empirical formula of the bismuth formed
*October 22, 2013*

**Geography**

I have to write a three paragraph essay on the causes of terrorism. One paragraph for each cause. All I am helping is finding 3 good causes and a little information about how they cause terrorism.
*October 20, 2013*

**chemistry**

why is the copper/sulfur mass ratio different from the mole ratio?
*October 19, 2013*

**Physics**

How do you find total displacement to and from a place?
*October 17, 2013*

**Newtons Second Law Physics**

If a cart and a string are attached and there is a weight on the end of the string to pull the cart, and both the cart and the weight on the string were the same.. what would I expect acceleration to be using Newton's second law?
*October 16, 2013*

**Physics Newtons Law**

If a cart and a string are attached and there is a weight on the end of the string to pull the cart, and both the cart and the weight on the string were the same.. what would I expect acceleration to be using Newton's second law?
*October 15, 2013*

**MATH**

Which of the following is an irrational number? a. negative square root of 5 B. 1/8 c. 0.3858585... d. negative square root of 64
*October 15, 2013*

**Chemistry**

Assuming the gas is ideal, we use the formula ρ = P*MM / RT where ρ = density (g/L) P = pressure (atm) MM = molar mass (g/mol) R = gas constant = 0.0821 L-atm/mol-K T = temperature (K) Note that this formula is just derived from the ideal gas law (PV = nRT). Convert ...
*October 15, 2013*

**vocab**

I need help on rootwords im stuck on sepect meaning look I have to find 3 words with sepect in it then put the meaning
*October 14, 2013*

**chem**

The reaction is Br2 (g) <---> 2Br (g). It occurs at T = 1600 C. When 1.05 mol Br2 are placed in a 2 Liter flask, 2.50% of Br2 undergoes dissociation. Calculate the Kp for the reaction. Okay so i did the ICE table for this, Br2 (g) <---> 2Br (g) I : 1.05/2 ..... 0 C...
*October 14, 2013*

**Algebra 1**

A cyclist can travel 29.6 miles in 2 hours. At this rate, how far can the same cyclist travel in 45 minutes? A: 14.8 B: 22.2 C: 11.1 D: 16.2
*October 10, 2013*

**Algebra 1**

A cyclist can travel 29.6 miles in 2 hours. At this rate how many gallons will it need to travel 650 miles. A: 14.8 B: 22.2 C: 11.1 D: 16.2
*October 10, 2013*

**algebra 1**

4-10y=22-6x Solve the Equation for y
*October 7, 2013*

**Algebra 1**

An architectural firm makes a model of a science center they are building. The ratio of the model to the actual size is 1 in.:85 ft. Estimate the height of the building if the model is 1.5 inches tall.
*October 5, 2013*

** Algebra 1**

You are making up your own mix of concrete to patch a set of stairs. In order to have the proper mix, you need to mix 1 part of Portland cement with 2 parts of sand and 3 parts of gravel. A. How many total parts are in one batch of concrete? B. You make a mix with 4 parts of ...
*October 5, 2013*

**Algebra 1**

23=2x+(x+3)+x I know the answer is 5 but I don't know how to show the work.
*October 1, 2013*

**Algebra 1**

what is the value of x in the rectangle Perimeter=24 meters the side is (x+3) The bottom is 2x
*October 1, 2013*

**Math**

ben deposits $320 in an account that earns 3.5% simple interest per year. what is the balance in the account year?
*September 19, 2013*

**Math- Help Please**

Find a polynominal of degree 4 that has integer coefficients and zeros 4,-4,5 and 1/2.
*September 16, 2013*

**Math**

V(t)=175(1-(t/45))^2 Find the inverse V^-1=?
*September 12, 2013*

**language arts**

why is rikki tikki tavi not afraid to fight a cobra snake
*September 11, 2013*

**Chemistry**

325
*September 11, 2013*

**physics**

You are arguing over a cell phone while trailing an unmarked police car by 25.0 m; both your car and the police car are traveling at 120 km/h. Your argument diverts your attention from the police car for 2.0 s (long enough for you to look at the phone and yell,“I won'...
*September 5, 2013*

**physics**

if a ball is tossed from ground level upward at a speed of 44 m/s how long will it take to reach its maximum height
*September 4, 2013*

**physics**

An automobile tire has a radius of 0.335 m, and its center moves forward with a linear speed of v = 24.1 m/s. (a) Determine the angular speed of the wheel. (b) Relative to the axle, what is the tangential speed of a point located 0.243 m from the axle?
*July 16, 2013*

**Physics**

An electrostatic paint sprayer has a 0.200-m-diameter metal sphere at a potential of 25.0 kV that repels paint droplets onto a grounded object. What charge must a 0.100-mg drop of paint have to arrive at the object with a speed of 10.0 m/s?
*July 14, 2013*

**statistics **

A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
*July 8, 2013*

**statistics **

A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
*July 8, 2013*

**statistics **

1. Are there more broken bones in summer or winter? We get records about the number of fractures treated in January and July at a random sample of 25 emergency rooms. The 95% confidence interval for the mean change ( μd = μJan - μJuly )in the numbers of ...
*July 4, 2013*

**statistics **

The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
*July 4, 2013*

**statistics **

Which of the following criteria must be met to do a one-sample test for a proportion? A. The data values in the sample must be independent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than ...
*June 27, 2013*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
*June 27, 2013*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*June 27, 2013*

**Chemistry**

Can someone please explain this to me?! Please! Thank you! How much (in kilograms) ethylene glycol antifreeze (C2H6O2)(molar mass 62.02 g/mol) has to be added to 14.4 kg of water to get a mixture that freezes at -15.5 degrees C. For water Kf = 1.86 degrees C kg/mol
*June 21, 2013*

**Statistics**

There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
*June 18, 2013*

**English **

what does it mean to follow in someones footsteps exceedingly?
*May 31, 2013*

**Math**

Gerald can complete a math assignment in 2 hours and a physics assignment in 1 hour. If he has 8 hours to complete a set of assignments, how many math assignments can he complete if he decides to leave the science assignments for the next day? This situation is given by 2x + y...
*May 27, 2013*

**Statistics **

Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
*May 26, 2013*

**Statistics **

Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car ...
*May 25, 2013*

**Statistics **

The relationship between the number of games won during one season by a minor league baseball team and the average attendance at their home games is analyzed. A regression analysis to predict the average attendance from the number of games won gives the model y-hat = -2600 + ...
*May 25, 2013*

**Chemistry**

What is the intermolecular force for BaCO3?
*May 22, 2013*

**social studies**

I don't know the answer, I'm asking for help.
*May 15, 2013*

**social studies**

which of the following contributed to Britain's industrial revolution? A. large labor force C. powerful monarchy B. decreasing food D. decreasing money
*May 15, 2013*

**Math **

I am having trouble on this question. a cable TV company charges $24.95 per month for basic service and $6.95 per month for each premium channel. a customer's bill for one month is $45.80. write and solve an equation to find the number of premium chnnels the customer ...
*May 9, 2013*

**MATH**

If your starting salary increases 5% per year for 10 years, how does your salary at the end of the 10 years compare with your starting salary? It is nearly 63% higher It is 150% higher It is 50% lower It is 50% higher
*May 9, 2013*

**history**

write a brief description of the civil war activities in southern california from 1861-1865.
*May 6, 2013*

**Chemistry**

Why is this reaction considered exothermic? "Concentrated sulfuric acid dissolves in water and the solution becomes warmer." This is a homework question and when I answered the problem, I thought it was endothermic because the solution is gaining heat, but when my ...
*May 5, 2013*

**Math**

How long would it take to double your money at 15.86 percent with interest compounded annually?
*May 5, 2013*

**Chemistry **

cr(s)--->Cr^3(aq)+3e- and Pb2+(aq)+2e---->Pb(s) write a balanced equation Please help thanks
*May 5, 2013*

**Chemistry**

How do you find the equilibrium constant? ..steps?
*May 5, 2013*

**Chemistry II**

Calculate the pH at the equivalence point in the titration of 50ml of 0.20 M methylamine (Kb=4.3*10^-4) with a 0.40 M HCL solution.
*May 3, 2013*

**Calculus**

function f(x)=x3x2−1 defined on the interval [−16,16] A. Find the vertical asymptotes of function f(x) B. Find where it is concave up C. Find the inflection points
*May 2, 2013*

**Calculus**

function f(x)=x3x2−1 defined on the interval [−16,16] A. Find the vertical asymptotes of function f(x) B. Find where it is concave up C. Find the inflection points
*May 2, 2013*

**math**

if a woman has a 50 ft. piece of wire & cuts it into strips 1 2/3 feet long, how many pieces will she have
*May 1, 2013*

**chemistry, stoichiometry**

Consider the Balanced Chemical Equation 2N2+6H20-->4NH3+3O2 How many moles would be needed to react fully with 0.225 moles of N2?
*April 30, 2013*

**calculus**

Using 4x^2 - 9y^2 = 36 Find y by implicit differentiation and then solve the equation explicitly for y and differentiate to get y' in terms of x.
*April 29, 2013*

**Calculus**

Using 4x^2 - 9y^2 = 36 Find y by implicit differentiation and then solve the equation explicitly for y and differentiate to get y' in terms of x.
*April 29, 2013*

**chemistry**

a 2.3% (m/v) LiCI solution p;repared from 53.0 ml of a 10.0%(m/v)LiCI solution. what is volume in milliliters
*April 27, 2013*

**South Tahoe Middle School**

A loan of $20,000 at 8% with payments & interest of $1,800. What is the amount owed after 11 payments have been made?
*April 26, 2013*

**Help???**

Anyone know?
*April 22, 2013*

**Probability?**

A bag contains 7 green marbles, 9 red marbles, 10 orange marbles, 5 brown marbles, and 10 blue marbles. You choose a marble, replace it, and choose again. Find P(red, then blue).
*April 22, 2013*

**Calculus**

Find the area of the region. f(x) = x^3 g(x) = x^4 In the graph f is above g and they both intersect at (1,1)
*April 21, 2013*

**Maths**

Given that on average, an atom of gold weighs 3.27×10^−22grams, how much does an Avagadro’s number of gold atoms weigh (take Avagadro’s number to be 6.0221415×10^23).
*April 21, 2013*

**Intrest?**

1. Find the total amout if you deposit $600 at a rate of 5% for 2 years compounded anually. 2. Find the total amout if you deposit $800 at a rate of 8% for 4 years compounded anually.
*April 19, 2013*

**Algebra 1**

Rena has to pay the first $100 of her medical expenses each year before she qualifies for her insurance company to begin paying. After paying the $100 "deductible," her insurance company will pay 80% of her medical expenses. This year, her total medical expenses came...
*April 19, 2013*

**Uof Phoenix**

You divide 6x by 6. You will get one. Then you divide 12 by 6.
*April 19, 2013*

**chemistry**

wat chemical reactions are considered to be of importance to healthcare professionals? describe rational.
*April 18, 2013*

**Calculus**

Sketch the graph and find the area of the region described below. f(x)= -3xe^((-x)^2) Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = 0 to x = 3.
*April 18, 2013*

**Calculus**

Find the area of the shaded region. The area is shaded from 0,2 on the x-axis Given: y=0 and y= x^4-2x^3
*April 18, 2013*

**Calculus**

find the area of the region described below. f(x)= -e^((1/2)x) Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = -4 to x = 4.
*April 17, 2013*

**Calculus**

find the area of the region described below. f(x)=-4-sq rt of x Find the area of the region bounded below by the graph of f(x) and above by the x-axis from x = 0 to x = 4. Thank you!
*April 17, 2013*

**Help meee**

Answer from spreadsheet Answer from hand calculation Problem #1: Find the total amount if you deposit $500 at a rate of 5% for two years using simple interest. Year 1 Year 2 Problem #2: Find the total amount if you deposit $300 at a rate of 6% for three years using simple ...
*April 17, 2013*

**physic**

a 1.6kg block of wood is floating in water. what is the magnitude of the buoyant force the block?
*April 16, 2013*

**Math**

Create two different situations: one in which you use combinations and one in which you use permutations. Include specific details and an explanation about what makes each situation either a combination or permutation.
*April 16, 2013*

**physics**

a stone of mass 1 kg is tied to the end of a string 1m long . it is whirled in a vertical circle . if the velocity of the stone at the top be 4m/s , what is the tension in the string ?
*April 13, 2013*

**Calculus**

The velocity of an object t seconds after it started moving is t(t-6). Find the total change in the object's position in the 6th second.
*April 12, 2013*

**Calculus**

The velocity of an object t seconds after it started moving is 6). Find the total change in the object's position in the 6th second.
*April 11, 2013*

**math**

4xsquared+ 4x -3 =0 SOLVE
*April 9, 2013*

**math**

Anyone know what 1/2 is in simplest form??
*April 9, 2013*

**math**

What is 2:1 and 1:2 in simplest form?
*April 9, 2013*

**math**

Simplify the expression if possible. log(100^4z)
*April 7, 2013*

**math**

Let 2^a = 5 and 2^b = 3. Using exponent rules, solve the equation in terms of a and b. 0.4^x = 27
*April 6, 2013*

**chemistry**

What is the concentration when 60.0 mL of a 9.00 M HCl solution is diluted to 1.170 liters? and how do you solve this problem?
*April 4, 2013*

**Help? Math**

Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark 2.2 Switzerland 2.5 ...
*April 4, 2013*

**Math Ms. Sue! Steve! Any ideas?**

Help?
*April 4, 2013*

**Math**

Use equal intervals to make a frequency table for the average number of movies per person. You do not need to show tally marks. Country Average Number of Movies Turkey 0.5 Japan 1.2 UK 1.3 Finland 1.3 Austria 1.5 Germany 1.8 Spain 2.2 Sweden 2.2 Denmark 2.2 Switzerland 2.5 ...
*April 4, 2013*

**chemistry**

If a sample of HNO3 is found to contain 8.44 · 10-2 mol of N atoms how many moles of HNO3 molecules are present? Express your answer in scientific notation.
*April 3, 2013*

**Ms. Sue or Steve Help**

What school do you go to?
*April 3, 2013*

**English**

I'm writing a comparison paper on artworks and I'm just thinking either to write about two women painting (European/modern women) OR two churches Gothic/Romanesque). Which one do you think will have more visual/background information? I was thinking to write about the...
*April 1, 2013*

**Math**

190 students like the program 135 students think the program is unnecessary 220 students plan on running for student government next year. If a circle graph were made from this data, what would the measure of the central angle be for the group that likes the program? Round ...
*April 1, 2013*

**Chemistry**

I made a mistake. the initial concentration of NaOH is 1.0M.
*March 30, 2013*

**Chemistry**

Calculate the molar mass of a diprotic acid. It reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. I keep getting a molar mass of 500g/mol. but the options are all around ...
*March 30, 2013*

**Chemistry**

So you need to times the molarity by two?
*March 30, 2013*

**Chemistry**

Calculate the molar mass of a diprotic acid. It reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. I keep getting a molar mass of 500g/mol. but the options are all around ...
*March 30, 2013*

**Chemistry**

How many mL of 12M HCl is needed to create 350mL of 0.125M HCl?
*March 28, 2013*

**history**

lol wut?
*March 25, 2013*

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