Thursday

April 17, 2014

April 17, 2014

Total # Posts: 1,660

**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.

**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 ?

**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.

**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.

**math**

4xsquared+ 4x -3 =0 SOLVE

**math**

Anyone know what 1/2 is in simplest form??

**math**

What is 2:1 and 1:2 in simplest form?

**math**

Simplify the expression if possible. log(100^4z)

**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

**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?

**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 Fra...

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

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 Fra...

**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.

**Ms. Sue or Steve Help**

What school do you go to?

**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...

**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 you...

**Chemistry**

I made a mistake. the initial concentration of NaOH is 1.0M.

**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 1...

**Chemistry**

So you need to times the molarity by two?

**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 1...

**Chemistry**

How many mL of 12M HCl is needed to create 350mL of 0.125M HCl?

**math**

For the function f(p) an input of 3 yields an output value of 6. What value of p would you use to have f(5p) = 6?

**Chemistry**

K1 = 0.727 K2 = 12.1 T1 = 2000 T2 = 3000 Solve for the standard enthalpy of formation. They gave me the formula ln(K2/K1) = DeltaH /R (T2 - T1 / T1T2) The answer is supposed to be in KJ/mol and I keep getting 2.022 but its not right. I'm not sure what Im doing wrong

**math**

For the function f(p) an input of 3 yields an output value of 6. What value of p would you use to have f(5p) = 6?

**Chemistry**

A 50.0 mL sample of 0.10 M pyridine, C5H5N, is titrated with 0.2 M HBr. Calculate the pH to one decimal place when the following volumes of titrant have been added. 0.00 mL a) 0ml b)17ml c)25ml d)40ml

**math**

6^(2log(x)) = 8

**math**

Let 2^a = 5 and 2^b = 10. Using exponent rules, solve the equation in terms of a and b. 10^x =(1/64)

**statistics**

In a certain region, the mean annual salary for plumbers is $51,000. Let x be a random variable that represents a plumber's salary. Assume the standard deviation is $1300. If a random sample of 100 plumbers is selected, what is the probability that the sample mean is great...

**statistics**

the breaking distance of a Honda CRV can be approximated by a normal distribution, where the mean is 53 meters and the standard deviation is 3.8 meters. Let x be a random variable that represents a braking distance. Find the probability that a randomly selected braking distanc...

**P Value Math Statistics**

Find the P-value for the indicated hypothesis test with the given standardized test statistics, z. Decide whether to reject H0 for the given level of significance a. two-tailed test with test statistic z= -1.57 and a=0.04

**statistics**

In a normal distribution with mu = 25 and sigma = 3, what number corresponds to z = -3? is it 16, 18, or 20

**Gen Math**

A school dance has 228 students. There are 63 fewer girls than twice as many boys. How many boys and girls attended the dance?

**Economics**

A $90,000 investment is made. Over a 5 year period, a return of $30,000 occurs at the end of the first year. Each successive year yields a return that is $3,000 less than the previous year's return. If money is worth 5 percent, use a gradient series factor to determine the...

**Finance**

You plan to open a retirement account. Your employer will match 50 percent of your deposits up to a limit on the match of $2500 per year. You believe the fund will earn 12 percent per year over the next 30 years, and you will make 30 deposits of $5000, plus 50 percent employer...

**college algebra**

driving along a crowded freeway you notice that it takes a time to go from one mile marker to the next. when you increase your speed by 8.4 mi/hr the time to go one mile decreased by 14 seconds. What was your original speed?

**Chemistry**

How many grams of solute are present in 875 mL of 0.180 M KBr?

**Chemistry...**

The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees celsius and a total pressure of 762 torr. What is the partial pressure of the oxygen gas? What formula do I need to use?

**Need help asap****

Oh goodness. I'm deeply sorry. I wasn't trying to make anyone angry or annoyed.

**Need help asap** **

The oxygen gas emitted from an aquatic plant during photosynthesis is collected over water at a temperature of 25 degrees celsius and a total pressure of 762 torr. What is the partial pressure of the oxygen gas? What formula do I need to use?

**report**

thank you

**report**

What are key findings? I have to include this in a lab report. Thank you for any help

**Physics **

A plant falls from the windowsill of an apartment in a very tall building. If the floor of your apartment is 12.19 m above the ground, and it takes the plant 0.2580 seconds to cross your 9 ft window, from what height did the plant fall? ? m Explain what would be different if t...

**math**

14=2/3(9y-15)

**science**

How do I make an acrostic that has to do with the word Wavelength?

**Statistics**

These are the only ones that I am having problems with. Please help.. 8.You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Interpret the results and compare the wi...

**Chemistry**

On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.5898kJ?

**Chemistry**

Ooops, sorry Linda.

**Chemistry**

On a 10.5 ounce bag of potato chips, the manufacturer states that the single serving is one ounce, which is equivalent to 150 calories. How many kilojoules are in this bag of potato chips? Is it 6.898 kJ?

**science **

Newton’s Second Law of Motion is expressed as F = ma. If you are pushing a lawn mower in your backyard and suddenly double the pushing force, what will happen to the lawn mower's rate of acceleration? The mass of the lawn mower is constant. A. The acceleration will do...

**math**

Jill is correct because angels is on any shape

**math**

thanks

**math**

I got (9,28) is that right.

**math **

solve using substitution y=4x-8 y=2x+10

**Physics**

According to Anna, on Earth, Bob is on a spaceship moving at 0.8c towards Earth, and Carl, a little farther out, is on a spaceship moving a 0.9c towards Earth. According to Bob, how fast is Carl moving relative to Earth? (a) According to Bob, how fast and in what direction is ...

**social studies**

Which of the following types of information are people LEAST comfortable revealing to professionals? a. emotional b. financial c. legal d. medical

**Chemistry 3A**

You want to make the following buffer: 5% glucose, 100 mM tris and 10 mM EDTA in a final voume of 300ml. Your stock solutions are 20% glucose, 1M tris and 0.5M EDTA. The diluent is distilled water. Determine how much of each you will add to make the desired buffer. I know this...

**Math**

Calculate how long a de-orbit burn must last in minutes and seconds to achieve the Shuttle’s change in altitude from 205 miles to 60 miles at perigee.Use the equations and conversions provided below in method 1 or method 2 to find the required burn time

**penn foster**

im trying to finish these classes soon so i can start college, but honestly they are too complex. and i NEED HELP!!!! I have 1-5 done. 6. In the Mongol Empire, the plague A. provided new oppurtunities for territorial expansion B.ended further expansion C. had no effect, becaus...

**physics**

Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's cl...

**Physics**

Bob and Bob Jr. stand at open doorways at opposite ends of an airplane hangar 25 m long. Anna owns a spaceship, 40 m long as it sits on the runway. Anna takes off in her spaceship, then swoops through the hangar at constant velocity. At precisely time zero on both Bob's cl...

**College Algebra**

V= 4/322/7r^ 3 v= 4/3 *22/7*(6 1/4 in)^3 v=3/4 * 22/7 * 15625/64 v= 1023.065476 how to change to a mix-number?

**College Algebra**

V= 4/322/7r^ 3 v= 4/3 *22/7*(6 1/4 in)^3 v=3/4 * 22/7 * 15625/64 v= 1023.065476 how to change to a mix-number?

**College Algebra**

I like to change this(1023.065476) whole number into a mix-number to find the volume of the sphere (6 1/4 in) using 22/7 for pie.

**geometry**

if measure of angle SUT=3x+6 and measure of angle RUS=5x-4, find measure of angle SUT

**science **

Lipids: Not a polymer because _ __x's energy than carbs Saturated= Unsaturated= Nucleic Acids: RNA= DNA= Carbohydrates: Building blockks

**science**

I think it's about 20.

**science**

How many amino acids are there in protien

**Math**

I am a 4digits number with 6 hundreds and 5ones.The sum of all my digits is 15 .What number am I

**Math 7A**

Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function. can someone help me i'm stuck on this question

**alg/trig**

The first thing you want to do is get rid of x in the denominator, because that simplifies things quite a bit. Think of the easiest common denominator between 9/x and 9/(x-2), which would be x(x-2). You know that x-2/x-2 = 1, regardless of the value of x; the same with x/x, so...

**Math**

10^5.4 = 251188.6432 = 2.5 X 10^5 You can just plug this in the calculator. I think it's two significant figures

**Physics**

t(Earth) = t(satellite) / (square root) 1 - (v/c)^2 = t(satellite) / (square root) 1 - [ (3.9 x 10^3) / (3x 10^8)^2 ] = (1 - 1.7 x 10^-10)^ - 1/2 [ t(satellite) ] t(Earth) = (1 + 8.5 x 10^-11) [ t(satellite) ] GMEarth = (6.67 x 10^-11 N x m^2/kg^2) (5.98 x 10^24 kg) = 4.0 x 10...

**Physics**

A GPS satellite orbits at an altitude of 2.0 x 10^7 m and a speed of 3.9 x 10^3 m/s, Earth’s radius is 6.4 x 10^6 m, and a point at its equator has tangential speed of 460 m/s, By approximately what fraction must the time be adjusted to account for both regular/speed-depe...

**Math**

7 snow days divide by the the amount of days in december which is 31 days (7/31) x 100 = 22.5 %

**math **

How would I write 2 inequalities that describe in basketball that 2 points = field goal and 1 point = free throw and I have scored at least 3 points in every game this season and 15 points for the most points in one game? Please Explain! I don't understand.

**Math**

Use the function rule, y = 2x + 5, to find the values of y when x = 1, 2, 3, and 4. Write the answers as ordered pairs that would be used to graph the function.

**Physics**

thank you

**Physics**

The kinetic energy of a proton is half its internal energy. What is the proton's speed? Kinetic energy is (Yu - 1) (mp) (c)^2 = 1/2 (mp) (c)^2 Yu = 1.5 Yu = 1/(square root) 1 - (u/c)^2 1/(square root) 1 - (u/c)^2 = 1.5 u= 0.745c How do I solve for u? I'm extremely conf...

**trig proofs**

cotx+tanx=secx+cscx

**Math**

Number Sense How can you use 4 x 7 to find 8 x 7? Find the product.

**Calculus II**

ok thank you very much. Happy New Year

**Calculus II**

Find x and dx using trigonometric substitution of (integral) square root of 4x^2 - 9 divide by x x = 2/3 sec x dx = 2/3 tan x dx Is this right so far?

**Calculus II**

ok, thank you very much. Happy New Year

**Calculus II**

Okay then, is this the final answer = (5-x)(3e^3x) + (integral) -- (1/3)e^3x = (5-x)(3e^3x) + (1/9)e^3x + C

**Calculus II**

Integrate using integration by parts (integral) (5-x) e^3x u = 5-x du = -dx dv = e^3x v = 3e^3x I wonder if this is right so far. = uv - (integral) v du = (5-x)(3e^3x) - (integral) (-3e^3x) =(5-x)(3e^3x) + (integral) (3e^3x) = (5-x)(3e^3x) + 9e^3x + C

**Chemistry**

Question: A solution of Silver nitrate, AgNO3, contains 1.08 grams in 250 cm3. What is its molarity? Solution: Molar mass of Silver nitrate = 108 g/mole. n(AgNO3) = 1.08 grams of AgNO3 x 1 mole of AgNO3108 grams AgNO3 = 0.01 mole. Number of moles in 1 dm3 = 0.01 mole x 1000/25...

**Physics**

11 4 n + B ----> ___?___ + He 2 7 8 A. Li or B. Li 235 4 Pa ------> ___?___ + He 91 2 A.230 or B. 231 Ac Ac

**math**

the expression a^2(b^3)/a^-4(b^2) is equivalent to 1 a^6/b^5 2. b^5/a^6 3. a^2/b 4. a^-2(b^-1)

**Physics**

A car and a bus are moving down a hill, the bus is 3X heavier than the car and the speed of the car is 3X faster than the bus. Compare their momentum and K.E.

**Physics**

Who originally designed the planetary model of an atom? Bohr or Rutherford

**physics**

Maxwell's equations proved that a. Light is a mechanical phenomena b. Light is a chemical phenomena c. Light is a phenomenal phenomena d. Light is an electromagnetic phenomena I think the answer is either a or d. But I'm pretty sure its d Thank you for any help and hap...

**8th Grade English**

My teacher for my english class at school marked off for these questions and said I could redo it and turn it in tomorrow. I am for sure I did these right. Here are the questions. Underline the verb in the parentheses that agrees with the subject. 1. In the Northern Hemisphere...

**Physics, asap please**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...

**Science **

What is the Mass number and Atomic number for the element B (Boron)? It is for a homework sheet and I am blanked out. I forgot my text book. Can anyone help me?

**Chemistry 3A**

You have three moles of oxygen and hydrogen. And 1 mol of aluminum as well as one mole of aluminum hydroxide

**Chem**

PV = nRT - Change pressure to atm - Change grams of oxygen to mol of oxygen for n - Change degrees in celsius to kelvin which in this case is 273 K. Write all of the units of P, n, R and T and it will cancel out to get liters for volume

**Physics**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...

**Physics**

If a sphere and paper are dropped from 10 meters and the sphere hit the ground in 1.4 seconds and the paper hit in 2 seconds, why did the impact time in case of the piece of paper change in comparison to the sphere? A. a=(Wt-R)/m;a=g B. a=(Wt-R)/m;a>g C. a=(Wt-R);a<g D. ...

**Physics**

Pretend the hot brick extracts heat from the cold brick and becomes hotter. Would this violate the Law of Conservation of Energy?

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