Sunday

November 29, 2015
Total # Posts: 1,826

**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?
*February 21, 2013*

**Chemistry**

How many grams of solute are present in 875 mL of 0.180 M KBr?
*February 20, 2013*

**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?
*February 20, 2013*

**Need help asap****

Oh goodness. I'm deeply sorry. I wasn't trying to make anyone angry or annoyed.
*February 20, 2013*

**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?
*February 20, 2013*

**report**

thank you
*February 19, 2013*

**report**

What are key findings? I have to include this in a lab report. Thank you for any help
*February 19, 2013*

**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 ...
*February 19, 2013*

**math**

14=2/3(9y-15)
*February 18, 2013*

**science**

How do I make an acrostic that has to do with the word Wavelength?
*February 17, 2013*

**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 ...
*February 17, 2013*

**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?
*February 9, 2013*

**Chemistry**

Ooops, sorry Linda.
*February 9, 2013*

**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?
*February 9, 2013*

**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 ...
*February 8, 2013*

**math**

Jill is correct because angels is on any shape
*February 5, 2013*

**math**

thanks
*February 5, 2013*

**math**

I got (9,28) is that right.
*February 5, 2013*

**math **

solve using substitution y=4x-8 y=2x+10
*February 5, 2013*

**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 ...
*February 4, 2013*

**social studies**

Which of the following types of information are people LEAST comfortable revealing to professionals? a. emotional b. financial c. legal d. medical
*February 4, 2013*

**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...
*February 1, 2013*

**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
*February 1, 2013*

**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, ...
*January 30, 2013*

**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 ...
*January 30, 2013*

**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 ...
*January 29, 2013*

**Algebra**

Find three consecutive integers such that the product of the two largest is 29 more than the square of the smallest integer. (Enter your answers as a comma-separated list.)
*January 29, 2013*

**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?
*January 27, 2013*

**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.
*January 27, 2013*

**geometry**

if measure of angle SUT=3x+6 and measure of angle RUS=5x-4, find measure of angle SUT
*January 27, 2013*

**science **

Lipids: Not a polymer because _ __x's energy than carbs Saturated= Unsaturated= Nucleic Acids: RNA= DNA= Carbohydrates: Building blockks
*January 26, 2013*

**science**

I think it's about 20.
*January 26, 2013*

**science**

How many amino acids are there in protien
*January 26, 2013*

**Math**

I am a 4digits number with 6 hundreds and 5ones.The sum of all my digits is 15 .What number am I
*January 25, 2013*

**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
*January 21, 2013*

**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...
*January 21, 2013*

**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
*January 21, 2013*

**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...
*January 21, 2013*

**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-...
*January 21, 2013*

**Math**

7 snow days divide by the the amount of days in december which is 31 days (7/31) x 100 = 22.5 %
*January 21, 2013*

**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.
*January 21, 2013*

**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.
*January 18, 2013*

**Physics**

thank you
*January 18, 2013*

**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 ...
*January 18, 2013*

**trig proofs**

cotx+tanx=secx+cscx
*January 15, 2013*

**Math**

Number Sense How can you use 4 x 7 to find 8 x 7? Find the product.
*January 8, 2013*

**Calculus II**

ok thank you very much. Happy New Year
*December 30, 2012*

**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?
*December 30, 2012*

**Calculus II**

ok, thank you very much. Happy New Year
*December 30, 2012*

**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
*December 30, 2012*

**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
*December 30, 2012*

**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/...
*December 30, 2012*

**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
*December 18, 2012*

**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)
*December 18, 2012*

**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.
*December 17, 2012*

**Physics**

Who originally designed the planetary model of an atom? Bohr or Rutherford
*December 17, 2012*

**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 ...
*December 16, 2012*

**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...
*December 11, 2012*

**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. ...
*December 10, 2012*

**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?
*December 10, 2012*

**Chemistry 3A**

You have three moles of oxygen and hydrogen. And 1 mol of aluminum as well as one mole of aluminum hydroxide
*December 10, 2012*

**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
*December 10, 2012*

**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. ...
*December 10, 2012*

**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. ...
*December 9, 2012*

**Physics**

Pretend the hot brick extracts heat from the cold brick and becomes hotter. Would this violate the Law of Conservation of Energy?
*December 9, 2012*

**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. ...
*December 9, 2012*

**Physics**

A rapidly changing magnetic field in any region of space induces a rapidly changing A.Magnetic field or B.Electric field? which in turn induces a rapidly changing A.Magnetic field B.Electric field?
*December 8, 2012*

**Physics**

If your own mass is 70kg and the mass of a building is 4x 10^6kg and the distance between you and the building is 1m, in comparison to your own weight, estimate the force of attraction between you and the building.
*December 8, 2012*

**Physics**

A car weighing one ton is moving at 50km/hr and a truck weighing two tons is moving at 25km/hr. Both are moving in the opposite direction, which has more momentum? I think they are the same, but want to make sure
*December 8, 2012*

**Physics**

While stationary on a boat you are measuring the time it takes for the coin to leave your hand and hit the water.In order to measure that time you are tuned to the sound of the coin hitting the water. You know that it takes 5.5 seconds for the coin to leave your hand and hit ...
*December 8, 2012*

**Physics**

If one drops a sphere and a piece of paper from the same height of 10 meters(H=10m) and the sphere hits the ground in 1.4 secs and the paper in 2 secs, what is the gravity associated with the sphere and why did the impact time change between the paper and sphere?
*December 8, 2012*

**physics**

.436
*December 6, 2012*

**social studies**

what is the question to usa studies weekly 9
*December 4, 2012*

**science**

What does it mean to be a successful organism? Is bacteria the most successful organisms on earth?
*November 29, 2012*

**College Physics 1**

.767s
*November 28, 2012*

**ENGLISH**

hi ive been reading a book called, the berlin boxing club, and one of my hw assignments say i need to find 10 quotes in the book and im having trouble finding them. can u please help me? :)
*November 27, 2012*

**english**

hi ive been reading a book called, the berlin boxing club, and one of my hw assignments say i need to find 10 quotes in the book and im having trouble finding them. can u please help me? :)
*November 27, 2012*

**College Physics**

Suppose a planet is discovered that has the same total mass as the Earth, but half its radius. Calculate the acceleration due to gravity on the surface of this planet.
*November 27, 2012*

**physics**

The range of human hearing extends from approxmately 20 HZ to 20 000 HZ. Find the wavelenghts of these extremes when the speed of sound in air is equal to 343 m/s. A dolphin is 25 degrees C sea water emits a sound directed toward the bottom of the ocean 150 m below. How much ...
*November 21, 2012*

**algebra**

are you factoring? we are doing that right now if you need help
*November 21, 2012*

**social studies**

what religion was part of the Song Dynasty ?
*November 18, 2012*

**reading**

"It's raining cats and dogs" is an idiom for "it's raining really hard."
*November 8, 2012*

**Physics**

A 60 mm mortar round is capable of being launched at 540 km/hr. If a target is located at a distance of 0.6 km and the mortar takes 7.5 s to reach the target, at what angle must the launcher be set to hit the target?
*November 7, 2012*

**precal**

We have to use the equation f(x+Δ)-f(x) ----------- Δx
*November 6, 2012*

**precal**

Find the Difference quotient: 4/(x-3)^2
*November 6, 2012*

**algebra**

Writing an equation in standard form is good for using the quadratic formula, because it has A, B, and C. I hope that helps :)
*November 5, 2012*

**AP Chemistry**

A 2.50 L balloon is filled with helium gas at sea level, 1.00 atm and 32 degrees celsius. The balloon is released and it rises to an altitude of 30,000 ft. If the pressure at this altitude is 228 mm Hg and the temperature is -44 degrees celsius, what is the volume of the balloon?
*November 1, 2012*

**7th grade math Ms. Sue please!**

I need help with this too! Math is hard for me right now...
*October 30, 2012*

**chemistry**

To what volume must 25.0mL of 18.0M H2SO4 be diluted to produce 1.50 M H2SO4?
*October 28, 2012*

**chemistry**

A 150mL sample of 0.45 M HNO3 is diluted to 450 mL. What is the molarity of the resulting solution?
*October 28, 2012*

**chemistry**

i do not understand how to work the problem out.
*October 28, 2012*

**chemistry**

If 25.0mL of 0.56 M H2SO4 is diluted to a volume of 125 mL, what is the molarity of the resulting solution?
*October 28, 2012*

**MATH**

Given Pr(a)= 0.9, Pr(C|A)= 0.78 and Pr(D|B) = 0.38. find a. (A|C) = b. (A|D) = c. (B|C) = d. (B|D) =
*October 22, 2012*

**physics**

A hydrogen atom has a diameter of about 10.1 nm. Express this diameter in meters, millimeters, and micrometers.
*October 22, 2012*

**Finite---- PLEASE HELP**

A biologist finds that 32% of fruit flies have short wings and 27% have eye defects. Assuming these two events are independent, what is the probability that a randomly selected fruit fly has neither short wings nor eye defects?
*October 22, 2012*

**U.S History**

Why did slavery continue after the Revolution?
*October 17, 2012*

**Algebra **

sorry, having a brain malfunction but which is a function: "x is a student y" "x is the biological daughter of mother y"
*October 8, 2012*

**living enviornment**

what is the average length of a single cell in micrometers? a)2,000um b)100um 3)10um 4)200um
*October 4, 2012*

**math**

The rate is: type # of vehicles car 6 truck 10 SUV 14 Mini Van 15
*October 4, 2012*