Monday

February 8, 2016
Total # Posts: 4,663

**math**

Find the projection of u = <-5, 3> onto v = <1, 4>.
*February 8, 2016*

**Pre-cal**

For z1 = 4cis (7pi/6) and z2 = 3cis(pi/3), find z1 * z2 in rectangular form.
*February 8, 2016*

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check) ive been asking this question 4 times still no one answer . someone pls do .
*February 7, 2016*

**Physics**

Two capacitor plates are equally and oppositely charged. They are separated by 1.30 cm. An electron is released from rest at the surface of the negative plate and, at the same time, a proton is released from rest at the surface of the positive plate. Where do the electron and ...
*February 6, 2016*

**math**

is that a big deal? if it is , then im greatly sorry ....and could someone answer my question pls /display.cgi?id=1454771086
*February 6, 2016*

**math**

vf=10*a vf=sqrt(2ad) or 10a=sqrt2ad 100a^2=2*500*a a=10m/s^2 vf=10*10=100m/s
*February 6, 2016*

**physics (mechanics)**

find the constant force necessary to accelerate a car of mass 1000kg from 15m/s to 20m/s in 10s against resistance of 270N ? pls show work (answer is 770N just in case to check)
*February 6, 2016*

**Physics**

use s= ut +0.5at^2 give 500 = 0(t) + 0.5 (9.8)t^2 t = 10.10s
*February 5, 2016*

**Pre-cal**

What is the area of triangle ABC if a = 19, b = 14, and c = 23?
*February 5, 2016*

**Math**

Tom has taken 3 tests with an average of 88%. However, Tom really wants an A. To get an A, he has to have an average score of 93%. What score does he need on the final test to get an A? I just don't get it. Can someone walk me through the steps to get to the answer?
*February 4, 2016*

**Physics**

A rock climber throws a small first aid kit to another climber who is higher up the mountain. The initial velocity of the kit is 12.8 m/s at an angle of 65.7° above the horizontal. At the instant when the kit is caught, it is traveling horizontally, so its vertical speed ...
*February 4, 2016*

**Physics**

a crate of weight fg is pushed by a force P on a horizontal floor. (a) the coefficient of static friction is us, and P is directed at angle theta below the horizontal. show that the minimum value of P that will move the crate is given by P=usFgsectheta / 1-ustantheta (b) find ...
*February 4, 2016*

**Math**

There are 40 cows and chickens in a farmyard. One quiet afternoon, Lola counted and found that there were 100 legs in all. How many cows and how many chickens are there? thx...
*February 1, 2016*

**Do I have enough time**

Oh yea if you have notes and know what you are going to talk about. Just go for it but make sure you get it done earlier next time
*February 1, 2016*

**math**

whats sets of number does the number 9/10 have?
*February 1, 2016*

**Science**

A storm with winds over 120/km/h that can last several weeks is a? A.Tornado B Hurricane C Jet Stream D Thunderstorm I think its hurricane am i right?
*January 29, 2016*

**Analytical chemistry **

The hydrogen sulfide in a 79.168 g sample of crude petroleum was removed by distillation and collected in a solution of CdCl2. The precipitated CdS was then filtered, washed and ignited to create CdSO4. Calculate the percentage of H2S in the sample if 0.122 grams of CdSO4 was ...
*January 28, 2016*

**math**

Mr. Dunn estimates he uses 3 gallons of gas over the course of a week. How many miles per gallon does his car get when he drives 105 miles?
*January 28, 2016*

**history plz help**

thanks @Reed you helped me look at the article in another perspective.
*January 28, 2016*

**history plz help**

I don't get what it accomplished... i have this right now The Louisiana Purchase encompassed 530,000,000 acres of territory in North America that the United States purchased from France in 1803 for $15 million.
*January 28, 2016*

**history plz help**

Can you guys help me get started with this, I really appreciate what your doing. @Ms. Sue @Reed
*January 28, 2016*

**history plz help**

During the early 1800s, the United States tried to make peace with other countries in order to grow and develop. Give an example of one of these peace efforts and briefly explain what it hoped to accomplish.
*January 28, 2016*

**physics**

I got 71.6*10^4?
*January 27, 2016*

**physics**

The speed of a space shuttle is 3.2×10^6 cm/s. Convert this into miles per hour (mph) using only 12 inches/ft, 60 seconds/min, 60 minutes/hour, and 1 inch = 2.54 cm. Factor Analysis must be used. Express your result to three significant digits and in scientific notation.
*January 27, 2016*

**math**

A cookie recipe calls for 3/4 of a cup of flour and makes one dozen cookies. How many cookies can you make if you have 10 cups of flour and want to use it all? I said 160 cookies. I used a proportion to solve this but is there another way to solve it?
*January 27, 2016*

**physics**

Dolphins can hear ultrasound with frequencies up to 280 kHz. What is the speed of sound in water if the wavelength of ultrasound with a frequency of 2.80 × 10^5 Hz is 0.510 cm? How long would it take this sound wave to travel to a dolphin 3.00 km away?
*January 25, 2016*

**physics**

A ship anchored at sea is rocked by waves whose crests are 21 m apart. The waves travel at 5.6 m/s. How often do the wave crests reach the ship?
*January 25, 2016*

**Math**

So when I do that I would have 24 4/7 divided by 4?
*January 23, 2016*

**Math**

Is that 24 divided by 4 when you made 23 4/7(mixed fraction) an improper fraction or is 24 just a whole number?
*January 23, 2016*

**Math**

Can you explain this: For my math problem 23 4/7 divided 4 it says to estimate. What do I do?
*January 23, 2016*

**Math**

Can you help me? My math problem is: 23 4/7 divided by 4 and it says to estimate. What do I do?
*January 23, 2016*

**physics**

A human ear can hear as low as 15.6 Hz. If the speed of sound in the air was measured to be 340.5 m/s, calculate the wavelength of this wave.
*January 22, 2016*

**physics**

For an ocean wave that has the crests 6 m apart and passing a boat every two seconds, calculate the speed of the wave.
*January 22, 2016*

**algebra **

Please show work* . i dont get how to do this at all only 1/3 of the university students wanted to become teachers . if 2600 didnt want to become teachers, how many university students are there?
*January 21, 2016*

**math**

.25 lb burger costs $2.95 .50 lb burger costs $3.90 how much does a pound of beef cost?
*January 20, 2016*

**Spelling**

Word for finished 3rd letter is r and the 5th letter is u
*January 20, 2016*

**Social Studies**

What is a group of government officials?
*January 19, 2016*

**math 8**

steve, thank you so much for explaining this. I get it now.
*January 18, 2016*

**math 8**

still having trouble getting y. why multiply top by 2. first time doing this, sorry thanks for the help
*January 18, 2016*

**math 8**

solve the system of equations 5x+2y=11 3x-4y=4 give answer as decimal if required. any help would be appreciated, thank you
*January 18, 2016*

**Science Help**

What happens to the density of the air in the balloon as it is heated?
*January 17, 2016*

**math**

Thank you Ms.Sue
*January 14, 2016*

**math**

Adding= Sum What are those kind of words for subtract divide and multiply? I am not for sure what they are called.
*January 14, 2016*

**World History**

Which of the following tools would NOT help a geographer to understand the ways that a country’s boundaries changed over time? A.map B.timeline C.graph D.aerial photography
*January 14, 2016*

**Physics II**

Assuming equal point charges, calculate the magnitude of the charge in C if the electrostatic force is great enough to support the weight of a 1.95 mg piece of tape held 1.05 cm above another?
*January 13, 2016*

**Physics II**

A test charge of +2 μC is placed halfway between a charge of +6 μC and another of +4 μC separated by 10 cm. What is the magnitude of the force on the test charge?
*January 13, 2016*

**math**

A 4ft piece of pipe needs to be divided into pieces that are 2/3ft long. How many pieces are made? How many remaining?
*January 12, 2016*

**Health HELP ME!!**

Thx
*January 6, 2016*

**engineering maths. need answer asap**

But don't you convert it into the base units?
*January 4, 2016*

**geometry**

we have angle ABC = angle ACB = angle DEC=angle CDE, BC = 8, and DB = 2. Find AB.
*January 2, 2016*

**MATHS**

108
*January 2, 2016*

**Physics**

During volcanic eruptions, chunks of solid rock can be blasted out of the volcano; these projectiles are called volcanic bombs. The Figure shows a cross section of Mt. Fuji, in Japan. (a) At what initial speed would a bomb have to be ejected, at angle q0 = 35° to the ...
*January 2, 2016*

**Physics**

9886, where does it come from? How did you get it?
*December 28, 2015*

**statistics**

If the mean value of the weight of a particular brand of dog food is 20.6 lb and the standard deviation is 1.3, assume a normal distribution and calculate the amount of product that falls below the lower specification value of 19.7 lb
*December 21, 2015*

**LA**

HELP MEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
*December 16, 2015*

**LA**

i don't get the other comments that you posted
*December 16, 2015*

**LA**

In all together now Jordan uses appeals to reason to try to persuade her readers that her views are important. In a paragraph cite one example of each kind of appeal in her work. thank explain whether you find jordans appeals convincing supporting your ideas with logical ...
*December 16, 2015*

**Art**

Why is art fun
*December 14, 2015*

**Physics**

Fred and George who are identical twins, same body mass, are competing in aerial skiing. Fred hits the take off with a speed of 15.8, whereas George has a speed of 8.3. How much higher will Fred go?
*December 9, 2015*

**Problem Solving: Make a Table**

Water for irrigation is measured in acre-feet. One acre-foot is the volume of water that would cover one acre of land to a depth of one foot. How many acre-feet of water would it take to cover 600 acres to a depth of one inch?
*December 9, 2015*

**Language Arts 6A**

Which of theses is a category used in the passage to contrast falcons and hawks?
*December 5, 2015*

**english**

The film image thus became almost square during the early years of the talkies until the space occupied by the sound track on the film was successfully reduced. Can someone explain to me what this mean? I don't understand.
*December 5, 2015*

**Spelling**

I am working on synonyms and diagraphs. I need a 7 letter word, that means finished. The third letter is r. Fifth letter is probably u.
*December 2, 2015*

**Chemistry**

A 38.5 mL sample of HBr is titrated with 112 mL of 1.05 mol/L KOH. The density of the HBr solution is 1.75 g/mL. Calculate the percentage by mass of the HBr in the sample. How come we don't use density*volume to find the moles of HBr?
*December 2, 2015*

**Chemistry**

30.0 mL of 0.0200 mol/L NaOH are added to 70.0 mL of 0.0100 mol/L HCI. Calculate the [H3O+] and [OH─] of the resulting solution My answer: [OH-] = 1.00x10^-10 M; [H3O+] = 1.00x10^-4 M Teacher's answer: [OH-] = 1.00x10^-11 M; [H3O+] = 1.00x10^-3 M Am I missing ...
*December 1, 2015*

**Chemistry**

50 Ltr. Of a certain liquid is confined in a piston system at the extenal pressure 100 atm this pressure suddenly released and liquid is expanded against a contant atm pressure , vol. Of liquid increases by 1 Ltr and the final pressure of the liquid is 10 atm. Find the work done.
*December 1, 2015*

**physics**

Conserve momentum
*November 30, 2015*

**Chemistry**

A piece of copper alloy with a mass of 73.0 g is heated from 23.0◦C to 44.0◦C. In the process, it absorbs 558 J of energy as heat. What is the specific heat of this copper alloy?
*November 30, 2015*

**Math**

Can you explain how you got that please?
*November 30, 2015*

**Math **

A van travels for 3 hours at an average speed of 40 mph. How much longer must the van travel at an average of 55 mph so that the average speed for the entire trip will be 50 mph?
*November 30, 2015*

**Algebra**

Thank you!
*November 30, 2015*

**Algebra **

You are choosing between two different internet providers. Company A charges $75 for installation and $42 per month. Company B charges $30 per month for installation and $45 per month. After how many months will the total costs for Internet service through the two companies be...
*November 30, 2015*

**Math**

Yes thank you!!!
*November 30, 2015*

**Math**

You are offered two different sales jobs. Job A offers an annual salary of $36,000 plus a year end bonus of 1.5% of your total sales. Job B offers an annual salary of $32,000 plus a year end bonus of 2% of your total sales. How much would you have to sell to earn the same ...
*November 30, 2015*

**PreCalculas**

Ok thank you i dont know what i was doing wrong
*November 30, 2015*

**PreCalculas**

write sqrt36*3sqrt64 using exponential notation i keep getting 24 so am i doing it wrong or is that right im confused
*November 30, 2015*

**Pre-Calculus**

f(x) = cos(x) on the interval [−2π, 2π] (a) Find the x-intercepts of the graph of y = f(x). (Enter your answers as a comma-separated list.) (b) Find the y-intercepts of the graph of y = f(x). (Enter your answers as a comma-separated list.) (c) Find the ...
*November 29, 2015*

**Chemistry**

How to find the mass of a solid formed when: 45.00ml solution of 0.003 800 mol/L lead (II) nitrate is mine dish a 30.00 mL solution of 0.08800 mol/L strontium iodide
*November 29, 2015*

**Chemistry**

what mass of barium carbonate will dissolve in a 2.50L solutions of 0.0500 molar sodium carbonate
*November 29, 2015*

**Social Studies Check My Work**

1. People's occupations, their behavior, and their beliefs are a part of their (1 point) government. climate. technology. culture.•• 2. When geographers study human-environment interaction, they learn (1 point) how schools are run. how people and their ...
*November 25, 2015*

**Math**

True or false: If a is any positive real number, the graph of y=a^x will go through the point (0,1). True or false: x^3+2x^2 is an exponential equation because it contains exponents. I got true for both of them is that right?
*November 25, 2015*

**Social Studies Urgent**

Corrections- Are they right? 3. Which of the following is NOT one of the four major advances in early cultures? (1 point) the invention of tools•• the beginnings of agriculture the discovery that the world is round the development of civilization 4. Which of the ...
*November 25, 2015*

**Social Studies Urgent **

1. People's occupations, their behavior, and their beliefs are a part of their (1 point) government. climate. technology. culture.•• 2. When geographers study human-environment interaction, they learn (1 point) how schools are run. how people and their ...
*November 25, 2015*

**Social Studies Reed or Ms. Sue please Proofread**

1. People's occupations, their behavior, and their beliefs are a part of their (1 point) government. climate. technology. culture.•• 2. When geographers study human-environment interaction, they learn (1 point) how schools are run. how people and their ...
*November 25, 2015*

**Algebra 2**

Find the vertex of each of the following parabolas by averaging the x intercepts. Then write each equation in graphing form. Y=x^2-14x+40
*November 24, 2015*

**Algebra 2**

Find the vertex of each of the following parabolas by averaging the x intercept. Then write each equation in graphing form. Y=(x-3)(x-11)
*November 24, 2015*

**Social Studies**

Yes.
*November 24, 2015*

**Social Studies, Ms. Sue, Reed, Check My Work**

@Ms. Sue, Please review my answers.
*November 24, 2015*

**Social Studies, Ms. Sue, Reed, Check My Work**

1. Geographers use the five themes of geography to (2 points) study world history. organize information. study world music. measure locations.• 2. People invented flat maps because globes cannot show (2 points) names of continents. shapes of continents. enough detail.&#...
*November 24, 2015*

**English**

Choose the sentence that is written in active voice. A. A serious accident was prevented on the highway by Roger's quick thinking. B. Roger's quick thinking prevented a serious accident on the highway. C. A serious accident was prevented on the highway. D. A serious ...
*November 22, 2015*

**physics**

filament lamp: cost-80p efficiency-0.2 expected life- 1000 hours compact fluorescent lamp (CFL): cost- £3.00 efficiency-0.8 expected life- 8000 hours A filament lamp with a power rating of 100 w gives 2000 units of light. what power rating would a CFL need to provide ...
*November 22, 2015*

**chemistry**

I have two that I can not figure out: #1: calculate the MOLALITY of 10.00 g/L of the salt, if its molar mass is 100.0 g/mol and solution density D=1.100 g/mL work: 10.00 g NaCl x (1mL/1.100g) x (1kg/1000 mL)= 0.00909 kg 100.0 g x (1 mol NaCl/58.4 g Nacl)= 1.7 mol 1.7/0.0090= ...
*November 21, 2015*

**Check My Work Social Studies, Ms. Sue, Reed, Please**

Is 1 to study world history, or is it to organize information, @Ms. Sue
*November 20, 2015*

**Check My Work Social Studies, Ms. Sue, Reed, Please**

Correction- 2. People invented flat maps because globes cannot show (2 points) names of continents. shapes of continents. enough detail.•• 5. Ocean currents follow regular patterns related to (2 points) latitude.•• volcanoes. hurricanes. longitude. 8. Which...
*November 20, 2015*

**Check My Work Social Studies, Ms. Sue, Reed, Please**

1. Geographers use the five themes of geography to (2 points) study world history. organize information. study world music. measure locations.• 2. People invented flat maps because globes cannot show (2 points) names of continents. shapes of continents.• enough ...
*November 20, 2015*

**columbia high**

160 divided by 8 is 20. There is your answer.
*November 20, 2015*

**Math**

Bird flies 80m east, then 60m south, then straight up In to sky for 30m. A)at this point how far is bird from his nest?
*November 19, 2015*

**math**

Waiting for solution
*November 18, 2015*

**math**

Hey pls pls solve it for me.
*November 18, 2015*