Monday
February 8, 2016

Posts by sam

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
B
November 22, 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

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