Tuesday

August 30, 2016
Total # Posts: 3,360

**Physics**

In an electric shaver, the blade moves back and forth over a distance of 2.2 mm in simple harmonic motion, with frequency 116 Hz. Find (a) the amplitude (in mm), (b) the maximum blade speed, and (c) the magnitude of the maximum blade acceleration. I got that (a) is 1.1 mm, but...
*December 5, 2011*

**spanish**

Could someone please read my (corrected) summary in Spanish for grammer and fluidity? The English version appears below for help. Thanks! Spanish: Al principio del cuento, el narrador y su familia de braceros migratorios tenían que mudarse a Fresno porque la cosecha de ...
*December 4, 2011*

**spanish**

Could someone please proofread this summary in Spanish on a short story? The English version is also below. Thank you. Spanish: Al principio del cuento, el narrador y su familia de braceros migratorios tenían que mudarse a Fresno porque la cosecha de fresas se hab&...
*December 4, 2011*

**chemistry**

Thank you, Dr. Bob! Wish YOU would have written my chemistry book!
*December 3, 2011*

**chemistry**

Please help again. How many grams of lithium are required to completely react with 70.7 mL of N2 gas at STP when given the following reaction: 6Li + N2 = 2Li3N
*December 3, 2011*

**algebra**

During the first part of a trip a canoeist travels 71 miles at a certain speed. The canoeist travels 5 miles on the second part of the trip at the speed 5mph slower. The total time for the trip is 4hrs. Waht was the speed on each part of the trip
*December 3, 2011*

**Chemistry**

thanks! Duh! Got it! Yippie!
*December 3, 2011*

**Chemistry**

Here's how I worked it: P= ? n= 0.0155 mol v=206mL so .206L t=30C +273 is 303K then 0.0155mol *0.0821 L*atm/mol*K *303K divided by .206L which gives you 1.87 mmHg What did I do wrong?
*December 3, 2011*

**Chemistry**

What is the pressure in millimeters of mercury of 0.0155 mole of He gas with a volume of 206 mL at a temperature of 30 degrees C? I used the ideal gas law and ended up with 1.87 mmHg but it said that was wrong. Please help.
*December 3, 2011*

**algebra 2**

Write an equivalent expression using radical notation 1.(a^2b^2)^1/9 Use the laws of exponents to simplify 2.6^3/5* 6^5/10
*December 3, 2011*

**spanish**

1) un traje de baño 2)el impermeable 3)gafas de sol 4)los zapatos de tenis 5)centro comercial 6)tarjeta de crédito
*December 2, 2011*

**Chemistry**

Which is a polar covalent bond? PbCl2 or CS2?
*December 2, 2011*

**math**

Subject cars. A scale drawing if an automobile has a scale of 1 inch = 1/2 foot. The actual width of the .car is 8 feet. What is the width on the scale drawing
*December 2, 2011*

**Math**

What adds up to get 100%? 68% , 1/2 , 60% ,1/20 , 1% , 0.9 , 0.04 ,13/20 , 1/7 , 3/25 ,16% ,55% , 0.02 , 1/9 , 0.15 , 1/8 , 24% , 0.44 , 0.06 , 1/6 , 1/4 , 29% , 0.037 , 1/3 , 19% , 17/50
*December 1, 2011*

**algebra**

Darla is building a new deask. to make sure she had made a square corner, she measures 4ft. from the corner along one edge and 6ft from the corner long the othe edge . how long should the diaonal be between those two points if the corner is a right angle? (round to the nearest...
*December 1, 2011*

**algebra**

Guy wire. How long is a guy wire reaching from the top of a 24ft ploe to a point on the ground 16 feet from the pole What is the exact length? what is the lenght approximated to three decimal palces?
*December 1, 2011*

**Physics**

A 0.165-kg ball, moving in the positive direction at 10 m/s, is acted on by the impulse shown in the graph below. What is the ball's speed at 4.0 s?
*November 30, 2011*

**Math **

But we don't post to use a calculator. It says to estimate.
*November 30, 2011*

**Math **

What is 21% of 41? I think it is 10 but I'm not for sure.
*November 30, 2011*

**statistics**

Measures of Central Tendency,variability, and postion 12th Grade math class. organize the data 78,67,95,85,84,86,82,75,85,94,91,57,78,77,88,90,91,86,84,82,75,58,73,75. Then do 4 columns of Grades,Deviations,Squares,and Z-Scores
*November 30, 2011*

**statistics**

What is the probability that a student in a college of 650 students in both a math major and a computer science major ( assuming these events are independent) If there are 72 math majors and 105 computer science majors?
*November 30, 2011*

**Cert III lab skills**

Explain how to calculate preparing 250.0ml of 1.25 mol/L solution of Na2CO3(aq)
*November 29, 2011*

**Math**

Ragu ran the first 3 miles of a 5 mile race in 24 minutes. What percent of the race has he run? Please help me
*November 29, 2011*

**phi 103**

1. Logic can help analyze ethical problems. (Points : 1) True False 2. Putting an argument into premise-conclusion form can make it easier to (Points : 1) ignore the argument. think the argument is pretty. evaluate the argument. avoid the argument. 3. Karl Popper advocates, as...
*November 26, 2011*

**math**

If X=3 cm, Y=5 cm, Z=3 cm, W=5 cm, and V=2, what is the volume of the object?
*November 26, 2011*

**math**

Three cards are drawn without replacement from a well-shuffled standard deck of 52 playing cards. Find the probability that none is a face card.
*November 23, 2011*

**geometry**

Given l parallel to m, find the measures of each angle. <PTU
*November 22, 2011*

**math**

yes divide 141 by 7
*November 21, 2011*

**Biology**

describe the following processes in the plant life cycle and why they are important for the plant to complete, listing all of the plant hormones involved and describing their functions: 1) elongation of the plant shoot. 2) the process by which seeds orient themselves. 3) ...
*November 21, 2011*

**algebra**

1. Jodie biycles 5km/h faster than Predup. In the same time it takes Predup to bicycle 60km, Jodie can bicycle 75km. How fast does each bicyclist travel? 2.The officejet printer can copy Janet's dissertation in 20min. The LaserJet printer can copy the same document in ...
*November 18, 2011*

**algebra**

1. Find the LCM of (8+7), (64-49v^2), and (8-7v) 2. Find the LCM of 14x^7 and 98x^5 3. Find all numbers for which the rational expression is undefined 5/v-9
*November 18, 2011*

**algebra**

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and porportion to complete the following table. hat sizes 7 1/4 7 1/8 Head circumference (to nearest 1/5inch) 22 4/5 Head circumference (to nearest centimeter...
*November 17, 2011*

**algebra**

Hat sizes are determined by measuring the circumference of one's head in either inches or centimeters. Use ratio and porportion to complete the following table. hat size Head circumference 7 1/4 (to nearest 1/5inch) 7 1/8 22 4/5 Head circumference (to nearest centimeter) 58
*November 17, 2011*

**algebra**

The stopping distance d of a car after the brakes are applied directly as the square of the speed r. If a car traveling 80mph can stop in 360ft, how many feet will it take the same car to stop when it is traveling 90mph
*November 17, 2011*

**algebra**

The distance d when a spring is stretched by a hanging object varies directly as the weight w of the object. If the distance is 58cm when the weight is 3kg, what is the distance when the weight is 8kg
*November 17, 2011*

**algebra**

The distance d when a spring is stretched by a hanging object varies directly as the weight w of the object. If the distance is 58cm when the weight is 3kg, what is the distance when the weight is 8kg
*November 17, 2011*

**algebra**

1. The speed of a passenger trin is 18mph faster than the speed of a freight train. The passenger train travels 260 miles in the same time it takes the feight train to travel 170 miles. Find the speed of each train.
*November 17, 2011*

**Chemistry**

Thank you so much, Dr. Bob! :)
*November 17, 2011*

**Chemistry**

Purple light in the visible region of the electromagnetic spectrum has a shorter wavelength than does the green region of the spectrum. Which of the following can you conclude? Is it: a)a photon of purple light has a higher frequency than does a photon of green light or b) ...
*November 17, 2011*

**math**

1. The stopping distance d of a car after the brakes arecapplied varies directly as the square of the speed r. If a car traveling 80 mph can stop in 360ft, how many feet will it take the same car to stop when it is traveling 90 mph. 2.The distance d when a pring is stretched ...
*November 16, 2011*

**Calculus**

A man is in a boat 4 miles off a straight coast. He wants to reach a point 10 miles down the coast in the least possible time. If he can row 4 miles per hour and run 5 miles per hour, where should he land the boat?
*November 16, 2011*

**physics**

At 15 minutes past the hour, a 50 g mouse runs up a grandfather clock and sits himself down at the end of the minute-hand. If the minute-hand for the clock is 16 cm long, what is the magnitude of the torque exerted by the mouse on the minute-hand? Give your answer in the ...
*November 15, 2011*

**Chemistry**

Yes
*November 14, 2011*

**chemistry**

For the reaction: A + 3B = 4C Which of the following provides the direct link between the amount of reactant A and the amount of product C? -coefficients in the equation -molar mass of C -the reactant B or -molar mass of A?
*November 14, 2011*

**Chemistry**

What is the electron geometry if you have 4 electron groups around the center atom?
*November 14, 2011*

**Chemistry**

A sodium cation is what?
*November 14, 2011*

**chemistry**

When gas is burned: CH4 + 2O2 = CO2 + 2H2O, how many moles of water are produced when 6.2 mol of methane are burned?
*November 14, 2011*

**chemistry**

Dr. Bob, Thank you so much for taking the time to help me. God bless all your work with us. However, I'm still confused b/c these were my choices: 0 mol NH3, 0.038 mol N2, 0.333 mol N2H4, O.150 mol NH3,~0 mol N2, 0.300 mol N2H4, ~0 mol NH3, 0.38 mol N2, 0.188 mol N2H4 and...
*November 14, 2011*

**chemistry**

In a reaction vessel, the following reaction was carried out using 0.250 mol of NH3 and 0.100 mol of N2, 4NH3(l) + N2 (g) = 3N2H4 (l) what is the compositon in moles in the vessel when the reaction is completed? Is the answer: 0 mol NH3, 0.063 mol N2, and 0.188 mol N2H4?
*November 14, 2011*

**Math**

Find the number c that satisfies the conclusion of the Mean Value Theorem: x^3+x-9 [0,2]
*November 13, 2011*

**Math**

Ming dropped a package of 8 light bulbs and 2 of the bulbs broke. Write two equivalent fractions to represent the fraction of the bulbs that broke. Please help
*November 12, 2011*

**Physics **

can someone check? Which has greater volume: 1 kg of gold or 1 kg of water? a. The gold has greater volume. b. The water has greater volume. c. Gold and water have the same volume. Is it a? I know it's not b. The stones in an arch are . . . a. rarefied b. torqued c. under ...
*November 12, 2011*

**statistics**

Post your answer first
*November 11, 2011*

**Business English **

Dear Kashi, Will you please answer the following questions about your company products advertised in October 2011 Dwell magazine? We are interested ordering some of your products such as snacks. 1.If we finally make a deal, is it possible to start importing your products at ...
*November 11, 2011*

**Business English **

Dear Kashi, Will you please answer the following questions about your company products advertised on October 2011 Dwell magazine? We are interested in ordering some of your products such as snacks. 1. If we finally make a deal, is it possible to start importing your products ...
*November 11, 2011*

**Business English **

Dear Kashi, Will you please answer the following questions about your company products advertised on October 2011 Dwell magazine? We are interested ordering some of your products such as snacks. 1. If we finally make a deal, is it possible to start importing your products at ...
*November 11, 2011*

**Business English **

These wrongs you are referring is about the second email right? Because there I need to focused. I will try
*November 11, 2011*

**Business English **

is my corrections not enough? I have to make more? We have to turn the first e-mail into Routine inquiry I made the second e-mail is not right? corrections needed?
*November 11, 2011*

**Business English **

This email must me turned into a Routine Inquiry. Hello, I'm currently having a retail company that I import biological products, called 'Healthy life'. I saw your company advertisement on October 2011 in Dwell magazine and I decided to communicate with you. I'...
*November 11, 2011*

**Business English **

This email must me turned into a Routine Inquiry. Hello, I'm currently having a retail company that I import biological products, called 'Healthy life'. I saw your company advertisment on october 2011 in Dwell magazine and decided to communicate with you. I'm ...
*November 11, 2011*

**business ENGlish - Claim letter**

the amount of $60 is my wrong. Because of this circumstances, I am requesting a refund of $100. I believe this is a fair amount due to the fact that municipal tax dollars were spent on maintenance of the parks.
*November 11, 2011*

**business ENGlish - Claim letter**

Dear Mr James Nagol I held a family reunion at Whitewater Park on Saturday at the OAK Pavilion. I pay for reservation $100. i am sorry to say we did not have a good experience. when my guests arrived the picnic site was littered with trash. My family had to spend the first ...
*November 11, 2011*

**business ENGlish - Claim letter**

This is the exercise below i'm gonna write my answer: You need to write the Parks Board in your country a request for a refund. You held a family reunion at whitewater park on Saturday at the OAK pavilion which you had reserved for your group at a cost of $100. when the ...
*November 11, 2011*

**psy**

i don't understand how to do a good outline
*November 10, 2011*

**psy**

yes i would I also have two others also this is everything. · Anna, an adolescent girl, is very much in love with her boyfriend who is three years older than she. He is putting a lot of pressure on her to have sex. At the same time, she is anxious about her parents’...
*November 10, 2011*

**psy**

Anna, an adolescent girl, is very much in love with her boyfriend who is three years older than she. He is putting a lot of pressure on her to have sex. At the same time, she is anxious about her parents’ attitude towards her boyfriend. Her mother constantly warns her ...
*November 10, 2011*

**algebra**

Find all numbers for which the rational expression is underfined 1.-14/25v 2.s^3-9s/s^2 -64
*November 10, 2011*

**algebra**

1.FIND THE LCM OF 10X^7 AND 50X^4 2.FIND THE LCM OF x^2 -36 AND x^2 + 11x +30 3.FIND THE LCM y^3+8y^2+16y, y^2 -8y 4.FIND The LCM Of 15z^2 +60z and 3z^2 + 15z +12
*November 9, 2011*

**Grammar**

In the following sentence, is the word empty an adjective? It seems like it would be a noun/direct object The same with this sentence: The good bike was expensive. Is expensive a noun/direct object, or an adjective?
*November 9, 2011*

**english**

need a poem that is similar in nature to katy perry's firework. can't find anything anywhere. Can anyone help me?
*November 8, 2011*

**trig**

find all the values of x that satisfy the equation: 2sin^2(x) + 1 = 3sin(x).
*November 7, 2011*

**physics**

Two blocks with masses m1 = 10.9 kg and m2 = 79.3 kg, shown in the figure, are free to move. The coefficent of static friction between the blocks is 0.66 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against m2?
*November 7, 2011*

**algebra**

What is your remaining balance.
*November 7, 2011*

**Genectics**

What are the possible genotypes of a woman who has normal color vision?
*November 5, 2011*

**light**

An object 5 millimeters high is located 15 millimeters in front of a plane mirror. How far from the mirror is the image located? answer 15 millimeters.
*November 4, 2011*

**Calculus**

A truck gets 377/x mpg when driven at a constant speed of x mph (between 25 and 75 mph). If the price of fuel is $1 per gallon and the driver is paid $8 per hour, at what speed between 25 and 75 mph is it most economical to drive? (Give your answer correct to the nearest full ...
*November 4, 2011*

**Calculus**

A truck gets 377/x mpg when driven at a constant speed of x mph (between 25 and 75 mph). If the price of fuel is $1 per gallon and the driver is paid $8 per hour, at what speed between 25 and 75 mph is it most economical to drive? (Give your answer correct to the nearest full ...
*November 4, 2011*

**Calculus**

A truck gets 377/x mpg when driven at a constant speed of x mph (between 25 and 75 mph). If the price of fuel is $1 per gallon and the driver is paid $8 per hour, at what speed between 25 and 75 mph is it most economical to drive? (Give your answer correct to the nearest full ...
*November 4, 2011*

**Science**

Examine the obvious environmental impacts as well as significant social and physical ramifications of urban sprawl. What is the relationship between landscape and psychological well being? After defining this relationship, discuss how the presence or absence of natural beauty ...
*November 2, 2011*

**economics**

I need a quote for a positive and normative statement
*November 1, 2011*

**science**

In the United States, we are fortunate to have an abundant supply of food, and much of this is due to our agricultural technology. However, there are many concerns about our food source, including genetically modified crops, the use of more chemicals, and climate change just ...
*November 1, 2011*

**Math**

Is this a rational, irrational, or not a real number the square root of 49 and the square root of -81
*October 31, 2011*

**American History**

Which is most accurate regarding the American political climate between 1876 and 1896? A. The influence of the president over Congress diminished? [B.] The party that won the presidential election also controlled Congress? C. Southern states tended to vote Republican? D. ...
*October 29, 2011*

**science**

Humans are constantly innovating ways to produce and consume material resources.Give specific examples of at least two (2) production and two (2) consumption habits humans have related to material resources.
*October 27, 2011*

**physics**

A 1.2 kg ball is rolling down a friction free ramp at 21 m/s just before it hits level ground. How high was the ball when it started rolling?
*October 26, 2011*

**physics**

A 1.2 kg ball is rolling down a friction free ramp at 21 m/s just before it hits level ground. How high was the ball when it started rolling?
*October 26, 2011*

**Math**

Please help me with this problem 3(square root of 144 -6)
*October 26, 2011*

**math **

in a recent poll of 1,800 adults only 25% of the population approves of the president's performance. how many total people approve and how many total people disapprove of the president's performance? please help!
*October 22, 2011*

**Psychology**

If a negative correlation between two sets of scores is displayed as a scatterplot, the points are clustered in a pattern that Question 5 options: resembles a bell-shaped curve. extends from the lower left to the upper right of the plot. resembles a U-shaped curve. extends ...
*October 20, 2011*

**Physics**

For do I multiply 1/2 x10=5x10=50? SOrry for asking a easy question. I'm not smart.
*October 20, 2011*

**Physics**

1 C 2.D 3.B
*October 20, 2011*

**Physics**

Multiple choice please help. How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s? a. 100 J. b. 50 J. c. 10 J. d. 5 J. The airbag in a car works in a collision by . . . a. increasing the time of the impact to the person. b. reducing the impulse to the ...
*October 20, 2011*

**Physics**

How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s? a. 100 J. b. 50 J. c. 10 J. d. 5 J.
*October 19, 2011*

**Physics**

Multiple choice. The airbag in a car works in a collision by . . . a. increasing the time of the impact to the person. b. reducing the impulse to the person. c. reducing the momentum of the person. d. increasing the force on the person. A cannonball shot from a cannon with a ...
*October 19, 2011*

**English**

is it okay if you can tell me which part?
*October 18, 2011*

**English**

I need help if the sentence are good and i'm not sure with the underlining. Make up a sentece that contains an adjective cluase, and underline the adjective clause. Sentence #1: Celery, which people often leave uneaten, is very nutritous. Make up a sentece that contains an...
*October 18, 2011*

**Math/Economics**

$66
*October 18, 2011*

**trig**

if x=4 tan theta, express cos(2 theta) as a function of x
*October 17, 2011*

**organic chem **

IDK THAT QUESTION BUT I THINK THE ANSWER IS 165.8
*October 16, 2011*