Wednesday
May 6, 2015

Posts by Laura


Total # Posts: 1,067

algebra
Which graph represents the following system of equations? y = 3x + 3 y = –x – 3
December 21, 2012

7th grade science
sperm
December 12, 2012

Physics
When a metal pipe is cut into two pieces, the lowest resonance frequency in one piece is 244Hz and that for the other is 454Hz. What resonant frequency would have been produced by the original length of pipe? (Assume the speed of sound in air is 345 m/s) ^ I already got the ...
December 2, 2012

Chemistry
Suppose I put 1 billion bacteria in a 10 ml tube of saline, mix well, and label this tube A. Answer the following questions: 1. Take 1 ml from tube A and put it in an empty tube B. What is the concentration and number of bacteria in tube B?
November 27, 2012

Chemistry
Suppose I put 1 billion bacteria in a 10 ml tube of saline, mix well, and label this tube A. Answer the following questions: 1. Take 1 ml from tube A and put it in an empty tube B. What is the concentration and number of bacteria in tube B?
November 27, 2012

world history
Which of the following was not an innovation that came about due to militarization in the 1800s?
November 27, 2012

MATHS
how can you explain the steps and formula
November 20, 2012

MATHS
Differntiate sin(sinx) using the product rule
November 20, 2012

Math
Solve the equation: 125^r=5
November 14, 2012

Math
What is the inverse equation of f(x)=(x+2)/(x-1)?
November 14, 2012

Intergated chemistry/physics
Draw a setup containing 3 gears. For every turn of the input gear, you need the output gear to spin 9 times. The drawing doesn't have to be perfect, but make sure to label the input gear, the output gear, and the number of teeth on each gear. Please E-mail me the picture ...
October 31, 2012

physics
A 80 kg object slides at a 20 degree plane downward at 5m/s. An object 2 collides with object 1 by falling from 7 meter height and they stick together. Final speed of objects? I know the speeds would be the same. Would momentum equation work to solve this? The perfect ...
October 25, 2012

science
what are some interactions that can take place when a beam of light hits a glass tank and then enters the water
October 24, 2012

stats
Suppose a shipment of 500 machine parts contains 62 defective and 438 non-defective machine parts. From the shipment you take a random sample of 25. You are interested in the number of defective machine parts out of 25 trials and corresponding probabilities. When sampling with...
October 21, 2012

Calculus 2
how do I find the fluid force of a vertical semicircle that has been divided into three equal sectors of 60 degrees each. I know what the equation to find the fluid force for the whole semicircle is. but how do I find L(y) for each semicircle.
October 11, 2012

Intergated chemistry/physics
You are riding a 30 pound bicycle and you weigh 150 pounds. You are travelling at 20 miles per hour and fail to notice the 30 pound dog is in your path. If you transfer half of your momentum to this dog, what speed could he potentially reach?
October 4, 2012

Intergated chemistry/physics
Your teacher bumps into you in the hallway and knocks you down. After he apologizes, he asks you to figure out how fast he was going. By some magical coincidence, you just happened to be wearing a gauge that measured your mass to be 75 kilograms and your speed to be 25 miles ...
October 4, 2012

Intergated chemistry/physics
A 200 pound go-kart with a speed of 20 miles/hour collides with a 2nd go-kart (that was at rest) and causes it to move at a speed of 15 miles per hour. What is the mass of the 2nd cart if the first kart came to a stop upon collision?
October 4, 2012

Intergated chemistry/physics
A 10 pound bowling ball with a speed of 2.0 meters/second hits a 6 pound bowling ball. If the 10 pound bowling ball stops after the collision, what is the resulting speed of the 2nd ball in meters/second
October 4, 2012

Intergated chemistry/physics
A 200 man is running 3 miles per hour and collides with a 125 pound man. If the larger man transfers all of his momentum to the smaller man, will the smaller man travel slower, faster or at the same speed as the larger man?
October 4, 2012

Intergated chemistry/physics
What is the speed (in m/s) of an object that has a mass of 2.5 kilogram and a momentum of 1,000 kg m/s?
October 4, 2012

Intergated chemistry/physics
If a bowling ball is rolling at a speed of 1.5 meters/second and has a momentum of 10.0 kg m/s, what is the mass of the ball in kilograms?
October 4, 2012

Intergated chemistry/physics
Which has more momentum: a 45 gram golf ball travelling at 180 miles per hour or a 430 gram soccer ball travelling at 20 miles per hour?
October 4, 2012

Intergated chemistry/physics
What is the momentum of a 100 kilogram football player moving with a speed of 3.5 meters/second. The units should be written as kg m/s.
October 4, 2012

Intergated chemistry/physics
If you were in a car traveling 50 miles/hours, how many miles could you travel if you continued for 15 hours without stopping?
October 3, 2012

Intergated chemistry/physics
If you were in a car travelling at 50 miles/hour, how many hours would it take to get to Miami, FL from Evansville, IN? Assume that there is no stopping on the way. Miami is 1,060 miles from Evansville.
October 3, 2012

Intergated chemistry/physics
If the elevator were falling on the moon 9800 meters/second^2, what would the force be? (hint: you will need to look up the acceleration due to gravity on the moon.)
October 3, 2012

Intergated chemistry/physics
The Lamborghini Diablo sports car can accelerate from 0 kilometers/hour to 99.2 kilometers/hour in 4.0 seconds. What is the acceleration of this car in kilometers/hour^2. (hint: you must convert 4.0 seconds before putting it into the equation.)
October 3, 2012

Intergated chemistry/physics
A car is accelerated at a rate of 2.5 meters/second^2. If the starting speed is 5.0 meters/second, how many seconds will it take the car to reach a final speed of 27.0 meters/second?
October 3, 2012

Intergated chemistry/physics
A parachute on a dragster racing-car opens and changes the speed of a car from 85 meters/second to 45 meters/second. Of this car is decelerating (slowing down) at a rate of -8.9 meters/ second, how many seconds will this take?
October 3, 2012

Physics
A boat, having an initial velocity of 6.6m/s east undergoes an average acceleration of 2.2 m/s squared south for 2.5 s. Determine final velocity after the time interval (magnitute and direction)
September 30, 2012

AP physics
A particle moving uniformly along the x axis is located at 17.9 m at 1.45 s and at 3.9 m at 2.7 s. Find its displacement during this time in- terval. Answer in units of m What is the average velocity speed during this time interval. Answer in units of m/s
September 30, 2012

Calculus 2
Calculus. Mary designed a new viewing window consisting of a rectangle and a semi circle for a fresh water aquarium. The window is as follows and the top is located 10 feet below the water's surface. How much force is on the window?
September 27, 2012

Calculus 2
Calculus 2. Tom and Mike have a bet as to who will do the most work today. Mike has to compress a coil 200 feet. It takes Mike 250 lbs to compress the coil 10 feet. Tom needs to pump water through the top of a cylindrical tank sitting on the ground. The tank is half full, has ...
September 27, 2012

Calculus 2
Calculus work problem. John bought the following corner lot. Two sides are bounded by 2 roads the back is bounded by a stream that follows the curve y = -x^3 + 8. He wants to build a house in the center of the lot. Where will that be? Please show all work
September 27, 2012

maths
Daniel has a rabbit, a ferret, a gerbil, and a turtle. He feeds them in a different order each day. in how many different orders can Kelvin feed his pets?
September 26, 2012

math
jade and isis are designing a soccer uniform they want use two colors on the shirt, their choices are green , orange, yellow, purple, blue silver. how many ways can they choose two colors?
September 26, 2012

Math
A function that represents the volume of a cardboard box is V(x) = -0.65x^3 + 4x^2 + 3x, where x is the width of the box. Determine the width that will maximize the volume. What are the restrictions on the width? The answer is 4.45 and domain is 0<x<6.83
September 25, 2012

Advanced Functions
Two soccer players start at opposite sides of an 80-m field. One runs at 4 m/s and the other runs at 5 m/s. If they run back and forth for 15 mins, how many times will they pass each other? **The answer is 25 but I keep getting 45!!
September 25, 2012

physics 101
A person in an elevator is holding a 15 kg block by a cord rated to withstand a tension of 180 N. When the elevator starts up, the cord breaks. What was the magnitude of the minimum acceleration of the elevator?
September 22, 2012

Physics
A person climbs from a Paris metro station to the street level by walking up a stalled escalator in 96.5 s. It takes 60.0 s to ride the same distance when standing on the escalator when it is operating normally. How long would it take for him to climb from the station to the ...
September 21, 2012

Physics
A ball is thrown from a point 1.38 m above the ground. The initial velocity is 19.9 m/s at an angle of 33.8° above the horizontal. Find the maximum height of the ball above the ground. Calculate the speed of the ball at the highest point in the trajectory.
September 21, 2012

Science
pH of: 2.50mL of 0.100M nitric acid added to 30mL of 0.200M potassium hydroxide Please show me working out :)
September 20, 2012

Algebra
What is the square root of -25? Can you please write out the steps of finding it?
September 13, 2012

chemistry
Okay thank you for the explanation. For soduim sulfide(NaS), will it form 3 particles in solution? Na+1 and S-2 so would that give you 3? For future reference, for these problems should i first see what type of bond it creates, then if it dissolves in water to get my answer?
September 12, 2012

chemistry
how many "particles in solution" will form from each sucrose (C12H22O11) molecule added to water? Explain. I don't understand where I am supposed to start... What do I need to know to do this problem? thank you
September 12, 2012

physics
A pilot is required to fly directly from london, united kingdom to rome, italy in 3.4 hours the displacement is 1.4 x 10 ^3km [s 43 e]. the wind wind velocity reported from the ground is 55km/h [s]. determine the required velocity of the plane relative to the air
September 10, 2012

MATH
x/2 + 11 = -25 x/4 - 5 + 13
September 6, 2012

math8th
28a^11b^7 divided by 4a^3b^2
September 5, 2012

English
I am writing an essay about James Baldwin's Go Tell It on the Mountain, but the essay prompt asks me to disagree or agree with the interpretation of an critical essay we read about this book. For my essay, do I state whether I agree with the article and then use other ...
August 31, 2012

math
The teacher gave nothing and that doesn't answer my question.
August 14, 2012

math
My son is in Kindergarten and I have no idea about the "Counters" in the question: 1st) Cover the teddy bears in the top row with different-color teddy bear counters. 2nd) Color the teddy bears in the bottom row to show the colors." Help. Thanks You.
August 14, 2012

Algebra
-2(t-7)-(t+8)=8
August 5, 2012

Math - Probability
You invent a new system to make excellent racing tires for the Indianapolis 500/ Your tires are good for an average of 105 miles, with a standard deviation of 7.5 miles. What is the probability that one of your tires can go for at least 44 laps? What is the probability that ...
July 9, 2012

math
0.6 of Emily's money is €42.How much has she?
June 18, 2012

chemistry
Ok I got it. I got the correct answer. Thank you so much for explain how to start and for your help.
June 16, 2012

chemistry
My professor never teach us this kind of question before. I don't know why she put this question as a homework since she doesn't teach us this yet. I need help with one question. I don't know where to start. So don't you mind if you can help me please. Here a ...
June 16, 2012

chemistry
Yea, I realized that HH is more easy and faster. I'm going use HH better instead other way. Anyway thank you so much for explain.
June 14, 2012

chemistry
How did you get the 3.94E-10?
June 14, 2012

chemistry
No, my professor didn't teach student on Henderson-Hasselbalch equation. My professor only show us the Henderson-Hasselblach forumla but not show how to use it. Also she didn't give us what is pKa for this problem. Anyway, thank you so much for your help.
June 14, 2012

chemistry
This question I really don't get it. I tried tried tried to figure out how to start solve the problem but still couldn't figure out. So can you help me with one question PLEASE? If so, can you please explain to me how you get the answer? Also can you show me step by ...
June 14, 2012

Business
According to the doctrine of supply , the amount________ will increase as the _________decreases. I'm stuck on this question. I can't seem to find it in my text book
June 12, 2012

Calculus AB...I really need help
The region in the first quadrant enclosed by the coordinates axes, the line x=pi, and the curve y= cos(cosx) is rotated about the x-axis. What is the volume of the solid generated.
May 28, 2012

algebra
12/5+8/13 the denominators have to equal the same so you mult. 5 times 13 and 13 times 5 and the numerators too 156/65+40/65=196/65
May 28, 2012

Calculus AB
The average value of a continuous function f(x) on the closed interval [3,7] is 12. Whats the value of ∫ from [3,7] f(x) dx?
May 28, 2012

Business
In a ____________, consumers ultimately decide what should be produced
May 25, 2012

physics
For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?
May 22, 2012

TRIG
I need to state the period and 2 consecutive asymptotes on the graph for the following questions. 1: y = -3 tan pi*x period: pi (?) asymptotes: ? 2: y = 2 sec 4x period: ? asymptotes: ? 3: y = csc (x/3) period: ? asymptotes: ? 4: y = 3 cot (pi*x/2) period: ? asymptotes: ?
May 21, 2012

Math- Trigonometry
The point, in on the terminal side of an angle in standard position find the exact value of the six trigonometric functions of the angle a. (8,15) b.(-9,-40)
May 20, 2012

health
Your health care organization has called upon you to lead a work team to identify service-quality problems within the environment. Individual Portion Answer the following questions about work teams: •What are the benefits of a strong work team? •What are the common ...
May 6, 2012

Chemistry 1201
2.3
April 15, 2012

precal
A cell phone company’s profit is modeled by the function p(x) = 10x − x2 − 1, where p is expressed in thousands of dollars and x is the number of phones sold in hundreds. How many phones must the company sell to make a profit of more than $15,000?
April 13, 2012

chemistry
so i just multiply everything?
April 13, 2012

chemistry
a 5.0 g sample of ice was heated from -20.0 degrees C o 0 degrees C and remained solid. the specific heat of ice is 2.1 j/gC. How much heat did the ice absorb?
April 13, 2012

geometry
what shape is 2 units wide and 5 units long?
April 7, 2012

Trig Help Please!!!
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
April 5, 2012

statistics
If the grades on a police entrance exam are normally distributed with a mean of 100 and a standard deviation of 15, what percentage of students received grades of less than 115?
April 1, 2012

Math
write an equation of a cosine function with Amplitude=1/2, Period=6pi, and Phase Shift=pi/3?
March 29, 2012

science
1. Two dogs are fighting over a 0.5 kg bone. The larger dog pulls on the bone in one direction with a force of 40 N. The smaller dog pulls in the opposite direction with a force of 36 N. What is the net force on the bone?
March 29, 2012

business
I just need an example, something to get me thinking in the right direction.
March 24, 2012

Math
Ok same problem too from 2015 sorry
March 22, 2012

math
find a to the nearest tenth if a= 36 degrees and c=113.5
March 16, 2012

chemistry
Mr=112.11 and 0.146mg/mL how do I change thiss to mmol/L
March 15, 2012

Math
Two numbers have a product of 3 1/5 and a sum of 3 3/5. One of the numbers is a whole number. Find the numbers.
March 14, 2012

physics
Why is there always a difference between the experimentally calcuated error for resistance, and the actual components tolerance value?
February 15, 2012

Physics
The drawing shows two fully charged capacitors (C1 = 7 µF, q1 = 4 µC; C2 = 16 µF, q2 = 4 µC). The switch is closed, and charge flows until equilibrium is reestablished (i.e., until both capacitors have the same voltage across their plates). Find the ...
February 14, 2012

physics
Assuming that it takes 0.10 s for the driver to react before applying the brakes, what is the stopping distance (the distance from the point where the driver first sees the need to stop to the point where the car comes to a stop) for a car traveling at 25 m/s if the ...
February 13, 2012

chemistry
Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
February 12, 2012

chemistry
Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
February 12, 2012

chemistry
Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
February 12, 2012

chemistry
Explain how you would prepare this solution from powdered reagents and whatever glassware you needed: 3.0 L of 1.3 M NaOH
February 12, 2012

Statistics
You have a fair die. The die has a 2 on two sides, a 4 on two sides and a 6 on two sides. Note: the only possible outcomes for each roll are 2, 4 or 6. (a) Draw a tree diagram that shows the possible outcomes of rolling the die twice (my answer Roll 1: 2, 4, 6 Roll 2: 2,4,6 ...
February 11, 2012

Statistics
A bucket has 3 blacks and 7 red balls. (a) What is the probability of drawing a black fall on the first draw? (my answer - 3/10 x 100 = 30%) (b) What is the probability of drawing a red ball on the 2nd draw if you replace the black ball you drew on the first draw? (my answer...
February 11, 2012

International Business
Jack-in-the-Box and McDonald's it is! Thank you! =)
February 9, 2012

International Business
I need to compare and contrast quality management at two organizations in the same industry. One organization must compete in the domestic market and one in the global market. Could you please give me some ideas on two organizations that fall within that criteria? Thank you
February 9, 2012

chemistry
You have 20.00 mL of a 0.1M aqueous solution of the weak base (CH3)3N (Kb = 7.4x10^-5). This solution will be titrated with 0.100 M HCl. How do you find the pH of this solution before any acid has been added.
February 9, 2012

chemistry
You have 20 mL of a 0.1 M aquesous solution of the weak base (CH3)3N (Kb = 7.4x10^-5). This solution will be titrated with 0.1 M HCl. how many mL of acid must be added to reach the equivalence point?
February 8, 2012

Chemistry
you have 20 ml of 0.1 M aqueous solution of the weak base (CH3)N (Kb = 7.4 x 10^-5). This solution will be titrated with 0.1 M HCl. how many ml of acid must be added to reach the equivalence point?
February 8, 2012

astronomi
one astronomical units is about 1.5 X 10 km .
February 8, 2012

math
It takes approximately 15 minutes to code one record. How many personnel hours would be needed to code 1,424 discharges for the month?
February 7, 2012

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