Friday
August 29, 2014

Posts by Sarah


Total # Posts: 3,839

chemistry
How many grams of hydrogen can be prepared by treating 2.63 g of iron with 130.0 mL of 1.50 M sulfuric acid solution, to give iron(III) sulfate and hydrogen?
September 30, 2012

physics
According to Kepler's third law, the orbital period T of a planet is related to the radius R of its orbit by T2 R3. A planet's orbit is larger than Earth's by a factor if 3.39. What is the planet's orbital period?
September 30, 2012

math
A jar has eight red, nine blue, and ten green marbles. What is the least number of marbles that you can remove from the jar and be certain that you have three of the same color?
September 30, 2012

physics
Less than 215
September 29, 2012

Physics
A jet plane is cruising at 225.0m/s when suddenly the pilot turns the engines up to full throttle. After travelling 2.26km, the jet is moving with a speed of 392.0m/s. What is the jet's acceleration, assuming it to be a constant acceleration?
September 29, 2012

Physics
Larry leaves home at 2:08 and runs at a constant speed to the lamppost. He reaches the lamppost at 2:12, immediately turns, and runs to the tree. Larry arrives at the tree at 2:28. What is Larry's average velocity during his trip from home to the lamppost, if the lamppost ...
September 29, 2012

Chemistry Pretest
Last and final question: Consider the reaction 2KNO3 + 10K ---> 6K2O + N2. If 155 grams of K reacted with 122 grams of KNO3, what is the limiting reagent? a) KNO3 b) K c) Neither d) not enough information I would think it's d? Because it doesn't ask to know either ...
September 28, 2012

Chemistry Pretest
Fe can be prepared as 2 Al + Fe2O3 ----> 2 Fe + Al2O3. Suppose that 0.450 moles of Fe2O3 are reacted with an excess of Al. Suppose that 43.6 grams of Fe are obtained. What is the percent yield of Fe? a) 16.2% b) 60.7% c) 86.7% d) 43.4% Percent yield= actual yield of product...
September 28, 2012

Chemistry Pretest
Consider the following balanced equation. 2 H2 + O2 ---> 2 H2O Which of the following statements is false? a) One molecule of O2 will react with 2 molecules of H2 b) One mole of O2 will react with 2 moles of H2 c) The complete reaction of 32.0 g of O2 will produce 2 moles ...
September 28, 2012

Chemistry Pretest
11. How many moles of CO2 would be produced from 56 moles of O2 according to the following balanced equation? 2 C2H6 + 7 O2 ---> 4 CO2 = 6 H20 a) 16 b) 32 c) 224 d) 48 e) 8
September 28, 2012

Chemistry Pretest
1. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W, atomic number= 74)? **Formula mass of FeWO4 is 303.69** a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4
September 28, 2012

Spanish
It depends on the region, but in Spain, they usually add "-ito"
September 27, 2012

math
Im not sure I understand your question
September 27, 2012

AP World History
What was the status of women during the Gupta Empire? Describe India's Political nature prior to 400 BCE.
September 27, 2012

psychology
It's B
September 27, 2012

Biology
Internal stimuli is when you feel something like, hunger, pain, sleepy, etc. External stimuli is usually what you do in response to the internal stimuli. Ex. You fell and now your head is pounding (internal stimuli), so you go take some medicine (external stimuli). So in the ...
September 27, 2012

education
D behaviorism the second one is B
September 27, 2012

phycology
yes
September 27, 2012

Physics
You are driving to the grocery store at 11.9m/s. You are 169.0m from an intersection when the traffic light turns red. Assume that your reaction time is 0.730s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply ...
September 26, 2012

Calculus
Use derivative formulas to find the derivative of the function. please show your work h(x)=10^3-25x^6+3x^15
September 25, 2012

physics
When a car is traveling at 21 m/s on level ground, the stopping distance is found to be 18 m. This distance is measured by pushing hard on the brakes so that the wheels skid on the pavement. The same car is driving at the same speed down an incline that makes an angle of 7.6&...
September 25, 2012

geometry
what is (6x^2-8x+8) divided (x-3)? i have done this problem about 20 times literally and can not get the right answer. i would also like to know if i'm suppose to use place holders on any number with and X or just X^2?
September 25, 2012

Chemistry Check
A thermocouple was calibrated to give Celsius temperature. In the ice bath the voltage reading was 0.250 V, and in boiling water at 736 Torr the reading was 1.20 V. Derive the conversion equation between Volts and temp. C. So if I'm working this right, it should go like ...
September 24, 2012

chemistry
The watt is the derived SI unit of power, the measure of energy per unit time: 1 W = 1 J/s. A semiconductor laser in a CD player has an output wavelength of 780 nm and a power level of 0.10 mW. How many photons strike the CD surface during the playing of a CD 38 minutes in ...
September 23, 2012

Chemistry
You weigh out 1.60 g of sodium carbonate monohydrate, dissolve it in water and react it with 15.00 mL of 2.00 M HCl. Write an equation for the reaction and calculate the expected mass or carbon dioxide that will be produced. Your answer should be a decimal number to 3 decimal ...
September 23, 2012

Chemistry
An ordinary mercury-in-glass thermometer is calibrated. In the ice water bath, the mercury level is 2.45 cm above the bulb. In boiling water at 1.00 atm pressure the mercury level is 17.75 cm above the bulb. What is the Celsius temperature when the level in 12.70 cm above the ...
September 23, 2012

algebra
A mechanic is working on a car that has a 10 Liter radiator that is currently filled with a mixture of water and antifreeze. thirty percent of the 10 liters is antifreeze and the rest is water. how much needs to be drained and replaced with pure antifreeze to make 10 liters of...
September 22, 2012

ASAP MATH!
A paper carrier rides a bicycle to deliver newspapers on his route.He averages 5 miles per hour during his route.At that rate,how long would it take him to deliver papers to a street that is 680 yards long?Round the answer to the nearest tenth of a minute.
September 20, 2012

Math help ASAP!
Thanks
September 20, 2012

Math help ASAP!
A truck has a maximum-load rating of 5 tons.It is going to be loaded with machine parts that each weigh 66 pounds 9 ounces.How many of the machine parts can be loaded into the truck without exceeding its maximum-load rating?
September 20, 2012

Conditional Probability
A box contains 1 green ball, 2 blue balls, and 3 red balls. These balls are selected at random, one after another without replacement, and their colors are noted. Find the conditional probability that the third ball is red given exactly one ball is red.
September 20, 2012

Math
Thanks.(:
September 19, 2012

Math
The distance to fly direct from Detroit to Los Angeles is about 1,960 miles.The flight takes 4 hours 53 minutes.What is the plane's average speed in feet per second to the nearest foot per second?
September 19, 2012

Math
A camp cook found a recipe for scones that makes 18 scones. The recipe calls for 3 cups of buttermilk in the dough plus 2 fluid ounces of buttermilk to brush on top of the scones.The cook is out of buttermilk.How many quart containers of buttermilk does the cook need to buy to...
September 19, 2012

algebra
The problem is to factor and solve the following where G = 78 G = X2 - 5X + 6 ___________ 2
September 19, 2012

Math
Aidan is 5 feet 6 inches tall,and Belinda is 5 feet 5 inches tall. Aidan lies down on the sideline of a football field with his heels touching the goal line.Then Belinda lies down on the sideline with her heels touching the top of Aidan's head.They continue to take turns ...
September 18, 2012

Math
Convert 2,640 feet per hour to miles per hour (mph) A) 5 mph B) 0.05 mph C)18 mph D) 0.5 mph
September 18, 2012

math
determine where grouping symbols should be placed so that the value of the expression shown below is 4. Justify your answer. 40-28/4+3*9
September 18, 2012

Math
Okay need some help! It's probably easier than I think(: Katie made a drink out of 3 gallons of juice and 9 quarts of club soda. How many 6-ounce glasses can she fill completely with the drink? A) 80 B) 112 C) 96 D) 384 Thanks.(: -Sarah
September 18, 2012

Algebra 2
how do you find the coordinates to the vertex of y=/x-14/+9 using the formula y=a/x-h/+k
September 18, 2012

math
Marissa plans to use 50 sheets of paper for a scrapbook. how much thicker will the scrapbook be if she uses heavyweight instead or lightweight paper? 100 sheets of lightweight in thickness is 3/10 in 100 sheets of heavyweight in thickness is 2/5 in.
September 17, 2012

social studies
Can you help me compare and contrast liberal vs. conservative ideologies. Also, I need to provide a social and political example argument for each.
September 16, 2012

physics
Suppose the water at the top of Niagara Falls has a horizontal speed of 2.36 m/s just before it cascades over the edge of the falls. At what vertical distance below the edge does the velocity vector of the water point downward at a 38.8 ° angle below the horizontal?
September 15, 2012

math
x^2 < x+12 in interval notation. Im not sure how to work with the x^2
September 13, 2012

honors physics
A car is traveling on an interstate highway: a) Can the car have a negative velocity and a positive acceleration at the same time? Explain. b) Can the car's velocity change signs while it is traveling with constant acceleration? Explain.
September 10, 2012

math
in a class of 18 students at school there are half as many girls as boys. How many girls are in the class? how many boys?
September 10, 2012

Anatomy
How do you put any of these prefixes in 5 sentence? thank you -bi -cardio -costo -equi -hemi -cyto -gastro -bucca -glossa -colo -gingiva -lympho -naso -tonsillo -tracheo -pulmo -neuro -oto -cysto -hyster -lapar -nephro -mono -non -para -osteo -para -quadri -poly -meno -mega -...
September 10, 2012

math
pencils come in packs of 20 for 2.79 if 18 8th graders and 19 7th graders need 4 pencils how much would it cost?
September 10, 2012

math
Rays AB and BC are perpendicular. Point D lies in the interior of angle ABC. If Angle ABD = 4r-7 and angle DCB = 8r+1, find angles ABC and DCB.
September 8, 2012

PHYSICS
A circular loop of flexible iron wire has an initial circumference of 168cm , but its circumference is decreasing at a constant rate of 15.0cm/s due to a tangential pull on the wire. The loop is in a constant uniform magnetic field of magnitude 1.00T , which is oriented ...
September 8, 2012

Theory to Practice
the answer is B hopping and skipping. :)
September 8, 2012

Socisl studies
How did moutain passes help settlers who were traveling to california?
September 6, 2012

math
Rationalize the denominator: y divided by (square root of 6 + square root of y)
September 6, 2012

physics
3
September 4, 2012

7th Grade Science
Hey! i got the same question too! but i needed to make a bubble map to have a comparison of both of them ^-^
September 4, 2012

social studies
what countries that wanted to populate the New World.
September 3, 2012

math
20+53=73
September 3, 2012

math
72 feet is 3/4 of the total (1/4=24}
September 3, 2012

statistics
A source in the Internal Revenue Service has stated that historically 90% of federal tax returns filed are free of arithmetic errors. A random sample of 25 returns are selected and checked carefully for arithmetic errors. Assuming independence, find the probability that a. all...
August 30, 2012

Math
Write using statement using absolute value notation a) The distance between y and -2 is greater than or equal to 4 b) Y is more than d units from C.
August 29, 2012

Physics
Let 580 nm light be incident normally on a diffraction grating for which d=3.00D=1050nm. a) how many order (principal maxima) are present ? b) if the grating is 1.80 cm wide, what is the full angular width of each principal maximum? I got the first part I just plugged into ...
August 29, 2012

Place value whole numbers
what is the sum of my digits is 13?
August 28, 2012

chemistry
A nickel is found to have a mass of 5.06 grams. Using unit analysis, show what the mass of this nickel is in ounces.
August 28, 2012

trig
prove that there exists no smallest possitive real number dose there exist a smallest positive rational number given a real number x, does there exist a smallest real y>x?
August 28, 2012

chemistry
How do you draw an orbital diagram for an element, for example, the element iron.
August 26, 2012

Physiology
Palpation of the left axillary region demonstrated palpable lymph nodes extending into the ipsilateral anterior thorax. ( Does ipsilateral refer to the axillary ( armpit), meaning the anterior thorax is on the same side as the axillary (left)? ( Must be simplified into simpler...
August 25, 2012

Physiology
The patient reports numbness and tingling in the left lumber area and pain in the contralateral femoral region. ( not sure how to rewrite statement into simpler terms)
August 25, 2012

PHYSICS
Two bulbs are connected in parallel across a source of emf EMF = 10.0V with a negligible internal resistance. One bulb has a resistance of 3.0 Omega , and the other is 2.5 Omega . A resistor R is connected in the circuit in series with the two bulbs. What is the current ...
August 23, 2012

PHYSICS
How do i solve this part: What is the current through each individual bulb? Let I1 be the current through the bulb of resistance 3.0 Omega and I2 the current through the bulb of resistance 2.5 Omega?
August 23, 2012

PHYSICS
Two bulbs are connected in parallel across a source of emf EMF = 10.0V with a negligible internal resistance. One bulb has a resistance of 3.0 Omega , and the other is 2.5 Omega . A resistor R is connected in the circuit in series with the two bulbs. What value of R should be ...
August 23, 2012

adv english
WHAT / HOW DO I ANNOTATE ????
August 22, 2012

algebra
Create an equation for cell phone plan:$30 for the first 500 minutes plus $.20 for each additional minute.
August 21, 2012

AlgebraII
A train goes from boston to new york averaging 40 km per hour and returns averaging 60 km per hour. What is the average speed(it is not 50 km per hour) for the round trip?
August 20, 2012

math
consider the following statement: if a circle with its center at the origin has a chord with slope m, the equation of the right bisector of the chord is y=mx. Is this statement true or false? explain
August 18, 2012

Math
FIve players played a scored board game. If the average ( arithmetic mean) of the scores of the five players was 21, and if each person had a positive integer score, what is the greatest score any one player could have obtained? a) 33 b) 50 c) 75 d) 94 e) 101 ( please explain ...
August 15, 2012

Math
Which of the following CANNOT be the average ( arithmetic mean) of four positive even integers? a) 1 b) 2 c) 6 d) 9 e) 17 ( please explain or show work. It will help me understand it better! Thanks)
August 15, 2012

health
Ashworth**^
August 11, 2012

Math
Point E is on side AB of rectangle ABCD. If the area of ABCD is 48, what is the area of triangle CDE?
August 9, 2012

Chemistry
It doesn't give me the Keq. The information in the question is the only information I am given.
August 9, 2012

Chemistry
After 4.00 mol of C2H4(g) and 2.50 mol of Br2 (g) are placed in a sealed 1.0L container, the reaction reaches equilibrium and is written following: C2H4(g) + Br2(g) -> C2H4Br2(g) ... Calculate the equilibrium concentrations of all three substances.
August 9, 2012

math
If the ratio of the area of equilateral triangle A to the area of equilateral triangle B is 100 to 25, then what is the ratio of their altitudes?
August 8, 2012

math
what is math
August 6, 2012

business Communication
1. should be D consider your work styles and other commitment
July 29, 2012

business Communication
1, Which of the following is NOT something a group should do when it plans a collaborative writing project? A. Divide the work ahead of time according to how the leader thinks it will best be done B. Make your analysis of the problem, the audience, and your purposes explicit ...
July 29, 2012

biochemistry
You have a 100 mMoles of A in the 10 ml reaction mixture which contains buffer and enzyme. The reaction is allowed to reach equilibrium at 25 o C and you measure the concentration of B as 10 mM. What is the delta Go' for the reaction in KJ.
July 25, 2012

Math
Ohh BTW this is due in tomorrow
July 24, 2012

Math
I don't understand this it says If the average of 6 numbers was 58, what could the 6 numbers be? That would take forever to work out. What is the easiest way to work that out
July 24, 2012

Math
Circle X has an area of 36pie, and a circle Y has an area of 18pie. What is the ratio of the circumference of X to the circumference of Y.
July 23, 2012

Math
If the length and the width of a rectangle are doubled, its area is increased by what percent?
July 23, 2012

Math
A piece of paper is cut into 25 equal parts that are similar in shape to the original. what is the perimeter of one of the small pieces divided by the perimeter of the original piece of paper?
July 23, 2012

Math
At a local pound, 40% of the animals sheltered are cats and 15% of the cats are black. If there are 30 black cats at the pound, how many animals are sheltered there?
July 23, 2012

earth
You are standing on a planet with a radius 10,000kilometers. It's mass is 10^26 kg. What is the planet's escape velocity from where your standing? Ignore rotation of the planet.
July 13, 2012

Economics
In which of the following situations would someone have to pay a gift tax? A. A relative dies and leaves you $13,000 in the will. B. Your cousin gives you a car worth $1,700. C. Your grandmother gives you $13,000 toward college. D. Your cousin gets a job paying $32,000 a year...
July 6, 2012

Math
If a dog can run 10ft in1/5 of a second how many feet can it run in 20 seconds
June 28, 2012

dressmaking
IN making a two-piece flared skirt,the amount of flare is limited by the A) length of the skirt B) type of fabric C) size of the figure D) tendency to sag I cant decide between A,C or D because it does mention that if more flare is wanted,allow greater length and width,but it ...
June 25, 2012

art101
what is neo classicism?
June 22, 2012

Physics
A bomb is dropped from a plane flying at 4000 meters. The plane is flying at 80 m/s. How far, in a horizontal direction, did the bomb hit the ground?
June 22, 2012

math
how do you solve 2(x-3)=14-x over 5 ?
June 20, 2012

Geometry
If the ladder extends to a length of 158 inches, what is the height of the house rounded to the nearest hundredth of an inch? Type the numeric answer only in the box below.
June 17, 2012

PHY - C of M
A 1100-kg cannon shoots a 31-kg shell at an angle of 25¡ above the horizontal and a speed of 520 m/s. What is the recoil velocity of the cannon? (Take the direction the cannon is firing to be the positive direction. Indicate the direction with the sign of your answer.)
June 16, 2012

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