Thursday
September 18, 2014

Posts by Sarah


Total # Posts: 3,878

Physics
A(n) 95.7 kg boxer has his first match in the Canal Zone with gravitational acceler-ation 9.782 m/s2 and his second match at the North Pole with gravitational accelera- tion 9.832 m/s2.
October 30, 2012

Computer Science
public class RandomPhoneNumber { public static void main(String[] args) { int num1=(int)(Math.random()*7); int num2=(int)(Math.random()*7); int num3=(int)(Math.random()*7); int set1=(int)(100+Math.random()*642); int set2=(int)(1000+Math.random()*8000); System.out.println("...
October 30, 2012

Physics- Elena please help!
Assume you are agile enough to run across a horizontal surface at 11.60 m/s on an airless spherical asteroid of uniform density 1.0x103 kg/m3, independently of the value of the gravitational field. To launch yourself into orbit by running, what would be (a) the radius? (b) the...
October 29, 2012

Chemistry
a silver coin has a mass of 2.50g and is analysed for silver by dissolving in dilute nitric acid, and precipitating silver as solid AgCl and weighing this. if the percipitat weighs 2.99g what percentage of silver is the coin?
October 29, 2012

Geometry
Which statement about a figure ABCD would always be true ?
October 28, 2012

Organic Chemistry
I think I got something: there should be 2 Rf values, since there are two components; maybe the spot was not concentrated enough. So the way to fix the error would be to make the spot bigger. Is this right?
October 28, 2012

Organic Chemistry
Identify the error in the following scenario and indicate how you would fix the error: A TLC of a two component mixture of pentene and 1,3-diethylbenzene was run in acetone. An Rf value of 0.90 was reported.
October 28, 2012

CHEMISTRY
Calculate the change in entropy that occurs when 17.68 g of ice at -12.7°C is placed in 54.05 g of water at 100.0°C in a perfectly insulated vessel. Assume that the molar heat capacities for H2O(s) and H2O(l) are 37.5 J K-1 mol-1 and 75.3 J K-1 mol-1, respectively, and...
October 23, 2012

math
A right triangle is formed in the first quadrant by the x- and y-axes and a line through the point (2,3). Draw a figure that illustrates the problem. What is the area of the triangle A as a function of the x-intercept of the line?
October 22, 2012

Physics help PLZ!!
Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider two cases: (a) the satellite is launched into an equatorial orbit from a point on the Earth’s equator, and (b) it is launched from the North ...
October 22, 2012

Algebra
thank you so much!!! 😄
October 20, 2012

Algebra
2-(3x-4)=2x-9 X=? help would be lovely 😊
October 20, 2012

arithmetic
$30.00 x .6/2-$17.50=
October 18, 2012

Force Physics
I don't know how to find the answer to the bottom scale yet; but I found the top scale by adding both the masses. Then times that number by 10, which is g.
October 18, 2012

science
The block of mass 4.44723 kg has an acceleration of 4.6 m/s^2 4.44723 kg F is at 30◦ a What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s 2 and the surface is frictionless. Answer in units of N
October 17, 2012

science
A 14700 kg sailboat experiences an eastward force of 29800 N due to tide pushing its hull while the wind pushes the sails with a force of 81500 N directed toward the northwest (45◦ westward of North or 45◦ northward of West). What is the magnitude of the resultant ...
October 17, 2012

Math
oh, okay. now I get it. thanks!!!
October 16, 2012

Math
this is confusing :( this is how I am solving. 66 2/3 12 ------- = ----- 100 W so i mulitiplyed 100x12= 2100. and from here I don't know how to insert 66 2/3 into calculator. 2100 divided by 66.667? the choice to answers are 14, 3.17, 315 and 31.5 I know for sure that 14 ...
October 16, 2012

Math
21 is (66 and 2/3)% of what number? I believe the answer is 14. is it right?
October 16, 2012

statistics
A group of 200 students takes the Kaplan course in hopes that it will improve their SAT scores above the national mean of 500 on the math section. The population standard deviation of the SAT is known to be 100. Use an alpha level of .05 when answering the following questions...
October 16, 2012

Physics
A 50kg object is moving at 25m/sec. How many calories are generated when the object brakes to a stop?
October 16, 2012

Physics
** TWO very small..
October 15, 2012

Physics
wo very small spheres are initially neutral and separated by a distance of 2.73 m. Suppose that 2.60E+13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere?
October 15, 2012

Physics
Aiyana drives for 100 s at a rate of 20m/s, then turns around and drives for another 200 s at a rate of 30m/s and completes the rest of her journey at a rate of 90m/s for 100 s. what is her average velocity?
October 14, 2012

Spanish
me estoy cepillando los dientes me estoy maquillando me estoy bano me estoy sacando la basura me estoy poniendo me estoy nerviosa
October 14, 2012

c++
Your Mathematic school teacher want to use a program that can read the name and the mark of a student. Your teacher want the program to automatically find the grade of the mark and display the result(name, mark and grade). Help your teacher to develop a program that can solve ...
October 11, 2012

CHEMISTRY
The enthalpy of neutralization for the reaction of a strong acid with a strong base is −56 kJ/mol of water produced. How much energy will be released when 200.5 mL of 0.400 M HCl is mixed with 149.1 mL of 0.500 M NaOH?
October 9, 2012

Chemistry
Integrate the expression β = 1/V (δV / δT) at constant pressure, assuming that β is independent of temperature. By doing so, obtain an expression for V as a function of T and β at constant P.
October 9, 2012

physics
A skier squats low and races down an 11◦ ski slope. During a 3 s interval, the skier accelerates at 2.7 m/s^2 . What is the horizontal component of the skier’s acceleration (perpendicular to the direction of free fall)? Answer in units of m/s^2.
October 8, 2012

physics
How long does it take a rocket to change its velocity by 57 m/s while accelerating at 53.7 m/s2? Round your answer to 2 decimal places.
October 8, 2012

world history
D. Something to be shared with conquered people.
October 6, 2012

math
what is the greatest zero of the function y=x^2-25+66
October 4, 2012

Math
Write the ratio in three different formats:a to b ,a : b , and a/b . Carlos biked 24 miles and ran 6 miles. Write the ratio of the distance Carlos biked to the total distance.
October 4, 2012

math
the frame for a shipping crate is to be constructed from 24 feet of 2 by 2 lumber. if the crate is to have square ends of side x feet, express the outer volume V as a function of x (disregard the thickness of the lumber)
October 3, 2012

Math
Six people are going to sit in a row on a bench. Romeo wasnts to sit next to Juliet. Caesar does not want to sit next to Brutus. Homer and Pierre can sit anywhere. In how many ways can these people be seated?
October 2, 2012

math
Abby takes 6 steps forward, then 2 steps back. If she repeats this pattern, how many steps will she be from where she started after 4 moves? After 5 moves?
October 2, 2012

The digits
0-9 are the building blocks for all numbers.what this means.
October 2, 2012

Math
Abby takes 6 steps forward, then 2 steps back. If she repeats this pattern, how many steps will she be from where she started after 4 moves? After 5 moves?
October 2, 2012

physics
Your groceries are in a bag with paper handles. The handles will tear off if a force greater than 58.4 N is applied to them. What is the greatest mass of groceries that can be lifted safely with this bag, given that the bag is raised (a) with constant speed, or (b) with an ...
October 2, 2012

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

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