Thursday

September 18, 2014

September 18, 2014

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*

**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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