Saturday

March 28, 2015

March 28, 2015

Total # Posts: 2,436

**Physics**

Two forces, 1 and 2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 58.0 N and F2 = 26.5 N. What is the horizontal acceleration (magnitude and direction) of the block?
*June 27, 2012*

**Physics**

The 1994 Winter Olympics included the aerials competition in skiing. In this event skiers speed down a ramp that slopes sharply upward at the end. The sharp upward slope launches them into the air, where they perform acrobatic maneuvers. In the women's competition, the end...
*June 27, 2012*

**Physics**

In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 36 m/s (around 80 mi/h) in a time of 5.5 s. The mass of the car and riders is 4900 kg. Find the average net force exerted on the car and riders by the ...
*June 26, 2012*

**Physics**

A person with a black belt in karate has a fist that has a mass of 0.70 kg. Starting from rest, this fist attains a velocity of 6.9 m/s in 0.15 s. What is the magnitude of the average net force applied to the fist to achieve this level of performance?
*June 26, 2012*

**Physics**

Could someone explain how to do this?
*June 22, 2012*

**Physics!!!**

A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through ...
*June 22, 2012*

**Physics**

A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through ...
*June 21, 2012*

**math**

diving 12 and56
*June 16, 2012*

**Geometry**

The math club of Ritzy High designed a pennant for the school yacht. The pennant was in the shape of an isosceles triangle. Two points, P and Q, are located so that AC= PQ= QB. Find the measure of angle B.
*June 9, 2012*

**Physics**

How are you getting -44 mph for the final velocity?
*June 6, 2012*

**Physics**

How fast would a 9-g fly have to be traveling to slow a 1790-kg car traveling at 58 mph by 4 mph if the fly hit the car in a totally inelastic head-on collision?
*June 6, 2012*

**math**

create a situation that can be modelled by this linear system, then write a related problem. 10x + 5y = 850 x - y = 10
*June 3, 2012*

**math**

26 math words
*May 31, 2012*

**math**

26 math words
*May 31, 2012*

**physics**

A spherical mirror has a focal length of −0.59 m. An object of height 0.045 m is located 0.42 m in front of the mirror. What is the height (including its sign) of the object’s image?
*May 29, 2012*

**Precalculus**

What are the exact values for which tan t = -(sqrt3)
*May 23, 2012*

**chemistry**

3CaCO3+2FePO4-->Ca3(PO4)2+Fe2(CO3)3 We start with 100g. of calcium carbonate and 45g. iron (III) phosphate. What is the maximum amount of Ca3(PO4)2 and Fe2(CO3)3 ??
*May 14, 2012*

**Physics**

A 1.4 kg mass is attached to a spring with a force constant of 56 N/m. If the mass is released with a speed of 0.26 m/s at a distance of 8.6 cm from the equilibrium position of the spring, what is its speed when it is halfway to the equilibrium position?
*May 14, 2012*

**Chemistry**

A bond between two sugar molecules is formed by which of the following types of reactions? oxidation-reduction condensation single-replacement double-replacement
*May 10, 2012*

**Chemistry**

What can you say about the energy spread of the radiation emitted by an atomic gas?
*May 8, 2012*

**Chemistry**

Based on the spectrum of the fluorescent lamp, what is the main difference between the radiation emitted by a heated solid (filament) and the radiation emitted by an atomic gas (mercury gas in the fluorescent tube)?
*May 8, 2012*

**Chemistry**

Thank you SO much!
*May 8, 2012*

**Chemistry**

1. Describe the relationship between the color change of the filament with temperature, and the colors in the observed spectrum of white light. 2. Order the colors of the rainbow according to the amount of energy needed to produce them, from lowest to highest.
*May 8, 2012*

**Calc III**

Find the position vector of a particle that has the given acceleration and the specified initial velocity and position. a(t)= 56t i + sin(t) j + cos(2t) k v(0)= i r(0)= j I need help finding r(t) Thanks so much for your help!!
*May 4, 2012*

**visual and performing arts**

Explain why the Chartres Cathedral both is and isn't an example of the "High Gothic" style. Be sure to reference specific pieces of art in your response.
*May 3, 2012*

**visual and performing arts**

well i think its pythagoros or socrates but im not sure.
*May 3, 2012*

**visual and performing arts**

From what Greek philosopher did Abbot Suger draw inspiration? .Aristotle .Socrates .Pythagoros .Pseudo-Dyonysius
*May 3, 2012*

**performing and visual arts**

im not at all sure about this one.
*May 3, 2012*

**performing and visual arts**

What is another name for Gherardo Starnina? .Master of Bambino Vespo .Gentile da Fabriano .Duccio Buoninsegna .Giotto Bondone
*May 3, 2012*

**Chemistry**

A 55.0-mg sample of Al(OH)3 is reacted with 0.200M HCl. How many milliters of the acid are needed to neutralize the Al(OH)3.
*May 1, 2012*

**Chemistry**

What is the molarity of a sodium hydroxide solution if 38 mL of the solution is titrated to the end point with 14 mL of 0.75M sulfuric acid?
*May 1, 2012*

**Chemistry**

What is the molarity of a sodium hydroxide solution if 38 mL of the solution is titrated to the end point with 14 mL of 0.75M sulfuric acid?
*May 1, 2012*

**statistics**

if the null hypothesis is that the mean is 3218, the alternative hypothesis is that the mean > 3228, and the sample mean is x= 3342, the sample standard deviation is s=287, the sample size is n= 42, and α= 0.01 a. calculate the z test statistic. b. what is the p-value...
*April 29, 2012*

**statistics**

do you want to own your won candy store? start up costs (units in 1,000) for a random sample of candy stores are: (95, 173, 129, 95, 75, 94, 116, 100, 85) Use an 80% confidence interval to test the null hypothesis that the mean start up cost is 118. Justify answer.
*April 29, 2012*

**statistics**

sorry, the question is above this link
*April 29, 2012*

**book report**

can someone show me how a third grade bokreport layout is done
*April 28, 2012*

**Consumer Math**

Find the annual amount of FICA at a 7.51% rate by computing his annual salary. Sam Takagi Weekly salary: $435.16 Not self-employed Find the annual amount of FICA by computing his annual salary. $169,938.68 $16,993.87 $1,699.39 2. Find the annual amount of FICA at a 7.51% rate...
*April 27, 2012*

**Chemistry**

A sample of ammonium salt (NH4X) having a mass of 1.618g was heated with NaOH and the liberated ammonia was reacted with 50.00 of .6230 mol/L HCl. The excess acid required 1.50 mL of .6115 mol/L NaOH in titration. What is the formula of the salt?
*April 25, 2012*

**College Chemistry**

I need help with this question!! a sample of pure KHP weighing .8097g dissolved in water and titrated with 40.25 mL of NaOH solution. The same NaOH solution was used to titrate a solution of a weak diprotic acid H2X. A sample of 0.18694g of the weak acid was first dissolved in...
*April 25, 2012*

**Visual & Performing Arts - Semester 1 Class**

unity
*April 24, 2012*

**Visual & Performing Arts - Semester 1 Class**

When all the portions of an artwork are combined and seem to function collaboratively, the composition is said to have?
*April 24, 2012*

**us history**

Who did the Santa Fe Trail get estblaished for?
*April 23, 2012*

**physics @ elena**

I saw that u aready did this, but when I calcuated everything my answers were still wrong
*April 22, 2012*

**physics @ elena**

can you please help me with this one At serve, a tennis player aims to hit the ball horizontally. part a)What minimum speed is required for the ball to clear the 0.90m--high net about 15.0m from the server if the ball is "launched" from a height of 2.50m ? part b)...
*April 22, 2012*

**physics**

An athlete executing a long jump leaves the ground at a 28.0 angle and lands 7.60m away. part a)What was the takeoff speed? part b) If this speed were increased by just 8.0 % , how much longer would the jump be? i got for part a)9.48 m/s but i need help with part b
*April 22, 2012*

**physics. HELP PLEASE !**

An athlete executing a long jump leaves the ground at a 28.0 angle and lands 7.60m away. part a)What was the takeoff speed? part b) If this speed were increased by just 8.0 % , how much longer would the jump be? i got for part a)9.48 m/s but i need help with part b
*April 22, 2012*

**Chemistry**

Which pair of compounds will form a solution? A) Benzene (C6H6) and Hexane (C6H14) B) Na2SO4 and Benzene C) NaCl and Hexane
*April 20, 2012*

**Economics**

Staples. They are likely to remain fixed, thus having an inelastic supply.
*April 19, 2012*

**Math 10 Linear Equations**

I got the same except for the last one. .5x=23 x=46
*April 19, 2012*

**Math 10 Linear Equations**

Kevin opened a bank account and plans to deposit $200 each month. Each time he makes a deposit, his parents have agreed to add 50% of the amount the family collects for returning cans and bottles. a) Write an equation that will show his monthly amount when the family collects ...
*April 19, 2012*

**Religion**

Youtube - The Maccabeats - Candlelight - Hanukkah Please watch the video above and tell me a piece of Catholic wisdom about a feast day or holiday in the Catholic church. Please please please please
*April 14, 2012*

**algebra2**

simplify fourth root sqrt 32x^11y^15/fourth root sqrt 2x^3y^-2
*April 14, 2012*

**cochise**

How many kilocal are required to increase the temperature of 15.6 g of iron from 122 °C to 355 °C? The specific heat of iron is 0.450 J/g °C
*April 13, 2012*

**Economics**

It's B. Sorry,
*April 12, 2012*

**Economics**

it's D.
*April 12, 2012*

**health**

Children and adolescents are considered to be reflected in which age group? A. 6-17 years old B. 3-17 years old C. 5-17 years old D. 10-17 years old
*April 11, 2012*

**chemistry**

The decomposition of potassium chlorate, KClO3, gives oxygen gas and solid potassium chloride. How many grams of KClO3 are needed to produce 5.00 L of Oxygen gas at STP? Suppose that the reaction described above produces 4.80 L of O2 in the laboratory. What is the percent yield?
*April 10, 2012*

**Physics**

in an impulse/ change in momentum problem where mv(final)-mv(initial)=Ft if the initial velocity is zero can i cancel out the masses?
*April 10, 2012*

**Chemistry**

how many joules of heat are given off when 5.0 grams of water cool from 75 degrees celsius to 25 degrees celsius? ( specific heat of water = 4.18 jg degrees celsius)
*April 9, 2012*

**Math**

write the particular equation of a quartic function that could, according to Descartes Rule of Signs have four positive zeros.
*April 9, 2012*

**physics**

You are trying to raise a bicycle wheel of mass m and radius R up over a curb of height h. To do this you apply a horizontal force F. What is the smallest magnitude of the force F that will succeed in raising the wheel onto the curb when the force is applied (a) at the center ...
*April 8, 2012*

**chemistry**

How does Le Chatelier's principle explain the result you obtained after the addition of NaOH?
*April 7, 2012*

**healthcare**

treat them as if they were someone who is the same age as you.
*April 7, 2012*

**Chemistry**

when 0.20 mole HF is dissolved in water to a volume of 1.00 L, 5.8% of the HF dissociates to form F- (aq). What is the equilibrium constant for the reaction ? HF(aq) +H2O(l) ------ F- (aq) +H3O+ (aq)
*April 5, 2012*

**trig**

cos(sin^-1 x)=sq rt(1-x^2) prove the identity
*April 2, 2012*

**trig**

Give the following for the function: y=2+cos(5x+3.14 Amplitude: Period: Phase Shift:
*April 1, 2012*

**Trig**

A 7.25 inch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
*April 1, 2012*

**MATH HELP**

At Jefferson College 15% of all students participate in athletics. If a class consists of 33 randomly selected students, how many of them would you expect to participate in athletics?
*April 1, 2012*

**Trig**

A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.
*April 1, 2012*

**Statistics**

At the Starlight Jewelry store, the customer preferences for wedding bands is 60% yellow gold, 29% white gold and 11% platinum. If 15 customers are randomly selected, what is the probability that more than 10 of them choose yellow gold wedding bands?
*April 1, 2012*

**Trig Circular Motion**

A es004-1.jpginch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.
*March 31, 2012*

**Trig**

A ferris wheel at the fair has a radius of 60 feet. If it takes 24 seconds to make a full revolution, what is the linear speed for the passengers?
*March 31, 2012*

**Chem 2**

Calculation in grams for a .100 M solution of NaC2H3O2 * 3H2O using a 100 mL volumetric flask?
*March 27, 2012*

**chemistry**

51.59 g of water at 82.6 oC is added to a calorimeter that contains 48.01 g of water at 40.9 oC. If the final temperature of the system is 59.4 oC, what is the calorimeter constant (Ccalorimeter) ? Use 4.184 J/goC for the heat capacity of water.
*March 26, 2012*

**chem**

How much energy (in Joules) is required to heat 13.48 g of water from 10.5 oC to 46.2 oC ? Use 4.184 J/goC as the specific heat capacity of water.
*March 26, 2012*

**Physics**

A mass of .27 kg is attached to a spring and is set into vibration with a period of .39s.what is the spring?
*March 24, 2012*

**Chemistry**

Solid ammonium nitrate can decompose to dinitrogen oxide gas and liquid water. What is delta G at 298K?
*March 23, 2012*

**Math**

If threr are a total of 20 students in Bibi's class, how many boys are in the class? How manygirls are in the class?
*March 15, 2012*

**math- Variance**

What does it mean when it says Variance of Stride Length with Speed?? Do you add the Variance of both individually together?
*March 14, 2012*

**math**

I feel as though I am missing something here...Suppose a family wants to have 3 children. Find the probability that the family has at least 1 boy. Help?
*March 13, 2012*

**math**

I feel as though I am missing something here...Suppose a family wants to have 3 children. Find the probability that the family has at least 1 boy. Help?
*March 13, 2012*

**Math**

I have the same exact question as this. But I don't understand your way of answering. Can you please help me with this?# of faces painted 3x3x3 4x4x4 5x5x5 4 3 2 1 0
*March 10, 2012*

**Social Studies**

Did the Emperor of Qon's efforts to unite China make him an effective ruler? Is the answer very ineffective or very effectve?
*March 8, 2012*

**Math**

I forget how do you do this problem? -y < -x-2
*March 7, 2012*

**physics**

A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure. The length of the arc ABC is 214 m, and the car completes the turn in 40.0 s (Figure shows coordinate plane with point A on -y axis point C on +x axis and point B ...
*March 6, 2012*

**Calculus I**

Show that the equation x^4 + 4x + c = 0 has at most two real roots. I believe we're supposed to prove this by proof of contradiction using Rolle's Theorem, but I'm not quite sure how to do this problem.
*March 5, 2012*

**algebra 2**

A pebble is tossed from the top of a cliff. The pebble's height in feet is given by y(t) = -16t2 + 6t + 200, where t is the time in seconds. Its horizontal distance in feet from the base of the cliff is given by d(t) = 5t. How far will the pebble be from the base of the ...
*March 5, 2012*

**Calculus I**

Sketch the graph of f by hand and use your sketch to find the absolute and local maximum and minimum values of f. 18. f(x) = 1/x , 1 < x < 3 I can graph it just fine, but for my answer I got that the function has none of the above. Is this correct?
*March 5, 2012*

**Algebra 2**

If there are initially 1500 bacteria in a culture, and the number of bacteria double each hour, the number of bacteria after t hours can be found using the formula N=1500(2^t). How many bacteria will present after 7 hours? I think the answer is N=192,000. Is this correct?
*March 1, 2012*

**math**

i need help doing these type problems.... example 3 1/3- 2 1/2=
*February 29, 2012*

**algebra**

To solve ax = b for x multiply both sides of the equation by?
*February 29, 2012*

**algebra**

Hi would you help me homework please?
*February 29, 2012*

**world history**

Analyze the changes in global commerce between 1750 and 1900 due to changes in technology, communication, and economic theory.
*February 26, 2012*

**math**

I have 432 cards that are three and a half inches long if I put them end to end how many feet long is the line of cards
*February 23, 2012*

**Calculus**

Ahh yes that was a typo! Thank you!!
*February 22, 2012*

**Calculus**

Find the derivative of y = ln |cos(ln)|. I got -tan(ln x)/x, is this correct?
*February 22, 2012*

**Physics**

if a force of 163 newtons is applied to the end of the jack handle the end moves down 15 cm. If lifting part of the jac raises the car bumper 1.75 cm what force is the jack exerting on the bumper
*February 17, 2012*

**College Chemistry**

How much Ca(OH)2 is required to remove 90.0% of PO4^-3 from 7.5 times 10^6 L of drinking water containing 25 mg/l of PO4^-3?
*February 17, 2012*

**Chemistry**

How many milliliters of .100 M HNO3 are needed to neutralize 58.5 mL of .0100 Al(0H)3?
*February 17, 2012*

**math**

If there are 75 animals in a pet store and a pie graph shows 16% are cats how many of the animals are cats
*February 14, 2012*

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