Sunday

April 19, 2015

April 19, 2015

Total # Posts: 1,151

**chemo**

How much heat (in kJ) does it take to melt 28.4 grams of ice at 0 °C and raise the temperature of the resulting water to 25 °C? Heat of fusion 334 J/g, Specific heat 4.184 J/g °C ?
*October 29, 2013*

**College probability and statistics**

The current license plates in New York State consist of three letters followed by four digits. ( i ) How many possible distinct license plates can there be? ( ii ) How many possible distinct license plates could there be if the letters O and I and the digits, 0 and 1 were ...
*October 12, 2013*

**physics**

Help please ! been stuck on this for hours. A model rocket blasts off and moves upward with an acceleration of 13m/s^2 until it reaches a height of 25m , at which point its engine shuts off and it continues its flight in free fall. 1) What is the maximum height attained by the...
*October 1, 2013*

**Social studies**

What company did parliament try to help with the tea act
*September 12, 2013*

**health**

D for both
*September 3, 2013*

**Math**

The regular admission price for an amusement park is $72. For a group of 15 or more, the admission price is reduced by $25. How many people need to be in a group to save $500? Need Answer step by step.
*September 3, 2013*

**math**

Sam bakes 10 trays of cookies using 8 cups of milk how many cups of milk does he use for each tray of cookies?
*August 27, 2013*

**math**

Seven friends share 3 liters of apple juice equally how much juice does each friend get?
*August 27, 2013*

**statistics**

The scores for standardized test are normally distributed with a mean of 300 and standard deviation of 39. If the test is given to 700 students, how many are expected to have scores between 300 and 378.
*July 25, 2013*

**Finance**

If upon retirement in 20 years Simon plans to invest $400,000 in a fund that earns 5%, what is the maximum annual withdrawal he can make over the following 15 years?
*July 22, 2013*

**math**

The answer to the maths question was: "age>21". Make up a question that could have this as an answer.
*July 20, 2013*

**math**

PsyDAG, The answer to the questions is 'age greater than', so you wouldn't say "the legal voting age is greater than 21." What other questions do you think you could create with 'age greater than' as the answer? Melissa
*July 20, 2013*

**math**

The answer to the maths question was: "age>21". Make up a question that could have this as an answer.
*July 20, 2013*

**History**

The creation of minority group status largely depends on: A. The nature of the contact situation B. The size of the dominant group C. Whether the dominant group is assimilationist or ...
*July 11, 2013*

**Alternative Sweeteners Help**

What is the relative difference in sweetness between sucrose and saccharin, tagatose, sucrolose, aspartame, neotame which is marketed as sweet n low, equal and nurtasweet, splenda?
*June 29, 2013*

**physics**

A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length scripted l = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ...
*June 3, 2013*

**math**

Make the equation 2x + 5x = 119 7x = 119 x = ? Times that number by 2 and 5 and you should get the two numbers
*May 28, 2013*

**Geometry Honors**

Can someone help me with Always, Sometimes, Never questions?? I have answered all of these, but I am not sure if they are right. 1. The base angle of an isosceles triangle are acute----Always 2. When the altitude and the median are drawn from the same vertex of a triangle, the...
*May 28, 2013*

**Geometry**

Can you help me with Always, Sometimes, Never questions?? I have answered all of these, but I am not sure if they are right. 1. The base angle of an isosceles triangle are acute----Always 2. When the altitude and the median are drawn from the same vertex of a triangle, the ...
*May 28, 2013*

**physics**

A square loop 23.5 on a side has a resistance of 2.80 . It is initially in a 0.575 magnetic field, with its plane perpendicular to , but is removed from the field in 35.0 .
*May 27, 2013*

**Chemistry**

A saturated solution of potassium nitrate in water is prepared at 70.0*C then cooled to 55.0*C how many grams of potassium nitrate crystallized--- how do I determine this using my graph with everyone's numbers
*May 8, 2013*

**math for business and finance**

What sinking fund payment would be required at the end of each three-month period, at 8% interest compounded quarterly, in order to amount to $20,000 within 5 years?
*April 29, 2013*

**english**

Some ancient and medieval works have several qualities present in novels. true or false.
*April 25, 2013*

**language arts & writing**

My apartment has 2 bedrooms. My apartment has 1 1/2 bathrooms. a)comma b)and c)or d)but e)because
*April 15, 2013*

**language arts & writing**

My apartment has 2 bedrooms. My apartment has 1 1/2 bathrooms. a)comma b)and c)or d)but e)because
*April 15, 2013*

**Help Please Stat-Math**

According to an airline, a particular flight is on time 75% of the time. Suppose 140 flights are randomly selected and the number of on time flights is recorded. Determine if you should use the Binomial model or Normal model to solve this problem. show work and write a ...
*April 13, 2013*

**Math-Stat Help **

In a random sample of 78 teenagers, 32 admit to texting while driving. Construct a 98% confidence interval for the percentage of teenager that text while driving. Start by showing that conditions for constructing a confidence interval are met. 1) Check conditions 2) confidence...
*April 11, 2013*

**algebra**

the local high school is setting up square-shaped lunch tables in the cafeteria. each table has an area of 12x^3-4x^2 square feet. if sqrt 3x+1 tables are put end to ed to form a banquet table, how long will the banquet table be? assume x>1/3 part 1: use theformula for area...
*April 10, 2013*

**math**

on a biology test a student answers 25 questions correct but doesnt pass. on second attempt he gets 37 correct. what is the percent of increase
*April 10, 2013*

**Math**

If Kelly gave 1/3 of a pizza to Holly and 1/5 to Diane how much did she have left?
*April 9, 2013*

**Venn Diagram Help Please**

If P(A)=.60, P(A/B)=.50, AND P(B)= .40, answer the following. draw a venn diagram for the probabilities of A and B.
*April 8, 2013*

**CHECK ANSWERS AND HELP PLEASE**

MATH-STAT
*April 8, 2013*

**CHECK ANSWERS AND HELP PLEASE**

if P(A)=.60, P(A/B)=.50, AND P(B)= .40, answer the following. 1) events A and B are independent =FALSE true or false or cannot determine 2) events A and B are disjoint =TRUE true or false or cannot determine 3) find P(A and B) =??????
*April 8, 2013*

**math**

There are 3 reds, 4 blues, 6 whites and 5 yellows in a bag. What is the probability that the first two you draw are both red if you do not replace the first one?
*April 6, 2013*

**Physics**

Light with a wavelength of 500 nm (5. 10-7 m) is incident upon a double slit with a separation of 0.28 mm (2.80 10-4 m). A screen is located 2.7 m from the double slit. At what distance from the center of the screen will the first bright fringe beyond the center fringe appear...
*April 5, 2013*

**Physics**

Light with a wavelength of 500 nm (5. 10-7 m) is incident upon a double slit with a separation of 0.44 mm (4.40 10-4 m). A screen is located 2.1 m from the double slit. At what distance from the center of the screen will the second dark fringe beyond the center fringe appear? ...
*April 5, 2013*

**health**

BMI is used to screen for______?
*April 1, 2013*

**weight**

researchers found that a ____ is more important and is the key to losing weight rather than a popular one.
*April 1, 2013*

**health**

for adults which ranges reflect an accurate BMI category
*April 1, 2013*

**weight**

why is having abdominal fat a serious concern
*April 1, 2013*

**health**

in order to loose weight you have to ___
*April 1, 2013*

**health**

national weight control registry
*April 1, 2013*

**health**

Why are fad diets considered unhealthy?
*April 1, 2013*

**weight**

Obesity can cause a person to develop what type of conditions?
*April 1, 2013*

**weight**

If you decided to lose weight then ____ help?
*April 1, 2013*

**Bio Help Please!!!**

1)How can you indicate that the bacteria have taken up the plasmid? 2)What is the purpose of the LB/amp(-) plate? Should there be bacterial growth on the plate? 3) Why would one compare plates LB/amp (-) and LB/amp (+)?
*March 31, 2013*

**Bio Help Please **

1)How can you indicate that the bacteria have taken up the plasmid? 2)What is the purpose of the LB/amp(-) plate? Should there be bacterial growth on the plate? 3) Why would one compare plates LB/amp (-) and LB/amp (+)?
*March 30, 2013*

**math**

y=-2x-1 how to set up to find what x is, this needs to graph as a linea equation.
*March 20, 2013*

**Physics**

A test charge of +3.00 10-6 C experiences a downward electrostatic force of 11 N when placed at a certain point in space. What are the magnitude and direction of the electric field at this point?
*March 18, 2013*

**physics**

Two identical thin wires are oriented along the x and y axes. With current on x plane going North. Current on y plane going West.Both carry the same current I, and there is no electrical contact between the wires. The points A, B, C, D are each equidistant from both wires. A: ...
*March 16, 2013*

**Math **

Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 – 4 at the point (1,-3/13)
*March 14, 2013*

**Math**

Steve, That still isn't the correct answer :(
*March 14, 2013*

**Math **

Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 – 4 at the point (1,-3/13)
*March 14, 2013*

**Microbiology**

if the original concentration of phage was markedly increased from the concentration that you received, how could you ensure that you had between 30-300 plaques on your plate? (instead of TNTC)
*March 11, 2013*

**Statistic HELPPPPPP**

A linear model can be used to describe the relationship between fuel economy(mpg) and horsepower (hp) for certain automobile models. mpg=46.868-0.0838 hp R^2=75.5% 1) Give the symbol and the value of the correlation coefficient. 2)What would the gas mileage be for a car with a...
*March 11, 2013*

**math**

A Model M3SWE mandolin has a list price of $1299.90, with a chain discount of 5/3/2. (A) What would be the trade discount amount? (B) What would be the net price?
*March 4, 2013*

**Math**

Amy Powell invested $8500 twice a year in an ordinary annuity at New York Securities for a period of 5 years at an annual interest rate of 10% compounded semiannually. Using the ordinary annuity table , calculate the total value of the annuity at the end of the 5-year period
*February 27, 2013*

**Diff eq**

y'(x)=sqrt2y(x)+7, y(4)=1 Solve the seperable diff eq
*February 24, 2013*

**Stat Help Please**

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to screen.
*February 23, 2013*

**Stat Help Please**

Determine which sampling method was used in each scenario. on a particular day 5 flights are selected at random and all of the passengers on these 5 flights are screened. Airport security uses a random number generator to determine the next passenger to screen.
*February 23, 2013*

**history**

Who came to power in China, instituting a Communist regime that would bring great suffering to the nation's people
*February 22, 2013*

**Math**

I don't get this question at all.Can you help me?
*February 21, 2013*

**Global History**

How were the Mongols able to conquer so much territory so rapidly?
*February 20, 2013*

**statistics**

A television program director has 14 shows available for Monday night and 5 shows must be chosen. How many different possible combinations are there?
*February 15, 2013*

**math**

a wheel makes 8 1/10 revolutions per minute if it rotates for 85 mins. how many revolutions will it make
*February 10, 2013*

**Math**

The Midtown Middle School cheerleaders earned $175 at a car wash. If this amount is 25% of the cost of a new set of uniforms, what is the total cost fora a set of uniforms? Explain your reasoning.
*February 7, 2013*

**general chemistry**

so to get volume, you do v=(1.33)*3.14*99e-7^3????
*February 6, 2013*

**general chemistry**

the radius of a chlorine atom is 99 pm and its mass is 5.89 X 10^-23 grams what is the density
*February 6, 2013*

**chemistry**

inorganic chemistry
*February 5, 2013*

**chemistry**

I am supposed to add NH4 and C2H3O2 together and write the new ion. Would it be NH7C2O2? do I add the hydrogens together and were would it go in the order then?
*February 5, 2013*

**Sociology HELPPPP**

How does deviance and crime function both for and against society? Be sure to include social control in your answer group.
*February 1, 2013*

**Vector Calculus**

An airplane is traveling in the direction 20degrees west of north at 700 km/hr. Find the component form of velocity of the airplane assuming that the positive x-axis represents due east and the positive y-axis represents due north.
*January 26, 2013*

**american government**

judicial review is the power of the american courts to:
*January 21, 2013*

**algebra**

Determine which of the flowing points lie on the line given by the equation 3x+6y=12
*December 16, 2012*

**Physics**

A sound wave is traveling in warm air when it hits a layer of cold, dense air. If the sound wave hits the cold air interface at an angle of 23 degree angle, what is the angle of refraction? Assume that the cold air temperature is -10 degrees C and the warm air temperature is +...
*December 13, 2012*

**physics**

A particular guitar string is supposed to vibrate at 210Hz , but it is measured to vibrate at 220Hz By what percent should the tension in the string be changed to correct the frequency?
*December 13, 2012*

**Physics**

Assuming the fluid has a density of 1.00 (g/cm^) at what height h should the bottle be placed so the liquid pressure is 38mm-Hg ? B.At what height h should the bottle be placed so the liquid pressure is 460mm-H_2O ? C.If the blood pressure is 18 {mm-Hg} above atmospheric ...
*December 11, 2012*

**Physics**

Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 40m above that pipe. Pa?
*December 11, 2012*

**Physics**

A 7.9cm diameter horizontal pipe gradually narrows to 5.9cm . When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 31.0kPa and 21.0kPa , respectively. What is the volume rate of flow? in m3/s please help!
*December 11, 2012*

**Biology**

The half-life of Carbon-14 is 5730 years. What is the age of a fossil containing 1/16 the amount of Carbon-14 of living organisms? Explain your calculation.
*December 9, 2012*

**Physics**

a child twirls a yo-yo about in a horizontal circle. The yo-yo has a mass of 0.20 kg and is attached to a string 0.8 m long. what is the velocity of the yo-yo? thanks!
*December 6, 2012*

**physics**

A 160kg horizontal beam is supported at each end. A 330kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports?
*November 27, 2012*

**Physics**

SOrry! the units are 11500rmp 1.52 m*N 6.07kg 0.0750m
*November 27, 2012*

**Physics**

A centrifuge rotor rotating at 11500 is shut off and is eventually brought uniformly to rest by a frictional torque of 1.52 . a.If the mass of the rotor is 6.07 and it can be approximated as a solid cylinder of radius 0.0750 , through how many revolutions will the rotor turn ...
*November 27, 2012*

**Algerbra**

Combine and show all work please 3/2y+2/y-1-2/y
*November 24, 2012*

**Algerbra**

simplify a-1/a ___________ 2+3/2+1/a^2
*November 24, 2012*

**math**

Use the tangent line approximation to approximate the value of ln(1.004)
*November 19, 2012*

**Chemistry**

thanks! But it turns out I was over thinking it!
*November 19, 2012*

**Chemistry **

In this lab experiment you will make 100.0 mL of a 0.100 M solution of Co(NO3)2. However you must calculate the number of moles of compound that will be needed (moles= Molarity x Liters).Then calculate the mass of Co(NO3)2 that will need to be weighed out (mass= moles x molar ...
*November 19, 2012*

**math**

a small business loan in the amount of 50,000 with an interest rate of 9% that compounds monthly for 7 years what would my monthly payment be
*November 12, 2012*

**math**

State a trigonometric ratio that is equivalent to each of the following trigonometric ratios Sin 3pie/10 Cos 6pie/7
*November 10, 2012*

**Physics**

A hydraulic lift is used to jack a 780 kg car 15 cm off the floor. The diameter of the output piston is 15 cm, and the input force is 160 N. a)What is the area of the input piston (in m^2)? b)What is the work done in lifting the car 15 cm? c)If the input piston moves 13 cm in ...
*November 10, 2012*

**Physics **

Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 1.6000kg when weighed in air.
*November 10, 2012*

**physics**

A newspaper carrier on delivery route travels 200.-m South-West and 300.-m West. What is the direction of the displacement
*November 8, 2012*

**physics**

A newspaper carrier on delivery route travels 200.-m South-West and 300.-m West. What is the magnitude of the displacement?
*November 8, 2012*

**accounting**

Analyze and record, in the form of T Accounts, Mr. James' transactions: Jan 1: Amount invested in the business $10,000 Jan 7: Bought equipment for $500 Jan 9: Bought office furniture with $2,000 cash Jan 10: Bought materials with $2,000 cash Jan 17: Sold part of equipment...
*November 6, 2012*

**Chemistry**

convert 458166 atoms of H20 to moles
*November 6, 2012*

**pre algebra**

A woman who is 5feet 4 inches cast a shadow that is 6 feet tall. How long of a shadow would be cast by a man who is 6 feet 8 inches tall
*November 5, 2012*

**Algerbra**

George pays a flat amount for the first 200 minutes plus so much for each additional minute on his cellular phone each month. Last month it cost him $33.78 for 244 minutes of use. The previous month it cost $38.94 for 287 minutes of use. What are the flat rate and per minute ...
*November 2, 2012*

**Math**

Jared can paddle his canoe 1 mile upstream in 1 hour, but it takes only a half hour to paddle back the same distance. Find the speed of water. (Hint: d=rt and the rate or canoe speed, depending on which way he is going.)
*November 2, 2012*