Monday

February 27, 2017
Total # Posts: 1,970

**Chemistry**

Determine the volume of nitrogen gas at a pressure of 3.00 atm if it had a volume of 400.0 mL at STP.

*April 30, 2012*

**Chemistry**

A gas is collected over water at 30.0 degrees celsius. It's pressure is 752.5 mm Hg. What is the pressure of the dry gas? Water vapor pressure at twenty degrees Celsius is 27.5 mm Hg.

*April 24, 2012*

**Chemistry**

A gas is collected over water at 30.0 degrees celsius. It's pressure is 752.5 mm Hg. What is the pressure of the dry gas? Water vapor pressure at twenty degrees Celsius is 27.5 mm Hg.

*April 24, 2012*

**math**

A pair of dice is rolled, and a number that appears uppermost on each die is observed, Refer to this experiment and find the probability of the given event. (Enter your answer as a fraction)The sume of the numbers ia an add number.

*April 21, 2012*

**Math**

2^x+1=1/16 find x

*April 17, 2012*

**chemistry**

what mass of ethanol(C2H5OH) will be required to prepare a 2.00m solution in 8.00kg of water?

*April 16, 2012*

**Mathematics**

thank you very much. in the 40 day.

*April 13, 2012*

**Mathematics**

Kate has a tennis lesson every 5 days. She has a basketball game every 8 days. If she has both a tennis lesson and a basketball game today, on what day will she have both again?

*April 13, 2012*

**Geometery**

A cylindrical water tank near Lisa's school is 18 meter high and has a circumference or 33 meter. The given formula can be used to determine the (v) of a cylinder?

*April 12, 2012*

**physics**

A child loses his balloon, which rises slowly into the sky. a) If the balloon is 21.5 cm in diameter when the child loses it, what is its diameter at an altitude of 1150 m? Assume that the balloon is very flexible and so surface tension can be neglected. b) And what is the ...

*March 21, 2012*

**physics**

Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 3527 kg), which is made of steel (ρ = 7850 kg/m^3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-...

*March 21, 2012*

**physics**

A large water tank has an inlet pipe and an outlet pipe. The inlet pipe has a diameter of 2.19 cm and is 1.25 m above the bottom of the tank. The outlet pipe has a diameter of 5.93 cm and is 4.85 m above the bottom of the tank. A volume of 0.411 m^3 of water enters the tank ...

*March 21, 2012*

**physics**

A supertanker filled with oil has a total mass of 14.1·10^8 kg. If the dimensions of the ship are those of a rectangular box 271 m long, 93.1 m wide, and 93.1 m high, determine how far the bottom of the ship is below sea level (ρsea = 1020 kg/m^3).

*March 21, 2012*

**Pre-Calculus**

Find all solutions to the equation in the interval [0, 2pi) cos4x-cos2x=0 So,this is what i've done so far: cos4x-cos2x=0 cos2(2x)-cos2x (2cos^2(2x)-1)-(2cos^2(x)-1) No idea what to do next.

*March 19, 2012*

**chemistry**

a pitcher baseball moves at 44 M/s . It has 150 J of kinetic energy on its way to the catcher. What is the baseball 's mass?

*March 16, 2012*

**donwoody**

A football field forms a rectangle. 120yd long 53yd find the perimeter

*March 15, 2012*

**childhood education**

Children readiness to engage in make believe play and the social experiences that promote it

*March 15, 2012*

**Algebra 1**

My little sister needs help on her homework and I don't remember really how to do this. I can't tell her if the answers or if she is doing them is the correct way. So if you could please tell me the answer and how you got it that would be great...

*March 14, 2012*

**english**

I need help on writing a thesis statement for my informative essay for ENC 1101. I decided to write about adoption and I want to write what the advantages and disadvantages of adoption are. I'm very undecisive on how I should write it. Please help.

*March 13, 2012*

**physics**

A small object with mass 4.05 kg moves counterclockwise with constant speed 1.70 rad/s in a circle of radius 3.15 m centered at the origin. It starts at the point with position vector 3.15 m. Then it undergoes an angular displacement of 9.10 rad. (a) What is its new position ...

*March 11, 2012*

**business math**

ms. sue, is it $ 1,754.96? Thanks

*March 11, 2012*

**calculus**

a)find the first partial derivatives of f(x y)= x √1+y^2 b)find the first partial derivatives of f(x,y)= e^x ln y at the point (0,e)

*March 11, 2012*

**calculus**

find the domain of the function f (x,y) = e^-xy

*March 11, 2012*

**C**

you are right the question is exactly like this... can you help me for this question.... thanks Write a MAIN function and a FUNCTION to compute the sum of the below series. ((-1)^(n+1)*n!)/(n^n) (from n=1 to infinity) Within the MAIN function: . Read a variable EPSILON of type...

*March 9, 2012*

**Math**

Janet has a circular garden in her front yard with a diameter of 8 feet. How does the diameter d compare to the circumference C of the garden? F) D = 1/3C G) D = 1/2C H) D = 2C I) D = 3C

*March 8, 2012*

**Math**

Sorry, The length is 7 7/8 in., and width is 5 3/4in.

*March 8, 2012*

**Geometry**

Area of trapezoid is 80 square units, height is 8 units. What is the lenght of median ?

*March 7, 2012*

**life orientation**

By quet at the job and find another job tha is gud for him by telling athers

*March 4, 2012*

**writing paper**

I need to add a cover page to my writing assinment. I can not find any information on what I include in the cover page. This is for Penn Foster College.

*March 4, 2012*

**algebra**

(3x3-4x2 -x+6) Divide By (x-2) its 9three x cubed negative 4 xsquare -x+6) divide by (x-2)

*February 29, 2012*

**Finance**

You want to have $5 million in real dollars in an account when you retire in 30 years. The nominal return on your investment is 8 percent and the inflation rate is 3.9 percent. What real amount must you deposit each year to achieve your goal?

*February 29, 2012*

**WORLD HISTORY**

My teacher ask us to draw a picture that represents a command economy what can I draw??

*February 29, 2012*

**counseling**

its with boundaries of children that have autism

*February 28, 2012*

**counseling**

when writing a paper on boundaries with children that have special needs what all would you write about? so far I have responsibility thanks

*February 28, 2012*

**Math**

what do you think about math

*February 27, 2012*

**math**

explain how the digit 1 can have diffrent values in 111

*February 25, 2012*

**math**

Tania is in charge of designing a school pennant for spirit week. She wants the base to be 3 1/2 feet and the height to be 6 1/2 feet. She has 20 square feet of paper available. Does she have enough paper? Explain.

*February 23, 2012*

**Chemistry**

how do you get the rate?

*February 23, 2012*

**math**

i have 30 coins made up of 5c and 20c pieces that total $3.45. how many of each do i have?????

*February 23, 2012*

**Physics**

Going at an angular velocity of 5.2 rad/sec, how far in kilometers will a car have traveled in 10 minutes? Do I just convert minutes to seconds and multiply or...?

*February 22, 2012*

**Physics**

A wheel 1 meter in diameter is rotating at 100 revolutions per minute without slipping along a level stretch of road and passes mile marker 0 at 12:00 noon. it continues past mile marker 0 for 10 minutes and then has a period of angular acceleration of 2.5x10^-2 radians per ...

*February 22, 2012*

**Science**

thanks

*February 21, 2012*

**Science**

Oceans receive freshwater from precipitation and rivers. Yet ocean level do not change very much from these actions. Why are ocean level not greatly affected? a) Water is constantly seeping underground in the ocean; B)Water is constantly evaporating over the ocean's ...

*February 21, 2012*

**English**

what are the strengths and what are the weaknesses of George and Lennie's relationship in John Steinbeck's "Of Mice and Men"?

*February 21, 2012*

**Pre-Calculus/Trivia**

csc(theta)= 1/x sec(theta)= 1/ sqrt(1-x^2) cot(theta)= sqrt(1-x^2)/x What are these equations used for in real life matters or in regards to calculus? Can't seem to find the answer anywhere :/

*February 20, 2012*

**history**

what did jefferson davis believe congress and the government should do about slavery?

*February 16, 2012*

**Economics**

-The "Baby Boomers" are in their retirement age. What affect might this have on the productive capacity of a country's labor force? -How does consumer demand and the price mechanism influences demand in the factor market?

*February 13, 2012*

**communication**

Can anyone explain to me what the meaning of "communication phenomenon" exactly is? Thankssss!

*February 12, 2012*

**math**

how can i make the target number 670,just by using the following digits. 6,9,6,5,9,50

*February 10, 2012*

**Social studies**

compare the political system and the political philosophies of China to those ofEgypt and Mesopotamia?

*February 8, 2012*

**Math 2**

did you hear about

*February 7, 2012*

**Sociology**

How to start my thesis statment according with C. Wright Mills about my autobiography and how relates research papers with this theme?

*February 5, 2012*

**Business Finance**

210,200.00

*January 30, 2012*

**Business Finance**

thanks

*January 29, 2012*

**math**

what is 18x5.25

*January 24, 2012*

**Algebra 1**

(8.4x10^9)(4x10^-5)

*January 14, 2012*

**chem**

Earlier I asked does the following represent an equilibrium situation: 1) A glass of iced tea still has sugar at the bottom after several minutes of stirring. If no more sugar can be dissolved could you explain why that represents an equilibrium? Please

*January 13, 2012*

**PHYSICS**

IS IT BETTER TO PUSH A GROCERY CART FROM THE BACK,OR TO PULL IT FROM THE FRONT.

*January 12, 2012*

**PHYSICS**

IS IT BETTER TO PUSH A GROCERY CART FROM THE BACK,OR TO PULL IT FROM THE FRONT.

*January 12, 2012*

**chemistry**

Do the following represent an equilibrium situation: 1) A glass of iced tea still has sugar at the bottom after several minutes of stirring. 2) The student population at a high school remains constant for 5 years.

*January 10, 2012*

**statistics**

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?

*January 9, 2012*

**chem**

1) Does a fire burning in a fireplace represent an equilibrium situation? Why or why not? 2) Does the following represent a equilibrium situation? Liquid mercury and mercury vapour are found in a thermometer.

*January 9, 2012*

**GEOMETRY PARALLELOGRAM QUESTION PLEASE HELP!**

Find the value of X and LM if L is Between N and M -NL=6x-5 LM=2x+3 and NM=30

*January 8, 2012*

**English**

So I'm writing an analytical essay on The Odyssey, about Odysseus. And I have to pick traits about him and use multiple quotes to support what I say. So I have a paragraph which I am trying to describe his homesickness. Would a quotation about how he yearned to hug his ...

*January 4, 2012*

**physics**

One end of a metal rod is in contact with a thermal reservoir at 731 K, and the other end is in contact with a thermal reservoir at 107 K. The rod and reservoirs make up a closed system. If 6450 J are conducted from one end of the rod to the other uniformly (no change in ...

*January 4, 2012*

**physics**

An outboard motor for a boat is cooled by lake water at 16.0°C and has a compression ratio of 13.3. Assume that the air is a diatomic gas. a) Calculate the efficiency of the engine's Otto cycle. b) Using your answer to part (a) and the fact that the efficiency of the ...

*January 4, 2012*

**physics**

An outboard motor for a boat is cooled by lake water at 16.0°C and has a compression ratio of 13.3. Assume that the air is a diatomic gas. a) Calculate the efficiency of the engine's Otto cycle. b) Using your answer to part (a) and the fact that the efficiency of the ...

*January 4, 2012*

**physics**

A Carnot refrigerator is operating between thermal reservoirs with temperatures of 27.9°C and 0.0°C. a) How much work will need to be input to extract 13.7 J of heat from the colder reservoir? b) How much work will be needed if the colder reservoir is at -15.7°C?

*January 4, 2012*

**physics**

A diesel engine works at a high compression ratio to compress air until it reaches a temperature high enough to ignite the diesel fuel. Suppose the compression ratio (ratio of volumes) of a specific diesel engine is 19 to 1. If air enters a cylinder at 1 atm and is compressed ...

*January 4, 2012*

**physics**

A closed auditorium of volume 27100 m^3 is filled with 2210 people at the beginning of a show, and the air in the space is at a temperature of 292 K and a pressure of 1.013·105 Pa. If there were no ventilation, by how much would the temperature (in K) of the air rise ...

*January 4, 2012*

**physics**

A diesel engine works at a high compression ratio to compress air until it reaches a temperature high enough to ignite the diesel fuel. Suppose the compression ratio (ratio of volumes) of a specific diesel engine is 19 to 1. If air enters a cylinder at 1 atm and is compressed ...

*January 3, 2012*

**physics**

Two copper cylinders, immersed in a water tank at 46.3°C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at 46.3°C. b) ...

*January 3, 2012*

**physics**

A closed auditorium of volume 27100 m^3 is filled with 2210 people at the beginning of a show, and the air in the space is at a temperature of 292 K and a pressure of 1.013·105 Pa. If there were no ventilation, by how much would the temperature (in K) of the air rise ...

*January 3, 2012*

**physics**

A closed auditorium of volume 27100 m^3 is filled with 2210 people at the beginning of a show, and the air in the space is at a temperature of 292 K and a pressure of 1.013·10^5 Pa. If there were no ventilation, by how much would the temperature (in K) of the air rise ...

*January 1, 2012*

**physics**

A gas expands at constant pressure from 6.25 L at 13.1°C until the volume is 7.25 L. What is the final temperature (in K) of the gas?

*January 1, 2012*

**physics**

A diesel engine works at a high compression ratio to compress air until it reaches a temperature high enough to ignite the diesel fuel. Suppose the compression ratio (ratio of volumes) of a specific diesel engine is 19 to 1. If air enters a cylinder at 1 atm and is compressed ...

*January 1, 2012*

**physics**

With each cycle, a 2650-W engine extracts 2330 J from a thermal reservoir at 85.1°C and expels 1840 J into a thermal reservoir at 20.9°C. a) What is the work done for each cycle? b) What is the engine's efficiency? c) How much time does each cycle take?

*January 1, 2012*

**physics**

Two copper cylinders, immersed in a water tank at 46.3°C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at 46.3°C. b) ...

*January 1, 2012*

**physics**

Air in a diesel engine cylinder is quickly compressed from an initial temperature of 21.1°C, an initial pressure of 1.00 atm, and an initial volume of 670 cm^3 to a final volume of 44.5 cm^3. a) Assuming the air to be an ideal diatomic gas, find the final temperature (in K...

*December 31, 2011*

**Precalculus**

I'm trying to verify the identity: (sin^2 x)/(2)= (secx-1)/(2secx)

*December 30, 2011*

**Math**

I'm sorry, but I don't understand...

*December 28, 2011*

**physics**

What is the minimum velocity needed for a roller coaster , traveling on the ground , to make it over a 112 m hill?

*December 27, 2011*

**physics .**

A roller coaster starts from rest 85m above the ground . Assume there is no energy lost when it reaches the top of the secound hill , which is 55m high. How fast is the tolerant coaster moving?

*December 27, 2011*

**physics**

Air in a diesel engine cylinder is quickly compressed from an initial temperature of 21.1°C, an initial pressure of 1.00 atm, and an initial volume of 670 cm^3 to a final volume of 44.5 cm^3. a)Assuming the air to be an ideal diatomic gas, find the final temperature (in K...

*December 27, 2011*

**physics**

a) What is the root-mean-square speed for a collection of helium-4 atoms at 311 K? b) What is the root-mean-square speed for a collection of helium-3 atoms at 311 K?

*December 27, 2011*

**physics**

A sample of gas at P = 1123 Pa, V = 1.41 L, and T = 291 K is confined in a cylinder a) Find the new pressure if the volume is reduced to half of the original volume at the same temperature. b) If the temperature is raised to 391 K in the process of part (a), what is the new ...

*December 27, 2011*

**physics**

Suppose 2 moles of an ideal gas are enclosed in a container of volume 2.70·10^4 m^3. The container is then placed in a furnace and raised to a temperature of 390 K. What is the final pressure of the gas?

*December 27, 2011*

**physics**

How much work is done to move a 6kg Christmas cake from the bottom shelf to.the refrigerator ( 0.5m high) to the top shelf (1.5m high)

*December 26, 2011*

**Chemistry**

The pH of a 0.002 50 mol/L solution of benzoic acid is 3.65. Calculate the Ka for benzoic acid.

*December 20, 2011*

**PHI 105 critical thinking and problem solving**

explaining the relationship between informative, explanatory and persuasive statements and critical thinking

*December 19, 2011*

**nursing**

The ANA'S ethical theories and principles and how it incorporates in its operations. Provide an example of how it applies these theories and principles

*December 17, 2011*

**Math**

f(x)=3/2x-4022

*December 14, 2011*

**physics**

A penny falls from a bridge. At 3.2 seconds it will have fallen ___

*December 14, 2011*

**physics please helpp**

A 1.67-kg block of aluminum at 21.7°C is to be melted and reshaped. How much heat must flow into the block in order to melt it? use the following values: For copper: c_copper=0.386 kJ/kg.K T_fusion=1359 K L_fusion=205 kg/K

*December 11, 2011*

**physics please helpp**

A copper sheet of thickness 2.09 mm is bonded to a steel sheet of thickness 1.35 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 26.3°C. a) Determine the temperature (in °C) of the copper-steel interface? b) ...

*December 10, 2011*

**physics**

A 1.67-kg block of aluminum at 21.7°C is to be melted and reshaped. How much heat must flow into the block in order to melt it? c_aluminum=0.386 kJ/kg.K T_fusion=1359 K L_fusion=205 kg/K

*December 10, 2011*

**physics**

A copper sheet of thickness 2.09 mm is bonded to a steel sheet of thickness 1.35 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 26.3°C a) Determine the temperature (in °C) of the copper-steel interface b) How ...

*December 9, 2011*

**physics**

Suppose 0.0210 kg of steam (at 100.00°C) is added to 0.210 kg of water (initially at 19.5°C.). The water is inside a copper cup of mass 48.9 g. The cup is inside a perfectly insulated calorimetry container that prevents heat flow with the outside environment. Find the ...

*December 9, 2011*

**physics**

A 1.67-kg block of aluminum at 21.7°C is to be melted and reshaped. How much heat must flow into the block in order to melt it? use the following values: For copper: c_copper=0.386 kJ/kg.K T_fusion=1359 K L_fusion=205 kg/K For aluminum: c_aluminum=0.900 kJ/kg.K T_fusion=...

*December 9, 2011*