Saturday

April 19, 2014

April 19, 2014

Total # Posts: 1,022

**Math-7th grade**

1.75 Thank you, But what about for day one? If it's 1.75 per day, how is the first day charge 3.75?

**Math-7th grade**

Im having trouble solving the amount per day... The table below shows the relationship between d, the number of days a DVD is returned late to a video rental store, and f, the amount of the late fee. Write an algebraic expression that describes this relationship? Prove your an...

**7th Grade Math**

I believe 21 2 doubled is 4 4 + 5 is 9 a quarter of 9 is 3 3+9 is 12 12 plus two is fourteen and half of fourteen is 7 7 plus 14 is 21.

**7th grade Math**

Thank you so much! I didnt understand it at all!

**7th grade Math**

A space probe is 7.62 x 10 to the 7th power kilometers from the surface of the planet Mars. If the space probe is traveling towards mars at a arate of 127 meters per second, how many hours will it take the probe to reach the surface of the plant? Round to the nearest hour. Hel...

**7th grade math**

Its a math homework assignment

**7th grade**

A space probe is 7.62 x 10 to the 7th power kilometers from the surface of the planet Mars. If the space probe is traveling towards mars at a arate of 127 meters per second, how many hours will it take the probe to reach the surface of the plant? Round to the nearest hour. Help!?

**Math**

jk sorry that was my sister she wont do it agin

**Math**

jk sorry that was my sister she wont do it agin

**math**

the rectangle shown above has a total of 2808 square feet. the length is 78 feet. what is the width

**7th grade**

2(2.5b-9) + 6b= -7 5B -18 +6B= -7 Add the B's 11B -18=-7 +18 +18 11B= -11 Divide by 11 each side to get B=-1

**MATH**

Carmen deposits into an account that pays simple interest at a rate of per year. How much interest will she be paid in the first years?

**Math**

19+n u#1=19+1 u#1=20 u#50=19+50 u#1=69 50(20+69)/2

**physics**

when a force of 80n acts on a 500g hockie puck, at what rate will the hockie puck accelerate?

**physics help me please!**

A certain wave is incident on an interface at an angle of 40 deg. The wave emerges into the other material at an angle of 30 deg. Crossing the interface, the wave: a. increased speed b. reduced speed c. maintained constant d. more info is needed I think reduces its speed, but ...

**algebra**

I have this problem too! I can't figure it out either. lol

**Algebra**

find the unit rate for number of parts manufactured per hour if 1630 parts are made in 6 hours. round to the nearest integer. SHOW ALL WORK.

**Physics**

A plank 2.00 cm thick and 15.0 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. A man of mass 80.0 kg is forced to stand on the very end. IF the end of the board drops by 5.00cm because ...

**Physics**

A plank 2.00 cm thick and 15.0 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. A man of mass 80.0 kg is forced to stand on the very end. IF the end of the board drops by 5.00cm because ...

**Physics-Please Help Me!!**

5.Assuming the surface tension of water is .073 N/m, what is the force required to overcome the surface tension?

**physics**

5.Assuming the surface tension of water is .073 N/m, what is the force required to overcome the surface tension?

**Physics**

5.Assuming the surface tension of water is .073 N/m, what is the force required to overcome the surface tension?

**Physics**

A flat slab of styrofoam, with a density of 32 kg/m^3, floats on a lake. What is the minimum volume the slab must have so that a 42 kg boy can sit on the slab without it sinking?

**Chemistry**

Use the given data and calculate the enthalpy change for the following: a) B2O3(s)+3COCL2(g)--->2BCL3(g)+3CO2(g) b)Hg(l) +2Ag+(aq)--->Hg2+(aq)+2Ag(s) compound: B2O3(s) COCL2(g) BCL3(g) CO2(g) Ag+ (aq) Hg2+ (aq) Delta H (standard circle)f kj/mol -1272.8 -218.8 -403.8 -393...

**physics**

What approximate change in decibles does an observer experience form a sound source if the oberver moves to a new location that is 67% as far from the source?

**physics**

A series of waves traveling at 200 m/sec are being generated by a 100 Hz source. A point at the very top of the crest of a certain wave is ____ meters from a corresponding point 3 crests away.

**physics**

A 2000 lb box is being held at rest submerged in water. The box is displacing 2500 lbs of water. When the box is released from its submerged position, the box will a. sink b. rise to the surface and float c. remain where it is d. result unknown

**physics**

A wave that is travelling due west causes particles of the conducting material to ibrate "north/south". This wave is best described as: a. longitudinal b. transverse c. translute d. permute

**physics**

You should expect concrete to have an elastic constant that is _____ than wood. a. larger than b. smaller than c. equal to

**Chemistry**

Calculate the density of F2 gas at 27 degree Celsius and 1.00 atm pressure?

**Chemistry**

How many calories would be needed to convert 8.0g of ice at 0C to steam at 100C?

**pscyhology**

everything is right except 1)a 4)a 5)a 14)a 19)d just took test

**Chemistry**

At 10 degree Celsius a sample of carbon dioxide gas has a volume of 25.5 mL under pressure of 758 mmHg. What would the volume of the CO2 sample be at STP?

**Chemistry**

Suppose a mixture of hydrogen and oxygen gas is exerting a pressure of 1.60 atm. If the partial pressure of oxygen in the mixture is 304 mmHg atm, what is the partial pressure of the hydrogen?

**Chemistry**

A rigid container of O2 has a pressure of 3.5 atm at a temperature of 713 K. What temperature would be needed to achieve a pressure of 6.0 atm?

**PHYSICS**

NEED HELP ON THE ANSWER OF THIS PROBLEM THE EFFICIENCY OF THE PULLEY DECREASES WITH A COEFFICIENT OF FRICTION OF 2.0 THE EFFICIENCY OF THE PULLEY IS 60% WHAT WOULD YOU EXPECT THE EFFICIENCY TO BE IF THE COEFFICIENT OF FRICTION INCREASED TO 0.3

**manaegerial economics**

iven a firm’s demand function, P = 24 - 0.5Q and the average cost function, AC = Q2 – 8Q + 36 + 3/Q, calculate the level of output Q which a) maximizes total revenue b) maximizes pr

**5th grade**

2 22 12 132 122 1342? What is next and what is the pattern

**Chemistry**

6M NaOH**

**Chemistry**

Calculate the approximate concentration of 41 mL of 6 M diluted to about 0.95 L of water?

**chemistry**

Should the answer be in molarity, then?

**chemistry**

What is the concentration of 10g of NaOH dizzolved in 0.95 L of water?

**science**

What mass of carbon dioxide is produced from the complete combustion of 5.20×10−3 of methane?

**us history**

False

**chemistry**

what is the difference between specific heat and heat capcacity?

**CHEMISTRY**

1.0 g of fat has 9kcal/g, while 1.0 g of carbohydrates and protein have 4kcal/g each, determine the total amount of Calories (kcal) in 1 serving if that serving contains 20.0 g of carbohydrates, 20.0 g of protein and 15.0 g of fat

**chem **

help with this problem pease Metal Specific Heat (J/g-C) Al (s) 0.900 Au(s) 0.129 Cu(s) 0.385 Fe(s) 0.444 Hg(l) 0.139 H2O(l) 4.184 C2H5OH(l) 2.46 A piece of metal at a temp of 101.0oC and a mass of 86.0 g is dropped into a beaker of water containing 75.0 ml at a temp. of 27.0o...

**ap chem**

how do you find mole fraction?

**AP Chem**

Calculate the average kenetic energy of the CH4 molecules in a sample of CH4 gas at 273K and at 546K. So, should I have two answers or one? Super confused

**Advice**

Many things can contribute to moving... such as better pay, family issues, maybe going off to get more education. The possibilities are endless.

**managerial economics**

A) Total revenue is the product of the quantity sold and the price at which they were sold. (total revenue) = Q*P = Q*(24 - .5Q) = -.5Q^2 + 24Q This quadratic function will have a maximum at Q = -24/(2*(-.5)) = 24 Total revenue will be maximized when Q = 24. B) The profit on e...

**Chemistry**

What is the empirical formula for Dichloroethane?

**chemistry**

At what temperature (C) will a gas sample occupy 6.1 L if it originally occupies 17.8 L at 27.1C? T1V1=T2V2 T1(6.1)=(17.8)(300.25) T1=876? Please check my answer

**chemistry**

At what temperature (C) will a gas sample occupy 6.1 L if it originally occupies 17.8 L at 27.1C? T1V1=T2V2 T1(6.1)=(17.8)(300.25) T1=876? Please check my answer

**Chemistry**

How many grams of KCl would be formed in the reaction of 3.000 g of K2CO3 and HCl?

**Chemistry**

How many milliliters of 6.0 M HCl would be needed if 3.000 g of K2CO3 were used in an experiment?

**Chemistry**

What is the balanced equation for the reaction of 3.000 g of K2CO3 and HCl?

**English 2**

Need help with the same questions

**chemistry**

What volume (in Liters) of oxygen must react to form 17.0L of carbon dioxide according to the following balanced equation: 2CO(g) + O2(g) --> 2CO2(g) is this correct C G02 2

**chem**

Lithium hydride reacts with water as follows. LiH(s) + H2O(l) -->LiOH(aq) + H2(g) During World War II, U.S. pilots carried LiH tablets. In the event of a crash landing at sea, the LiH would react with the seawater and fill their life belts and lifeboats with hydrogen gas. H...

**chem**

A 31.2 cm3 bubble of air at 1.4 atm pressure is subjected to a new pressure of 3.9 atm. What will be the new volume (cm3)? Assume constant temperature. THe answer I got was 11.2 cm3 is this correct

**Chemisrty **

Calculate the work done when 60.0 g of tin dissolves in excess acid at 1.00 atm and 20°C. Assume ideal gas behavior.

**chemistry**

how many moles of ions are released when 1.6 mol of ammonium phosphate is dissolved in water?

**physics**

Sorry for so many posts, but you would not use delta v/ delta t to find acceleration. correct? on the graph it shows that at 1.1 second the graph changes directions therefore the slope of the tangent line at that point is equal to zero. I plugged it into the formula you gave m...

**physics**

Oh okay, thank you. The only thing included was a graph giving the points t=0s, speed= 0cm per second; t= .5s, speed= 15cm per second; t=1.1s, speed =28cm per second; t=1.6s, speed=6cm per second.

**physics**

The figure below shows the speed of a person's body as he does a chin-up. Assume the motion is vertical and the mass of the person's body is 73.4 kg. Determine the force exerted by the chin-up bar on his body at the following times. t=0s, speed= 0cm per second; t= .5s,...

**physics**

The next thing I tried was to solve for T from by fbd. I got T=m1g-m1a for the first mass, then T1-T2=-fk*m2g+m1a for the second, and T=m3g+m3a. I dont know if this is right or not. Since I am trying to find the acceleration of each mass can i set these equations equal to each...

**physics**

Im sorry, m1 is suspended by a pulley and string on the left side, m2 is on the table connected to the pulley by a string in the middle and m3 is suspended on the right side by a pulley and string which is also connected to m2. I am pretty sure I need to find an equation in te...

**physics**

Three blocks are connected on the table as shown below. The coefficient of kinetic friction between the block of mass m2 and the table is 0.400. The objects have masses of m1 = 3.00 kg, m2 = 1.45 kg, and m3 = 1.90 kg, and the pulleys are frictionless. Determine the acceleratio...

**2nd grade math**

Shawn is writing down the family recipes in a cookbook. He has 21 recipes left to write down. He has 3 pages left to fill up. If he wants to put the same number of recipes on every page, how many goes on each?

**Physics**

It actually wants to find how far you could climb with a penny.

**Physics**

Assuming 100% of your energy can be converted to electrical power, and electricity costs $0.10 for 1 kilowatt-hour, how high should you climb to make one penny's worth of electricity? Show all work & units. I have 288.8 watts, and that's as far as I have been able to r...

**calculus**

differentiate f(x)=Tan^3(e^2x +1)

**Math**

"Kids have done bunches (of) dumb (and) clumsy mistakes" is how I remember it. Say, if you were trying to figure this problem out: 1000 mL = ___ L. "milli" is the last M. Say that's the decimal point. To get to L (base, or the middle of the letters, whi...

**Science**

A current of 7.50 amperes flows through an air conditioner. If the volyage in the wall outlet is 110 volts, what is the resistance in the air conditioner?

**chemistry**

How many grams of KCl are required to make .75 L of 0.29 M solution? Round to one decimal place. i got .2907 is this correct im not sure about the decimal places thanks

**chemistry**

oh okay i got it thanks

**chemistry**

Your answer leaves me with 1.63 so is this wrong moles oxalic acid = 0.500 L x 0.122 M=0.610 the ratio between Fe2O3 and H2C2O4 is 1 : 6 moles Fe2O3 = 0.610/6=0.102 mass Fe2O3 = 0.102 mol x 159.69 g/mol=16.3 g It left me with 16.3

**chemistry**

Oxalic acid (H2C2O4) can be used to remove rust according to the following balanced equation: Fe2O3 + 6H2C2O4 --> 2Fe(C2O4)33- +3H2O + 6H+ Calculate the number of grams of rust that can be removed by 5.00 x 102 ml of a 0.122M solution of oxalic acid. I know i need to multip...

**chemistry**

write the balanced net ionic equation for this reaction Ba(OH)2+HCL-->

**chem**

whats the net ionic equation for the following reaction AgNo3(aq)+Na2SO4(aq) answer 2Ag+(aq)+SO42- (aq)___> Ag2So4(s) correct?

**chemistry**

so would the answer be M/L= 3.22 or .0322 ?

**chemistry**

what is the molarity of a solution made by mixing 178.5 of 1.5 M NaCl with 283.4m of 4.3M NaCl Mnacl*L nacle =(1.5)(.001718)=.0026775 moles nacl=(4.3)*(.002834)=.0121862 total moles = .0026775+.0121862=.0148moles final volume = .001785+.002834=.004819 L m/l= 3.21779 I dont thi...

**chemistry**

137.33/233.43*.438=.258 .258/567*100= 44.8 got it now thanks

**chemistry**

To analyze for barium in an unknown white powder, an excess of sodium sulfate solution was added to a 0.576 g sample of the powder dissolved in water. A white precipitate of BaSO4 was isolated, dried, and found to weigh 0.438 g. What is the mass percent of Ba in the white powd...

**chemistry**

whats arrgg mean?

**chemistry**

a 340.4 ml sample of solution contains 27.4 g of cacl2. calcuate the molar concentration of calcium ion in this solution. this is what i did 27.4(110.98) =.247mol .247mol/34.4L=.726Mcacl2 is this correct?

**chemistry**

Oxalic acid (H2C2O4) can be used to remove rust according to the following balanced equation: Fe2O3 + 6H2C2O4 --> 2Fe(C2O4)33- +3H2O + 6H+ Calculate the number of grams of rust that can be removed by 5.00 x 102 ml of a 0.122M solution of oxalic acid.

**chemistry**

How many grams of water are formed when 43.4 g of hydrogen are consumed in an excess of oxygen? I got 390.6 is this correct?

**Calculus 2**

find the area of the region f(y)=y/(16-y^2)^1/2, g(y)=0, y=3

**general chem**

identify the 2 substances whose aqueous solutions have common properties to a marked degree and explain your answer. a) CuS, CuCI2, Na2 S, KCI b) HCI, HC2H3O2, NH4C2H3O2

**Economics**

Why is price stability and full employment important to our economy?

**science**

A bat flying in a cave emits a sound and receives its echo 0.4 s later. How far away is the cave wall? Assume the speed of sound to be 340 m/s. Answer in units of m.

**college physics**

A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm from the center of the disk, what are the revolutions per minute (rpms) of the disk? Can someone please help me solve this problem step by step. The ans...

**college physics **

A point (labelled P in the figure) is attached to the rim of a disk of radius 0.2 m, which can turn around an axis through its center. It is rotating counterclockwise with a speed of 2.5 m/s. Can someone please help me solve this equation step by step?

**Elements of Psychology**

i know for sure these are correct 1)d 2)a 3)d 4)b 5)c 6)a 7)b 8)c 9)c 10)a 11)a 12)d 13)a 14)b 15)a 16)d 17)b 18)c 19)a 20)a

**government**

Without the _____ to implement them, the decisions of Congress would have no meaning

**macro**

Suppose that the position of a nation's long-run aggregate supply curve has not changed, but its long-run equilibrium price level has increased. Which of the following factors might account for this event? a. A rise in the value of the domestic currency relative to other w...

**Chemistry**

Thank youuu!

**Chemistry**

How many joules (J) are needed to increase the temperature of15.0g of lead from 20 degrees celsius to 40 degrees celsius? (Specific heat of Pb is 0.128J/g degree celsius)

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