Tuesday

January 17, 2017
Total # Posts: 1,616

**chemistry**

One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide from a solution containing rhodium(III) sulfate According to the following balanced chemical equation: Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq) What is the ...

*March 14, 2013*

**chemistry**

For the reaction 2A(g) + B(aq) + 3C(l)<------> D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr i got an answer of 1.83x10^-13 is this correct??

*March 14, 2013*

**chemistry**

i'm sorry the equation is 2A + 3B +C<--->2D +3E

*March 13, 2013*

**chemistry**

the concentrations and pressures at equilibrium were found to be: 1.6 × 10–2 M for A, 8.1 × 103 Pa for B, 13.6 M for C, 13.1 M for D, and 3.9 × 104 Torr for E. Calculate the equilibrium constant, K the right answer is 1x10^12 i tried this problem so many...

*March 13, 2013*

**Algebra**

Would you please show me how you arrived at that answer. I do not know how to set up the problem to get the answer. Thanks

*March 13, 2013*

**math**

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing?

*March 6, 2013*

**math**

A circular pool has a diameter of 12 feet. The pool is 5 feet deep everywhere. How much water is needed to fill the pool?

*March 6, 2013*

**math**

A community center is expanding the size of its rectangular meeting hall. The hall is currently 300ft long and 150ft wide. The center plans to expand both the length and the width of the meeting hall by 3x ft. What polynomial in standard form represents the area of the ...

*March 4, 2013*

**math**

The radius of a cylinder is 3x-2 cm. The height of the cylinder is x+3 cm. What is the surface area of the cylinder? The choices are: 2pi(3x^2 + 10x - 8) 2pi(12x^2 + 7x - 2) 2pi(12x^2 - 2x + 13) 2pi(12x^2 - 5x - 2) Please help me in setting this up and solving. Thanks

*March 4, 2013*

**physics**

the coefficient of friction between a block of weight 15N and a horizontal board on which it is resting is 3.0find the horizontal force which will just remove the block and the force acting at an angle of 30 with the horizontal which will just move the block.

*March 1, 2013*

**math**

A rectanglar blacktop with a length of 5x and a width of 3x has been erected inside a rectangular field that has a length of 12x and a width of 7x. What is the area of the part of the field that is not blacktop? (I believe the answer is 69x^2) There is a circular fountain in ...

*March 1, 2013*

**math**

There is a circular garden in the middle of a square yard. The radius of the circle is 4x. The side length of the yard is 20x. What is the area of the part of the yard that is not covered by the circle?

*March 1, 2013*

**Math (2nd Try)**

A rectangle has a length of 6x^3 y^2 - 1 and a width of 3xy + 2. The formula for the perimeter of a rectangle is P=2l + 2w, where l is the length and w is the width. What is the perimeter of the rectangle? Simplify your answer.

*March 1, 2013*

**Alg. I**

A rectangle has a length of 6x^3 y^2 - 1 and a width of 3xy + 2. The formula for the perimeter of a rectangle is P=2l + 2w, where l is the length and w is the width. What is the perimeter of the rectangle? Simplify your answer.

*February 28, 2013*

**Alg. I**

(-5d^-5) (6d^2) -30d^-3 I know that d^-3 goes on the bottom to make it positive;however,does -30 go on the bottom as well? Please explain the rule(s) for this. Thanks

*February 26, 2013*

**physics**

A proton (mass m = 1.67 10-27 kg) is being accelerated along a straight line at 2.1 1015 m/s2 in a machine. The proton has an initial speed of 2.4 107 m/s and travels 4.2 cm. (a) What is its speed? 1 . m/s (b) What is the increase in its kinetic energy? 2 . J

*February 25, 2013*

**Thermodynamics**

A cylinder contains one liter of air at room temperature (300 K) and atmospheric pressure (10^5 N/m^2). At one end of the cylinder is a massless piston, whose surface area is 0.01 m^2. Suppose that you push the piston in very suddenly, exerting a force of 2000 N. The piston ...

*February 23, 2013*

**Precalc**

The vectors, (2, -1) and (4, 8), are 1)parallel 2)perpendicular 3)neither parallel or perpendicular

*February 23, 2013*

**Precalc**

Write the complex number z = 2 + 5i in polar form, rounding to the nearest hundredth if needed.

*February 23, 2013*

**Precalc**

Convert the complex number c=3cis 0.25 into rectangular form.

*February 23, 2013*

**Precalc**

Write the complex number z = −6 in polar form

*February 23, 2013*

**Algebra I**

The cost of 4 scarves and 6 hats is $52. The cost of two hats is $1 more than the cost of one scarf. What are the costs of one scarf and one hat? Please show me how to set this up and work it.

*February 21, 2013*

**Physics**

the energy that can extracted from a storage battery is always less than the energy that goes into it while it is being charged. why?

*February 18, 2013*

**Statistics**

2/2.5 = 0.8 z=0.7881 1-0.7881 = 0.2119

*February 10, 2013*

**Statistics**

The lengths of pregnancies are normally distributed with a mean of 273 days and a standard deviation of 20 days. If 64 women are randomly selected, find the probability that they have a mean pregnancy between 273 days and 275 days.

*February 10, 2013*

**Statistics**

-2 z=0.0228 1-0.0228 answer 0.9772

*February 10, 2013*

**Statistics**

54.5-50/50 = 4.5/5 = 0.9 z= 0.1841

*February 10, 2013*

**Science (8th grade)**

You just forgot to include the decimals :) a snail dosen't go over 4000 mph! Use common sense before turning these things in. Once said a turtle went 50 mph on a test,,, silly me

*February 9, 2013*

**English**

Yes, though using "cannot" instead of "can't" eliminates the awkward double contraction

*February 9, 2013*

**Science**

A stretched spring with k=21.6 N/m is pulling with a force of 1.5 N. How much work was done to stretch the spring

*February 6, 2013*

**physics**

An object is dropped from ret from a height of 39.4m. What is its average acceleration (assumed to be constant) if it hits the ground with a speed of 1.61m/s? My quesion is, is a not 9.8 since gravity is acting on the object.

*February 2, 2013*

**science**

"Reproductive cells and somatic cells are not separated early in development, as they are in animals。 Instead, plant somatic cells that have undergone many rounds of mitosis can undergo meiosis and produce gametes." This is said in my notes under properties of...

*February 2, 2013*

**math**

mark recently completed a math course in which he took three tests. his scores were 80,75,85 each time out of 100 points. What score represents marks total achievement in the course?

*January 28, 2013*

**physics**

An airplane flies 200km due west from city A to city B and then 305km in the direction of 33.5 degrees north of west from city B to city C. a.) in straight-line distance, how far is city C from city A? b.) relative to city A,in what direction is city C? c.)Why is the answer ...

*January 28, 2013*

**physics**

A girl delivering newspapers covers her route by traveling 10.00 blocks west, 4.00 blocks north, and then 5.00 blocks east. a.) what is her resultant displacement? b.) what is the total distance she travels?

*January 28, 2013*

**physics**

a person walks 13.0 degrees north of east for 3.80km. How far due north and how far due east would she have to walk to arrive at the same location?

*January 28, 2013*

**math**

A bag contains ﬁfty slips (small pieces of paper) with the numbers 1, 2, . . . , 50 written on them (One number on each slip!). Your friend writes down ten numbers from 1, 2, . . . , 50 on a sheet of paper, and then you draw—without replacement—twenty slips ...

*January 27, 2013*

**Medical Terminology**

when comparing Hemodialysis and Peritoneal dialysis, it can be said that?

*January 24, 2013*

**Math: Algebra**

The points (5,2), (-10,-2), and (t,01) lie on the same line. Find the value of t. Please help me!

*January 18, 2013*

**Chem**

Rario z 1:2.mass ratio z 32 g:60 g.Therefore 64.69 g of li2o.

*January 7, 2013*

**the science of the mind (psychology)**

It's not C

*January 1, 2013*

**trigo**

the front wheel of a bicycle has a diameter of 16 in and the back wheel has a diameter of 26 in. through what angles does the front wheel turn if the rear wheel turns through 24 radians?

*December 28, 2012*

**Math**

is this right

*December 6, 2012*

**Math**

%68 0.9655 40 30

*December 6, 2012*

**Math**

? 3. the persents are 34/50

*December 6, 2012*

**Math**

3. In the small country of Varia, a bill becomes law only if of the senators approve it. What percentage is ? (1 point) 53% 58% 68% 88% 4. Write the percent 96.55% as a decimal. (1 point) 9655 965.5 0.9655 9.655 5. Liam wants to buy a bicycle that costs $290.00. His parents ...

*December 6, 2012*

**Math**

Jess is running around a circular track, one lap every 40 seconds. Mackenzie is also running at a constant speed around the same track, but in the opposite direction. They meet every 15 seconds. How many seconds does it take Mackenzie to do one lap?

*December 5, 2012*

**Math**

Oh i see now! Ok thank you!

*December 4, 2012*

**Math**

So what exactly would the answer be? im confused..

*December 4, 2012*

**Math**

Peter has 1200 yards of fencing to enclose a rectangular area. Find the dimensions of the rectangle that maximize the enclosed area?

*December 4, 2012*

**university physics**

come on guys,it's urgent

*December 4, 2012*

**university physics**

A cryogenic storage container holds liquid helium, which boils at 4.20 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.615 m2 and is at 3.01·102 K. a) Determine the ...

*December 4, 2012*

**university physics**

A copper sheet of thickness 2.19 mm is bonded to a steel sheet of thickness 1.13 mm. The outside surface of the copper sheet is held at a temperature of 100.0°C and the steel sheet at 25.7°C. a) Determine the temperature (in °C) of the copper-steel interface. b) ...

*December 4, 2012*

**Biology**

Hemoglobin is physiologically designed to deliver more Oxygen to exercising tissues than to resting tissues. Discuss three pieces of evidence that support this argument.

*December 4, 2012*

**Astronomy**

What is the size of the smallest craater on the moon that you can see with a telescope with a resolution of 2 arc seconds at a distance of 384,400 km?away

*December 3, 2012*

**Astronomy**

What is the maximum altitude above the horizon at which it is possible to find the moon when you are observing from a position at 42 degrees northern latitude?

*December 3, 2012*

**Astronomy**

What is the radius of the sun?

*December 3, 2012*

**math**

There were 20% more boys than girls in a swimming club. After 50 girls left, there were twice as many boys as girls in the club. How many boys were there in the club?

*December 2, 2012*

**math**

The ratio of the number of girls to the number of boys in a stamp club was 3 : 2 last year. When 15 boys joined the club this year, the ratio became 2 : 3. Find the total number of children in the club this year.

*December 1, 2012*

**math**

There were 20% more boys than girls in a swimming club. After 50 girls left, there were twice as many boys as girls in the club. How many boys were there in the club?

*November 30, 2012*

**Math**

a bout travels 1km upstream and 1 km downstream.it took the boat 1 hour for the round trip. the speed of the current is 2 kph. find the speed of the boat in still water.

*November 30, 2012*

**math**

what abot if it was 34/50

*November 30, 2012*

**poetry**

thanks so is this a free verse

*November 27, 2012*

**poetry**

this is how i put it in my own words Each month passed us by we were in endless winter every day was cold as ever and night so harsh an cruel we wait for the return of the glorious wonder,the sun

*November 27, 2012*

**poetry**

this is the first saanzer of Scott Goodbye we saw the months of wicked weather, As day to painful night did turn, Waiting, huddled close together For the frozen sun’s return.

*November 27, 2012*

**poetry**

i don't know how to rewrite it

*November 27, 2012*

**poetry**

9. Rewrite the first stanza of “Scott’s Goodbye” as free verse. (5 points)

*November 27, 2012*

**Poetry**

thanks

*November 27, 2012*

**Poetry**

is this right

*November 27, 2012*

**Poetry**

i think its Our food was gone. Our fuel was low

*November 27, 2012*

**Poetry**

thank you

*November 27, 2012*

**Poetry**

2. Which of the following lines from the poem includes an example of alliteration? (1 point) Waiting, huddled close together Our food was gone. Our fuel was low. Amundsen had reached the Pole. We had come pursuing glory

*November 27, 2012*

**math**

Mr.Jacobsen wants to hire a magician for his son's birthday party. Marion has a travel fee of $30 and charges $15 per hour. Gregory has a travel fee of$50 and charges $10 per hour. Define a variable. Then write a system of equatins to represent the situation. Solve the ...

*November 26, 2012*

**math**

Robert has 26 coins that are all nickels and dimes. The value of the coins is $1.85. Write and solve a system of equations thatrepresents this situation.

*November 26, 2012*

**math**

Joseph sold tickets to the school musical. He had 12 bills worth $175 for the ticketssold. If all the money was $5 bills, $10 bills, and $20 bills, how many of each bill did he have?

*November 26, 2012*

**math**

Lena bought a total of 20 postcards. She bought 6 more large poscards than small. Write a system of equations that represents the postcards Lena purchased. Solve the system by substitution. Interpret the solution.

*November 26, 2012*

**math**

Could you please show me how to work this problem? Each hand in the human body has 27 bones. There are 6 more bones in the fingers than in the wrist. There are 3 fewer bones in the palm than in the wrist. How many bones are in each part of the hand?

*November 26, 2012*

**English - Ms. Sue help**

hi can u help on this question 2. Which of the following lines from the poem includes an example of alliteration? (1 point)

*November 13, 2012*

**math**

If y varies diretly with x, write an equation for the direct variation. then find each value. Find y when x = 10 if y = 8 when x = 20 If think I can find the value by y/10 = 8/20 with the answer for the value is 4. My problem is how to find the equation. Please explain.

*November 6, 2012*

**English**

to give me the speaker in a debaten the answer

*November 1, 2012*

**Algebra**

Two trains, one express and one local, leave Indianapolis at noon and head for Chicago 220 miles away. The express travels twice as fast as the local and arrives 2 hours ahead of the local. Find the speed of each train.

*October 30, 2012*

**Physics**

A current of 60 mA passes through a loudspeaker of resistance 6 Ω. What is the potential difference across the resistance of the loudspeaker? 36.0 V 10.0 V 0.36 V 0.10 V Answer B seems like it would be the obvious answer..

*October 22, 2012*

**Algebra**

The difference between the digits in a two-digit numeral is 3. The units' digit is twice the tens' digit. Find the nuermal.

*October 22, 2012*

**algebra 1**

top and bottom margins are 7/8 inch there are 5 rows of pictures with 3/16 inch between the vertical what would be the height of each picture

*October 22, 2012*

**math**

Courtney wanted to share raisins with Norman and Mark. She counted 36 raisins in her box. She said "If we all have the same number of raisins, there are 98 raisins in all." What is wrong with Courtney's statement?

*October 21, 2012*

**math**

sorry I post 56 instead of 58, the dimensions are 20ft by 58ft

*October 21, 2012*

**math**

The dimensions of the dog part are 20ft by 56 ft. Set up the problem w + w + ( 3w - 2 ) + ( 3w - 2 ) = 156

*October 21, 2012*

**Business math**

24040.82

*October 21, 2012*

**science**

Three lead balls of mass m1 = 14 kg, m2 = 26 kg, and m3 = 8.7 kg are arranged as shown in the figure below. Find the total gravitational force exerted by balls 1 and 2 on ball 3. Be sure to give the magnitude and the direction of this force.

*October 21, 2012*

**physics**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.04 m/s, and an 65.2-kg person feels a 290-N ...

*October 8, 2012*

**science**

One truck load is 2.5* 1.5* =3.75m^3

*October 8, 2012*

**Physics**

A balloon carrying a basket is descendign with a constant acceleration of g/3. the total mass of the basket and contents is mB.you see water below and decide you need to throuw out some mass to allow the basket to rise and not hit the water. how much mass should you throw out ...

*October 8, 2012*

**physics**

A crate is pulled to the right with a force of 84.5 N, to the left with a force of 116.5 N, upward with a force of 685.7 N, and downward with a force of 242 N. What is the net external force in the x direction?

*October 7, 2012*

**physics**

Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 52.7 N to the north. Jenny’s foot exerts a force of 91.8 N to the east. a) What is the magnitude of the resultant force on the ball? b) What is the direction of the resultant ...

*October 7, 2012*

**Biology**

Some genes are said to be “linked”. Explain this term and the implications it has as to the inheritance of certain traits. Provide 2 (human) examples of linked genes? PLEASE HELP ITS A REQUEST

*September 26, 2012*

**grade12 bio**

Some genes are said to be “linked”. Explain this term and the implications it has as to the inheritance of certain traits. Provide 2 (human) examples of linked genes?

*September 26, 2012*

**physics**

Maria throws an apple vertically upward from a height of 1.3 m with an initial velocity of +2.6 m/s. Will the apple reach a friend in a tree house 2.4 m above the ground? The acceleration 1. No, the apple will reach 1.37063 m below the tree house 2. Yes, the apple will reach 1...

*September 25, 2012*

**Algebra**

Natalie has some nickles, Dirk has some dimes, and Quincy has some quarters. Dirk has five more dimes than Quincy has quarters. If Natalie gives Dirk a nickel, Dirk gives Quincy a dime, and Quincy gives Natalie a quarter, they will all have the same amount of money. How many ...

*September 24, 2012*

**Doe**

A car traveling at 6.7 m/s accelerates 2.1m/s2 to reach a speed of 12.0 m/s. How long does it take for this acceleration to occur? Answer in units of s

*September 24, 2012*