Thursday

October 27, 2016
Total # Posts: 324

**chemistry**

A 45-kg person drinks 390. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 17% of the energy in milk is converted to mechanical work, how high (in meters) can the person climb based on this energy intake? [Hint: The work done in ascending is...

*October 21, 2016*

**chemistry**

A 77.40 kg piece of copper metal is heated from 19.6°C to 337.3°C. Calculate the heat absorbed (in kJ) by the metal.

*October 21, 2016*

**chemistry**

A sheet of gold weighing 11.4 g and at a temperature of 15.6°C is placed flat on a sheet of iron weighing 24.2 g and at a temperature of 54.9°C. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings. - (11.4)(0.129)(Tf &#...

*October 21, 2016*

**chemistry**

q = (271)(1)(1.126)+(1769)(1.126) = 2297.04 q/.1219 = 18,843.64 J/g = 18.8436 kJ/g this isnt right

*October 21, 2016*

**chemistry**

A 0.1219-g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 1769 J/°C. The calorimeter contains exactly 271 g of water, and the temperature increases by 1.126°C. Calculate the heat given off by the burning Mg, in kJ/g and in kJ/mol.

*October 21, 2016*

**L.A.-Check Answer**

Cool thanks!

*October 12, 2016*

**L.A.-Check Answer**

According to "Life Without Gravity" why can astronauts' muscles become weak? a. Without gravity, the blood is rerouted from the legs to the head. b. Without gravity, the body "grows" as much as several inches. c. Without gravity, eating is difficult, so...

*October 12, 2016*

**English L.A.**

Yay! I got it right!

*October 6, 2016*

**English L.A.**

Thanks again Ms. Sue! ^_^ ;-)

*October 6, 2016*

**English L.A.**

Which of the following best describes an expository essay? a. An essay that uses casual, conversational language. b. An essay that tells a story about a real-life experience. c. An essay that explains an idea by breaking it down. d. An essay that uses humor to achieve the ...

*October 6, 2016*

**English**

Were those the correct answers Angel?

*October 6, 2016*

**English**

✓ supernatural gods or animals ✓ fantastic settings ✘ humorous elements that entertain the reader ✓ an attempt to explain the origin of the universe ✘ characters found in everyday life ✓ conflicts between worlds, beings, self, or ...

*October 6, 2016*

**L.A.**

Would't it be rising action?

*October 5, 2016*

**L.A.**

What is the part of the story in which the conflict eases?

*October 5, 2016*

**Math**

Awesome, thanks!

*October 4, 2016*

**Math**

1/2 divided by 1/2=1?

*October 4, 2016*

**M.A.T.H.**

Yes, an example would be... -7/9x3/5=-7/15

*October 4, 2016*

**history**

I think Chesapeake Affair

*October 4, 2016*

**Math**

Thanks Steve

*October 3, 2016*

**Math**

Could someone please help me if they know what the answer is?

*October 3, 2016*

**Math**

The city highway department bought 3/4 tons of salt to put on the road when it snows. They have used 2/7 of salt. How many tons has the city highway department used?

*October 3, 2016*

**Math**

Thanks

*September 27, 2016*

**Math**

And #5 should be (-2 1/5) not (2 1/5). Sorry about that :-/

*September 27, 2016*

**Math**

Sorry about #2, it should be -3 1/5+(-6 1/2)=_____

*September 27, 2016*

**Math**

What is... -1/2+1/3=_____ -1 1/5+-(-6 1/2)=_____ 5/8-(-2/8)=_____ -9/10-2/5=_____ 6 3/5-(2 1/5)=_____

*September 27, 2016*

**math**

Is the question how much they would cost together? Just clarifying. :-) If so... $0.18x14=$2.52 and... $0.69x11=$7.59 Then add... $2.52+$7.59=$10.11 Overall, the total is $10.11

*September 22, 2016*

**chemistry**

One isotope of a nonmetallic element has mass number 16 and 7 neutrons in the nucleus. The anion derived from the isotope has 10 electrons. Write the symbol for this anion. I thought the answer was O^2- but this isnt correct

*September 19, 2016*

**chemistry**

The diameter of a neutral neon atom is about 1.4 ✕ 10^2 pm. Suppose that we could line up neon atoms side by side in contact with one another. Approximately how many neon atoms would it take to make the distance from end to end 1 cm? I did 1.4 x 10^2 pm x (1 m/10^9 pm) ...

*September 19, 2016*

**English**

Could you help me with an answer? What characteristic of the narrator in "The Night the Bed Fell" ends up being key element in the story?

*September 19, 2016*

**English**

My answer is C. too

*September 19, 2016*

**Math**

Anybody there?

*September 16, 2016*

**Math**

Quick question: What is 9 squared written in standard form? It should be 81 correct?

*September 16, 2016*

**S.S.**

If anybody could correct my answers, that would be great!

*September 13, 2016*

**S.S.**

1. For centuries, Arab Muslims had generally welcomed Christian pilgrims to the Holy Land. Which group later took control of the Holy Land, attacked pilgrims, and led Pope Urban to call for the crusades? a. Mongols b. Byzantines c. Seljuk Turks** d. North Africans 2. The ...

*September 13, 2016*

**Math, Calc**

Use implicit differentiation to find an equation of the tangent line to the curve at the given point x^2+2xy+4y^2=12. Point (2,1). (Eclipse)

*September 7, 2016*

**math**

Thank you.

*July 21, 2016*

**math**

How do I write 0.8% as a fraction in lowest terms? I thought I put .8 over 10 and then multiplied by 10/10 to get rid of the decimal. So then I would have 80/100 and then reduce from there which would be 4/5, but my teacher says the answer is 1/125. Thank you.

*July 21, 2016*

**chemistry**

The compete oxidation of 2g of an aldehyde A by acidified potassium chromate produces 2.1g of carboxylic acid B which is dissolved in 50 ml of distilled water . The obtained solution reacts with exactly 1.05 g of solid lime to form salt C a) Write the equation of the reaction ...

*July 20, 2016*

**physics **

An isolated capacitor of unknown capacitance has been charged to a potential difference of 100 V. When the charged capacitor is then connected in parallel to an un- charged 10.0 μF capacitor, the potential difference across the combination is 30.0 V. Calculate the unknown...

*May 24, 2016*

**physics **

A diffraction grating having 180 lines/mm is illuminated with a light signal containing two wavelengths, λ1 = 400 nm and λ2 = 500 nm. The signal is incident perpendicularly on the grating. What is the smallest angle at which two of the resulting maxima are ...

*May 24, 2016*

**physics **

A metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end. A magnetic field of magnitude B = 0:350 T points out of the page. a) If the rails are separated by L = 25.0 cm and the speed of the rod is 55 cm/s, ...

*May 24, 2016*

**physics **

A wire has a resistance of R. What will the wire's resistance be if it is stretched to four times its original length without changing the volume of the wire? (Express in terms of R.) R=V/I; 4R=V/I; R=V/(I/4) I think this is right? help please.

*May 24, 2016*

**physics **

When 115 V is applied across a wire that is 10 m long, the magnitude of the current density is 1.4*10^4 A/m2. Find the resistivity of the wire. R=V/I; R=pL/A => V/I=pL/A => A(x)V/I(x)L=p :(π(5^2))(115)/(1.4*10^4)(10) Is this right? Do I just plug and chug now?

*May 24, 2016*

**itt-tech**

weight=mass(x)force of gravity W=(7,000)(9.8) w=?

*May 24, 2016*

**physics **

A convex spherical mirror has a radius of curvature of 50 cm. Determine the position and magni cation of the image of an object located 35 cm in front of the mirror. i only know how to do concave mirrors. i have the equations as 1/f=1/d0+1/di for position and m=hi/h0=-di/d0 ...

*May 24, 2016*

**Math10-3**

A 2 by 6 is 1 1/2 in thick. how high would a stack of 2 by 6 boards be if the stack is 10 boards high? Express your answer in feet and inches

*May 5, 2016*

**math**

the temperature at 8 a.m. was 65 degrees. By 11 a.m. the temperature had increased 17 degrees. What was the temperature at 11 a.m. ?

*March 21, 2016*

**math**

Let f(x)=2x^2−7x+5 a IS A SQUARE

*March 2, 2016*

**math **

Let f(x)=2x2−7x+5 and g(x)=x2+9. Find f⋅g, and f/g i don't understand how to do this.

*March 2, 2016*

**physics**

Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. Speaker B is 12 m to the right of speaker A. The frequency of the waves emitted by each speaker is 686 Hz. Sound velocity is 343 m/s. You are standing between the speakers, along ...

*January 17, 2016*

**general physics**

wouldn't time be 2.3 times 11/25 then? thank you

*January 14, 2016*

**general physics**

a person horizontally pushes a 25 kg couch. Applied force is 18N and average resistive force is 7N. its pushed from rest to a final speed of 2.3 what is the distance pushed the time taken and the power delivered to push couch

*January 14, 2016*

**Physics **

A boy swings a yo-yo around his head with a force of 50N what is the gravitational force of the yo-yos mass and distance is doubled

*January 7, 2016*

**metreology**

0 degrees Fahrenheit

*December 22, 2015*

**U.S Hisotry. Please check my answers.**

Why is the United States often referred to as the melting pot? -Various cultures from many countries have "melted" together to create what America is and how American culture is defined today** -Most American citizens' native customs and traditions will "...

*November 20, 2015*

**english**

what is the summary of - who’s the killer? popular justice and human rights in a south african squatter camp , by nancy schemer hughes

*November 19, 2015*

**Social Studies Please Check My Answers**

@smile more @jaja @Victoria Thanks guys! Those answers are correct! For those of you who think they're wrong, they're correct. You have my word. ;-)

*October 29, 2015*

**math**

@Melissa bowers Hope your dad's okay. @Derpy Pegasus @Damon Thanks

*October 23, 2015*

**Physics **

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...

*October 21, 2015*

**Physics **

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...

*October 21, 2015*

**Math**

Thanks Steve!

*October 13, 2015*

**Technology**

YAY!!! 100% WOOHOO

*October 6, 2015*

**al 1**

How do you solve this.....x/3+ x/2=3/4

*September 23, 2015*

**physics**

If R is the range for an angle of projectin 0f 15¤ wd the horizntl ' then the 0thr angle of projection for which the range is R 'is

*June 15, 2015*

**AP Chem ---**

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new iron sample? Please show the calculating so I can learn to do it.

*May 22, 2015*

**AP Chem ---**

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Please show the calculating so I can learn to do it.

*May 22, 2015*

**AP Chem ---**

If a radioactive nucleus alpha decays to yield a sodium24 nucleus in 14.8 hours, what was the identity of the original nucleus? Nuclear equation?

*May 22, 2015*

**Chemistry **

AP Chem ---- Which type of radiation is emitted when chromium 51 decays into manganese 51? Show the nuclear equation that explains it.

*May 22, 2015*

**Chemistry **

AP Chem --- PbS + O2 = PbO + SO2 Balance the equation and write a short paragraph explaining the electron transfers that happen.

*May 22, 2015*

**Chemistry **

AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g) Cu(s) + H2O (l)

*May 22, 2015*

**Chemistry**

Which salt would result from the acid-base reaction of phosphoric acid and potassium hydroxide? I already know I will have to write and equation and it with make water (H2O) and a salt. I think it starts like this... H3Po4 + KOH = K2HPO4 + H2O But I'm not sure what to do ...

*May 22, 2015*

**chemistry**

the accepted density of helium at stp is 0.18 g/L. during an expirement, 0.10g of helium with a volume of 0.54L at stp was collected. what is the percent error in this expirement? (accepted-expiremental)/accepted X 100

*April 21, 2015*

**Calculus **

Let f(x)=(lnx)^4 f'(x)=4(ln(x))^3/x what is f'(e^2)=?

*April 6, 2015*

**Math**

For what values of a and b is the line 3x+y=b tangent to the curve y=ax^3 when x=–3?

*February 12, 2015*

**English skills with reading**

How do I know if a paragraph lacks transitional words? Or if the paragraph contains a fragment and a run-on?

*February 7, 2015*

**Chemisty**

Slaked lime (Ca(OH)2) is formed from quicklime (CaO) by the addition of water: CaO(s) + H2O(ℓ) → Ca(OH)2(s). What mass of slaked lime can be produced from a mixture of 29.8 g of CaO and 10.3 g of H2O? Answer in units of g.

*February 4, 2015*

**Chemisty**

For the reaction 3 Mg + N2 → Mg3N2 , what is the maximum amount of Mg3N2 which could be formed from 6.66 mol of Mg and 9.34 mol of N2? Answer in units of mol.

*February 4, 2015*

**chemistry**

A CHM 111 student recorded the mass of a piece of dry lead metal as 23.7412 g. He obtained a graduated cylinder and recorded an initial water volume of 25.0 mL; upon addition of the metal, the water level rose to 27.1 mL. Calculate the density of lead in units of g/mL. (Watch ...

*January 25, 2015*

**calculus**

Previously asked: the length of a rectangular prism is increasing at a rate of 8 cm/s, its width is increasing at a rate of 3 cm/s, and its height is increasing at a rate of 5 cm/s. when the length is 20 cm, width is 10 cm, and height is 15 cm, how fast is the volume of the ...

*December 7, 2014*

**calculus**

the length of a rectangular prism is increasing at a rate of 8 cm/s, its width is increasing at a rate of 3 cm/s, and its height is increasing at a rate of 5 cm/s. when the length is 20 cm, width is 10 cm, and height is 15 cm, how fast is the volume of the rectangular prism ...

*December 6, 2014*

**Math (IB Calc)**

A ferris wheel has a diameter of 50 meters. If point A is at the lowest point of the ferris wheel, 0 meters. What is the height of point A if the wheel moves 2pi/3 radians clockwise? What is the equation?

*November 20, 2014*

**Physics**

two forces one of 12n and another of 2n act on a body in such a way that they make an angle of 90 with each other.find the resultant of the two forces.

*November 9, 2014*

**Physics**

calculate the component of a force of 200n at a direction of 60 to the force.

*November 9, 2014*

**physics**

state which of the following are vectors and which are scalars distance, mass time, weight, volume ,density ,speed verbosity acceleration ,force,temperature and energy.

*November 8, 2014*

**science**

anyone

*October 22, 2014*

**science **

1. The process in which the chromosomes in sex cells are reproduced by half is called _____________. 2. A white mouse is crossed with a black mouse. all of the offspring were grey. The genes for fur color in mice show _________. 3. Genes are specific sections of __________. 13...

*October 22, 2014*

**science **

1) a pea plant with yellow seeds is crossed with a pea plant with green seeds. all of the offsprings have yellow seeds. the allele for yellow sees is a. Dominate because all offspring have yellow seeds. b. Recessive because all of the offsprings have yellow seeds. c. dominant ...

*October 21, 2014*

**algerbra**

Graph the inequality 3x + y ¡Ü 5 on a separate piece of paper. List in the answer box:

*June 13, 2014*

**Science help!!!!**

Thanks Diana

*May 21, 2014*

**Math **

How many minutes would it take Rachel to jog 3 miles if she jogs 1/15 mile every minute?

*May 15, 2014*

**Math**

Can you help answer thx

*May 15, 2014*

**Math**

John has 1/4 yard of fabric. He cuts it into 3 equal pieces . What fraction of a yard is each piece of fabric? Choices are A. 1/12 yard B, 1/8 yard C. 1/2 yard D. 3/4 yard please help answer

*May 15, 2014*

**history **

1) in what context was the crtc and its CanCom regulations established? Describe the rationale for thw creation of the crtc. I don't understand what it means by 'in what context' and how the two parts are different from one another and how to answer them differently.

*May 14, 2014*

**Plz, Ms.Sue/anyone check my answers?**

@Alina @nichyla Thanks! Your answers were correct so I got to check my work and got 100%! @Real Answers Hey dude, hate to tell ya but I think you have the wrong lesson. :-/

*May 13, 2014*

**H.E.L.P**

Thanks Josslyn and Exactly:)! They're both correct. 100%!

*May 10, 2014*

**Science Plzz Help**

Allison is correct. 100%. My answer for number 2 though was knee and elbow. Finger and elbow was not one of my choices. Still B. though. Hope this helps! :-)

*May 6, 2014*

**Science help ASAP**

Thanks guys. These answers are all correct! Thanks Anonymous and Melissa! :-)

*May 5, 2014*

**physics**

A car is stationary at a stop sign when it is hit directly from behind by a truck of mass 3000kg which was travelling at a speed of 9 m/s immediately before the collision. The two vehicles lock together and move forward with an initial speed of 6 m/s. a) what is the mass of ...

*March 24, 2014*

**Science**

*Me beforehand* These answers better be right. *Me after* YAAAAAAAAAAAAYYYYYYYY!!!!!!!!!!!!!!!!!!! I GOT THEM ALL RIGHT!!!!!!!!!!! *Breaks out in happy dance* ^_^

*March 20, 2014*

**Math**

The formula for the velocity of an object is , where v is the velocity of the object, d is the distance traveled, and t is the time elapsed while that distance is traveled. v=d/t distance = speed times time so time in seconds = distance in meters / speed in meters/second we ...

*February 18, 2014*