# Shadow

Newest questions and responses by Shadow-
## Physics

A playground is on the flat roof of a city school, hb = 5.70 m above the street below (see figure). The vertical wall of the building is h = 6.90 m high, to form a 1.2-m-high railing around the playground. A ball has fallen to the street below, and a

*asked on December 15, 2018* -
## JAVA

Using only one "System.out.print" command, print the following quote. Make sure to include the quote marks (") in your output. "I do not fear computers. I fear the lack of them." Isaac Asimov

*asked on December 14, 2018* -
## Math

Emilio has 8450 trees to plant in rows on his tree farm he will plant 125 trees per row how many full rows of trees will he have explain

*asked on May 8, 2018* -
## math

Match the term with it's meaning real numbers irrational numbers rational numbers integers whole numbers natural numbers radical square root perfect squares cube roots terminating decimals repeating decimals truncate radicand a decimal which can be

*asked on April 17, 2018* -
## Social Studies

Why did the United States become involved in Mexico's civil war? Select all that apply. 1)Relations had weakened between the United States and the new government. 2)Mexico was unable to end the war without U.S. intervention. 3)The United States provided

*asked on February 1, 2018* -
## social studies

Which factor best accounts for the price change in the Model T automobile? A. Low deman B. Orginized labor C. Mass production D. wartime inflation

*asked on December 16, 2017* -
## math

What is the surface area of the given figure. A.) 1,008 cm B.) 1,728 cm C.) 1,392 cm D.) 1,216 cm

*asked on December 5, 2017* -
## math

which solid does the net form? hexagonal prism hexagonal pyramid rectangular prism rectangular pyramid

*asked on December 5, 2017* -
## math

sara needs to cover the top and sides of the cylinder below About how many square inches of paper will Sara need? 528 in. 415 in. 207 in. 179 in.

*asked on December 5, 2017* -
## science

A powerpoint about four landforms

*asked on November 14, 2017* -
## social studies

Which of the following laws would the free-soil party have supported? cottonocracy slave codes wilmot proviso fugitive slave act ms sue i don't want a link

*asked on November 13, 2017* -
## Language

I have to write a essay and I don't know how to lengthen the rough draft could someone please give me tips? Here's my rough draft Comparison-and-Contrast Essay The Story-Teller and The Drummer Boy of Shiloh Comparison and Contrast means to tell the

*asked on November 10, 2017* -
## social studies

Which of the following best describes the similarity between emerson's and thoreau's central beliefs? A.They both lectured on the importance of the inner light B.they both believed the human spirit was reflected in nature C.they both considered the rise of

*asked on November 3, 2017* -
## social studies

We hold these truths to be self-evident: that all men and women are created equal; that they are endowed by their creator with certain unalienable rights; that among these are life, liberty, and the pursuit of happiness what founding documents is being

*asked on November 3, 2017* -
## social studies

what is this drawing of a camp meeting likely illustrating? A. the growth of reform movements in the united states B. the large influence revivals had on americans C. the rise in the formation of women's trade unions D. the increase in support of american

*asked on November 2, 2017* -
## social studies

How did Horace Mann contribute to the reform in education? A. His development of books with raised letters aided in the education of the blind B. His educational philosophy led to a new approach in educating the deaf C. His radical call for classroom

*asked on November 2, 2017* -
## social studies

How did horace mann feel that reforming the american educational system was important? A. it would help people attain better jobs B. it would help in the fight to end slavery C. it would help in the fight for gender equality D. it would help people become

*asked on November 2, 2017* -
## science

where does energy come from in north carolina

*asked on November 1, 2017* -
## educational technology

5-7 sentences about the progressive era

*asked on October 31, 2017* -
## social studies

why does the cartoon from the bank war 1832 portray president jackson as a king? A many people felt he was motivated by his own wealth B some felt he had used his power inappropriately in vetoing legislation to recharter the bank C some felt there remained

*asked on October 20, 2017* -
## math

Solve the following proportion x/3 = 6/9 A 18 B 27 C 2 D 24

*asked on October 17, 2017* -
## math

Solve the following proportion x/3 = 8/9 A 18 B 27 C 2 D 24

*asked on October 17, 2017* -
## social studies

Why did Jefferson oppose Hamilton’s plan for creating a national bank? Select all that apply. (2 points) He argued that Congress did not have the constitutional power to establish it. He felt that there would be no way to effectively run a national

*asked on October 4, 2017* -
## social studies

Which of the following statements best summarizes Washington’s viewpoint on American foreign policy? (1 point) The United States can take advantage of Europe’s ambition. The United States should limit interaction with Europe to commerce, or trade.

*asked on October 4, 2017* -
## Math

I need helppp D: ---------------- Simplify the expression -4-5(x+8) *-5x-44 *-5x+36 *-x-8 *-20x+8 5x+6(x-2)-8(x-3) *19x+36 *19x+12 *3x-36 *3x-12 x+8

*asked on October 3, 2017* -
## math

If the relative change between the original price and the new price is 30% decrease, then the new price is ________% of the original price?

*asked on September 30, 2017* -
## math

If a number is not a rational number, then it is _____. (1 point) a integer a rational number a whole number

*asked on September 26, 2017* -
## math

Which of these nonterminating decimals can be converted into a rational number A 0.48907542 repeating B 0.02020202 repeating C 0.92589542 repeating D 0.10203040 repeating

*asked on September 26, 2017* -
## math

find the length of the hypotenuse of a triangle with legs of 5 ft and 12 ft? 11 ft 13 ft 17 ft 60 ft

*asked on September 26, 2017* -
## social studies

which of the following statements best reflects the rights of citizens that are protected by the bill of rights

*asked on September 21, 2017* -
## ELA

Your assignment for this portfolio is to do the following: research the Victorian period in England. You can focus on work, schools, historical events, cultural details, or holiday traditions. Compare the Victorian period to modern day life.

*asked on May 7, 2017* -
## math

5. 4, 12, 36, 108, . . . A. 304, 912, 2,736 B. 324, 972, 2,916 C. 354, 1,062, 3,186 D. 332, 996, 2,988

*asked on February 27, 2017* -
## science

Earth's energy sources include both renewable and nonrenewable resources. name at least three sources of energy that could be used in your house. then describe the ideal energy source for generating most of your home's electricity, and explain why you

*asked on February 27, 2017* -
## Math

A rectangular piece of fabric measures 37 by 45 inches. A triangular scarf with a height of 21 inches and a base of 25 inches is cut from the fabric. How much fabric is left over?

*asked on February 17, 2016* -
## Math

1. What value for x makes the sentence true? 7x = 1 0 6 3 2

*asked on November 25, 2014* -
## Math

The number p is the product of three different positive prime numbers greater than 2.If the sum of these three prime number is also prime, what is the smallest possible value for p? Won't the 3 number be 3-5-11? Thanks

*asked on May 21, 2014* -
## chem

Calculate the amount of heat required to convert 17.5g of ice at -33.5∘C to steam at 100.0∘C.

*asked on April 23, 2014* -
## Calculus

Find the position s as a function of time t from the given velocity v=ds/dv. Then evaluate the constant of integration so that s = s0 when, t = 0. 1. v = 3t2 , s0 = 4 I don't quite understand what the question is asking or what is s0 mean. Than

*asked on January 12, 2014* -
## Physic

A horizontal force F pulls a mass m across the floor at constant speed a distance d. If the coefficient of friction between box and floor is u, the work done by the force F is. I know W= FD and Wf = umgd, but I don't understand what the question asking.

*asked on December 9, 2013* -
## chemistry

In the following reaction, how many liters of carbon dioxide, CO2, measured at STP, would be produced from the decomposition of 143 g of magnesium carbonate, MgCO3? MgCO3----MgO+CO2

*asked on November 19, 2013* -
## chemistry

Hydrogen gas can produced by the reaction between metallic aluminum and aqueous hydrochloric acid 2Al+6HCl----2AlCl3+3H2 Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes

*asked on November 19, 2013* -
## Physic

An elevator weighing 2000 kg falls with a downward acceleration of magnitude (1/2)g . What is the tension in the supporting cable? I got the answer as 49000 N.

*asked on September 17, 2013* -
## Physic

A car traveling 100 km/h is 200m away from a truck traveling 50 km/h (in the same direction). Assuming constant braking acceleration, what is the minimum deceleration the car must have if it is not to hit the truck? Can someone hint me on how I can start

*asked on August 28, 2013* -
## Math

Let say 5m x 5m, I know the answer is 25 m^2, but let say it was 25m / 5m, what would the answer be? I know it 5 but what the unit? Just 5m? Thanks

*asked on August 25, 2013* -
## Significant Figures

The problem is 150 - 1 - 0.182 Since the least sig. fig. is 1 would the answer be 1 x 10^3 ?Thanks

*asked on August 23, 2013* -
## Math

The problem I have to solve is log with base 2 ^6 multiply by log base 6 ^ 8. I use the change of base formula and got log6/log2 * log8/log6 Which become log6/log2 * log2()^3/ log 6 I'm stuck here thanks.

*asked on June 19, 2013* -
## Chemistry

So I did a lab that consist of baking cookies and the mass of the final products isn't equal to the ingredients used. Could there be mass lost as gas ? What other factors might there be? Thanks

*asked on May 27, 2013* -
## Chemistry

Find the polar coordinate of the following. (0,-6) I know r = sq.root of 6 but tan theta = -6/0 doesn't exist so how will I find the degree? Thanks

*asked on May 19, 2013* -
## Chemistry

Find the enthalpy for : 4Fe + 3O2 = 2Fe2O3 I got the following informations: Fe + 3H2O = Fe(OH)3 + 3/2H2 - Enthalpy is 160.9 kj H2 + 1/2O2 = H2O - Enthalpy is -285.8 kj Fe2O3 + 3H2O = 2Fe(OH)3 - Enthalpy is 288.6 I try using Hess Law but cannot solve it.

*asked on May 13, 2013* -
## Chemistry

Name the compounds CH3CH2CHCH2CH3 - Is this 3-Pentane? Thanks

*asked on May 10, 2013* -
## Chemistry

How much water must be added to 6 mL of a 0.05M stock solution to diltue it to 0.02M ? The answerI got is 15 mL. Is this correct? Thanks

*asked on April 19, 2013* -
## Math

Is 2Cos x the same thing as Cos^2 x? Thanks

*asked on April 7, 2013* -
## Precalculus

Verify the identities. Cos^2x - sin^2x = 2cos^2x - 1 When verifying identities, can I work on both side? Ex. 1 - sin^2x - sin^2x = 1 - 2sin^2x 1 - 2sin^2x = 1 - 2sin^2x

*asked on April 4, 2013* -
## Chemistry

If 3.21 mol of a gas occupies 56.2 L at 44*C and 793 torr, 5.29 mol of this gas occupies __________ L under these conditions. . -How will I solve this using PV= nRT? I tried using PV= nRT. By just plugging in the value and got 131 but the answer is around

*asked on April 2, 2013* -
## Chemistry

Does mass affect pressure? I understand volume, and temperature does but not sure about mass. If I have a gas with mass 15 g, wont this exert less pressure than a gas have a mass of 30 g?

*asked on April 1, 2013* -
## Chemistry

Calculate the grams of oxygen gas present in 2.5 L sample kept at 1.66 atm pressure and a temperature of 10 C. - I got 5.72 grams Determine the volume of oxygen gas needed to completely combust 0.202 L of Butane(C4H10). -I got 1.31 L O2. -Thanks

*asked on April 1, 2013* -
## Chemistry

The temperature of oxygen is 810 torr at 298 K , what will the pressure be at 330 K? Using Lussac's Law, would the answer be 896.98 torr? Thanks

*asked on March 31, 2013* -
## Chemistry

Determine the volume of methane CH4 gas needed to react completely with 0.660 L of 02 to form methanol CH3OH I'm confused because I'm sure CH4 + O2 don't give you CH3OH. Thanks

*asked on March 29, 2013* -
## Chemistry

Do elements with higher masses always have lower average velocity than those elements with a low mass? Thanks

*asked on March 12, 2013* -
## Chemistry

I had to find the root mean square velocity of a gas using the only formula KE=1/2MV^2 . Is this even possible using only this formula?

*asked on March 11, 2013* -
## Chemistry

I had to find the root mean square velocity of a gas using the only formula KE=1/2MV^2 . Is this even possible using only this formula?

*asked on March 11, 2013* -
## Chemistry

Water has an extremely high boiling point compared to other compounds of similar molar mass because of ? Hydrogen Bond Adhesive force Covalent bonding Dispersion Forces I believe the answer is A since hydrogen bond is a strong bond and thus require most

*asked on March 11, 2013* -
## Precaculus

tan4.7 * cot4.7 I understand tan4.7 = 1/ cot 4.7 but I'm stuck after this thanks.

*asked on March 7, 2013* -
## Chemistry

What are the attractive forces that increase surface tension? -Would it be cohension and adhension? Thanks

*asked on March 6, 2013* -
## Math

How would I solve this part of the Fibonacci sequence piecewise function? f(n) = f(n-1)+f(n-2) if n > 1. Thanks

*asked on March 3, 2013* -
## Chemistry

4Fe + 3O2 = 2Fe2O3 So in math book it say " You can interpret this equation in terms of representative particles by saying that four atoms of iron react with three molecules of oxygen to produce two formula unit of iron(iii) oxide" Why it say that there

*asked on February 24, 2013* -
## Chemistry

I need to write a balance equation of the decomposition of aluminum carbonate. I know the starting "reactant" is Al2(CO3)3 but would the "product' be 2Al + 3(CO3) ? Thanks

*asked on February 19, 2013* -
## English

Is there a present and past tense of "is" and "are" ? Or it is just how they're used in the sentence that make them past/present tense? Thanks

*asked on February 18, 2013* -
## Chemistry

If I have 50 mL of Lead(II) Nitrate, it is possible for me to calculate how many mole is 1 mL of the substance? Thanks

*asked on February 18, 2013* -
## Chemistry

Because the mass of the reactants equal to the mass of the product of a reaction, the number of moles will be conserved. -I think this is sometime true but I don't know a way to prove that it sometime true. Anyone got an idea ? Thanks

*asked on February 11, 2013* -
## Math

Solve the piece wise function when f(17) f(x) = f(x-3)+2 if x > 10 -5 if x

*asked on February 10, 2013* -
## Chemistry

A mole of a pure substance contains 6.02x10^23 atoms. Alway true, sometime true or never true? -I was thinking sometime true since a pure substance can be like H2O but H2O have 3 "atoms" (Is this what you call individual part of H2O?). Each "atoms" have

*asked on February 5, 2013* -
## Chemistry

If 25 grams of copper(II) sulfate pentahydrate were heated until all water was removed, how much residue would remain?- Could someone help me understand this question? I don't understand it at all. Thanks

*asked on February 3, 2013* -
## Chemistry

Is there a chemical formula for animal fats? - Would the lipids chemical formula be the same as animal fats? Thanks

*asked on February 3, 2013* -
## Chemistry

I did a lab that involve cooking meat and finding the mass of lipids, meat tissue and water. For a chicken sample the original mass was 20 gram. After cooking there was 15.5g of meat, and 1.5 g of oil, and 1 g of water. I am missing 2 g of the original

*asked on February 3, 2013* -
## Chemistry

The problem ask what is the mass of iron(iii) chloride contains 2.35 x 10^23 chloride ions. I understand the molar mass is 162.20 g/mol. - 2.35 x 10^23 chloride ions would be around 0.39 moles. - The work that my teacher gave me is 0.39 moles * (1 mol

*asked on January 30, 2013* -
## Chemistry

How many moles of ion are in the following? A. 0.0200 g AgNO3 - Could someone give me the step to solve such problems? Thanks

*asked on January 30, 2013* -
## Chemistry

Is this true or false? Thanks A mole of CCl4 is composed of one atom of carbon and four atoms of chlorine. I put false because it contain one mole of C 4 mole of Cl. Each mole have more than one atoms. Thanks

*asked on January 29, 2013* -
## Chemistry

Let say Pb(NO3)2 combine with FeCl3, would this yield PbCl + Fe(NO2)3? Thanks

*asked on January 28, 2013* -
## Language Art

I'm currently doing a project and need a physical object to represent "racism". Anyone have a suggestion of such item? Thanks

*asked on January 26, 2013* -
## Math

The metric ton of CO2 product per gallons of gas can be calculated with the following. 8.78 x 10-3 metric tons of CO2 are emitted per gallon of gas. Let say the gallon of gas is 1288. Would the CO2 produced be around 11.3 tons? Thanks

*asked on January 22, 2013* -
## Chemistry

Let say you were given this equation: NiBr2 + Co = Ni + CoBr2 How can you tell which is liquid,gas,solid,aqueous? Do you just use what you know and figure it out? Like since NiBr2 can be broken down because of the solubility rule, you can assume it aq then

*asked on January 14, 2013* -
## Chemistry

I need to write the total ionic equation for this equation. Copper(ii)sulfate + iron = iron(iii)+ copper. Won't it be Cu2+ + SO4-2 + Fe = Fe3+ + Cu ? The answer key say 3Cu2+ + 3SO4-2 + 2Fe = 2Fe3+ + 3SO4-2 + 3Cu Where did they get the sulfate for the

*asked on January 14, 2013* -
## Chemistry

H2O2 + Heat = H2O + O2 Would this be combustion or decomposition? Since the products are H2O and O2, I thought it would be combustion but then H2O can be decompose into H2O and O2 which would be decomposition.

*asked on January 14, 2013* -
## Science

Could anyone link or tell me why does oxygen ignite at high temperature? Thanks

*asked on January 14, 2013* -
## Sicnece

A skeleton equation is not a balanced equation.- Is this sometime true, never true or always true? Can't there be some skeleton equation that is already balanced, thus it sometime true? Thanks

*asked on January 9, 2013* -
## Chemistry

Would this be a double or single replacement and why? Thanks Na2O2 + H2O -> NaOH + O2 Would it be single since the Na is pair with H?

*asked on December 19, 2012* -
## English

I'm not a native speaker of English so I have grammar problems. What are some ways that I can improve my grammar? Do reading grammar book help? Also, is there any way to improve my writing beside writing more? Thank you

*asked on December 18, 2012* -
## Chem:DrBob

Thank you for the informative answer yesterday. I hope you can help me with this one too. Thanks S(subscript 8) + O( subscript 2) -> SO3 Could you explain why it O3 when S valence is -2? Thanks

*asked on December 18, 2012* -
## Chemistry

I'm currently learning about balancing chemical equation but I don't understand the equation below. 2FE + 3CL(subscript 2) -> 2FECL(subscript 3) I understand 2FE balance out but how did 3CL2 became CL3? Thanks

*asked on December 17, 2012* -
## Chemistry

Find the energy( in KJ) of a wave with the wavelength of 507 nm. First, I turn the 507 nm into meter then divide the speed of light by it which give me the frequency. Then I take the frequency and multiply by the planck. Then I would convert the Joule to

*asked on November 7, 2012* -
## Chem:DrBob

Dr.Bob, yesterday you told me : "The best way I think is to show examples. 12Mg = 1s2 2s2 2p6 3s2 Here the 1s orbital is lower than the 2s and they are lower than the 3s etc." 19K = 1s2 2s2 2p6 3s2 3p6 3d0 4s2 Here the 1s is lower than the 2s and those are

*asked on November 6, 2012* -
## Chemistry

Is this always true, sometime true, or never true? The orbitals of a principal energy level are lower in energy than the orbitals in the next higher principal energy level. -I'm thinking sometime true but I can't figure out how to explain why it sometime

*asked on November 6, 2012* -
## Math

Is there a way to simplify this further? Thanks (√ x + √ y) / x^2+y^2 ( Square root of x plus square root of y) All divided by x^2+y^2.

*asked on September 21, 2012* -
## Chemistry

Could someone give me the steps to converting using the metric system scientific notation? For example, how would I convert 2.2 x 10^2 cm to km? Thanks ( I try Google but they only teach how to convert it when it not in scientific notations form)

*asked on September 18, 2012* -
## Chemistry

Could someone tell me how to use SI prefixes to convert within the SI unit system or link me to a website that teaches this? Thanks

*asked on September 18, 2012* -
## Math

Rounds each number to four significant figures. ( Could someone check if I'm right? Thanks) a. 431801 = 4318 b. 10235.0 = 1024 c. 1.0348 = 1.035 d. 0.0004384010 = 0.0004384 e. 0.00078100 = 0.0007810 f. 0.0098641 = 0.009864

*asked on September 12, 2012* -
## Science

Could someone help me list 15 thing that are not matter? Thanks

*asked on September 5, 2012* -
## Microsoft Word

Is is possible to do this? It a requirement by my teacher but I just can't seem to do it. " singled space text within questions and double space between your questions".- If I single space the text within the questions, won't that make it single space

*asked on May 16, 2012* -
## Math

What positive value of b makes 9^2-bx+4 a perfect square trinomial? How would you solve this problem? Thanks

*asked on March 26, 2012*