# Posts by anon

Total # Posts: 2,825

**Science Help Practice **

Calculate the speed of an 90,000 kg airplane with a kinetic energy of one billion Joules. What is the mass of a car that has a kinetic energy if 4,320,000 J moving at 23 m/s? My answer to number 1= 149.07 second one- not sure. I looked up the internet for formulas on finding ...

**math**

In order for Mateo to walk 1000 meters in his rectangular backyard, he must walk the length 25 times or the perimeter 10 times. What is the area of his backyard in square meters? Thanks!

**math**

In order for Mateo to walk 1000 meters in his rectangular backyard, he must walk the length 25 times or the perimeter 10 times. What is the area of his backyard in square meters? Thanks!

**math**

I believe the answer is 86.19

**math**

if you need the answer choices I can provide them. Im stuck on how to solve

**math**

Find the missing value to the nearest hundredth. tan (?) = 15

**English check my answers **

For the following questions, identify the correct form of irregular verbs in the sentences. Choose from the word box below. A. past B. present participle C. past participle 47. Claude is getting a new computer for his birthday this year. (1 point) A B**** C 48. Yes, I have ...

**Physical science CHECK my answers**

6. Sound is an example of a(n) _____________ wave * Longitudinal******* Transverse Surface Electromagnetic 7. Which of the below options demonstrate reflection? * A rainbow Ripples in a pond******* An echo The tone that a plucked rubber band makes 8. Sound waves carry music ...

**Physical science CHECK my answers**

1. Which of the following correctly lists friction types (excluding fluid friction) from strongest to weakest? (2 points) * a. static, sliding, rolling b. sliding, static, magnetic c. weak, strong, nuclear d. rolling, sliding, static*** 2. Two or more velocities add by ...

**Math**

find an equation for a plane parallel to the xy-plane; does not pass through the origin. (I know how you would find the equation if it says passes through a certain point. But I'm confused how to do it if it says does not pass through certain point)

**Chemistry**

Oh okay. Answer: A

**Chemistry**

Which is a chemical change? A - splitting water into hydrogen and oxygen B - breaking a block of solid ice into smaller pieces C - freezing liquid water D - boiling water My answer: D

**one english question answer check**

So B?

**one english question answer check **

15. A Works Cited list is a list of (1 point) sources you quoted in your research paper. sources you consulted while doing research. texts written by experts in your research subject. texts recommended by other writers on the subject. It's either A or B my answer would be ...

**English answer check**

so my answers above are correct?

**English answer check MS. SUE SYNONYMS**

OH sorry 1. subjective 2. Gamboled 3.glimmeringly 4. Fuselage

**English answer check**

1. Like the modernists, postmodern writers focused on subjective experience rather than objective cultural norms. (1 point) expressing or dealing with facts or conditions as perceived without distortion by personal feelings, prejudices, or interpretations***** characteristic ...

**Physics**

A particle of mass 100 gm is thrown vertically upwards with a velocity of 7 m/s. Air resistance is also acting on the particle according to the equation F = -0.2v^2. ( F = Force, v = velocity of the particle ). Find how much high the ball rises. Please answer it. Thanks in ...

**Physical science CHECK my answers**

1. What is the smallest part of all matter called? (1 point) * a. Element b. Atom*** c. Molecule d. Compound 2. Which of the subatomic particles is negative? (1 point) a. Nucleus b. Neutron c. Proton d. Electron***** 3. Who provided the first evidence that atoms contain ...

**World History**

wouldnt 47 be a- food output and factory production rose?

**Math**

Could someone help? Its on connections math test unit 6 lesson 7 14x2+4+3x-12x2-3+11x

**One more question Calculus**

WHy would you add 20 ft

**Check american government answert**

4. Individuals who want to limit the number of immigrants would most likely favor which of the following? (1 point) adoption of amnesty programs for undocumented aliens increasing the number of border patrol agents passage of the DREAM Act eliminating fines for employing ...

**American Government check my answers**

1. According to the excerpt, the ruling on Obergefell v. Hodges did what? Select all that apply. (2 points) extended and continued the protections of the Equal Protection Clause to same-sex couples*** applied the Fourteenth Amendment to race rendered the Elastic Clause exempt ...

**American government check my answer**

9. According to this excerpt, President Obama would most likely support which of the following? (1 point) laws that restrict immigration from poor countries mass deportations of all illegal immigrants regardless of age construction of a wall along the border with Mexico ...

**American government check my answer**

Statement 1 – Illegal immigrants who have resided in the United States for years should qualify for alternative paths to citizenship. Statement 2 – Diversity in backgrounds and experience creates a society that teaches tolerance and respect. Statement 3 – The ...

**American government check my answer**

Oh! I didn't even notice it was a 2 answer question thank you Ms. sue for pointing that out! so would it be a? i was stuck between a and c but just realized it was a two answer question.

**American government check my answer**

5. Which of the following are examples of discriminatory laws passed by the U.S. government that impacted those depicted in the photo? Select all that apply. (2 points) Chinese Exclusion Act Civil Rights Act of 1965 Immigration Quota Act DREAM Act my answer would be ...

**American Government**

d :)

**Euclids Algorithm**

Sorry this is a really stupid question. Ive been going back to basics and im a bit lost (probably tired so I cant see the obvious) so im working out 87v+38w=d ive done the basics pretty well and have d=1. Now backwards substitution is spinning my head a bit. 11=87-2*38 5=38-3*...

**Probability and Statistics**

Hi, I am having a lot of trouble with Normal Distribution. I do online school and this lesson didn't really explain how to exactly complete the following problems. My teacher said that the answers to the problems below were all incorrect. I would greatly appreciate any ...

**Government Help**

The history of mankind is a history of repeated injuries and usurpations [seizures] on the part of man toward woman, having in direct object the establishment of an absolute tyranny over her. –excerpt from Declaration of Sentiments and Resolutions Use the passage to ...

**CHECK my answers Physical science**

10. If a solid piece of iron is heated and remains at 80°C until it is completely melted, you know that 80°C is (2 pts) * a. the freezing point of iron b. the melting point of iron c. the boiling point of iron d. both the freezing and melting points of iron my answer ...

**physics**

1. A bullet has mass 5g. It is fired with a velocity of 50 ms-1 (g=9.8 ms-2) and strikes on a pendulum of mass 5 kg. Find out the height at which the pendulum is raised.

**CHECK my answers Physical science**

sorry to both of you, these answers weren't mine! i took them from somewhere else and forgot to change them.

**CHECK my answers Physical science**

1. which of the following should be classified as a suspension? A. soda** B. sand in water C. glass D. milk 2. Which of the following is an of example of a chemical property? A. density B. flammability C. hardness** D. melting point 3. Which state of matter has a definite ...

**Health pe**

The peripheral nervous system (select all that apply) . Is made up of the brain and spinal cord. . Links the body to the brain and spinal cord *** .is made up of sensory and motor neurons **** . Is responsible for thought and reason

**Chemistry**

A possible set of quantum numbers for the last electron added to complete an atom of potassium in its ground state is a) n=4, l=0, ml=0, ms= -1/2 b) n=3, l=1, ml=0, ms= -1/2 c) n=4, l=1, ml=0, ms= +1/2 d) n=3, l=1, ml=1, ms= +1/2 e) n=4, l=2, ml=1, ms= +1/2 I want to say the ...

**GEOMETRY**

i cant post a picture of the triangles so i guess you cant

**GEOMETRY**

I need help finding the value of x could someone explain?

**Chemistry**

Give the formal change on the sulfur atom in a Lewis structure for the sulfate ion in which every atom satisfies the octet rule. 6 v.e - 4 v.e. = formal charge of +2?

**Chemistry**

So it looks like SF4 does not follow the octet rule?

**Chemistry**

Which one of the following compounds does not follow the octet rule? a) NF3 b) CF4 c) SF4 d) PH3 e) HCl I know I can eliminate A and B because nitrogen and carbon follow the octet rule. I know I can eliminate E because the total amount of valence electrons in HCl is 8. I am ...

**Math**

From a pool of six juniors and eight seniors three co captains will be chosen for the football team. How many different combinations are possible if one junior and two seniors are chosen?

**Calculus - Fundamental thm of Calc**

Use the Fundamental Theorem of Calculus to find the derivative of f(x)=?[4,x^2]((1/4)t^2?1)^15 dt

**Biology**

Mrs. Eryth is carrier of the sex-linked hemophilia allele, and Mr. Eryth is normal (as far as blood chemistry goes). A. Draw a Punnet square that shows the theoretical genotypes and phenotypes among their children. B. They actually have 4 male and 4 female children; how many ...

**Chemistry**

Choose the most polar bond from the options given below. a) B-O b) B-S c) C-N d) C-O

**Chemistry**

In a given experiment 36.44 mL of NaOH were required for neutralize a solution of HCl 0.35 M. Calculate the moles of NaOH present to neutralize the HCl in the titration.

**physics (please help I have a test tmrw) **

How much thermal energy is released when 500g of steam at 100 degrees C condenses into liquid water and then cools to 50 degrees C? I tried to solve q=mct for q and then use that in the q=mLv formula but it didn't work. The answer is 1.3x10^6J Help would be appreciated! ...

**Math**

The box-and-whisker plot below shows the numbers of text messages received in one day by students in the seventh and eighth grades at Lincoln Middle School. Two box and whisker plots are shown above a number line. The number line is scaled from 2 to 38 by twos. The first plot ...

**American Government**

100% :)

**Chemistry**

Arrange the following ions in terms of increasing atomic radius (arrange the increasing from left [lowest] to right [largest]): P3-, Cl-, K+, S2-

**Chemistry**

Explain why only four ionization energies are listed for Beryllium in the table listing ionization energies of elements.

**S.S.**

which event would benefit to producers rather than toy consumers?

**Maths**

Use proof by contraposition to prove that the following statement is true for all positive integers n: If n2 is a multiple of 3, then n is a multiple of 3.

**American Government**

3 is D, all others are correct :)

**American Government**

Was this right?

**math**

i dont know

**Chemistry**

I am little confused as well. The question that I have is that for verbatim. I kind of guessed it was 7, but I didn't know if there was something that I was missing since it is a little broad.

**Chemistry**

How many different f orbitals are there?

**Chemistry**

A metal foil has a threshold frequency of 5.45 x 10^14 Hz. Which color of visible light will not eject electrons from this metal? a) blue b) indigo c) violet d) orange c=(wavelength)(v) 3.0x10^8m/s = (wavelength)(5.45 x 10^14 Hz) 550 nm -> releases green. So, I am guessing ...

**Chemistry**

I am a little confused on how you got 5E-19 J

**Chemistry**

A 32 W (1 W = 1 J/s) lamp generates violet light at a wavelength of 420 nm. How many photons of this light will the lamp generate in 2.0 s?

**Proof by contradiction**

Prove that there exists no positive real number such that: 4x^2+1/4x <1 Can I simplify this inequality in the following way: multiply both sides by 4x so we have. 4x^2+1 <4x+1 Which renders the original statement false as 4x^2+1 cant be less than 4x+1. Even further can I...

**Deduction**

Hello, Struggling to get my head around this. So we have this statement. ----------------------------------- If it rains on Monday then mark will carry an umbrella on Monday. It does not rain on Monday. You deduce: Mark does not carry an umbrella on Monday...

**Social studies **

doctors during the civil war did not have a lot to work with what would you have done to change battlefield hospitals to make them better

**Economics**

Ms Sue you are the most useless person on this site

**Proof by contradiction **

Use proof by contradiction to show there is no real number x: 4x^2+1/4x <1

**Eigenvalues**

let the matrix A = (10 | 10 -4 | -3) Find the eigenvalues for A and for each find the corresponding eigenvector. Also express A in the form PDP^-1

**Mathematical Induction**

Use mathematical induction to prove that the following is true. 8+11+14...+(3n+5)=1/2n(3n+13), for all n in the set of natural numbers.

**Maths, dynamics**

a box slides under gravity down a flat slope 3 m long. Coefficient of sliding friction is 0.2. Show that the speed of the box at the bottom of the slope is given by sqrt(6g(sin - 0.2 cos) Thanks!

**Dynamics**

Hello, Is there a way to find the angle of inclination if given the coefficien of sliding friction? I've got 0.2 for the coefficient but I assume I can't use the old trick for find the angle give static friction I.e tan^-1 (u) = the angle.

**Mathematical Proof**

Hello everyone, Trying to get my head around deductions and the deductive step using my text book, could someone look over my work: Question: n+6 is odd if and only if 5n+1 is even. So my working, here it goes: n+6=2k+1 n=2k-5 thus 5n+1=5(2k-5)+1 =2(5k-12) so 5n+1 is even ...

**Chemistry**

You are approaching a stoplight. If the frequency of the light being emitted is approximately 520 THz, what was the wavelength of the light? What color was the light? v = c/? 520 THz --> 5.2x10^14 Hz 5.2x10^14 Hz = 3.0x10^8 m/s ? = 1.56 x 10^23 m Not sure how to get the ...

**Chemistry**

What is the energy of a photon in J emitted by the transition from the ni = 4 to the nf = 2 of a hydrogen atom?

**Math**

A college football coach wants to know if there is a correlation between his players' leg strength and the speed at which they can sprint 40 yards. He sets up the following test and records the data: Every day for a week, he counts how many times each player can leg press ...

**Chemistry**

I know, that is why I am confused choosing an answer.

**Chemistry**

The following ions contain three oxygen atoms: A) carbonate, sulfite, and nitrite B) sulfite, nitrate, and bromate C) sulfate, hypochlorite, and carbonate D) chlorate, iodate, and phosphite I know I can eliminate A and C.

**Chem**

Calculate the standard enthalpy change for the reaction: 2C8H18(l) + 17O2(g) --> 16CO(g) + 18H2O(l) Given: 2C8H18(l) + 25O2(g) --> 16CO2(g) + 18H2O(l): ?Hº = -11,020 kJ/mol 2CO(g) + O2(g) --> 2CO2(g): ?Hº = -566.0 kJ/mol

**Chemistry**

Calculate the amount of heat necessary to raise the temperature of 12.0 g of water from 15.4ºC to 93ºC. The specific heat of water = 4.18 J/gºC. q = ms?T q = (12.0g) (4.18) (93.0 - 15.4) q = 3892.416 J ??

**Chemistry**

Potassium is a reactive element. Bromine is a reactive element. Write the complete balanced chemical equation using appropriate chemical symbols for the reaction when potassium reacts with bromine to make a solid product showing correct symbols and states of reactants and ...

**Chemistry**

The enthalpy of combustion of benzoic acid (C6H5CO2H) is –3228 kJ/mol. The burning of 1.698 g of benzoic acid in a calorimeter causes the temperature to increase by 2.865 ºC. What is the heat capacity (in kJ/ºC) of the calorimeter?

**Chemistry**

Given H2(g) + (1/2)O2(g) --> H2O, ?Hº = -286 kJ/mol, determine the standard enthalpy change for the reaction 2H2O(l) --> 2H2(g) + O2(g). Just checking... should end up with ?Hº = 572 kJ/mol right??

**Chemistry**

Given ?Hºrxn = -1670 kJ/mol for 2Al(s) + (3/2)O2(g) --> Al2O3(s), determine ?Hº for the reaction 2Al2O3(s) --> 4Al(s) + 3O2(g). I flipped Al(s) + (3/2)O2(g) --> Al2O3(s) to Al2O3(s) --> A(g) + (3/2)O2(s) and multiplied the molar values by 2. I ended up ...

**Chemistry**

Yes, I meant answer C.

**Chemistry**

Which of the following processes is endothermic? a) H2O (g) --> H2O (l) b) 3O2 (g) + 2CH3OH(g) --> 2CO2(g) + 2H2O(g) c) H2O (s) --> H2O (l) d) O2(g) + 2H2(g) --> 2H2O(g) I a guessing b, since energy has to go into the reaction for water to go from a solid to a ...

**physics**

Two small balls are attached to a rigid rod of mass 2.2 kg that is 6.0 m in length. The first ball has a mass of 2.25 kg and the second ball has a mass of 4.95 kg. (c) What is the moment of inertia of the rod when it spins around its center of mass?

**Chemistry**

So, essentially .6164 kJ/g --> kJ/mol .6165/24.31 = .0254 kJ/g

**Chemistry**

When .1625 g of Magnesium is burned in a bomb container that has a heat capacity of 3.03 kJ/ºC, the temperature increases by 1.252 ºC. How much heat (kJ/mol) is liberated during the burning of magnesium? Just want to make sure I am doing this correctly: q = ms?T q...

**Chemistry**

Calculate the enthalpy of formation if 78.5 g of carbon dioxide in the following reaction: C(s) + H2O(g) --> CO2(g) Use the following equations: a) H2O(l) --> H2(g) + (1/2)O2(g): ?°f = +285.8 kJ/mol b) C2H6(g) --> 2C(s) + 3H2(g): ?°f = +84.7 kJ/mol c) 2CO2(g...

**Chemistry**

In which of the following reactions is work done by the system to the surroundings? A) 2CH3OH(l) + 3O2(g) --> 4H2O(l) + 2CO2(g) B) S(s, rhombic) + O2(g) --> SO2(g) C) 2AgNO3(s) --> 2AgNO2(s) + O2(g) D)4Fe(s) + 3O2(g) --> 2Fe2O3(s) My guess is B because according to...

**Chemistry**

Calculate the enthalpy of formation of carbon dioxide in the following reaction: C(s) + O2(g) -> CO2(g) Use the following equations: a) H2O(l) --> H2(g) + 1/2 O2(g): ?H° = +285.8 kJ/mol b) C2H6(g) --> 2C(s) + 3H2(g): ?H° = +84.7 kJ/mol c) 2CO2(g) + 3O2(g) --&...

**Math**

Yes, this is what I thought!! Im so confused unless this is a trick question.

**Math**

Which of the following equivalences is true? x^2 ? 0 ? (x+1)^2 ? 1 x^2 ? 0 ? x^2+1 ? 1 x > 0 ? x^2 > 0 x^2 > 0 ? x^2+1 ? 1 x ? 0 ? x^2 ? 0

**Maths, dynamics**

A particle moves such that its velocity at time t is given by v =5t^5i + 4t^5j + t^3k. If its position x at time t = 0 is given by x ( 0 ) = i + 2j, what is the position of the particle at time t?

**Maths, dynamics**

A particle of mass 45 kg moves in a straight line such that the force (in Newtons) acting on it at time t (in seconds) is given by 225t^4-90 t^2-225. If at time t = 0 its velocity, v , is given by v ( 0 ) = 2, and its position x (in m) is given by x ( 0 ) = 5, what is the ...

**Social Studies**

C D A

**Chemistry**

The enthalpy of combustion of butane C4H10 is described by the reaction: C4H10(g) + (13/2) O2(g) -> 4CO2(g) + 5H2O(g) ?H°rxn = –2613 kJ/mol Given the following enthalpies of formation: ?H°f[CO2(g)] = -393.5 kJ/mol ?H°f[H2O(g)] = -241.8 kJ/mol Calculate the ...

**Chemistry**

What is the final temperature when 180.0 mL water at 101.3 C is added to 93.1 mL of water at 65.5 C?

**Chemistry**

A gas expands its volume from 4.7 L to 8.9 L at constant temperature. Answer the following: a) If the gas expands against vacuum conditions, calculate the work (in joules) done by the gas. b) Calculate the work done (in joules) by the gas if it expands against a constant ...