Wednesday

September 28, 2016
Total # Posts: 777

**Physics .. hard problem**

An overly eager physics student wants to confirm that the acceleration of gravity is ag=9.8 m/s^2. To check this, the student steps off the roof of the Sears Tower (height at the sky deck 427m). The rocketeer (who arrived five seconds after the student stepped off) uses a ...

*September 27, 2016*

**Physics**

A 2.83-kg object is thrown vertically upward from the surface of Mars, where the acceleration due to gravity is g1 = 3.71 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of v2...

*September 26, 2016*

**Physics**

On the Moon, the acceleration due to gravity is 1.62 m/s2. How far would a 13 g rock fall from rest in 5.5 seconds if the only force acting on it was the gravitational force due to the Moon?

*September 26, 2016*

**Physics **

While standing at the edge of the roof of a building, you throw a stone upward with an initial speed of 6.11 m/s. The stone subsequently falls to the ground, which is 12.7 m below the point where the stone leaves your hand. At what speed does the stone impact the ground? How ...

*September 26, 2016*

**Social study **

2 down another name for mississippians

*August 25, 2016*

**Chemistry **

For the following reaction, how many kJ of heat are produceed in forming 225.0 g of NO? 4 NH3 + 5 O2 → 4 NO + 6 H2O ΔHrxn = -906 kJ/mole

*July 6, 2016*

**Government**

Thank you for your help

*July 4, 2016*

**Government**

1. Not all resolutions need presidential approval, as do bills becoming laws. True False I think the answer is true because there are certain resolutions like joint and concurrent resolutions and joint require presidential approval while concurrent does not. Is my answer ...

*July 4, 2016*

**Science : Physics**

Will an object accelerate if the forces are balanced? Why or why not? I know that the answer is that it will not accelerate but I'm having a difficult time explaining why.

*June 17, 2016*

**Science : Physics**

A 15kg object takes 26.3 meters to stop because of friction. Assume no skidding. If the frictional force is 60 N, what is the initial velocity of the object?

*June 17, 2016*

**Science**

A force of 32.3 N is applied to a 5.87 N box resting on a table. If friction acts with a force of 2.11 N, what is the acceleration of the box?

*June 2, 2016*

**Chemistry**

What mass of solid magnesium hydroxide is needed to neutralize .385 L of 2.5 M nitric acid?

*May 22, 2016*

**Chemistry**

What is the concentration of 127 mL of solution made with .450 g of nickel (II) nitrate hexahydrate?

*May 22, 2016*

**English**

Thank you so much! I had trouble with this in class, but I understand it better now

*May 20, 2016*

**English**

is 1 a and 3 B?

*May 20, 2016*

**English**

Select the correct verb tense used in the sentences below That company has been making surfboards since the 1960's present perfect progressive present progressive*** past perfect progressive past progressive We had been listening to the radio when the lights went out past ...

*May 20, 2016*

**English**

thanks!!

*May 20, 2016*

**English**

Are 2 and 5 D?

*May 20, 2016*

**English**

Choose the correct tense of the underlined verb Everyone in the climbing expedition /developed/ frostbite from their exposure to the cold past perfect future present past*** This recipe /will produce/ two dozen chocolate chip cookies past future perfect*** present future That ...

*May 20, 2016*

**English**

thanks!

*May 20, 2016*

**English**

Is number 3 A?

*May 20, 2016*

**English**

Choose the past form or the past participle for the underlined verb We /sell/ dozens of magazine subscriptions last week sold*** selled have selled no error Until this morning, they /kept/ the secrete to themselves keep keeped keeping no error*** The United states has /lead/ ...

*May 20, 2016*

**math**

Two particles A and B of mass 5kg and 9kg respectively rests on the smooth faces of a fixed wedge .They are connected by a light inextensible string passing over a smooth pulley at C and are released from rest.In the subsequent motion B hits the ground and does not rebound. a...

*April 23, 2016*

**Algebra**

there should be a 1 red diamond card in the deck. so the probability will be 1 out of 52 cards

*April 22, 2016*

**math**

haley drew a scale drawing of a city. A neighborhood Park, which is 70 yards wide in the real life, is 175 inches wide in the drawing. What is the scale of the drawing

*April 21, 2016*

**math**

use pemdas

*April 21, 2016*

**Math**

is 2/3 larger than 4/7

*April 7, 2016*

**Math**

Consumer Reports indicated that the average life of a refrigerator is 13 years with a standard deviation of 2.5 years. (Assume the distribution of the age of the refrigerators is approximately normal.)

*March 28, 2016*

**Math**

Suppose that a company guarantees refrigerators and will replace with a new one that breaks while it is under the guarantee. However, the company does not want to replace more than 5% of the refrigerators under the guarantee. For how long should the guarantee be made? You can ...

*March 28, 2016*

**Math**

Suppose that a company guarantees refrigerators and will replace with a new one that breaks while it is under the guarantee. However, the company does not want to replace more than 5% of the refrigerators under the guarantee. For how long should the guarantee be made? You can ...

*March 28, 2016*

**physics**

Freshwater (𝜌 = 1,020 kg/m3) is flowing in a horizontal pipe whose cross section widens from 9.0 cm2 to 13.0 cm2. The water speed at the wide section of the pipe is 1.25 m/s. What pressure difference (absolute value) is there between narrow and wide section?

*March 26, 2016*

**Trigonometry **

5. Prove: Tan beta sin beta + cos beta = sec beta 6. Prove: ( tan y cos^2 y + sin^2 y)/ (sin y) = cos y+sin y 7. Prove (1+tan theta)/(1-tan theta) = (sec^2+2tan theta) /(1-tan^2 theta)

*March 10, 2016*

**Trigonometry **

5. Prove: Tan beta sin beta + cos beta = sec beta 6. Prove: ( tan y cos^2 y + sin^2 y)/ (sin y) = cos y+sin y 7. Prove (1+tan theta)/(1-tan theta) = (sec^2+2tan theta) /(1-tan^2 theta)

*March 9, 2016*

**Math**

25,344ft. is your answer :)

*February 2, 2016*

**Can someone help me on math?**

You just asked this same question and I already answered it. $2,000.00 at 6% for 7 years *** b. $4,500.00 at 3% for 6 years *** c. $1,400.00 at 6% for 9 years d. $5,000,00 at 7% for 3 years *** e. $800.00 at 15% for 5 years Calculate the tax for each pair of shoes with the ...

*February 1, 2016*

**More math**

a,b, and d Simple interest is just p x r x t

*February 1, 2016*

**philosophy**

Russell is arguing that philosophy is valuable. You'll want to think about his argument using his own key ideas: •How does he think philosophy is different from science? •Does he think philosophy is different from science in a good or bad sense, like one is ...

*January 17, 2016*

**SCIENCEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE**

hey guys be a little nicer please she was just asking for help

*January 13, 2016*

**Math ASAP**

Order the numbers from least to greatest. 0.21, 1/5, 0.18, 24% a. 0.21, 1/5, 0.18, 24% b. 24%, 0.21, 1/5, 0.18 c. 0.18, 1/5, 0.21, 24% d. 1/5, 0.18, 0.21, 24% ** Am I right? I don't know. Please help! Thanks so much!

*January 11, 2016*

**Chemistry**

A buffer solution contains 0.052 M HC2H3O2 and 0.025 M NaC2H3O2. The pH of this solution is _____. Ka for HC2H3O2 is 1.8x10-5.

*December 1, 2015*

**Algebra**

One number is 58 more than twice another. Their product is 58 more than twice their sum. Find the numbers.

*November 23, 2015*

**World History**

what is the social position of a merchant in both Christian and Islamic worlds.

*November 19, 2015*

**Statistics**

CI=point estimate +- (z)(standard deviation) CI= 0.3 +- (1.96)(0.04) CI= 0.3 +- 0.0784 CI= 0.3 - 0.0784 CI= 0.3 + 0.0784 CI= (0.2216, 0.3784)

*November 10, 2015*

**Statistics**

We observe a sample proprotion p-hat = 0.3. If the standard deviation of the sampling distribution of p-hat is 0.04, what is the 95% confidence interval for p?

*November 10, 2015*

**chemistry**

Assume that 268mL of 5.00M NaOH are diluted to a final volume of 574mL with water. What is the final molarity of NaOH (FM=40.0).

*November 8, 2015*

**math**

A runner and a walker depart from the same point going in opposite directions on a circular track that is 1 mile long. The runner travels at 9 mph and the walker at 3 mph. After how many minutes will they pass each other? I know the answer is 5 but I don't know how to get it

*November 5, 2015*

**math**

A runner and a walker depart from the same point going in opposite directions on a circular track that is 1 mile long. The runner travels at 9 mph and the walker at 3 mph. After how many minutes will they pass each other? I know the answer is 5 but I don't know how to get it

*November 5, 2015*

**Jackie Carden**

Mr Snyder is tiling a floor. The floor is 16 tiles long and 9 tiles wide. The center section is 12x long and 5 tiles wide. How many tiles are in the border section?

*October 19, 2015*

**World History**

Can someone please help me answer this question Historians traditionally date the end of the Roman Empire to 476 AD. Why is this? Is this a good date to use for the end of Rome? Why or why not? Does this date adequately capture the end of the socalled “Greco...

*October 11, 2015*

**World History**

Can someone please help me found out the answer to this question. Discuss the relationship between inequality and war from the time of the earliest cities (roughly 4000 BC) to the end of the Bronze Age (roughly 1200 BC). You may consider any form of inequality in any group of ...

*October 11, 2015*

**Chemistry**

The strontium-87 isotopes stores in the body and decays by the process shown below. The half-life is 2.80hr. Suppose that 0.766 millicuries got into the body. How many mc will remain after 8.40 hr?

*September 27, 2015*

**Chemistry**

The strontium-90 isotope decays by the reaction below. It has a half-life of 28 yr. If the initial activity of this isotope was 168dpm, what would the activity be after 28.0 yr?

*September 27, 2015*

**math**

In jims,5 times as many students take the bus as those who walk. A total of 24 students walk or take the bus. How many more students take the bus than walk to school?

*September 22, 2015*

**Science**

How do I write the correct dissolution reaction for BaCl2

*September 16, 2015*

**Chemistry**

Which of the following shows the correct dissolution reaction for BaCl2?

*September 16, 2015*

**science**

Based on the oxidation numbers which compound is the oxidizing agent in the following reaction? 8Al + 3KClO4 ¨ 4Al2O3 + 3KCl

*September 7, 2015*

**Chemistry**

determine the molarity of a solution of silver nitrate prepared by dissolving 5g of silver nitrate in 25.0mL of water

*September 1, 2015*

**Math**

Customers of a phone company can choose between two service plans for long distance calls. The first plan has a $14 monthly fee and charges an additional $0.20 for each minute of calls. The second plan has an $18 monthly fee and charges an additional $0.15 for each minute of ...

*July 25, 2015*

**Psychology**

you tell me, cause i honestly don't know

*July 6, 2015*

**pre calculus **

32% of a particular radioactive substance disappears in 227 years. Part 1: Find the decay constant. Your answer must be correct to five decimal places. Part 2: Determine the time T in years required for 93% of the substance to disapper. Your answer must be correct to two ...

*July 6, 2015*

**Science Help Plzz**

These are the rights seers for the connexus people D B A A C C B D A A D B C D

*June 2, 2015*

**geometry**

Does pi cancel when I add 48ƒÎã2 + 36ƒÎ ?

*May 11, 2015*

**Pre-Ap Chemistry**

This is my last question and this one really threw me for a loop. I know that the temp has to be converted to kelvin which would make it 315.4 What volume of oxygen gas can be collected at 0.683 atm pressure and 34.0◦C when 42.4g of KClO3 decompose by heating, according ...

*May 8, 2015*

**Pre-Ap Chemistry**

This is due online in 20 minutes and I've been working on it for 3 hours. Im lost on what to do with this question. Please help How much H2 gas at STP can be produced by the reaction 2Na(s) + 2H2O(§¤) -> H2(g) + 2NaOH(aq) of 3.80 g of Na and excess water? ...

*May 8, 2015*

**CHEMISTRY**

264.6666666667 :) thanks!

*May 8, 2015*

**CHEMISTRY**

Nitric acid can be produced by the reaction of gaseous nitrogen dioxide with water. 3NO2(g) + H2O(§¤) −> 2HNO3(§¤) + NO(g) If 794 L of NO2 gas react with water, what volume of NO gas will be produced? Assume the gases are measured under the ...

*May 8, 2015*

**THIS IS DUE BY 10PM**

it said that it was wrong

*May 8, 2015*

**THIS IS DUE BY 10PM**

so then would it be (22.4)(.0821)(316.0) divided by 1.09? which is ultimately 534.671

*May 8, 2015*

**THIS IS DUE BY 10PM**

YES(:

*May 8, 2015*

**THIS IS DUE BY 10PM**

What is the volume of 0.100 g of C2H2F4 vapor at 1.09 atm and 43.9◦C? Answer in units of L

*May 8, 2015*

**science**

are you from connexus and if you are what grade

*May 4, 2015*

**Chemistry**

Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+

*April 29, 2015*

**Chemistry**

Calculate the pH of the resulting solution if 50 cm3 of 0.045mol dm-3 solution of C5H5N is mixed with 100 cm3 of 0.035 mol dm-3 of C5H5NH+

*April 29, 2015*

**Math**

We write at the same time again. LOL

*April 16, 2015*

**Math**

Thank you

*April 16, 2015*

**Math**

I know I said it was C now.

*April 16, 2015*

**Math**

The answer is C.

*April 16, 2015*

**Math**

Yea but on my paper it doesn't say it like it does on the previous questions so I kind of got confused.

*April 16, 2015*

**Math**

Determine whether this sequence is arithmetic or geometric. Find the next three terms. 4. 3, 12, 21, 30, .... A.40, 50, 60 B.38, 46, 54 C.39, 48, 57 D.36, 32, 39 A? Thank you

*April 16, 2015*

**Math**

Thank you sooooooo much Irving.

*April 16, 2015*

**Math**

Determine whether this sequence is arithmetic or geometric. Find the next three terms. 81, 27, 9, 3, . . . A. arithmetic, 0, –3, –6 B. geometric, 0, –3, –6 C. geometric, 1,1/3 , 1/9 D. The sequence is neither geometric nor arithmetic. Is the answer C? Thank...

*April 16, 2015*

**Math**

lol I didn't even notice. Thanks.

*April 16, 2015*

**Math**

Thank you again sooooooooooooo much. You are a great help!:) Your really smart.

*April 16, 2015*

**Math**

Determine whether each sequence is arithmetic or geometric. Find the next three terms. -4,8,-16,32... A. Arithmetic, 64,128,256 B. Geometric, -64,128,-256 C. Geometric, -48,64,-80 D. The sequence is neither arithmetic nor geometric sequence. B? Thank you

*April 16, 2015*

**Math**

But a geometric sequence is when you times it and arithmetic is when you add it. So the answer has to be C, because C answer and A's answer are the same except arithmetic is the right answer.

*April 16, 2015*

**Math**

Determine whether each sequence is arithmetic of geometric. Find the next three terms. 14,19,24,29.... A. Geometric,34,39,44 B. Arithmetic,32,36,41 C. Arithmetic, 34,39,44 D. This sequence is neither arithmetic or geometric. Is the answer C? Thank you

*April 16, 2015*

**math**

Task is to construct two brick columns of the dimensions shown on which an iron gate will eventually be hung. Because the bricks measure 8" long by 3 1/2" wide by 2 1/2" high. How many rows of bricks will it take to complete each column?

*April 15, 2015*

**geometry**

State whether the following numbers make a right triangle and a Pythagorean triple: 2, 2 root 2, and 2 root 3 I am pretty sure that both answers are no, because 2 squared and 2 root 2 squared equal 8, whereas 2 root 3 squared equals 6, so it cannot form a right triangle or ...

*April 4, 2015*

**Science**

@oompoolmpa do you remember the rest of the answers?...

*March 23, 2015*

**grammer**

Even in Hollywood, there was a “blacklist” of entertainment figures that should not be hired because they were suspect for their role in support in communism. I believe this sentence is confusing with the use of should. Do you agree? If so, what word or words should ...

*March 17, 2015*

**chemistry **

What is the strongest intermolecular force that occurs between carbon dioxide molecules? A. London dispersion forces B. Hydrogen bond C. Covalent bond D. Dipole-induced dipole attractions I think the answer is D but I am not sure

*March 13, 2015*

**Chemistry **

The reason that nonpolar oil will not dissolve in polar water is that the attractive forces between: A. the oil molecules are ionic and the attractive forces between the water molecules are covalent. B. the water molecules are weaker than the attractive forces between the ...

*March 13, 2015*

**chemistry**

Please help me with the last one

*March 12, 2015*

**chemistry**

b. Gibbs Free Energy can either be negative when a chemical reaction is spontaneous or positive when a chemical reaction is nonspontaneous. When a chemical reaction is reversed, it can either go from spontaneous to nonspontaneous or the other way around. This means that the ...

*March 12, 2015*

**chemistry**

a. When a reaction thermodynamically favorable, it will be a spontaneous reaction as well as release energy. Gibbs Free energy is the amount of energy needed for a reaction to take place. If the Gibbs Free energy is negative that means that the reaction does not need an impute...

*March 12, 2015*

**chemistry **

a) Describe how to determine if a reaction will be thermodynamically favorable. b) Describe what happens to the Gibbs Free Energy term when a chemical reaction is reversed. c) Describe how coupling reactions are used to drive an unfavorable chemical reaction.

*March 12, 2015*

**chemistry **

Explain how the geometry affects the ability of the molecules to experience a dipole affect. One molecule is a trigonal pyramidal while the other is a tetrahedral.

*March 12, 2015*

**Chemistry **

what is the VSEPR of NF4+

*March 12, 2015*

**chemistry **

In 3-4 sentences, identify how the geometric structure of NF3 is different than that of NF4+. Explain how the geometry affects the ability of the molecules to experience a dipole affect.

*March 6, 2015*

**LSU**

A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.53 x 104 m/s, and the radius of the orbit is 3.42 x 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 9.28 ...

*March 6, 2015*