Friday

July 11, 2014

July 11, 2014

Total # Posts: 70,327

**physics**

Calculate the water pressure at the bottom of the 50-m {\rm m}-high water tower shown in the photo. Express your answer to two significant figures and include the appropriate units

**physics**

Calculate the water pressure at the base of the Hoover Dam. The depth of water behind the dam is 220m m . Express your answer to two significant figures and include the appropriate units

**physics.**

Rank the following from most to least for the percentage of its volume above the water line: A. Basketball floating in saltwater B. Basketball floating in glycerin C. Basketball floating in gasoline

**Physics**

What is the energy of a single photon with a frequency of 7 x 10^8 Hz. (hint Planck's constant = 6.626 x 10^-34) To type an answer in scientific notation, use 'e'. For example, Planck's constant would be typed in as 6.626e-34.

**science**

2nd one is fossil fuels...

**science**

To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ polluti...

**chemistry**

what is the oxidation half-reaction in the following chemical reaction? fe(s) + 3 agno3 -> ag + fe(no3)3

**Science**

To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ polluti...

**math**

sue spends 2 1/4 hours taking inventory and 1 1/2 hour restocking. how many hours did she work

**Biology **

Which is the highest? Ecosystem population community

**Math**

How many years would it take a worker making $40 per hour to earn $8,000,000, assuming she works 240 8-hour days per year?

**Probability**

Can someone please answer?

**Probability**

Can someone please answer?

**Probability**

Can someone please answer?

**Probability**

Thanks

**Probability**

Can someone please answer?

**Probability**

Can someone please answer?

**CAN ANYONE HELP?**

I posted my science (chemistry) question and I have received no help and i really need to get this done so can someone please help??

**Chemistry quick question**

Ok and ill balance them thank u

**Chemistry quick question**

Could you write the chemical formulas and the reaction types and ill balance them cause it would be a great help

**Chemistry quick question**

I don't get how to write the chemical formulas its confusing and I'm stuck on this question for the past 2 hours and I need to get it done

**Chemistry quick question **

For the following write the chemical formulas for the reactants and predict the most likely reaction type , then write balanced equations for each: A.) magnesium chloride is heated b.) silver nitrate is reacted with sodium sulfide c.) methanol is burned in the presence of oxyg...

**Science (chemistry)**

I'm seriously stuck, and it's not like I want the answers, I have done all my other work but these are the questions that have made me stuck and ill really appreciate it if u could do them cause I have to hand this in or I won't be able to do the test tomorow

**Science (chemistry) **

Write a balanced chemical equation and state the reaction type for each of the following reactions: a.) nitrogen gas reacts with hydrogen gas forming ammonia (NH3) b.) carbonic acid breaks down to form carbon dioxide gas and water c.) aluminum foil reacts with copper II chlori...

**Chem- Ideal Gas Law**

Carbon dioxide can be made in the lab by the reaction of hydrochloric acid with calcium carbonate. How many milliliters of dry CO2 at 20.0 °C and 745 torr can be prepared from a mixture of 30.6 g of CaCO3 and 279 mL of 0.250 M HCl?

**Chemistry-Gases**

A mixture of gases is prepared from 76.9 g of O2 and 16.0 g of H2. After the reaction of O2 and H2 is complete, what is the total pressure of the mixture if its temperature is 178 ºC and its volume is 11.0 L? What are the partial pressures of the gases remaining in the mi...

**Chemistry-Gases**

A common laboratory preparation of hydrogen on a small scale uses the reaction of zinc with hydrochloric acid. Zinc chloride is the other product. (a) If 13.0 L of H2 at 765 torr and 20.0 °C is wanted, how many grams of zinc are needed, in theory? (b) If the acid is availa...

**slope**

What does the line y = 3x - 7 look like?

**economics**

how do you think our nations output should be distributed ? by income?

**A question**

May I ask why this site is called jiskha

**math**

Yes, now I got 2,087.04195

**math**

I got 0.342021?

**math**

Ms. Sue, how did u get 0.4167? Is it supposed to be 5?

**math**

Andrew borrows $79,500 for 5 months on 6.30% interest rate in his saving account. Calculate the simple interest?

**Finance**

Direct send-Single. Ocean Research of San Diego, California, just received a check in the amount of $800,000 from a customer in Bangor, Maine. If the firm processes the check in the normal manner, the funds will become available in 6 days. To speed up this process, the firm co...

**Math**

Parallel lines are on a ?-dimensiona; surface called a _____.

**Math help **

1. The number of students present in class & the number of empty chairs Type of correlation: Justification: Independent variable: Dependent variable: 2. Speed of car & distance traveled to complete stop after brakes are applied Type of correlation: Justification: Independent v...

**arithmetic**

Ana sees a computer that costs $1600. The store manager says next week will be on sale $350 less. What percent will Ana save

**english-poetry**

oh okay! thanks Ms. Sue !! :-)

**english-poetry**

what is a good haiku poem on the school cafeteria?

**trig**

Thanks a lot.

**trig**

Help! Ships A and B leave port at the same time and sail on straight paths making an angle of 60 degrees with each other. HOw far apart are the ships at the end of 1 hour if the speed of ship A is 25 km/h and that of ship B is 15 km/h?

**physics**

A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 70.0° at a speed of v1 = 2.50 m/s. It bounces off at an angle of θ2 = 63.0° and a speed of v2 = 2.10 m/s.

**Science**

An example of a renewable and inexhaustible resource that requires the construction of dams is _________________________ energy. hydroelectric

**Science**

Geothermal power would be classified as a(n) _____________________ resource because its supply will not run out. renewable

**math**

the current ratio of boys to girls at a certain school is 2 to 5 . if 12 additional boys were added to the school, the new ratio of boys to girls would be 4 to 9. how many boys currently attend the school?

**chemistry**

G=NEV

**math**

A product cost $100, 90% of the price being production cost,the remainder being tax, if the govt raises the tax by 50%, by how much in % will the factory have to reduce its production cost to keep he price still at $100

**Algebra**

What is the focus and directrix of the graph: x-3y^2=0?

**math**

Sam buys a lamp during the sale. There was a discount of 20%. If the original price is $4, what is the sale price?

**math**

A pen is marked down 40% from the original price. The original price was $50. What is the sale price before sales tax?

**SOCIALS, (Canada confederation)**

There is a reason why I posted this question because I read the book and it gives me NO information and I have already completed my other questions but these are the ones I have left

**SOCIALS, (Canada confederation)**

1. List in order of importance three ways the United States was a factor in the canadian Confederation. defend your choices with examples 2. explain the concept of manifest destiny. how much of a threat to British North America was the United States? 3. explain the "doubl...

**chemistry**

How you solve P4(s)+5O2(g)------>P4O10(g) .if 2.50 grams of phosphorus is ignited in a flask how many grams of P4O10 are formed ?

**Science**

In the temperature forest what are interactions with other organisms

**Science **

how does interdependence of organisms within an ecosystem aid survival in a temperate forest

**math**

Please help!pam is mixing 3 1/5 batches of paint.if one batch calls for 2 3/4 tablespoons of detergent to add to the tempura powder,how many tablespoons of detergent will pam need?

**world geography**

The statement, "People celebrate their birthdays on January 1st" is an example of what type of region?

**english**

How does an inclined plane impact work?

**Math**

Can u help me on this you have to convert inches into feet 1 inch = 8 feet and how do I do this with 2 1/4inches and also 1/10inches

**Chemistry**

a solution is prepared by dissolving 3.7500grams iron(III) oxalate in enough water to make 125.00mL of solution. 1. what is the molar concentration of iron(III) oxalate in this solution? 2. what is the molar concentration of oxalate ions in this solution?

**Chemistry**

a potassium dichromate is prepared by 0.3525grams of K2Cr2O7 is enough water to yield 250.0mL of solution. a student then measures 10.00mL of an unknown solution of Fe2+ into an erlenmeyer flask and dilutes with 90mL of 1.0M hydrochloric acid. she then titrates this sample wit...

**Physics**

The impulse given to a ball with mass of 4 kg is 16 N s. If the ball starts from rest, what is its final velocity?

**chemistry**

The molarity of an aqueous solution of barium hydroxide is determined by titration against a 0.335 M nitric acid solution. If 32.8 mL of the base are required to neutralize 21.5 mL of nitric acid, what is the molarity of the barium hydroxide solution?

**Math**

Convert 1-/10 1 inch=8 feet

**English**

Paper Bags — A Great Choice Am I supposed to use an em dash for the sentence above?

**English**

Metaphor for repugnance His biggest repugnance is guest who are always late

**Algebra Question~!**

The quadratic formula would also work here, right?

**geometry**

What is the vertex angle of an isosceles triangle with sides that measure of 22, 22, and 28 millimeters.

**English**

Metaphor for confusion The math problem was a maze at trying to solve.

**English**

Metaphor for repugnance His biggest repugnance is guest who are always late

**Math**

1. Mackenzie spent a lot of time on her project for Columbus Day. On Monday she worked for 2 hours and 33 minutes on making a poster. On Tuesday she worked for 1 hour and 28 minutes drawing a picture of Columbus. On Wednesday she spent two hours building a model of a Taino vil...

**biology**

Sperm cells are moved out of the testes in the

**Science**

A homeowner determined that he used 114 gallons of oil every month to heat his home during the winter. This information would be considered part of his carbon footprint. This one was hard for me too.

**Science**

this is homework help. Not do my homework help. please do your own work :)

**Science**

Is this for a science test?

**Science**

A______________________ is a tool used to capture the energy in sunlight. Recycling aluminum cans and taking shorter showers are two ways to practice the ________________________ of natural resources. Some plastics are made from corn. These plastics are biodegradable. This mea...

**English**

I need to write a metaphor for the word Repugnance. I definitely am lost on this one.

**chem Help**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.200 M and [NO]=0.500 M. N2 + O2= 2NO If more NO is added, bringing its concentration to 0.800 M, what will the final concentration of NO be after equilibrium is re-established?

**Math**

Did I get the average speed and nine days traveled correct

**Math**

6. Columbus' ships covered approximately 144 miles a day. How many miles would they have traveled in nine days? What was the average speed per hour? If there were two days when the weather did not permit movement, how many miles a day would they have to travel to make up t...

**calculus**

Twenty feet wire is used to make two figures? What is the maximum areas of enclosed figures.

**socials TO MS SUE OR ANYONE**

List the factors that supported the confederation in the canada colonies in the 1800s and the factors that went against the confederation in the colonies. PLEASE help ASAP!!!!

**statistics**

Survey on concern for criminal in a survey 3 of 4 students said the court show too much concern for criminals find the probability that 3 out of 7 randomly selected students will agree with this statement

**sociology**

5. Which evidence would best support the claim that prayer in school should be allowed? @This is a holistic problem answered by studying various aspects of chapter 2. (Points : 1)

**arithmetic**

Select the first five terms in the arithmetic sequence an = 4n, starting with n = 1.

**Chem Please Help**

Thanks!

**Chem Please Help**

If a 2.30 M sample of A is heated to 500 K, what is the concentration of B at equilibrium? A<-> 2B Kc= 5.04x10^-6 at 500k

**math**

When I am rounded to the nearest ten I am 40 the sum of my digits is 8 what two numbers can I be

**Programing**

Write a full program that reads in an arbitrary sequence of integers from the standard input, and writes them to the standard output in sorted order and with all duplicates removed. You may assume the input contains at most 100 integers . What I have is #include<iostream>...

**Programing**

Given two 3x3 arrays of integer , x1 and x2 , write the code needed to copy every value from x1 to its corresponding element in x2 . So far I have void main() { int x[3][3]; for(i=0; i<x1, i++) { for(j=0; j<x2, i++) { x[i][j]=i; cout<<x[i][j]<<" "; ...

**physics**

The figure below shows a claw hammer being used to pull a nail out of a horizontal board where θ = 32.2°. The mass of the hammer is 1.00 kg. A force of 125 N is exerted horizontally as shown, and the nail does not yet move relative to the board. Assume the force the h...

**Physics**

What element results if two protons and two neutrons are ejected from a radium nucleus?

**college physics 2**

A healthy astronaut's heart rate is 60 beats/min. Flight doctors on Earth can monitor an astronaut's vital signs remotely while in flight. How fast would an astronaut be flying away from Earth if the doctor measured her having a heart rate of 28 beats/min?

**Science URGENT**

He said he's not giving us the answers and I really need to check my answers all the time but I can't cause the answers don't come with the textbook. And I don't find it fair cause our math text books have the answers so why don't our science texts? But any...

**Science URGENT**

Ignore this question

**Science URGENT**

Is there any website or any way I can get the science probe 10 check your understanding answers cause I want to check my answers?

**math**

Find the percent if discount when the regular price for a DVD recorder is $250 and its sale price is $175

**Science**

The text book is called BC science probe 10 It's for grade 10

**Science**

Is there any website or any way I can get the science probe 10 check your understanding answers cause I want to check my answers?

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