Tuesday

January 17, 2017
Total # Posts: 800

**chemistry!!!!!!!!!**

at 20°C the concentration of O2 in the air is 8.65 x10-3 mol/L. what us the minimum volume of air in litres that are required to completely combust on e litre of gasoline at 20°C? Assume the gasoline is octane which has a density of .703 g/mol at this temperature. The ...

*October 19, 2015*

**Physics**

At t=0 a particle leaves the origin with a velocity of 5.0 m/s in the positive y direction, its acceleration is given by a=3i-2j m/s^2 At the instant the particle reaches its maximum y coordinate, how far is it from the origin? I'm not sure how to do a question like this, ...

*October 17, 2015*

**science**

I have a question from an old exam that I need help to understand, i'm not sure where to start An electron in an electronically excited hydrogen atom undergoes a transition from a 6d to a 2p orbital, resulting in the emission of a photon. The photon strikes a metal surface...

*October 16, 2015*

**Chemistry**

I have a metal sheet of indium, and when a uv light with a wavelength of 265 nm is shone on it the surface ejects electrons that have a kinetic energy of 8.31x10^-20 J per ejected electron. I'm asked to find the threshold frequency, I need to know how to find it.

*October 14, 2015*

**chemistry**

Mercury and gallium

*October 14, 2015*

**science**

The concentration of sodium chloride in ocean water is on average 0.060 M. What mass of sodium chloride is present in 25 L of ocean water? How do I answer this question, I have no idea where even to start.

*October 14, 2015*

**biology**

why is anaphase the shortest stage in the cell cycle?

*October 14, 2015*

**Algebra**

a). The length of the classroom is 30 ft. The length of the room on the scale drawing is 6 in. Is this correct? Explain why or why not. Michael has made a scale drawing of his classroom. The scale for his drawing is 0.5 in. : 3 ft. b). One of the student tables is 6 ft long. ...

*October 4, 2015*

**Social Stuides**

I forgot to include my URL's, sorry. (Use website prntscr dot com) 8lje58 And 8ljefd

*September 28, 2015*

**Social Stuides**

Write a paragraph telling how each excerpt below reflects U.S. values and the conflicts between ideals and reality.

*September 28, 2015*

**Physics**

Using GRAPHICAL METHOD, find the vector sum of a force of 20 N directed 60 degrees east of north and a force of 60 N directed west? Please show all steps and equations used.

*September 19, 2015*

**Physics**

"a vector r has a magnitude of 18 units and makes a 30 degree angle with respect to the x axis. find the vector components of r using a protractor and some graph paper to verify your answer by drawing r and measuring the length of the lines representing its components.&...

*September 14, 2015*

**Physics**

An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time, the y component of the velocity versus time and the y component of the acceleration ...

*September 11, 2015*

**Physics**

An object travels with a constant acceleration for 10 s. The vectors in Figure 3-41 represent the final and initial velocities. carefully graph the x component of the velocity versus time and the y component of the acceleration versus time, in a Vx vs t graph, a Vy vs t graph ...

*September 11, 2015*

**Algebra**

A Car is moving at an average speed of 60 km/h. Find the algebraic expression for the kilometer it would travel in y minutes. Comment on this question: Hello, for me, algebra is one of the hardest subjects at school. Most of the time I read a question over and over again but I...

*September 4, 2015*

**Physics**

A black mamba snake has a length of 4.3 m and a top speed of 8.9 m/s! Suppose a mongoose and a black mamba find themselves nose to nose. In an effort to escape, the snake accelerates at 20 m/s2 from rest. (a) How much time does it take for the snake to reach its top speed? (b...

*August 29, 2015*

**Physics**

A jet takes off from SFO (San Francisco, CA) and flies to YUL (Montréal, Quebec). The distance between the airports is 4100 km. After a 0.81-h layover, the jet returns to San Francisco. The total time for the round-trip (including the layover) is 13.9 h. If the ...

*August 29, 2015*

**Physics**

A Bugatti Veyron 16.4 can accelerate from 0 to 60 mi/h in 2.4 s. The Saleen S7 Twin Turbo goes "from 0 to 60" in 2.8 s. Determine the distance that the Bugatti Veyron would travel in the time it takes to reach 75 km/h, the speed limit on many Canadian roads. Compare ...

*August 29, 2015*

**Math**

Deshawn and Luke had an equal number of stickers. After Deshawn used 26 stickers and Luke lost 38 stickers,Deshawn had twice as many stickers as Luke. How many stickers did each of them have?

*August 26, 2015*

**math**

Find the simple interest and the final value of the deposit that earns the given rate for the indicated length of time. Round your answers to the nearest cent. $8439 earning 8% for 1.4 years ?

*August 5, 2015*

**math**

The cost C in dollars of having an electrician come to your house to do a repair job in h hours if he charges $16 for coming to the house and $30 for each hour.

*August 5, 2015*

**Mathematics**

I subtracted the $320.09 by $11.20 but I wasn't sure so I added all the deductions and subtracted that by the $320.09..

*August 5, 2015*

**math**

I think it is c.

*June 20, 2015*

**math**

4d(2d-9) a.) 8d-36d b.) -d c.) -28d^2 d.) 8d^2-36d

*June 20, 2015*

**math**

-3m(m+8) a.) -3m^2 + 24 b.) 3m^2 - 24m c.) -24m^2 d.) -4m + 5

*June 20, 2015*

**math**

1. (9m + 6) + (–5m – 6) 4m + 12 14m + 12 14m – 12 4m 2. (3r^2 + 7r + 1) + (4r^2 – 8r – 2) 7r2 + 15r – 1 7r2 – r – 1 7r2 – 15r – 3 –r2 – r – 1 3. (6h + 1) – (9h + 4) –3h – 3 15h – 5 –3h + ...

*June 1, 2015*

**grammar**

Which best describes the underlined group of words? Then it was time for Karla, my sister's best friend, to fly home. my sisters best friend is underlined A. adverb phrase B. misplaced modifier C. appositive phrase D. adjective phrase i think its c

*May 28, 2015*

**science**

An electric stove transfers heat too a pot by a.) conduction b.) convection c.) radiation d.) friction

*May 21, 2015*

**math**

8000+695832=

*May 20, 2015*

**math**

what is 3256/9

*May 11, 2015*

**Math**

A bag of five apples contains three ripe apples and two rotten apples. If a ripe apple is selected first, what is the probability that a second apple selected is rotten?

*May 9, 2015*

**Math**

Is this independent or not. Carlos tosses a coin that comes up heads. Jennifer tosses a coin that also come up heads.

*May 9, 2015*

**Math**

Math: Is this statement independent or not. Jordan stayed up late last night watching television. Jordan did poorly in his quiz in the morning.

*May 9, 2015*

**Chemistry**

Is Dr. Bob saying No/N=Kt After finding the constant (1.38?)=k 100/25=1.38t 4=1.38t 2.89=t ???? That's what I got and it doesn't seem right to me.

*May 8, 2015*

**Math**

How do I figure out what quadrilateral has 90 90 125 65 digrees on each side?

*May 7, 2015*

**math**

If you roll a pair of number cubes 50 times, what would be the experimental probability of P(odd and odd)

*May 4, 2015*

**science**

hello

*May 4, 2015*

**science**

hey is there anybody to talk to out there like ms sue

*May 4, 2015*

**math**

hello

*May 1, 2015*

**math**

hello can i talk to you

*May 1, 2015*

**math**

hey ms sue can i talk to you

*May 1, 2015*

**math**

hello

*May 1, 2015*

**math**

what is 3,563-3,957

*May 1, 2015*

**math**

what is 236?/3

*May 1, 2015*

**math**

what is 3,563- 3,957

*May 1, 2015*

**math**

thanks you so much i made a 100.

*May 1, 2015*

**math**

what is 630/3

*May 1, 2015*

**math**

can any one help me?????????????????????????

*May 1, 2015*

**math**

60 people are coming to a event. 7 rows of seats. 8 seats in each row. what does the p represent?

*May 1, 2015*

**Pre-Calc**

I am really struggling with how to do these problems, I posted them a few minutes ago but the answers/work shown was incorrect. 1) a) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin ...

*April 13, 2015*

**Pre-Calc**

Thank you so much but are those the expressions or exact answers for the first two problems?

*April 13, 2015*

**Pre-Calc**

1) Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos 12° cos 18° − sin 12° sin 18° And Find its exact value. 2) Use an Addition or Subtraction Formula to write the expression as a trigonometric ...

*April 13, 2015*

**chemistry**

I have to do a lab on equilibrium, where you have to transfer water with two different sized straws, and answer questions based on that the questions are about the significance of where there is a flat line on the graph, and the significance of the point where the two lines ...

*March 19, 2015*

**chemistry**

Thank you so much!!

*March 16, 2015*

**chemistry**

I need an example of an elementary reaction to go with the definition An elementary reaction is a reaction in which reactants are converted to products in a single step.

*March 16, 2015*

**Chemistry**

for a project i had to make cards with words and then an example of those words, and i've done almost all of them, but I have a few words I need examples for activation energy activation energy activated complex elementary reaction

*March 16, 2015*

**Math (Pre-Calc)**

Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that ∠A1 is smaller than ∠A2.) b = 74, c = 84, ∠B = 58&...

*March 13, 2015*

**Pre-Calculus**

I posted this question about an hour ago, got a response but still confused. Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers ...

*March 13, 2015*

**Pre-Calculus**

Thank you so much! I am just trying to figure out how to solve for b1. I am confused as to how you got the 1 and why you used 0.01851 when you said to use the two values for B to get B (the two values are 88.26 and 13.74)

*March 13, 2015*

**Pre-Calculus**

Use the Law of Sines to solve for all possible triangles that satisfy the given conditions. (If an answer does not exist, enter DNE. Round your answers to one decimal place. Below, enter your answers so that ∠B1 is smaller than ∠B2.) a = 34, c = 43, ∠A = 39&...

*March 13, 2015*

**algebra**

Ed Moura has $21000 invested in stocks paying 8%. How much additional money should he invest in certificates of deposit paying 4% so that the average return on the two investments is 5%?

*March 12, 2015*

**chemistry**

In the reaction O2+2NO->2NO2 what is the ratio of oxygen reacted to nitrogen dioxide produced? Nitrogen monoxide to nitrogen dioxide? We had to calculate the concentration of each, for which I have O2=-1.01x10^-5, NO=-2.03x10^-5 and NO2=2.04x10^-5. I'm not sure how to ...

*March 12, 2015*

**chemistry**

if the concentration of all the reactants doubled, what works happen to the rate I know the reaction rate would increase, but in a previous example it asked the question and the answer was that the rate increases by 16 and I can't figure out how much it would increase for ...

*March 10, 2015*

**math 11**

Paula lent Ned $1200 to help him pay for a mountain bike that he desperately wants. She charged him 8%/a simple interest, payable weekly. Ned paid back the loan plus interest, in equal payments over 20 weeks. a) How much interest will Ned have to pay? [2 marks] b) What will ...

*March 4, 2015*

**math**

May Ling borrowed $2500.00 for vehicle repairs from her parents. She agreed to pay back the loan plus 7.5% simple interest on the $2500 added on in equal monthly payments over the next 6 months. a) How much interest will May Ling have to pay? [2 marks] Monthly rate = ...

*March 4, 2015*

**Physics**

Analyze the flight of a projectile moving under the influence of gravity (mg) and linear, i.e., laminar- flow drag (fD = bv, with b > 0 constant). Neglect \Phase I"; assume the projectile is launched from the origin at speed v1 and angle 1 above the horizontal. WARNING...

*March 2, 2015*

**Science**

You have a block of ice with a mass of 6.12 . The volume of the water is 100L and the volume of water when the ice is in the water is 106.66L. I subtracted 100.00 and 106.66 to get 6.66L as the volume of the ice What I'm confused about is how to divide 6.12 by 6.66 in long...

*February 23, 2015*

**science(sound#4)**

I don't understand it and I don't have any choices.

*February 18, 2015*

**science(sound#4)**

What instrument has a low pitch?

*February 18, 2015*

**science(waves)**

What do waves transfer?

*February 18, 2015*

**science(sound #3)**

Space has no air, what is another name for no air?

*February 18, 2015*

**science (sound #2)**

What temperature makes sound travel slower?

*February 18, 2015*

**science (sound)**

Okay thank you so much.

*February 18, 2015*

**science (sound)**

what temperature makes sound travel faster?

*February 18, 2015*

**science (aka sound)**

What are the 3 things that a medium can be in sound?

*February 18, 2015*

**science**

solid liquid gas

*February 18, 2015*

**science**

What are the 3 things that a medium can be?

*February 18, 2015*

**Math**

6 ounces

*February 18, 2015*

**chemistry**

What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. The pairs with similar colours were Ba2+ and Cu2+, and Sr2+ and Li+. Ba and Cu had light green-ish colours, and Sr and Li had red colours. I don&#...

*February 17, 2015*

**math**

A scale drawing of a city has a scale of 3 inches : 400 feet. What is the actual length of each foot in the drawing? Show the work.

*February 14, 2015*

**chemistry**

Which region of the color spectrum does 14 x 10^16 exist in? I can't figure out this question but I got all the others

*February 9, 2015*

**Social studies**

how did northern and southern responses to the fugitive slave law affect their relationship? A.it deepened on fear and anger B.it deepened the commitment to compromise C.it encouraged northern commitment to end plantation life D.it encourage southern commitment to expand ...

*January 29, 2015*

**Math**

PLEASE SHOW YOUR WORK OR EXPLAIN... Mr. Webb gave his waiter a $5.60 tip on a $40 bill. What percent tip did he give the waiter?

*January 21, 2015*

**Math**

PLEASE SHOW YOUR WORK.. Marty paid $72 for a jacket that had been marked down 20%. Create a linear model to represent this and use it to calculate the original price of the jacket.

*January 21, 2015*

**Math**

!!PLEASE SHOW YOUR WORK!! My recipe makes 96 cookies, but I'll only need 24 for the party, what will I multiply each ingredient by to make just 24 cookies? Explain.

*January 21, 2015*

**math**

Sin theta equals 5/12 in quadrant, find the exact value of cos 2theta. I'm not sure how to solve this question, I need some help.

*January 16, 2015*

**math**

rodeo performer spins a lasso in a circle perpendicular to the ground. the circle has a diameter of 118cm. she starts with the knot at the lowest point which is at 90 cm above the ground, she spins the lasso and .5 seconds later the knot is at the highest point. 1.what is the ...

*January 16, 2015*

**math**

how do you find the area of 7.3+13=?

*January 13, 2015*

**Math**

A search on colony of bacteria triples and links every 10 minutes it's links is now 1 mm how long will it be in 40 minutes?

*January 7, 2015*

**Physics**

A place kicker must kick a football from a point 33.0 m (about 36 yd) from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 48◦ to the horizontal. To...

*January 2, 2015*

**Physics**

a 1000 kg space craft at 500 m/s is on a collision course with a 400 kg satellite travelling at 700 m/s . Their paths are converging at a 45 degree angle . After the collision they remain locked together. What is the final speed of both satellites? What angle is this at

*December 12, 2014*

**Math**

The sum of the squares of three consecutive whole numbers is 77. Form a quadratic equation and hence solve it to determine the numbers. (Hint: let the three consecutive numbers be x, x+1 and x+2)

*December 7, 2014*

**Math**

Samantha wants to buy 6 roses 4 carnations and 8 tulips she estimates that she will spend about 14 dollars on these flowers do you agree math chapter 5

*December 1, 2014*

**Chemistry**

copper is a product of the reaction that occurs when dry ammonia is passed over a sample f heated copper(2) oxide.The equation for the reaction is given: 2NH3+3CuO=3Cu+3H2O+N2 Calculate the mass of copper produced if 0.12dm^3 of nitrogen is produced at room temperature and ...

*November 26, 2014*

**Pre algebra**

My problem says The cost of a cell phone for one month is a linear function of the numbers of minutes used. The total cost for 20, 35, and 40 additional numbers Re shown. Then it gives a table where it's 20/48$, 35/54$ and 40/56$ The first question is , Find the linear ...

*November 24, 2014*

**math**

The new athletic facility on the downtown campus measures 0.74 km by 0.4 km. how many square meters is the facility

*November 17, 2014*

**Science Help!**

yes the answer is D thanks for all the help.

*November 14, 2014*

**sixth grade math**

I agree

*November 4, 2014*

**pre-algebra**

Wel-min makes a square quilt that has an area of 100 square feet.It has 25 square blocks, each the same size. What is the legth of each side of a block? A-2 feet B-4 feet C-6 feet D-10 feet

*October 30, 2014*

**Social Studies**

Number 2 is B

*October 30, 2014*