Friday

February 12, 2016
Total # Posts: 711

**Physics**

I have a few physics questions that I don't understand. Two are thermal expansion problems and the other is an ideal gas law problem. 1. Two rods, one made of iron and the other of aluminum, have the same initial length at 64.00 deg. C? When the temperature drops to 4.00 ...
*February 8, 2016*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Determine the magnitude and direction of the force that charge B exerts on charge A. (b) What is the force that charge A exerts on ...
*January 29, 2016*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Find the electric field on the x axis at x = 6 cm. (b) At what point on the x axis is the electric field zero?
*January 29, 2016*

**Physics**

(a) Estimate the positive charge in you due to the protons in the molecules present in your body. (Assume that the human body is made entirely out of water.) (b) What is the net charge in your body?
*January 29, 2016*

**Physics**

Tarzan (80 kg) runs toward a vine at 4.8 m/s where Jane (60 kg) is hanging on. He jumps and grabs the vine. How high does the vine swing? If the vine is 25 m long, how much of an angle does that make?
*January 28, 2016*

**physics**

A 10 kg mass moving at 6 m/s strikes a stationary 2 kg mass in an elastic collision. Determine the velocity of each after the collision. 10(6)+2(0)=(10)Vf1+(2)Vf2 60=(10)Vf1+(2)Vf2
*January 28, 2016*

**Algebra**

A colony of bacteria has a population of ten initially, and doubles in size every three hours. What is the population of the colony after 24 hours of growth ?
*January 24, 2016*

**geometry**

two boards make up two sides of triangular sandbox 8ft and 5 ft what size board makes third side? I say 5 because this makes an isoles triangle
*December 16, 2015*

**Geometry 12**

F is the center point. I have the same question and I'm really confused.
*December 14, 2015*

**Math **

I am a common multiple of 8 and 2. I am greater than 50 and my digits are 3 apart. What am I?
*December 7, 2015*

**Writing**

Just look back in the story to answer this essay!
*November 20, 2015*

**Physics**

Damon, thanks but is that for A or B and what is the answer, please star it or underline it or something that it shows the final answer for it.
*November 20, 2015*

**Physics**

A set of density rods is designed to illustrate the concept of density. The idea is to create cylinders of equal diameters and masses, but varying lengths, to show which have the largest and smallest densities. (a) Derive a formula that will predict the ratio of the length of ...
*November 20, 2015*

**multiple choice economics**

D. A good that is perceived as a necessity will be purchased even if the price rises. People will buy anything if it is a necessity like bread, milk or gas for their car, no matter how much money it costs.
*November 19, 2015*

**Physics**

They also said Derive a formula that will predict the ratio of the length of one rod to the length of another rod. Assume the radius and mass of each cylinder is the same and express your answer in terms of the specific gravity of each rod. (Use the following as necessary: SG1...
*November 19, 2015*

**Physics**

Density of lead is 11.36g/cm3 and density of brass is 8.553g/cm3 but I was not given the lenghts of anything. The info above was the only thing given to me.
*November 19, 2015*

**Physics**

How do I do that to answer my question?
*November 19, 2015*

**Physics**

A set of density rods is designed to illustrate the concept of density. The idea is to create cylinders of equal diameters and masses, but varying lengths, to show which have the largest and smallest densities. How do I do it?
*November 19, 2015*

**Physics**

If you want to design a set of five density rods (made of aluminum, iron, copper, brass, and lead), determine the ratios of the lengths of each rod to the length of the lead rod, the densest material in the group. The specific gravities of the elements are approximately SG ...
*November 19, 2015*

**spanish**

I have the same question and I don't know the answer! can you help me?
*November 14, 2015*

**Math (Algebra)**

Two groups went to the movies. The first group included 3 adults and 5 kids and paid a total of $71. The second group included 5 adults and 3 kids and paid a total of $81. If ticket prices were the same for each group, find the cost of each type of ticket.
*November 5, 2015*

**Math**

Thank you.
*October 27, 2015*

**Math**

would the answer be: A=1*W 18x24 = 432
*October 27, 2015*

**Math**

How many 1 inch squares can be cut from an 18"x24" piece of contruction paper
*October 27, 2015*

**Physics**

A spring that has a spring constant of 150 N/m is oriented vertically with one end on the ground. (a) What distance does the spring compress when a 4-kg object is placed on its upper end? in m. (b) By how much does the potential energy of the spring increase during the ...
*October 23, 2015*

**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*

**grammer**

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*

**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*