Sunday

February 14, 2016
Total # Posts: 1,701

**Physics**

A 600W flashlamp fitted to a camera is operated by discharging a 10 000 uF capacitor through the lamp. The capacitor is charged initially from a 6V battery. Calculate A) the energy stores in the capacitor when fully charged B) the duration of the flash
*February 11, 2016*

**chemistry**

an ezyme -catalysed reaction was carried out in a solution buffered with 0.05 M phosphate ph 7.2 . As a result of the reaction ,0.06M of acid was formed. (phosphoric acid has three pka values. The one required for this calculation is pka2=7.2). 1) what was the pH at the end of...
*January 12, 2016*

**Science**

So the oceans would gravitate to other locations, altering the geography of the planet and the tides would be weaker? or would the tides be stronger, or remain the same?
*December 18, 2015*

**Science**

This is an actual question on my homework...
*December 18, 2015*

**Science**

What would happen to ocean tides on Earth if Earth stopped rotating?
*December 18, 2015*

**Physics**

A golfer rides in a golf cart at an average speed of 3.93 m/s for 43.3 s. She then gets out of the cart and starts walking at an average speed of 1.13 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 1.99 m/s? Can ...
*December 17, 2015*

**Finite Math**

What is the coefficient of y^14 in the expansion of (x+y)^14? What is the coefficient of xy^13 in the expansion of (x+y)^14? What is the coefficient of x^2y^12 in the expansion of (x+y)^14?
*December 10, 2015*

**Finite Math**

Pete's Pizzeria offers 30 different pizza toppings. How many 3 topping pizzas are possible (assuming the toppings are distinct)? If we allow any number of toppings (all distinct), including none, how many different pizzas are possible?
*December 10, 2015*

**Finite Math**

At a local ice cream shop, you can choose from a collection of 11 different toppings. If you want to choose at least one topping, how many different topping combinations are possible (assuming no repeat toppings)?
*December 10, 2015*

**Finite Math**

At Sally's Salads, there is an all you can eat salad bar. You may choose one of 3 different lettuces, any number of 11 vegetable toppings, and at most one of 6 dressings. Suppose a salad is made at random following those rules. If the salad includes a lettuce choice, but ...
*December 10, 2015*

**Statistics need help**

Need help please on these questions: 1. A poll at Steve's high school was taken to see if students are in favor of spending class money to expand the junior-senior parking lot. Steve surveyed 6 random students from the population. 85% favored the expansion, while 15% ...
*November 25, 2015*

**Statistics**

One last one. A poll at Steve's high school was taken to see if students are in favor of spending class money to expand the junior-senior parking lot. Steve surveyed 6 random students from the population. 85% favored the expansion, while 15% opposed it. a) Determine the ...
*November 25, 2015*

**Statistics**

And need help on thos one: You have a bag of marbles containing 4 blue marbles, 5 red marbles, and 3 green marbles. What is the theoretical probability of pulling a red marble? Run an experiment to see how long it takes you to pull a red marble (you don't have to use ...
*November 25, 2015*

**Statiatics**

Need help please. Determine whether each experiment is a binomial experiment or can be reduced to a binomial experiment. If so, describe a trial, determine the random variable, and state n, p and q. a) You roll a die 15 times and find the sum of all the rolls. Just need this ...
*November 25, 2015*

**Math**

The mass of a box with 6 tennis balls is 2 kg 40 g. The same box with 10 tennis balls is 3 kg 160g. What is the mass of the empty box?
*November 18, 2015*

**Math**

Rope p is 3 times as long as rope q. Rope q is 1m 10 cm shorter than rope r. Rope r is 1 m 30 cm shorter than rope p. What is the length of rope q? Express your answer in meters and centimeters
*November 18, 2015*

**math**

Given that 2<=f(x)<=3 for -5<=x<=1, use a property of definite integrals to find an interval in which the value of interval sign{-5}^{1} f(x)dx lies.
*November 17, 2015*

**chemistry**

how many grams of NaCl should be added in 15ml which must have a final concentration of 10mM
*November 17, 2015*

**math**

Given that 2<=f(x)<=3 for -5<=x<=1, use a property of definite integrals to find an interval in which the value of interval sign{-5}^{1} f(x)dx lies.
*November 17, 2015*

**calc 2**

Consider the 4 leaf rose and a circle having polar equations: r=10cos(2Θ) and r=5 with 0≤Θ≤2π, respectively. Find the area of the region that lies inside the rose and outside the circle. hint: find the smallest positive value of Θ for which the ...
*November 15, 2015*

**calc 2**

A spherical tank of radius a feet is buried in the ground. The top of the tank lies b feet below the surface of the ground.(δ=64lbs/ft^3)Find a definite integral whose value equals total work done in emptying the tank through a pipe whose opening is at ground level. I ...
*November 15, 2015*

**Math**

A. X+4 B. X+4=12 When x=8
*November 14, 2015*

**Math**

A. X+4 B. X+4=12 When x=8
*November 14, 2015*

**Math**

Sarah has about containing x ribbons and 4 extra ribbons. Jill's has 12 ribbons. Express the number of ribbons that Sarah has in terms of x. For what value of x will Sarah and Jill have the same number of ribbons?
*November 14, 2015*

**Math**

Matt has y yards fabric. She used 2 yards to sew a skirt. She used the remaining fabric to make 5 jackets. Find the amount of material that was used to make each jacket in terms of y
*November 14, 2015*

**Math**

Debbie has a box containing y ribbons and 4 extra ribbons. Janine has 12 ribbons. Express the number of ribbons that Sarah has in terms of y. For what value of y will Debbie and Janine have the same number of ribbons
*November 14, 2015*

**Mcmath**

19 less than one-half of some number w, w" it's alsgebraically don't understand. Help please
*November 14, 2015*

**math**

Determine the standard matrix D of the linear mapping G: R^2-->R^2 that first rotates points clockwise through pi/6 radians and then reflects points through the line x2=x1
*November 11, 2015*

**math**

Determine the standard matrix D of the linear mapping G: R^2--R^2 that first rotates points clockwise through pi/6 radians and then reflects points through the line x2=x1
*November 11, 2015*

**Therochem**

What will the rate of reaction be when [IO3-] = 0.20 mol/L, {i-] = 0.40 mol/L, and [H+] = 0.10 mol\L ?
*November 4, 2015*

**trigonometry **

please help two boundary lines of a piece of property intersect at an angle 85 deg.. it is desired to cut off a triangular portion of the property which will be one acre (43560 sq. ft.) in area by means of a straight fence. If the fence begins at a point on one boundary 250 ft...
*November 4, 2015*

**Pre-algebra**

me too
*November 2, 2015*

**health**

Well, at least I got something that I didn't know right! I mean, I do D.T and Business Studies as GCSE's and the last thing that I did about health was in Year 9.
*November 2, 2015*

**health**

I know nothing about Health, but I know that Depression can be caused by a multitude of factors, such as the environment, mourning, and genetic issues, but there is no known cause, as it varies from person to person.
*November 2, 2015*

**English**

Ah... one problem, I don't have much time to do it in, as it is in tomorrow
*November 2, 2015*

**English**

I need to write a 4 stanza love poem for English homework, one problem, I'm rubbish at poems and haven't put pen to paper yet... HELP!!
*November 2, 2015*

**Science**

There is simply more mass for the heat energy to transfer to in a larger object than a smaller one.
*November 2, 2015*

**Reading**

I think that Ms. Sue is right
*November 2, 2015*

**physics**

rpm stands for rotations per minute, and 20 seconds is 1/3 of a minute, so divide 140 by 3 and you will have your answer!
*November 2, 2015*

**maths**

me neither
*November 2, 2015*

**english**

What, like Scooby-Doo in that movie with dinosaurs?
*November 2, 2015*

**Statistics**

Find the indicated probability: P(z<0.18 or z>2.13) I'm stumped and can't find material on how to do this anywhere. I can do something like P(0.18>z<2.13) but not this. PLEASE HAAALLLP!
*October 29, 2015*

**math**

the square root of 23 over 3 is equal to a) square root of 3 b)3 c)9 d)12 I found no one poof these answers to be true.
*October 27, 2015*

**Math**

A rectangular box is to have a square base and volume of 78 feet cubed. If the material for the base costs $.30 per square feet, the material for the sides costs $.10 per square foot, and the material for the top costs $.20 per square foot. Determine the dimensions of the box ...
*October 13, 2015*

**maths**

marc is looking at the plans for his new garage. the length of the garage is 8 metres. the scale of the drawing is 1:50 what will the length of the garage be on the drawing? which would be the most simplistic form for me to work this out, i really struggle ??
*October 10, 2015*

**maths**

Rosie is training for the next football match. She runs around a circular track with a radius of 60 metres. Use π = 3.14 and C = π d How far has Rosie run?
*October 10, 2015*

**maths**

Millie, Josh and Libby receive a bonus at work. They are paid in the ratio of 2:3:4 Josh's share is £105. What was the total amount of the bonus before they shared it?
*October 10, 2015*

**Physics**

You are standing on the roof of a building 300 m high, and throw a stone upward at 25 m/s. Find the speed of the stone as it strikes the ground.
*October 5, 2015*

**Algebra**

The path of a diver is given by y=-4/9 x^2 + 24/9x +12 where y is the height (in feet) and x is the horizontal distance from the end of the diving board (in feet). What is the maximum height of the diver?
*September 29, 2015*

**Physics**

Plzz help
*September 27, 2015*

**Physics**

In the figure below the left-hand cable has a tension T1 and makes an angle of 45 ◦ with the horizontal. The right-hand cable has a tension T3 and makes an angle of 48 ◦ with the horizontal. A W1 weight is on the left and a W2 weight is on the right. The cable ...
*September 27, 2015*

**math**

The tenths digit of ds decimal is the smallest prime n.The hundredths digits is twice the tenths digit is the GCF 18 and 27.
*September 22, 2015*

**Math**

simplify each expression 14 + 5(x + 3) - 7x 34 - 7x
*September 21, 2015*

**Physics**

.3 ft
*September 9, 2015*

**Physics**

A point charge of 4 μC is placed at the origin. There is an external uniform field E = 400 i N/C. What is the net force on a 5 μC charge placed at (5 m, 3 m) ??? i + ??? j N
*September 8, 2015*

**Chemistry **

To prepare 500.00 mL of 0.300 M buffer with a pH of 7.4. NaH2PO4/Na2HPO4 How many grams of each should be added to the 500.00mL flask to create this buffer?
*September 8, 2015*

**Chemistry**

During the operation of a bunsen burner, a chemical reaction occurs. This chemical reaction is represented by the chemical equation below: methane + oxygen - carbon dioxide +water. During this chemical reaction, methane and oxygen are converted into carbon dioxide and water. ...
*September 2, 2015*

**Chemistry-HELPPPP! PLEASE **

During the operation of a bunsen burner, a chemical reaction occurs. This chemical reaction is represented by the chemical equation below: methane + oxygen - carbon dioxide +water. During this chemical reaction, methane and oxygen are converted into carbon dioxide and water. I...
*September 2, 2015*

**Chemistry**

why is graphing a useful way for scientists to display data?
*September 2, 2015*

**Chemistry**

Calculate the density of an unknown sample of metal given that a 2.3504 gram sample of metal causes the water level in a graduated cylinder to rise from 33.5 ml to 35.2 ml. Show work
*August 31, 2015*

**Precalc HELP!!!**

Are These Right?? I'm kinda suck on #30!!
*August 31, 2015*

**Precalc**

How do you know what quadrant these two are in? I'm having a little trouble determining. Can someone check if my answers are correct for all and help me fix it to make it right. 10.) The point is on the x-axis and 12 units to the left of the y-axis. My answer: (0, -12) 12...
*August 31, 2015*

**French**

For #1 I meant- Hier était le lundi . Oh yes, thankyou for catching that. Yes I'd like that in French too & you helped with that already. As far as everything else, are my accents right and the sentences are correct??
*August 31, 2015*

**math**

i am a 6-digit number greater than 700,000.my hundred thousands digit is twice my ones digit,my thousands digit,and my hundreds digit.my remaining digits are the same-a prime number greater than 5
*August 26, 2015*

**Algebra 2**

Matt got caught lmao
*August 26, 2015*

**Health**

What is the primary function of the skeletal muscle?. A. Contraction B. Heating the body C. Protecting the body from harm D. Pumping blood to the rest of the body
*August 20, 2015*

**Math**

Peter is 8 years younger than Alex. In 9 years' time, the sum of their ages will be 76. How old is alex now?
*August 8, 2015*

**math**

yes
*July 28, 2015*

**math**

There are ? different ways to represent the square root of 1000000 in the form a square root b, where a and b are positive integers. One way is 1 square root 1000000 A. 2 B. 4 C. 12 D. 16 About this question, i have no idea what they are trying to ask....
*July 28, 2015*

**math**

A baseball pitcher can throw a base ball at 150 ft/s. Can this pitcher hit the 200-ft ceiling of its game dome, if he was capable of giving a baseball an upward velocity of 85 ft/s, from a height of 7 ft? (Assume the ball is traveling as a free-falling body, and g = 32 ft/s2...
*July 19, 2015*

**Geometry**

A regular pentagon has side length 12cm.the perimeter of the pentagon is 60cm and the area is 247.7cm2 .a second. Pentagon has side lengths equal to 24cm .find the perimeter of the second pentagon
*July 14, 2015*

**Physics**

An air puck of mass 0.382 kg is tied to a string and allowed to revolve in a circle of radius 0.64 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 0.67 kg is tied to it. The suspended mass ...
*June 19, 2015*

**Chemistry**

If a 0.688 mole sample of silver at 19.6°C absorbs 1.162 kJ of heat, what is the final temperature in C?
*June 10, 2015*

**Language Arts**

Did you already take the quiz?
*June 5, 2015*

** Math**

Jesse and Leah can install a new gutter system on a house in 4 hours when they work together. Working alone, it would take Leah twice as long to install a new gutter system as it would take Jesse working by himself. Leah caught a really bad cold and called in sick this morning...
*May 26, 2015*

**Math **

A spy plane, whose average speed in still air is 250 mph, departs with a 40 mph tailwind and returns to the same airport flying into the same wind. How far from the airport can the plane fly if it has enough fuel to fly for 5 hours?
*May 26, 2015*

**math**

What a horribly vague answer Steve. To someone who had a similar problem, you were of no help. can you at least say what the letters/variables represent?
*May 4, 2015*

**maths**

Solve for one of the variables in one of the equations, then plug that into the other two equations and solve for the other two variables. The easiest was to do this is honestly using linear algebra and turning that into a augmented matrix, but i dont know if you have taken ...
*May 3, 2015*

**Chemistry(difficult)**

Thank you DrBob, you saved a couple hours of my life.
*May 3, 2015*

**Chemistry(difficult)**

A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb per 1.185 g of 238U in the rock? The half-life of 238U is t1/2...
*May 3, 2015*

**Math**

A solid is made up of two rectangular prisms how would I find the surface area of the solid? The diagram shows 3 feet on top, 6 feet on the left side, 7 feet on the bottom, 2 feet and 4 feet to the right Our teacher gave us the answer of 156 then told us to figure out how she ...
*April 28, 2015*

**geometry **

What will happen to the circumference and the area of the maze a fun house maze that is circular in shape has a diameter of 50 feet. the owner decides to double the radius of the maze?
*April 27, 2015*

**Math**

Thank You Ms. Sue - you have been a great help as always. Josh
*April 27, 2015*

**Math**

I know how to find the surface area of a rectangular prism but, I am not sure when given the coordinates of 4 feet by 6 feet by 8 feet which is which? For example: height, width, length? I don't know which way it goes? Thank You very much for any help you can give me.
*April 27, 2015*

**Art**

It was D not A. I just finished this test.
*April 22, 2015*

**Microeconomics**

oops It's D 250
*April 19, 2015*

**Microeconomics**

The quantity of TVs sold is 100 at the unit price $200. Suppose the price elasticity of demand for TVs by the initial value method is 2.0, and you would like to decrease the unit price for TVs to $150. Then the new quantity sold must be __________ . A. 125 B. 150 C. 200 D. 250...
*April 19, 2015*

**Chemistry**

salt draws out the water
*April 17, 2015*

**chemistry**

no they didn't give anything else
*April 17, 2015*

**physics**

At what altitude should a satellite be placed into circular orbit
*April 15, 2015*

**math**

55 minutes after 9:55 so 10:50
*April 15, 2015*

**Science**

A 45 N force is applied to a 9.6 kg object, what is it's acceleration?
*April 10, 2015*

**Macroeconomics**

Can someone check my homework answers? Can not find these topics in my book; I read the chapter several times. Thank you 1.Income taxes create a difference between the wage rate paid by companies and received by workers. These taxes __________ both employment and potential GDP...
*April 5, 2015*

**Accounting**

Stuck on a few questions from my Accounting class. If anyone can help; I would be really grateful! 32. Of the following accounts, which might appear in the adjusted trial balance, but not in the post-closing trial balance? A. income summary B. owner's capital C. accounts ...
*March 28, 2015*

**Math**

C is correct answer He traveled 33.5 miles west.
*March 28, 2015*

**Debate**

I need help finding and article or news story to help my argument that Refusing to accept EBT cards is prejudicial. And that law makers should not banned EBT cards in fast food restaurants for the many card holders.
*March 21, 2015*

**Debate**

Thank you again Ms. Sue
*March 20, 2015*

**Debate**

I need help finding a good article for my essay. I need to address the issue that fast food restaurants now serve healthy alternatives, and that it can be good for ebt holders.
*March 20, 2015*

**english**

Thank you Ms.Sue
*March 19, 2015*

**english**

I need help on finding 3 positive points on: why EBT cards should not be banned at fast food restaurants.
*March 19, 2015*