Friday

May 6, 2016
Total # Posts: 2,459

**physics**

Two masses are connected by a string. Mass A is on a flat roof and mass B is hanging over the edge of the roof. The mass on the roof is 15 kg and the hanging mass is 5 kg. The edge of the roof is 100 m above the ground. The two masses are initially at rest with the hanging ...
*November 18, 2010*

**math cal**

A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest whole number.)
*November 17, 2010*

**physics**

if you were stationary in space at the same distance from the sun as the eath is, how much force would the sun be exerting on you? what would be your acceleration towrd the sun? what would be the sun's acceleration toward you? okay so im a little confused where to go with ...
*November 14, 2010*

**chemistry**

If I make an ice pack with 750 mL of water, what mass of ammonium chloride must I include to get the temperature to drop from 20 degrees celsius to 5 degrees celsius. The heat of solution of the water and ammonium chloride is 14.8 kJ/mole.
*November 14, 2010*

**Chemistry**

Calculate the velocities of electrons with de Broglie wavelengths of 1.7 102 nm and 5.0 nm, respectively.
*November 13, 2010*

**math**

6/3.6=5/x= x=3
*November 10, 2010*

**chemistry**

i think its fluorine but im not sure if its right but i do believe that it is not right
*November 9, 2010*

**chemistry**

Which halogen can form only one oxidation state other than zero?
*November 9, 2010*

**science/math**

One multicellular organism is a cube. Each of its sides is 3cm long. Each of its cells is 1cm to the third power.How many cells does it have? If each side doubles in length,how many cells will it then have?
*November 9, 2010*

**com156**

• Write two paragraphs explaining the changes that you would make to revise the paper. The minimum word count for these two paragraphs is 400 words.
*November 9, 2010*

**Physics**

a. you do v^2 = vi^2 = 2aD then u do V= vi + at to get time as 20.3 b. D= Vox*T (415.7)(20.3) = 8440m c.430m/s at 14.8* downward
*November 7, 2010*

**Physics**

a rifle is fried from the top of a building 220 meters high with an initial velocity of 425 m/s at an angle of 12.0 degrees above the horizontal. a. how long will it take for the bullet to reach the ground? b. how far from the base of the building will the bullet strike the ...
*November 7, 2010*

**cal**

never mind i think i got the answer..thanks any way:)
*November 7, 2010*

**cal**

((4)/(3)x)*(sqrt(3-x)) i'm not sure how to find the derivative I know that I have to use chain rule so would it be 4/3(sqrt(3-x)+((4/3)x)((1/(3-x)^-.5) If this is right can someone help me simplify it
*November 7, 2010*

**math**

solve for x 2(e^-7x)=5
*November 7, 2010*

**English**

What are some differences between Beowulf and Wanderer?
*November 7, 2010*

**English**

Is there any basic format for a graphic organizer?
*November 7, 2010*

**english**

I really don't understand how to scan a poem for iambic pentameter. Help!!
*November 7, 2010*

**english **

does this sentence make sense? They’re excited about the spring fling Hannah replies, as she her cheeks stain scarlet.
*November 6, 2010*

**english**

I need to contrast and compare Beowulf's speech (lines 365-428) with Gaiwain's speech (lines 343-361)
*November 6, 2010*

**12th grade**

I am assuming you are talking about committees... Committees examine each bill and combine like bills to create a final bill that is presented to the Legislature.
*November 5, 2010*

** Anonymous and bobpursley**

can you please Anonymous and bobpursley explain this to me. Please and thank you
*November 4, 2010*

**physics**

okay but can you explain to me how to find N1 and N2
*November 4, 2010*

**physics**

can u explain to me what you mean by y direction is equal to and for the force *distance *the angle i don't know the angle for the question
*November 4, 2010*

**physics**

you just have to add w w w to the website
*November 4, 2010*

**physics**

img145.imageshack.us/img145/7130/picture1n.png this is basically the diagram to my question A person of mass m = 62 kg is doing push-ups as shown in the attached figure. The distances are a = 91 cm and b = 60% of l1. Calculate the vertical component of the normal force exerted...
*November 4, 2010*

**math**

use the distributive property so 100*20 and 100*40 then multiply them :)
*November 4, 2010*

**Chemistry**

A certain brand of iron suppluement contains FeSo4 7H20 with miscellaneous binders and fillers suppose 22.93 mL of KMnO4 solution used in the question above are needed to oxidize Fe2+ to Fe3+ in a 0.4927g pill. What is the mass percent of FeSo4 7H20(molar mass 278.03 g/mol) in...
*November 2, 2010*

**CHEMISTRY**

Thanks
*November 1, 2010*

**precalc**

If a savings fund pays interest at a rate of 10% per year compounded semiannually, how much money invested now will amount to $5000 after 1 year? Please round the answer to the nearest cent.
*October 31, 2010*

**Physics**

Your car is stuck in the mud and two friends are helping you. One is pulling on your car with a force of 370 N at a 40 degree angle and the other is pulling with a force of 450 N at a 30 degree angle. A force of 725 N is required to remove the car. Is the car still stuck? ...
*October 29, 2010*

**1st grade**

how are elephant and dinosaur and whales are alike
*October 27, 2010*

**Science **

Cannabis tricks nerves in the brain into sending distorted messages. Which of the drugs effects on the body could this explain??? Helpp!
*October 22, 2010*

**Physics**

What is the equation for average velocity given x1 (initial distance), x2 (final distance), t1 (initial time) and t2 (final time)?
*October 21, 2010*

**pre calc trig check my work please**

sin x + cos x -------------- = ? sin x sin x cos x ----- + ----- = sin x sin x cos x/sin x = cot x this is what i got, the problem is we have a match the expression to the equation work sheet and this is not one of the answers. need to figure out what im doing wrong so i can ...
*October 20, 2010*

**3rd grade math**

use any method estimate 667-651
*October 20, 2010*

**3rd grade math**

use any methond to eastimate each difference
*October 20, 2010*

**Math**

Meg wants to install square tiles in a rectangular room. How can identifying common factors help her decide if any tiles will need to be cut? Use numbers to help you explain. And if the rooms aren't the size of the tiles then what do I do?
*October 16, 2010*

**Food**

main nutrient suppkied by meat and alternatives is carbohydrates?
*October 15, 2010*

**Food**

Main mineral supplied by dairy products?
*October 15, 2010*

**Geography/History**

The correct answers are 2,3 and 5. Affected Nations throughout the world. Reduced the number of communist nations in the world. Changed boundaries in Europe.
*October 15, 2010*

**Business**

How can lean manufacturing and near-sourcing help a company gain a competitive edge and prepare for the future?
*October 14, 2010*

**pleaese help math**

12p^2q|7mn^3|3p^3q^3|21n^4
*October 13, 2010*

**math**

-3v+3 _______ 6v+5 is to make sense, the values that v can take must be restricted. State the restriction on v
*October 13, 2010*

**math 208**

21n^4 ______ 5x^3y^4 _______ 7mn^2 _______ 20x^2y
*October 13, 2010*

**8th grade math**

its 2/3
*October 13, 2010*

**math 209**

machine produces 192 bolts in 20 minutes. At the same rate, how many bolts would be produced in 50 minutes? thank you
*October 13, 2010*

**math 209**

A certain medicine is given in an amount proportional to a patient's body weight. Suppose a patient weighing 108 pounds requires 135 milligrams of medicine. What is the weight of a patient who requires 260 milligrams of medicine?
*October 13, 2010*

**business**

Today's progressive managers:
*October 10, 2010*

**math**

2" diameter cardboard core
*October 8, 2010*

**math**

what is the formula to estimate the amount of fabric that is on a 2" cardboard core?
*October 8, 2010*

**Physics**

23.3
*October 8, 2010*

**Discreet Mathematical Structures**

Use proof by contraposition to prove the following statement: If A is the average of two positive real numbers then one of the two numbers is greater than or equal to A. Proof. Domain: positive real numbers P: A=(x+y)/2 Q: x is greater than or equal to A or y is greater than ...
*October 7, 2010*

**physics **

A baseball player hits a baseball (m = 0.145 kg) The ball is initially traveling horizontally with speed of 36 m/s. The batter hits a fly ball as shown, with a speed vf = 54 m/s. (a) What is the magnitude and direction of the impulse imparted to the ball? (b) If the ball (m = ...
*October 5, 2010*

**calculus**

can someone check these for me: 18. All edges of a cube are expanding at a rate of 6 cm per second. How fast is the volume changing when each edge is a) 2 cm and b) 10 cm. a)72 cm^3/sec b)1800 cm^3/sec 20. The formula for the volume of a cone is v=(1/3)(pi)(r^2)h. Find the ...
*October 5, 2010*

**Calculus**

The answer is f'(x)=2((x^2+3)^5+x)[5(x^2+3)^4(2x)+1] I don't understand where the +1 at the end comes from
*October 3, 2010*

**Calculus**

find the derivative of f(x)=((x^2+3)^5+x)^2 using the chain rule. I know that I would start with f'(x)=2((x^2+3)^5+x) but I don't know how to do the rest
*October 3, 2010*

**physics**

Using the equation provided we can just substitute our knowns and solve for a. (15m/s)^2=(0m/s)^2+2a(1m) a=112.5 m/s^2 F=ma F=(60kg)(112.5m/s^2) 6750 N
*October 2, 2010*

**math**

Estimate f′(−3) where f(x) = x^3 + 8x^2 − 10x − 1 to within one decimal place by using a small enough interval. f′(−3) ≈
*October 1, 2010*

**math**

(i) Compute the average rate of change over the shortest interval to the left of the point of interest (for instance, for the interval from 6 to 9). (ii) Compute the average rate of change over the shortest interval to the right of the point of interest (for instance, for the ...
*October 1, 2010*

**business**

free cash flow
*September 28, 2010*

**descriptive essay**

bobpursley- The essay has to describe a place. The thesis has to have a key term that refers to the place we are describing.
*September 27, 2010*

**descriptive essay**

Thesis statement: My bedroom, which I share with my boyfriend and my daughter, is unbearably crowded. The professor wants one paragraph describing something to contrast to our main idea. That paragraph is about my mom's house. The rest of the essay is describing my bedroom.
*September 27, 2010*

**descriptive essay**

This is my introduction paragraph for a descriptive essay. My professor told me that the thesis was a fact, not an idea. Is there a way that I can reword it to make it an idea? Though being a parent is one of the greatest joys of life, teen parenting comes with a few ...
*September 27, 2010*

**calc**

Thats what I got whenever I simplified it
*September 27, 2010*

**calc**

Find the derivatives of the following functions using the differentiation rules. f(x)=(x^3-2x^2+x+1)(sqrt(x)-3x+9) I did: f'(x)=[x^3-2x^2+x+1][(1/2x^(-1/2)-3]+[x^(1/2)-3x+9][3x^2-4x+1] which I got to be [-12x^3+(7/2)x^(5/2)+46x^2-5x^(3/2)-42x+(3/2)x^(1/2)+6]/[2x^(1/2)] I ...
*September 27, 2010*

**Algebra 2**

How do you factor u^2 - v^2 + 2v + 1?
*September 26, 2010*

**Geometry**

I have this much so far (1+x)/9 = 2/5 or x = 13/5 = 2.6 ft I am unsure of how to work out the rest of the problem. A wooden board is placed so that it leans against a loading dock to provide a ramp. The board is supported by a metal beam perpendicular to the ramp and placed on...
*September 26, 2010*

**Geometry**

PLEASE! Someone help me with geometry!? A wooden board is placed so that it leans against a loading dock to provide a ramp. The board is supported by a metal beam perpendicular to the ramp and placed on a 1 ft. tall support. The bottom of the support is 9 feet from the point ...
*September 22, 2010*

**english**

read the following sentences and underline each word or phrase that signals a comparison or contast clue. circle comparison or contrast, depending on the clue. then write the meaning os each italicized word. 1.) We thought we were seeing the real painting, but it turned out to...
*September 22, 2010*

**PHYSICS**

Taylor Swift leaves Philadelphia for a concert in Dallas. Kellie Pickler leaves at the same time, but in a different tour bus. After 2 hours, Taylor's bus has traveled 50% further than Kellie's bus. If Taylor's bus is going 30mph faster than kellies's bus, how ...
*September 21, 2010*

**PHYSICS**

Thank you
*September 21, 2010*

**PHYSICS**

The roadrunner leaves Pittsburgh at 7:15 in the morning at 10mph. He is headed toward Cleveland which is 131 miles away. If the coyote leaves 15 minutes later, what speed will he have to travel to get there at the same time as the road runner?
*September 21, 2010*

**Algebra**

you're welcome!
*September 21, 2010*

**Algebra**

I found this example on purplemath You coul use this and apply knowledge. This is the original equation. x2 + 6x – 7 = 0 Move the loose number over to the other side. x2 + 6x = 7 Take half of the x-term (that is, divide it by two) (and don't forget the sign!), and ...
*September 21, 2010*

**Physics**

The roadrunner leaves Pittsburgh at 7:15 in the morning at 10mph. He is headed toward Cleveland which is 131 miles away. If the coyote leaves 15 minutes later, what speed will he have to travel to get there at the same time as the road runner?
*September 21, 2010*

**Physics**

Two cars start from the same place at the same time. After two hours, one car has traveled 30% farther than the other. If one car's speed is 20mph larger than the other car's speed, what are teh speeds of the cars? Solve algebraically
*September 19, 2010*

**algegra**

Volume= length *width*height. Area is length*width. Therefore to find the volume you just need to multiply 56*6 which is 336
*September 19, 2010*

**biology**

energy that is lost at each trophic level of an ecosystem is replenished by????
*September 19, 2010*

**calculus**

how did you get all of those x's with exponents?
*September 19, 2010*

**calculus**

sorry i should have put lim tan(x)/x
*September 19, 2010*

**calculus**

I broke that down into the lim of sinx/(xcosx)
*September 19, 2010*

**calculus**

lim as x approaches 0 of tanx/x
*September 19, 2010*

**Calculus**

no its a 2.
*September 18, 2010*

**Calculus**

We don't start derivatives until the next chapter. I'm just don't understand how you can determine each side of a limit seperately without using a graph or chart.
*September 18, 2010*

**Calculus**

But now if it does not exist we have to go back and look at the limit as the function approaches from the left and from the right and describe the behavoir of the function for example if it approaches infinity or negative infinity. I don't know how to do that analytically ...
*September 18, 2010*

**Calculus**

Our professor wants us to evaluate the limits analytically without using a table or a graph, and if it doesn't exist we must describe the behavor near the limit point. I'm not sure how to evaluate each side of a limit seperately without looking at a table or graph. ...
*September 18, 2010*

**Algebra 2**

thanks
*September 18, 2010*

**Algebra 2**

Is the solution to 0 ≤ |4u - 7| u ≥ 7/4?
*September 18, 2010*

**Algebra 2**

-(y+3) = 2y - 5 -y-3 = 2y-5 -3y = -2 y = 2/3 Is this how to solve the equation?
*September 18, 2010*

**Algebra 2**

What two equations can you write from |y+3|+5=2y? I know one is y+3=2y-5, which becomes 8. Is there another equation possible?
*September 18, 2010*

**Algebra 2**

thanks
*September 18, 2010*

**Algebra 2**

|2(-3)| + 3 = -3 9=-3 ?
*September 18, 2010*

**Algebra 2**

Is it possible to solve |2x| + 3 =x? I got x= -3, but it doesn't seem to work when you plug it into the original equation to check it..
*September 18, 2010*

**french**

Isn't the feminine form without the s, like noire?
*September 18, 2010*

**Algebra II**

What's the solution for -5 < 1 - 2k < 3? Is it 3 > k >-1 or is it -1 < k < 3? I'm not sure if you have to switch the order of the numbers also when you're dividing it by a negative number..
*September 15, 2010*

**calculus**

Find the limit if it exists. The limit of (sqrt(x+1)-2)/(x-3) as x tends to 3. The limit of (sqrt(x+5)-sqrt(5))/x as x tends to 0
*September 12, 2010*

**Physics**

kg for the 4 x 10^-26
*September 10, 2010*

**Physics**

How many uranium atoms are there in 8.4 g of pure uranium? The mass of one uranium atom is 4 x 10^-26
*September 10, 2010*

**Math - factoring**

Solve by factoring: 1.) x^2 - x - 12 = 0
*September 9, 2010*