Sunday

August 31, 2014

August 31, 2014

Total # Posts: 176

**life science**

Thy ar among the mst valueable sources of information about the earths history
*July 31, 2014*

**Physics **

How much work is done by the force F⃗ =(− 3.0 i^− 7.6 j^)N on a particle that moves through displacement Δr⃗ = 3.6 i^−2.0j^m?
*June 5, 2014*

**Physics **

A 50 g ball of clay traveling at speed v0 hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. A) What is the speed of the block after the collision? B) What percentage of the ball's initial energy is "lost"?
*June 2, 2014*

**Physics **

A) What is the kinetic energy of a 1200kg car traveling at a speed of 30 m/s (≈65mph)? B) From what height would the car have to be dropped to have this same amount of kinetic energy just before impact?
*June 2, 2014*

**Physics**

A 96.0-g wooden block is initially at rest on a rough horizontal surface when a 11.4-g bullet is fired horizontally into (but does not go through) it. After the impact, the block–bullet combination slides 6.5 m before coming to rest. If the coefficient of kinetic friction...
*March 4, 2014*

**Mathhh, HELP!**

Find the LCD: a) (12/55c^6) (4/11c^9) b) (9/4c+12) (5c/5c+10) c) (9x/x^2-4x+4) (5x/x^2-5x+6) d) (7/x) (3/42-7x) (x/x^2-36)
*October 29, 2013*

**Math**

what is the ratio of 4 engines to 18 box cars....trying to help my son in math???
*September 23, 2013*

**math**

x=2 m=21 w=-12
*May 30, 2013*

**Pre-Calculus**

A gardener has 72' of edging. She wants to use it to enclose a 125 square foot rectangular area; she does not have to use up all of the edging. What are the possible lengths that a side of the rectangle can have? Answer using interval notation. Hint: If the length of the ...
*May 30, 2013*

**social studies**

What is the total capacitance of capacitors connected in series, C1=444F, C2=621F
*March 25, 2013*

**Math**

You simply factor out a 2x to get: 2x(3x+7)
*February 28, 2013*

**Calculus**

When there is a negavtive exponent you need to flip the term to makee it positive so the problem should be written as: H(x)=(x^4-2x+7)[(1/x^3)+(2/x^4)] Then you simply multiply the two groups to get: H(x)=[(x^4-2x+7)/(x^3)]+[2(x^4-2x+7)/(x^4)] Then simplify the second fraction...
*February 28, 2013*

**Calc**

Possible derivation: d/dx(f(x)) = d/dx(log(x) csc(x)) The derivative of f(x) is f'(x): f'(x) = d/dx(log(x) csc(x)) Use the product rule, d/dx(u v) = v ( du)/( dx)+u ( dv)/( dx), where u =csc(x) and v = log(x): f'(x) = log(x) (d/dx(csc(x)))+csc(x) (d/dx(log(x))) The...
*February 28, 2013*

**Calculus**

I dont know if this is right because if you are using x for the distance the man is away from the light post then you cant set x equal to the rate at which the man is walking.
*February 28, 2013*

**Calculus**

A man is 6ft tall and is walking at night straight toward a lighted street lamp at a rate of 5 ft/sec. If the lamp is 20 ft above the ground, find the rate at which the length of his shadow is changing.
*February 28, 2013*

**Calculus**

Water is being poured into an inverted cone(vertex down) of radius 4 in and height 10 in at a rate of 3 in^3/sec. Find the rate at which the height of the water is increasing when the water is 5 in high.
*February 28, 2013*

**Calculus**

1a. 15 ft ladder is placed against a vertical wall. the bottom of the ladder is sliding away from the wall at a rate of 2 ft/sec. How fast is the top of the ladder sliding down the wall when the bottom of the ladder is 9 ft from the wall? 1b. Using the data in the first part, ...
*February 28, 2013*

**Calculus**

A 15 ft ladder is placed against a vertical wall. the bottom of the ladder is sliding away from the wall at a rate of 2 ft/sec. How fast is the top of the ladder sliding down the wall when the bottom of the ladder is 9 ft from the wall?
*February 28, 2013*

**Calculus**

If V volts are measured across a resistance of R ohms in a circuit carrying a current of I amperes, V=IR. At a certain instant, the voltage is 250 and is increasing at a rate of 4 volts/min, while the current is 0.5 AMP and is increasing at a rate of 0.01 amp/min. Find the ...
*February 28, 2013*

**Calculus**

Calculus If V volts are measured across a resistance of R ohms in a circuit carrying a current of I amperes, V=IR. At a certain instant, the voltage is 250 and is increasing at a rate of 4 volts/min, while the current is 0.5 AMP and is increasing at a rate of 0.01 amp/min. ...
*February 28, 2013*

**calculus**

Use logarithmic differentiation: F(x)= (3x+6)^4 (x^3 -2)^5 f'(x)=
*February 26, 2013*

**Math**

I mean 12 letters not 14. Sorry
*January 29, 2013*

**Math**

I'm doing a crossword and I need a word or words that equal 14. Does Factoredbase seem correct? That is the only thing I can come up with.
*January 29, 2013*

**Math**

The number in a power that is used as a factor is what?
*January 29, 2013*

**science**

a sphere of mass 500.0g is released from point A 5m above the ground and slides down to point B 3.2m through point C 2m in frictionless wire track. (1)determine the particle's speed at points B and C. (2)determine the net work done by the force of graviy in moving the ...
*January 16, 2013*

**Physics**

A 4.0 kg wheel of 20 cm radius of gyration is rotating at 360 rpm. The retarding frictional torque is .12 N.m. Compute the time it will take the wheel to coast to a rest.
*November 27, 2012*

**Physics**

A 4.0 kg wheel of 20 cm radius of gyration is rotating at 360 rpm. The retarding frictional torque is .12 N.m. Compute the time it will take the wheel to coast to a rest.
*November 27, 2012*

**Chem help please**

A solution is found to contain 1 x 10-4 OH− ions, determine the pH of this solution.
*November 16, 2012*

**GTA**

GTA V came out no one wants to answer
*October 30, 2012*

**Math**

What inequality will equal -2 and 8?
*October 23, 2012*

**statistics**

Consider the following types of data that were obtained from a random sample of 49 credit card accounts. Identify all the averages that can be used to summarize the data.(Select all that apply) 1.Outstanding balance on each account: mode,median,mean?
*September 15, 2012*

**Math**

For what value of k does the equation x2 + k = kx – 8 have: Two distinct real roots One real root No real root
*September 1, 2012*

**math**

A water skiing instructor recommends that a boat pulling a beginning skier have a speed less than 18 miles per hour. Write and solve an inequality that you can use to find the possible distances d (in miles) that a beginner can travel in 45 minutes of practice time
*August 13, 2012*

**english**

what is the historical allusion?
*June 6, 2012*

**Math**

Write the term of the binomial series. Simplify. a. The term with b^5 in (a-b)^9 b. The seventh term of (x^1/2 + x^-1/2)^8
*May 4, 2012*

**Geometry**

if a person 5 feet tall casts a 3 foot shadow and a building casts a 12 foot shadow, what is the height of building in feet?
*April 24, 2012*

**Internal and external Tratis **

Internal and external Tratis of any charter u can think of? Please help me. Your help is needed...
*March 19, 2012*

**Internal and external Tratis **

Internal and external Tratis of any charter u can think of? Please help me. Your help is needed...
*March 19, 2012*

**math**

for the following population of n=9 scores below. 11 12 16 15 19 16 13 17 11 range........ variance standard deviation s:
*March 10, 2012*

**Math**

if h(t) = 17.4 * 1.23^t, find t when z(t) = 144
*February 19, 2012*

**math**

6.4 - Y = 6 2/5 What is Y
*February 6, 2012*

**Math**

Find the third angle of aright angle if one of the angles measures 24 degrees
*January 18, 2012*

**Math**

Find the third angle of aright angle if one of the angles measures 24 degrees
*January 18, 2012*

**MATH (PLease HELp)**

Nickels = x Quarters = 3x Dimes = 3x-1 Plug in equation with coin values in ()... (5)x + (25)3x + (10)3x-1 = 430 5x + 75x + 30x - 10 = 430 80x + 30x - 10 = 430 110x -10 = 430 110x -10 +10 = 430 + 10 110x = 440 x = 4 Nickels = 4 (x) Quarters = 12 (3x) Dimes = 11 (3x-1) 4x5=20 N...
*October 18, 2011*

**Science**

Are floods both constuctive and destructive?
*October 13, 2011*

**math**

Thank you very much :)
*September 19, 2011*

**math**

comparing 1,272 and 1,269. Do you need to cmpare the ones digits? Which number would be the farther to the right on the number line and why?
*September 19, 2011*

**math**

How to write 3.100 in word form
*September 6, 2011*

**algerbra**

point b is the midpoint of ac. what is the value of a? c(-3a,6/7a)
*September 1, 2011*

**math**

how to write 12.37 as a mixed number
*August 25, 2011*

**Biology**

It does not involve incest.
*June 22, 2011*

**Math**

The woodpecker found 3069 bugs in a tree and ate two thirds of them.How many bugs were left in the tree?Draw a picture to illustrate the problem.
*May 23, 2011*

**maths**

The method for completing the square can be used to write the expression -2x^2+12x-5 in the form a(x+b)^2 +c, where a,b, and c are constants. What is the value of c? Thank you for any help.
*May 20, 2011*

**MATH**

Thank you, thats what my dad said but I didn't believe him :)
*April 26, 2011*

**MATH**

A paper is 28cm long, how many meters is this?
*April 26, 2011*

**history**

Im having trouble understanding the question let alone answering it.
*April 18, 2011*

**history**

Im having trouble understanding the question and the answer to it.
*April 18, 2011*

**history**

To what extent and in what ways did the great depression and the new deal alter americans perception of the legitimate role of government in the economic and social life of the united states?
*April 18, 2011*

**Physics**

A block of mass m is placed in a smooth-bored spring gun at the bottom of the incline so that it compresses the spring by an amount x_c. The spring has spring constant k. The incline makes an angle theta with the horizontal and the coefficient of kinetic friction between the ...
*March 13, 2011*

**Physics**

In a "worst-case" design scenario, a 2000-{\rm kg} elevator with broken cables is falling at 4.00 {\rm m/s} when it first contacts a cushioning spring at the bottom of the shaft. The spring is supposed to stop the elevator, compressing 2.00 {\rm m} as it does so. ...
*March 13, 2011*

**math**

thank you very much!
*February 27, 2011*

**math**

half of a gallon is a half gallon. half of a half gallon is a quart. half of a quart is a pint. half of a pint is a cup. a cup is what fraction of a quart? Is the answer 1/4?
*February 27, 2011*

**3rd grade math - arrays**

Mary says that the greater number of counters, the greater the number of different arrays you can form. Give an example that shows that Mary is wrong.
*February 9, 2011*

**math**

one fourth of the students earned A's. There were 280 students. How many earned A's? I got 70 for the answer but what is the percentage for that? Would it be 70%?
*February 7, 2011*

**math/science**

48 sec
*January 27, 2011*

**math**

duh, so easy I should have known that, thank you very much
*January 24, 2011*

**math**

a boy travels 20 km north, then 15 km south, how far is he from where he started?
*January 24, 2011*

**Organic Chemistry**

Write the mechanism for the reactions of: • (Z)-3,6-diethyl-oct-4-ene and bromine • (E)-3,6-diethyl-oct-4-ene and bromine Assign the R/S configuration for each of the products and determine the stereochemical relationship of each set of products.
*January 22, 2011*

**Calculus**

Use implicit differentiation to find the slope of the tangent line to the curve –2x^2–2xy–1y^3=–3 at the point (–1–1).
*November 5, 2010*

**Physics**

1.) ((m*v^2)/r1)+ma
*November 4, 2010*

**Physics**

Ironman steps from the top of a tall building. He falls freely from rest to the ground a distance of h. He falls a distance of h/ 3 in the last interval of time of 1.1 s of his fall. Hint: First, compute the velocity when Ironman reaches the height equal to the distance fallen...
*October 22, 2010*

**Calculus**

If f(x) = 2 √x, use the definition of derivative to find f′( x )
*October 21, 2010*

**Calculus**

Anyone?
*October 18, 2010*

**Calculus**

(1 pt) If f(x) = 2 √x, use the definition of derivative to find f′( x ).
*October 18, 2010*

**Calculus**

If 12x − 52 ≤ f(x) ≤ x2 + 4x − 36 determine lim x→ 4 f(x) = What theorem did you use to arrive at your answer?
*October 15, 2010*

**Finance Question**

Nathans Hot Dog Corp has projected the following sales for the coming year: Q1 Q2 Q3 Q4 Sales $ 700 $ 850 $ 950 $ 1,050 Sales in the year following this one are projected to be 17 percent greater in each quarter. Calculate payments to suppliers assuming that Nathans places ...
*October 11, 2010*

**5th grade**

melissa collected three kinds of autumn leaves ,oak,elm and maple.she has 2 times as many maple as elm leaves and 5 times as many oak as elm leaves .she has 32 leaves all together. how many of each kind does she have?
*September 30, 2010*

**Math**

I need to find the equation for the following (compound interest): number of years: 12 initial principal: 10000 annual interest rate: 0.03 additional investment each subsequent quarter: 500 The value in 12 years is 43074.4088874
*September 30, 2010*

**physic**

LOL CHRISTIAN YOU POSTEd THE QUESTION? NICEEEE i was anonymous above ^--- xD
*September 15, 2010*

**chemistry**

How many cm does it take to make 500ml
*September 12, 2010*

**chemistry**

How many cm does it take to make 500ml
*September 12, 2010*

**Math**

Test each number for divisibility 2,3,5,and 10? 48,960
*September 9, 2010*

**Chermistry**

5.20 moL
*August 31, 2010*

**math**

explain how you can find the sum 25+59 without using pencil and paper or a calculator. then find the sum
*August 23, 2010*

**math**

write two equations that prove the associative property is not true for the subtraction
*August 23, 2010*

**math**

the trainers took a count of the animals at the zoo. there are both birds and four legged mammals at the zoo. the trainers counted 550 feet and 155 animals on their first trip through. How many birds and mammals are there?
*August 9, 2010*

**algebra**

Put the equation in the form ax2 + bx + c = 0. Enter exponents using the caret ( ^ ). For example, you would enter 4x2 as 4x^2. 4x^2+5x=(3x-1)^2-3x^2
*June 17, 2010*

**Science**

Winds in the Northern Hemisphere curve to the right and winds in the Southern Hemisphere curve to the left. This is known as the a. Jet Stream b. Wind c. Weather Pattern d. Coriolis Effect
*May 25, 2010*

**pre algebra**

the kiel family has an annual income of $46,ooo. If they buget 6% for missions, how much will they give to missionaries each year?
*May 19, 2010*

**Algebra**

Hi, I have had to factorise the equation x^2 + x - 30 = 0, which I think I have worked the answer out as x =-6, x =5? I now need to explain how I can use this answer to solve the equation 4x^2 +4x -120 =0 Any advice?
*May 12, 2010*

**geometry**

if a regular octagon has a perimeter of 264 centimeters, what is the measure of each interior angle and each side?
*February 24, 2010*

**the outer planets**

I am working on a crossword that asks what is 4 times the diameter of Earth. Can you help with this?
*February 18, 2010*

**cheristin school**

9x8x7x6x5=
*January 27, 2010*

**math**

How do you build an array for 4x7?
*January 25, 2010*

**Trig**

Give the exact value of the trigonometric function: arctan(√3)
*January 21, 2010*

**Precalculus**

Got it! Thanks.
*January 3, 2010*

**Precalculus**

Solve the inequality and sketch the solution: -3≤ 2(x+4)< 14
*January 3, 2010*

**world geography**

what is the formal an funticnal region in washington
*November 16, 2009*

**pre algebra **

Okay Times the demominators 5 and 3 = 15 What do i time 3 by to get 15 = 5 so -2/3 becomes -10/15 What do I times 5 by to get 15 =3 so -4/5 becomes -12/15 Now I have -10/15 + -12/15 = -22/15 Can't be simplified so the answer is -22/15 or -1 and 7/15 I have a homeworkhelp ...
*November 9, 2009*