Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 176

**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?

**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"?

**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?

**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...

**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)

**Math**

what is the ratio of 4 engines to 18 box cars....trying to help my son in math???

**math**

x=2 m=21 w=-12

**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 r...

**social studies**

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

**Math**

You simply factor out a 2x to get: 2x(3x+7)

**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...

**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...

**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.

**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.

**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.

**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, ...

**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?

**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 rat...

**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. Fin...

**calculus**

Use logarithmic differentiation: F(x)= (3x+6)^4 (x^3 -2)^5 f'(x)=

**Math**

I mean 12 letters not 14. Sorry

**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.

**Math**

The number in a power that is used as a factor is what?

**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 sphe...

**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.

**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.

**Chem help please**

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

**GTA**

GTA V came out no one wants to answer

**Math**

What inequality will equal -2 and 8?

**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?

**Math**

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

**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

**english**

what is the historical allusion?

**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

**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?

**Internal and external Tratis **

Internal and external Tratis of any charter u can think of? Please help me. Your help is needed...

**Internal and external Tratis **

Internal and external Tratis of any charter u can think of? Please help me. Your help is needed...

**math**

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

**Math**

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

**math**

6.4 - Y = 6 2/5 What is Y

**Magnasium**

Mg

**Math**

Find the third angle of aright angle if one of the angles measures 24 degrees

**Math**

Find the third angle of aright angle if one of the angles measures 24 degrees

**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...

**Science**

Are floods both constuctive and destructive?

**math**

Thank you very much :)

**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?

**math**

How to write 3.100 in word form

**algerbra**

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

**math**

how to write 12.37 as a mixed number

**Biology**

It does not involve incest.

**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.

**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.

**MATH**

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

**MATH**

A paper is 28cm long, how many meters is this?

**history**

Im having trouble understanding the question let alone answering it.

**history**

Im having trouble understanding the question and the answer to it.

**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?

**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 b...

**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. Dur...

**math**

thank you very much!

**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?

**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.

**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%?

**math/science**

48 sec

**math**

duh, so easy I should have known that, thank you very much

**math**

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

**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.

**geomtry**

EF is a median of trapezoid ABCD. The length of AB is 12, and the length of CD is 18. What is the length of EF?

**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).

**Physics**

1.) ((m*v^2)/r1)+ma

**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...

**Calculus**

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

**Calculus**

Anyone?

**Calculus**

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

**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?

**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 ord...

**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?

**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

**physic**

LOL CHRISTIAN YOU POSTEd THE QUESTION? NICEEEE i was anonymous above ^--- xD

**chemistry**

How many cm does it take to make 500ml

**chemistry**

How many cm does it take to make 500ml

**Math**

Test each number for divisibility 2,3,5,and 10? 48,960

**Chermistry**

5.20 moL

**math**

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

**math**

write two equations that prove the associative property is not true for the subtraction

**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?

**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

**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

**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?

**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?

**geometry**

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

**the outer planets**

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

**cheristin school**

9x8x7x6x5=

**math**

How do you build an array for 4x7?

**Trig**

Give the exact value of the trigonometric function: arctan(√3)

**Precalculus**

Got it! Thanks.

**Precalculus**

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

**world geography**

what is the formal an funticnal region in washington

**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 w...