Saturday

April 25, 2015

April 25, 2015

Total # Posts: 1,154

**maths and physics**

A cannon is placed on a hillside pointing up the hill, where the hill is at an angle a Pi/4 to the horizontal. The cannon points at an angle Pi/6 to the slope. and a shot is red uphill with initial speed v0. (i) Find the maximum value of the distance between the ...
*March 3, 2013*

**physics**

A truck of mass 13,100 kg is acted upon by a driving force of 8900 N. The motion is opposed by a frictional force of 2230 N. Find the acceleration.
*March 3, 2013*

**physics**

20 m/s 2 J
*February 25, 2013*

**calculus 2**

thanks steve!
*February 23, 2013*

**calculus 2**

integrate e^(2x) / (e^(4x) + 9) am I allowed to simplify the e^(2x) with the e^(4x)? Thank you
*February 23, 2013*

**I need help**

this is the Answer jiskha try it
*February 23, 2013*

**I need help**

1:compare and contrast 2:Taxies represent the modern world 3:things that we might not value until it’s too late 4:Nicole and Camille left work, went to the gym, and ate dinner before 7 p.m. 5:intercontinental
*February 23, 2013*

**trig sub question**

thank you Steve
*February 22, 2013*

**trig sub question**

Hello, I have a question concerning trigonometric substitution. let's say we have integral of dx/sqrt(9x^2 + 4), so after doing a few steps we have: 2/3 integral of sec0/sqrt((2tan0)^2 + 4*) d0 (the * is for later on) the next step turns into: 2/3 integral of sec0/(sqrt(...
*February 22, 2013*

**Math**

it was not negative that was a subtraction sign
*February 20, 2013*

**Math**

so lets say i had 4w-8-1w i take 4w+1w= 5w then i have -8 left and i do 5w-8
*February 20, 2013*

**Math**

help me combine like terms. like how do you do it with different signs in the problem. 17 + 4w - 12 - w
*February 20, 2013*

**marketing**

what is market segmentation
*February 19, 2013*

**math**

If the digits of a number may be any one of 0 through 9 (except the first digit cannot be zero), and the system of alternating signs of coefficients is used to create a polynomial, what is the least number m of real zeros the polynomial can have? What is the greatest number M ...
*February 11, 2013*

**math**

A box with an open top is to be constructed from a rectangular piece of cardboard with dimensions W inches by L inches by cutting out equal squares of side x at each corner and then folding up the sides. (W = 12 in. and L = 20 in). Find the values of x for which the volume is ...
*February 9, 2013*

**math**

I am a 2-digit number with a 1-digit decimal. I am bigger than 54 but smaller than 56. 2 of my digits are even. When you divide my whole number by the digit in my decimal place, the answer has no remainder. What are the biggest and smallest numbers I could be?
*February 5, 2013*

**Calculus 2**

thanks!
*February 2, 2013*

**Calculus 2**

I have this integral that I don't know how to solve: ∫ (x-3)/sqrt(x) Would I multiply both parentheses first? or just turn it into (x-3)(x^-0.5)?
*February 2, 2013*

**calculus**

okay so there must be a mistake with the system, thanks for clearing that up Damon.
*February 2, 2013*

**calculus**

Using an upper-case "C" for any arbitrary constants, find the general indefinite integral ∫ (-2-t)(-9-t^2) dt Now I multiplied both parentheses to get: ∫ (18 + 2t^2 + 9t + t^3) dt now I integrated and got: 18t + 2t^3/3 + 9t^2/2 + t^4/4 + C but I'm ...
*February 2, 2013*

**Math**

2x-5=39 2x=39-5 2x=34 x=17
*January 29, 2013*

**math**

come on i waitied almost for 20 minutes and this is what i get. -_- not cool
*January 29, 2013*

**math**

A park ranger finds that 35% of the park visitors stay at the campground. Of 105 visitors stayed at the campground in one day, how many visitors did the park have that day? i got 36.75 people and then i rounded and got 37 people.
*January 29, 2013*

**calculus**

Thank Steve. But how do you get 60 or 70? or the -1?
*January 28, 2013*

**calculus**

it's integral, not interal, sorry for the mistake
*January 28, 2013*

**calculus**

find the derivative of: g(x) = interal(a=7x, b=6x) (u+5)/(u-5) du Hint: interal(a=7x, b=6x) (u+5)/(u-5) du = interal(a=0, b=6x) (u+5)/(u-5) du + interal(a=7x, b=0) (u+5)/(u-5) du
*January 28, 2013*

**math**

EXPLAIN HOW YOU CAN BREAK 6X7 ARRAY IN TO SMALLER ARRAYS .WHAT ARE THE NEW FACTS?
*January 28, 2013*

**Physics**

pickett!!!
*January 27, 2013*

**math**

If a farm as 13 heads and 36 feet. How many chicken are there and how many rabbit are there?
*January 25, 2013*

**math**

If a farm as 13 heads and 36 feet. How many chicken are there and how many rabbit are there?
*January 25, 2013*

**physics**

nevermind, got it, had to switch calculator from degrees to radian, hehe
*January 23, 2013*

**physics**

The displacement of a particle in centimeters is given by y=8 sin (2πft). If f=20 Hz, find the displacement and the velocity of the particle at a time t=0.01 s and 0.07 s. (ans: y=7.61 cm, v=3.11 m/s, y=4.70 cm, v= -8.13 m/s) After I plug in f to get w and switch to this ...
*January 23, 2013*

**ANSWER MY QUESTION **

IS AN ATOM AN ELEMENT
*January 22, 2013*

**chemistry **

is a element an atom?
*January 22, 2013*

**math help**

340-127=213pages in the morning before the afternoon 253-213=40pages read in the afternoon
*January 22, 2013*

**Pol 201 American National Goverment**

some of these answers are wrong, do not trust them.
*January 20, 2013*

**Physics**

Suppose you have a very long straw that can reach from a cup of water on the ground level to the top of a very tall building. When you use a pump to suck on the straw in order to bring water up, a. you can bring the water up to any height with no problem. b. you can bring the ...
*January 18, 2013*

**Pre-Algebra**

3.25 for one batch of cookie 16.5/3.25= ___ batches of cookies
*January 17, 2013*

**math**

x=5 6x5=30+4=34
*January 17, 2013*

**science**

nvm i see it
*January 17, 2013*

**science**

Au-gold ag-sliver sn-tin hg-mercury pb-lead k-potassium w-tungsten fe-iron that's not what i meant. what does each abrevation mean in latin? the orgin name?
*January 17, 2013*

**science **

What are the orgin names for these abbreviation? in latin Au-gold ag-sliver sn-tin hg-mercury pb-lead k-potassium w-tungsten fe-tron
*January 17, 2013*

**Physics**

I should indeed have formulated this a lot clearer. I have done an experiment in which I add a stationary point to the standard pendulum situation, which creates a period function dependent on both the length of the pendulum as on the height of the stationary point which ...
*January 7, 2013*

**Physics**

Hello everyone, I have made measurements of the periods of a pendulum attached to a stationary point at a certain height h. When plotting the periods as a function of the square root of the length minus the height it gives us a straight line. I now need to prove that this line...
*January 7, 2013*

**Chemistry**

How many joules ar required to heat a frozen can of juice (360 grams) from -5 degrees C (the temp of an overcooled refrigerator) to 110 degrees C (the highest practical temp within a microwave oven)?
*January 5, 2013*

**math**

A video rental store has 1,234 videos on the shelves. OF the videos 1/3 were rated PG and 1/2 were rated PG-13. What equation can be used to find v, the total number of PG and PG 13 videos in the store?
*December 29, 2012*

**math**

if A [] B = A^B-(A+B), 7 [] 9 = ?
*December 25, 2012*

**maths**

Express sin 2x cos 4x as a sum of trigonometric functions
*December 24, 2012*

**maths stats**

For each day of the 5-day working week Tom can choose any one of 6 newspapers to read at the lunchtime. (i) How many different choices are possible in a week? (ii) If Tom wants to read a different title each day, then how many different choices are possible in a week?
*December 23, 2012*

**Physics**

Amy age 8 27kg 127cm Bruce age 12 41kg 149cm Both Amy and Bruce are learning gymnastics and having trouble being able to get enough height and time in the air to do a back somersault without the coach spotting them. The coach gives them homework to just focus on jumping ...
*December 15, 2012*

**math problem**

To make an orange dye, 4 parts of red dye are mixed with 3 parts of yellow dye. To make a green dye, 2 parts of blue dye are mixed with 1 part of yellow dye. If equal amounts of green dye and orange dye are mixed,___________ of this mixture is composed of yellow dye.
*December 13, 2012*

**math**

According to the statistics of a famous high school in Canada, all their graduates went to either A or B for university study. Following are the proportions of graduates who went to the two universities. University Proportion A 1-k B k Suppose k = 0.4 (a) What is the standard ...
*December 9, 2012*

**Alegbra 1**

Mr. Jones got his car washed at super clean. The wash started at 1:55pm and ended at 2:05pm. It cost $7. Mr. Smith got his car washed at Super Clean for $12. the wash started at 9:30am and ended at 9:50 am. Write an equation for the line that represents this situation. Part 2...
*December 5, 2012*

**programming**

There are several types of room in a hotel. The HotelRoom Class of Previous Programming Problem was not specific regarding the type of room. Assume that a hotel has guest rooms and meeting rooms. Modify the HotelRoom class as follows: remove the capacity and status instance ...
*November 30, 2012*

**Physics**

A 2.50 kg wheel has a diameter of 20.0 cm and is rotating at 3600 rpm. A force acts on it causing it to come to a rest in 10.0 seconds. What is the magnitude of the force?
*November 26, 2012*

**Chemistry**

No problem :)
*November 24, 2012*

**Chemistry**

For the online course, 1)b and 2)c
*November 24, 2012*

**eng**

is the sentence: "By using a statement that began with 'I,' Ramon was able to state his feelings clearly." a simple sentence or a complex sentence?
*November 20, 2012*

**Physics HELP!**

The position of an object connected to a spring varies with time according to the expression x = (7.1 cm) sin (2.1π t). Find (a) the period of this motion (b) the frequency of the motion (c) the amplitude of the motion (d) the first time after t=0 that the object reaches ...
*November 19, 2012*

**math**

a mystery number is bigger than 50 and larger than 100. you can make exactly five different rectangles with the mystery number of tiles. its prime factorization consists of only one prime number. what is the number
*November 14, 2012*

**math**

a mystery number is bigger than 50 and larger than 100. you can make exactly five different rectangles with the mystery number of tiles. its prime factorization consists of only one prime number. what is the number
*November 14, 2012*

**Physics**

The boom of a crane is 20 m long and is inclined 20ᵒ from the horizontal. A bucket of cement with a mass of 3000 kg is suspended from the upper end of the boom. What is the torque acting on the point where the boom is attached to the crane? A. 5.5 x 105 Nm. B. 3.5 x 105 ...
*November 13, 2012*

**psychometric test**

Hi i have been given an experiment paper on personality, in this we have to come up with an updated version of Eysencks (EPI) questionnaire. This is to measure extroversion only ,we are measuring concurrent validity. Im having difficult in answering the co varibles which is my...
*November 13, 2012*

**Algebra**

help me solve this equation by substitution. y^2− 4x^2 = 7 9y^2+16x^2 = 323
*November 9, 2012*

**chemistry**

ryeng i suppose? this is a very easy question 392.4*10-10= x cm xcm^3= ycm^3 ycm^3* 21.09= mass in grams since face centered unit cell has 4 atoms mass/4, then use the product of that to divide by 1.66*10^-24 = amu your result should be 191.84 amu
*November 8, 2012*

**Chemistry**

How do I change 3,3,4,4,5,5-hexamethyl-1-hexyne into it's molecular formula
*November 8, 2012*

**physics**

the coefficients of static and kinetic friction for stone on wood are, respectively, 0.5 and 0.4. if a 150 kg stone statue is pushed with just enough force to start moving across a wooden floor and the same force continues to act afterward. find the statue’s acceleration.
*November 7, 2012*

**Calc 2**

Use Taylor’s Estimate to bound the error of the n-th order Maclaurin approximation of sin(a), where a 2 [��; ].
*November 3, 2012*

**home economics**

a firm produces 20 units of output at a market price of #5, a marginal cost of $5, and an average cost of $3. what is the firms economic profit and is the firm maiximizing its economic profit. Is the formula market price-average cost x quantity 20?
*November 2, 2012*

**physics**

For a glass lens submerged in water (n=1.33), the critical angle of incidence at which total internal reflection begins to happen is 60.1 degrees. What is the index of refraction of the glass?
*November 2, 2012*

**physics**

A 67.5 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.090 m/s. How much work must be done to stop it?
*October 30, 2012*

**physics**

What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
*October 30, 2012*

**physics**

What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
*October 29, 2012*

**physics**

What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
*October 29, 2012*

**Physics- Elena please help!!!!**

A centrifuge in a medical laboratory rotates at an angular speed of 3500 rev/ min. When switched off, it rotates through 41.0 revolutions before coming to rest. (a) Find the angular speed in rad/s. (b) Find the displacement in radians. (c) Find the constant angular ...
*October 29, 2012*

**physics**

What force must be applied to push a carton weighing 350 N up a 19° incline, if the coefficient of kinetic friction is 0.45? Assume the force is applied parallel to the incline and the velocity is constant. (Enter the magnitude of the force.)
*October 29, 2012*

**Math**

If 7x + 5 = -2, find the value of 8x.
*October 25, 2012*

**Math**

If 7x + 5 = -2, find the value of 8x.
*October 25, 2012*

**eco365**

You should be ashamed of yourselve
*October 24, 2012*

**Algebra 1**

Say x is the number of boxes sold in week 1, then: Boxes in week 1: x Boxes in week 2: x + 5 Boxes in week 3: 2x + 10 Total boxes = 4x + 15 4x + 15 = 431 x = 104 So in week 1 there was sold x = 104 in week 2: x + 5 = 109 in week 3: 2x + 10 = 218
*October 24, 2012*

**Algebra 1**

integer 1 = a integer 2 = b b-a = 1 (b is one more than a) b-7 = 2*a (b is seven more than two times a) a = b-1 b-7 = 2*(b-1) b-7 = 2b-2 b = -5 so a should be -6 answer is C)
*October 24, 2012*

**Physical Science**

630J
*October 22, 2012*

**Chemistry**

Dear sir, madam, I am having a little problem with the solution my chemistry book gives on the following problem: We have a person whose body vitamine C concentration decays according to the following formula: 1500*0,974^t. Question A is no problem, but then question B: "...
*October 17, 2012*

**Math**

angle ABC ~= angle ACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mangle CBD = 1/2 mangle BAC
*October 14, 2012*

**Math**

ÚABC ~= ÚACB BD perpendicular AC The sum fo the three angles in any triangle is 180 degree. Prove: mÚCBD = 1/2 mÚBAC
*October 14, 2012*

**PHY 101 **

A 0.425-kg blue bead slides on a frictionless, curved wire, starting from rest at point where h = 1.50 m. At point , the blue bead collides elastically with a 0.675-kg green bead at rest. Find the maximum height the green bead rises as it moves up the wire. PLEASE HELP I HAVE...
*October 6, 2012*

**science**

What happens when you burn magnesium metal using the big idea of energy?
*October 6, 2012*

**math**

If μ = 500 and σ =10, z = -3.0 falls how many points below the mean?
*October 2, 2012*

**baking**

I dont have any choices that why i cant find it.
*September 25, 2012*

**baking**

when making french doughnuts the paste is piped into rings onto _____ _____ and is then lowered into the fat.
*September 25, 2012*

**Physics**

Vector , which is directed along an x axis, is to be added to vector , which has a magnitude of 5.0 m. The sum is a third vector that is directed along the y axis, with a magnitude that is 5.5 times that of . What is the magnitude of ?
*September 17, 2012*

** AP Physics**

A monkey is hanging from a branch located exactly 24 meters along the ground from the hunter. The monkey is 14 meters above the ground. The hunter aims directly at the monkey and fires a water balloon at the monkey just as the monkey releases his grip. The balloon has an ...
*September 15, 2012*

**physics**

A child operating a radio-controlled model car on a dock accidentally steers it off the edge. The car's displacement 0.58 s after leaving the dock has a magnitude of 7.1 m. What is the car's speed at the instant it drives off the edge of the dock?
*September 15, 2012*

**physics**

Stones are thrown horizontally with the same velocity from the tops of two different buildings. One stone lands twice as far from the base of the building from which it was thrown as does the other stone. Find the ratio of the height of the taller building to the height of the...
*September 15, 2012*

**Math**

1/2x+1/2=y
*September 13, 2012*

**physics**

A golf ball is dropped from rest from a height of 8.20 m. It hits the pavement, then bounces back up, rising just 5.40 m before falling back down again. A boy then catches the ball when it is 1.40 m above the pavement. Ignoring air resistance, calculate the total amount of ...
*September 8, 2012*

**Math**

Find the pattern and fill in the blank. 94 26 ___ 14 10
*August 27, 2012*

**Spanish**

Will you please check my grammar? Thanks! In a one-page, typed essay, describe what you would do if you were the governor of your state (or mayor of your city). Include what you would do regarding three separate issues of importance in your state (or town). Si yo fuera el ...
*August 19, 2012*

**Math/physics**

Known factors-weight 105 g---speed at start 60 mph---distance traveled 70 yds. Questions ,what is the rate of decelleration?, At what yard marker does it decellate to 35 mph For each 5 feet higher from start - how much farther does it travel. Thank you for your help, Tom
*July 28, 2012*

**physics**

the problem stated that the rod has expanded 1/4 its volume. I am looking for the heat supplied that has made its volume expand. please help :D
*July 3, 2012*