Thursday

May 26, 2016
Total # Posts: 942

**calculus**

Let f be a function defined by f(x)= arctan x/2 + arctan x. the value of f'(0) is? It's 3/2 but I am not very clear on how to obtain the answer. I changed arctan x/2 into dy/dx=(4-2x)/(4sqrt(4+x^2)) but that's as far as I got. Could you please show me how to solve ...
*January 16, 2007*

**Calc**

a) y =ln(x-1) find dy/dx=? b) y=3 ln x - ln (1/x) where x >0, dy/dx= ? My teacher says the answers are a) (2x)/(x^2-1) and b) 4/x I am not sure how you find the derivative when they involve ln. Could you please explain to me how to get these answers? I have a quiz on them ...
*January 16, 2007*

**physics**

A 30g bullet with a horizontal velocity of 500m/s comes to a stop 12 cm within a solid wall. a) what is the change in its mechanical energy? b) What is the magnitude of the average force from the wall stopping it? a) what would I use of the equation? Can you please explain ...
*January 10, 2007*

**physics**

A 12 kg block is released from rest on a 30 degree fricitonless incline. Below the block is a spring that can be compressed 2 cm by a force of 270 N. The block momentarily srops when it compresses the spring by 5.5 cm. a) How far does the block move down the incline from its ...
*January 5, 2007*

**physics**

A 1.5 kg snowball is fired from a cliff 12.5m high with an inital velocity of 14 m/s directed 41 degrees above the horizontal. a) how much work is done on the snowball by the gravitaitonal force during its flight to the flat ground below the cliff? b) what is the change in the...
*January 4, 2007*

**physics**

A small block of mass m can slide along the frictionless loop-the loop. The block is released from rest at point P, at height h =5R above teh bottom of the loop. How much work does the gravitational force do on the block as teh block travels from point P to a) point Q (which ...
*January 4, 2007*

**Physics**

What is the spring constant of a spring that stores 25 J of elastic potential energy when compressed by 7.5 cm from its relaxed length? I know that I should chnage 7.5 cm into .075 m. Is this equation correct? U(x)= 1/2kx^2. I should have gotten 89N/cm for the correct answer ...
*January 2, 2007*

**Physics**

You drop a 2 kg textbook to a friend who stands on the ground 10m below the testbook with outstreatched hands 1.5m above the ground. a) how much work W_g is done on the textbook by the gravitational force as it drops to your friend's hands? b)What is the change in the ...
*January 2, 2007*

**calculus**

Let f(x) = (x+1)/(x-1). Show that there are no vlue of c such that f(2)-f(0) =f'(c)(2-0). Why does this not contradict the Mean Value Theorem? I plugged 2 and 0 into the original problem and got 3 and -1 . Then I found the derivative to be ((x-1)-(x+1))/(x-1)^2. Whould ...
*December 17, 2006*

**Science**

1b 2c
*December 12, 2006*

**Organic chemistry!!!Need helpp!!!**

1. Consider the effect of water concentration on rate of the reaction in water and acetone. WOuld you predict that the rate would be greater or less in the presence of a higher concentration of water? Explain your answer, using the structure of the transition state. 2. ...
*December 10, 2006*

**Organic chemistry!!!Need helpp!!!**

1. Consider the effect of water concentration on rate of the reaction in water and acetone. WOuld you predict that the rate would be greater or less in the presence of a higher concentration of water? Explain your answer, using the structure of the transition state. 2. ...
*December 10, 2006*

**Math**

For two consecutive integers, the sum of the smaller and twice the larger is 38. What are the integers? Plz explain. Thanks 2(a+b)=38 Therefore: a+b+(2(a+b)=38 a+b+2a+2b=38 3a+3b=38 3(a+b)=38 I got as far a here. I dont know if this helps. My last stop may be worng. This might...
*November 29, 2006*

**Opinion needed plz!!**

Is the algebraic model more better to use than the systematic trial model? Why?? thanks When it comes to algebra it depends on what is easier for you.
*November 28, 2006*

**the scarlet letter genre**

it is a romantic drama
*October 31, 2006*

**Math**

how to do a sub n=n+1 over 4 12+6=
*October 26, 2006*

**Owen**

How to do a+d=f
*October 26, 2006*

**grammar**

Although heated in the microwave, I found the center of the pizza cold.
*October 10, 2006*

**Shakespeare 2**

yes
*October 8, 2006*

**phys.**

Hey, i feel kinda embarassed asking this because it looks so simple. a mass of 300kg which is positioned 1000m above the ground is allowed to fall to the ground. what will be its velocity on impact? Use the basic velocity formula. Initial velocity is zero; solve for final ...
*October 7, 2006*

**Physics**

Use the definition of scalar product( vector A* vector B = abcos theda and the fact that vector A * vector B = axbx+ ayby+azbz to calculate the angle between the two vectorgiven by vector A= 3i + 3j + 3k and vector B= 2i + 1j + 3k. The book said the answer is 22 degreess but I...
*October 6, 2006*

**physics**

Vector A has the magnitude of 12 m and is angled 60 degrees counterclockwise from the positive direction of the x axis of an xy plane. Also vector b = 12i + 8j on that same corrdinate system. We now rotate the system counterclockwise about the orgin by 20 degrees to form a new...
*October 6, 2006*

**Physics**

Vector a has a magnitude of 5 m and is directed esast. Vector b has a magnitude of 4 m and is directed 35 degrees west of north. What are the (a) magnitude and (b) the direction of vector a + vector b? What are the (c)magnitude and (e)direction of vector b - vecotr a? (f) Draw...
*October 4, 2006*

**Physics**

The two vectors a and b have equal magnitudes(on an x-y plane vector a is 30 degrees from the x axis then vector b is 75 degrees from the head of vector a it is heading towards north west) of 10m A)find the x component of their vector sum r B)find the y component of their ...
*October 2, 2006*

**Identifying controls and Variables**

control-group b imdependant-group a
*October 1, 2006*

**thank you live experts**

hey jiskha live experts i just wanted to thank you for all the help. you guys are the best! by the way, I will try to learn more English, thanks! Many thanks. Thanks for posting.
*September 17, 2006*

**Chemistry**

The population of San Francisco is 750,000 in an area of 49 square miles. What is the population density in San Francisco? Express your answer in people per acre. ( 1mi(squared) = 640 acres ) 49 sq mi x (640 acres/1 sq mi) =?? acres. (Note that sq mi cancels leaving acres.) ...
*September 13, 2006*

**Algebra**

How do you get the vertex of this absolute value? y = -2 |4x - 1| + 16 By vertex you mean the highest point. Find out where the expression inside the absolute value is 0. Since the absolute value is always positive, in this expression some quantity is being subtracted from 16...
*September 10, 2006*

**algebra 1**

if you go from one point to the other do you subract the a and b or do you do all points in between to find the elevation? I'm not sure what this question refers to. Are you trying to calculate slopes?
*September 5, 2006*

**English/European history**

In Machiavelli's, The Prince, what does Machiavelli consider the ideal economy? The ideal economy, according to Machiavelli, is one in which there is little or no taxation. Thus the public is free to prosper as much as he or she desires, without any concern that the ...
*September 3, 2006*

**History**

How is Southern, Middle, and New England colonies devided? Where is an area known as "tidewater" VA? Since this is not my area of expertise, I searched Google under the key words "Southern middle New England colonies" to get these possible sources: http://...
*August 30, 2006*

**English**

what could be some reasons to why abstract language is used? One reason is that the concept that is being dealt with is abstract. They cannot be sensed directly as can apples, grasshoppers and bricks. Concepts like freedom, evil, beauty, truth and love are abstract. I hope ...
*August 28, 2006*

**Math**

how do you solve for y in the expression: x^3=y(y+3)? x^3=y^2 + 3y y^2+3y- x^3=0 Using the quadratic formula.. y= (-3+-sqrt(9+4x^3) )/2
*August 24, 2006*

**English**

the question asks me to describe the writer's style (serious, sarcastic, etc.) what could be some other answers to this question? Style has to do with HOW writers use words and sentences, as well a how they construct sentences, paragraphs, etc. Style can be formal, ...
*August 23, 2006*

**Algebra**

Solve for s: h=(square root of 3)times s/2 and solve for h V= (pi)r squared h / 3 Solve for s: h=(square root of 3)times s/2 Multiply both sides by 2. 2h = (sqrt 3)*s*2/2 which cancels the 2 on the right. 2h = (sqrt 3)*s Now divide the right side by everything except what you...
*August 17, 2006*

**Algebra**

Could someone please help me find x in this problem and explain how you got the answer? 2(3x - 1) = 5 - (x + 3) I checked the answer I got in the back of my algebra book and it said the answer was 4/7 but my answer was wrong. How did they get 4/7 out of this? 2(3x - 1) = 5 - (...
*August 12, 2006*

**orientalism of muslim and arab american**

LOL... Same school. Same question. Same problem. Different year ;-)
*August 6, 2006*

**orientalism of muslim and arab american**

LOL... Same school, same question, same issue!!! Different year ;-)
*August 6, 2006*

**Ethnics**

Not my email.. my user name.. tried to do my email, to be found easier, but the site prevents it.. Anyways.. Good luck everyone!! YEA UOP!!!!
*July 20, 2006*

**Ethnics **

LMAO! Soo Hilarious! Another Ethnics Student from AXIA!! YAY!! Thanks for all the help, I read the dang chapter and had like 100 words already on how one could measure prejudice but I was trying to find out more of an correct answer through the chapter. LMAO! Anyways, feel ...
*July 20, 2006*

**ICT**

I need to write an essay to explain 'why companies use logos'. Help me. Companies' logos help sell their products. Long before they can read, small children recognize the McDonald's big M and know that it means hamburgers and treats. Think about other logos you...
*June 12, 2006*

**ICT**

help i need to write an essay explaining 'why companies use logos'. yours sincerely, Jamie
*January 2, 2006*