Leanna
Most popular questions and responses by Leanna
Physics
A 20 kg crate is placed on a horizontal conveyor belt. The materials are such that us = 0.47 and uk = 0.21. What is the maximum acceleration the belt can have without the crate slipping? If acceleration of the belt exceeds the value determined in part A,
asked on March 3, 2013 
Physics
A fastmoving superhero in a comic book runs around a circular, 70mdiameter track five and a half times (ending up directly opposite her starting point) in 3.0s. What is her angular speed, in rad/s?
asked on March 8, 2013 
Probability
With her box of 64 crayons, your little sister decides to draw a picture of the family: herself, you, and your parents. How many different ways could she find to give you all hair colors?
asked on November 10, 2011 
math
You find a sales receipt from a store that shows the total price as $40, and the total amount paid including sales tax as $42. a. Write an equation you can use to find the sales tax rate which is r. what is the equation so I tried all things I could think
asked on February 6, 2017 
Physics
A 23 kg child goes down a straight slide inclined 38 degrees above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction.
asked on March 3, 2013 
Calculus
A smokestack deposits soot on the ground with a concentration inversely proportional to the square of the distance from the stack. With two smokestacks d miles apart, the concentration of the combined deposits on the line joining them, at a distance x from
asked on March 26, 2016 
Physics
A combination lock has a 1.2 cm diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction
asked on April 1, 2013 
Calculus
Let f be a twicedifferentiable function such that f(2)=5 and f(5)=2. Let g be the function given by g(x)= f(f(x)). (a) Explain why there must be a value c for 2 < c < 5 such that f'(c) = 1. (b) Show that g' (2) = g' (5). Use this result to explain why
asked on February 7, 2011 
worksheet help
what was unusual about the horse breeding magazine
asked on March 9, 2009 
AP Calculus
Consider the curve given by x^2+4y^2=7+3xy a) Show that dy/dx=(3y2x)/(8y3x) b) Show that there is a point P with xcoordinate 3 at which the line tangent to the curve at P is horizontal. Find the ycoordinate of P. c) Find the value of d^2y/dx^2 (second
asked on January 26, 2011 
Probability
With her box of 64 crayons, your little sister decides to draw a picture of the family: herself, you, and your parents. How many different ways could she find to give you all hair colors?
asked on November 10, 2011 
Physics
1. At what height above the earth is the freefall acceleration 30% of its value at the surface? 2. What is the speed of a satellite orbiting at that height?
asked on March 24, 2013 
Chemistry :/
Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of
asked on March 7, 2015 
Calculus  Still Need Help! Anyone!
A particle moves along the xaxis with position at time t given by x(t)=e^(t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you
asked on November 29, 2010 
Calc
When pi/2
asked on July 15, 2011 
General Chemistry II
A quantity of ice at 0 degrees celcius is added to 64.3 grams of water in a glass at 55 degrees celcius. After the ice melted, the temperature of the water in the glass was 15 degrees celcius. How much ice was added? The heat of fusion of water is
asked on January 20, 2011 
Physics
A conical pendulum is formed by attaching a 0.60kg ball to a 1.0m long string, then allowing the mass to move in a horizontal circle of radius 30cm. 1. What is the tension in the string 2. What is the ball's angular velocity in rpm?
asked on March 21, 2013 
Calculus
The table below shows some values of a linear function f and an exponential function g. Fill in exact values for each of the missing entries. X 0 1 2 3 4 f(x) 25 375 g(x) 25 375
asked on January 19, 2016 
Physics
Two 2.9cmdiameter electrodes with a 0.15mmthick sheet of Teflon between them are attached to a 9.0 V battery. Without disconnecting the battery, the Teflon is removed. a) What are the electric field after the Teflon is removed?
asked on October 6, 2013 
social studies
How did minoans and Mycenaeans make a living? Who was Socrates most well known student? What was the name of the book plato wrote?
asked on January 17, 2012 
Chemistry
A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of
asked on December 9, 2015 
Physics
The ultracentrifuge is an important tool for separating and analyzing proteins in biological research. Because of the enormous centripetal accelerations that can be achieved, the apparatus must be carefully balanced so that each sample is matched by
asked on March 24, 2013 
Calculus
A cubic polynomial function f is defined by f(x) = 4x^3 + ax^2 + bx + k? A cubic polynomial function f is defined by: f(x) = 4x^3 + ax^2 + bx + k where a, b, and k are constants. The function f has a local minimum at x= 1, and the graph of f has a point
asked on February 9, 2011 
Physics
A combination lock has a 1.2 cm diameter knob that is part of the dial you turn to unlock the lock. To turn that knob, you grip it between your thumb and forefinger with a force of 0.62 N as you twist your wrist. Suppose the coefficient of static friction
asked on March 31, 2013 
Physics
Suppose you wish to make a vertical leap with the goal of getting your head as high as possible above the ground. At the top of your leap, your arms should be... a. held at your sides. b. raised above your head. c. outstretched, away from your body.
asked on April 1, 2013 
Calculus
Let f be the function defined for x >or= to 0 with f(0)=5 and f', the first derivative of f, give by f'(x)=e^(x/4)sin(x^2). A) Use the graph of f' to determine whether the graph of f is concave up, concave down, or neither on the interval 1.7
asked on February 9, 2011 
Calculus
A cubic polynomial function f is defined by f(x) = 4x^3 + ax^2 + bx + k? A cubic polynomial function f is defined by: f(x) = 4x^3 + ax^2 + bx + k where a, b, and k are constants. The function f has a local minimum at x= 1, and the graph of f has a point
asked on February 8, 2011 
chem
a 275mL sample of vapor in equilibrium with 1propylamine at 25C is removed and dissolved in 0.500L of H20. For 1propalamine, Kb=3.72*10^4 and the vapor pressure at 25C is 215 torr. (a)What should be the pH of the aqueous solution? (b) How many mg of
asked on March 22, 2011 
Organic Chemistry
I have the linear formula of CH3CH2OLi and I'm trying to draw the structure with charges. Not really sure how. Please help.
asked on September 18, 2012 
Biology
You are supposed to add 0.1 mol of a substance with molecular weight = 354.9 to 1 liter of water. How much should you add? Choose one.
asked on October 20, 2011 
Chemistry
A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of
asked on December 9, 2015 
Calculus
When a ball is thrown straight down from the top of a tall building, with initial velocity 30 ft/sec, the distance from the release point at time t in seconds is given by s(t)=16t^2+30t. If the release point is 300 ft above ground, what is the velocity of
asked on October 26, 2010 
Physics
So for each of the statements we have to write true or rewrite the part in Caps to make the sentence true. I'm only stuck on a couple. 1. On a positiontime graph, the average velocity equals the run MULTIPLIED by the rise. 2. A child drops a ball. The
asked on February 3, 2011 
Chemistry
Experiment 1 results: mass of crucible 88g mass of hydrate 93g mass of salt 91.196g 1. Calculate the following: a:mass of water in the hydrate sample (g) b:number of moles of water in the sample c:mass of pure salt in the sample (g) d:number of moles of
asked on March 7, 2015 
Calculus
If the function f is defined by f(x)=x^22x, find limit h>0 (f(3+h)(f(3h))/2h
asked on September 21, 2010 
Science Help!
How much heat is needed to cause the following irreversible reaction? 200 g of liquid H2O at 50°C is heated to form 200 g of steam at 120°C
asked on October 22, 2012 
Biology
In goats, the allele for black hair is dominant to that for red. Two black haired goats mated, producing twelve offspring. Of the first eleven, 8 had black hair and 3 had red hair. What is the probability of the twelfth offspring having red hair?
asked on October 16, 2011 
12th Grade Calculus
When a ball is thrown straight down from the top of a tall building, with initial velocity 30 ft/sec, the distance from the release point at time t in seconds is given by s(t)=16t^2+30t. If the release point is 300 ft above ground, what is the velocity of
asked on October 27, 2010 
Caclulus, bobpursley HELP!
Sorry for bothering you on this one question but I just replied to my original problem if you could help me with that.
asked on September 21, 2010 
math
Lee wants to cut this piece of canvas into two rectangles that are 3×2 and 3×5. He wants the sum of the two small recyangles to be the same as the area of the large rectangle. Can he do this? Explain the rectangle is 6feet across and 3feet tall
asked on April 29, 2015 
Calculus
I don't know how to do the integral of e^(lnx^2)dx and the integral of (sin sqrtx)/(sqrtx) dx
asked on April 11, 2011 
12th Grade Vocabulary
We have to pick which sentence the vocabulary word is used incorrectly. Vocab Word: Verity a) Many people trusted the VERITY of the accused spies Ethel and Julius Rosenberg, but the defendants were convicted and executed for espionage in 1953. b) Although
asked on November 21, 2010 
12th Grade English
We have to find the synonym of the word in bold. I have a few choices but I'm stuck between two.. The words in bold are incumbent upon the phrase reads: incumbent upon all officials Deciding to choose between a) the duty of b) the term of office of
asked on November 21, 2010 
Calculus..Need Help Soon
If f(x)=1x^3 and f^1 is the inverse of f, how many solutions does the equation f(x)=f^1(x) have? a)none b)one c)three d)five e)six
asked on September 12, 2010 
Math AP Calc
In 1951, the population of India was 357 million people. By 1981 it had grown to 984 million. If the population is growing exponentially, when (in what month of what year) will the population reach 1 billion people?
asked on August 29, 2010 
AP Calculus
Find the total area enclosed by the graph of y=(e^sinx)*(cosx) and the xaxis from x=0 to x=pi I got .0563331993 but when I checked it graphically I got 3.22765
asked on March 6, 2011 
American Government
I have to do a 5 minute presentation on George Washington and I have to focus on his contributions towards the Constitution. All the sites I go to have pretty much the same information. Does anyone have sites that could help me?
asked on September 21, 2010 
math
a woman had 400 oranges in a basket. after selling 1/5 of them, she found that 1/8 of the remainder were bad. how many of the remainder were good?
asked on February 9, 2013 
math
how do you write 4/5, 5/12, 3/10 in its simpliest form?
asked on January 18, 2013 
AP Calculus
Determine dy/dx if xsiny=artany i did (x)(cosy dy/dx) so far
asked on March 23, 2011 
Calculus
Find all points on the graph of f(x)=xe^x at which the tangent line is parallel to the line y3x=4. i figured out that f'(x)=3 but i don't know what to do with that.
asked on November 30, 2010 
Calculus!!!!
A particle moves along the xaxis with position at time t given by x(t)=e^(t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you
asked on November 29, 2010 
Calculus
A particle moves along the xaxis with position at time t given by x(t)=e^(t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you
asked on November 29, 2010 
Calculus, bobpursley!
This has to do with my last Calculus problem. I need help on it..The part I replied to after you answered the question.
asked on September 21, 2010 
Calculus..Need Help Soon
If the solutions of f(x)=0 are 1 and 2, then the solutions of f(2x)=0 are a)1 and 2 b) 1/2 and 1 c) 2 and 4 d)2 and 4 2)1/2 and 1
asked on September 12, 2010 
Calculus
A rational function g has the lines x=2 and x=2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x). So I got g(x)=(4x^216x+12)/(x^24) Is this correct Math Mate?
asked on September 6, 2010 
Calculus
Solve for x if 5+lnx=14/lnx.
asked on September 6, 2010 
Calculus
A rational function g has the lines x=2 and x=2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x).
asked on September 6, 2010 
Math
In 1951, the population of India was 357 million people. By 1981 it had grown to 984 million. If the population is growing exponentially, when (in what month of what year) will the population reach 1 billion people? How do you know what month? Reiny
asked on August 29, 2010 
Art
I'm in art and i cant draw a bear do you have any tips?
asked on September 24, 2013 
Math
The size of a bacteria population is given by P=C*e^(kt) Where C is the initial size of the population, k is the growth rate constant and t is time in minutes. a) If the bacteria in the population double their number every minute, what is the value of k? I
asked on March 6, 2012 
Algebra
How do you do long division of ((5x^4)2)/(3x^2) _______ 3x^25x^42
asked on April 11, 2011 
AP Calculus
I previously posted this but had a mistake in it. Determine dy/dx if xsiny=arctany i did (x)(cosy dy/dx)+(1)(siny)=dy/(1+y^2) so far
asked on March 23, 2011 
Calculus
Find all points on the graph of f(x)=xe^x at which the tangent line is parallel to the line y3x=4. i figured out that f'(x)=3 but i don't know what to do with that.
asked on November 30, 2010 
12th grade Calculus
It says find the numbers, if any, at which the given function is discontinuous. f(x)=abs(x+2) *abs  absolute value f(x)=e^xsinx for both of these problems i saw that it was continuous but i don't really know
asked on October 5, 2010 
US Government
Society operates more efficiently if government power is centralized. What reasons exist for continuing federalism in its current form? In other words, defend a federal system of government.
asked on October 3, 2010 
Calculus..Need Help Soon
If x=1 and x=2 are zeros of f(x)=3X^3+Ax^2+Bx+2, then the value of A+B is a)1, b)1, c)9, d)9, e) cannot be determined I think it can't be determined but i don't know!
asked on September 12, 2010 
Calculus (Reiny or MathMate)
A rational function g has the lines x=2 and x=2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x). So I got g(x)=(4x^216x+12)/(x^24) Is this correct
asked on September 6, 2010 
Math, Still Need Help!
Label each statement TRUE or FALSE. a. The sum of two onetoone functions is onetoone. b. The product of two onetoone functions is onetoone. c. If f is a onetoone function and k is a real number (constant), then the function g(x)=k*f(x)is
asked on August 29, 2010 
Earth Science
What are 3 examples of graphing natural phenomenas? How would you predict their future occurences? One could graph the occurance of celestial bodies, such as the moon, sun, etc. Or graph the location of Vega, by hour. Or graph comets. You could graph
asked on October 2, 2006 
math
when a ball is dropped, it bounces back up 4/5 of the height from the height it was dropped.If the ball dropped from a height of 200cm, how high does it go after bouncing twice.
asked on February 9, 2013 
Calculus
A particle moves along the xaxis with position at time t given by x(t)=e^(t)sin(t) for 0 is less than or equal to t which is less than or equal to 2 pi. a) Find the time t at which the particle is farthest to the left. Justify your answer I think you
asked on November 29, 2010 
English  Beowulf
So we just started reading Beowulf at school and we're around ch 8. Our question to answer was Whose account of Beowulf and Brecca's swimming match is more credible/believable and why? This is referring to Unferth's and Beowulf's stories. I said that
asked on September 23, 2010 
Math
A rational function g has the lines x=2 and x=2 as vertical asymptotes, the line y=4 as a horizontal asymptote, and numbers 3 and 1 as zeros. Find a formula for g(x). So I got g(x)=(4x^216x+12)/(x^24) Is this correct
asked on September 6, 2010 
Calculus
If f is a polynomial function of degree 3 with the numbers 4,5, and 6 as zeros, and if f(1)=210, determine the formula for f(x).
asked on September 6, 2010 
MathReiny Help! Previous Problem
In 1951, the population of India was 357 million people. By 1981 it had grown to 984 million. If the population is growing exponentially, when (in what month of what year) will the population reach 1 billion people? How do you know it's the 6th month?
asked on August 29, 2010 
Microeconomis
Why is much more profitable for a company to bring to market a new product than secon? While your statement is generally true, it is not always true. The producer of a new product MAY enjoy some monopoly power for a time. Makers of an existing product are,
asked on November 6, 2006 
Calculus
Suppose that f(t)=Qoa^1=Qo(1+r)^t with f(4)=72.2 and f(10)=176.7. Find what a is and what r is.
asked on January 19, 2016 
math
I im learningabout fractions is there an faster or easier way i can do them?
asked on September 24, 2013 
Calc
I need help solving this problem. logbase5(x+2)=2
asked on July 12, 2011 
Calculus
I need help with integrals and I need help with the problem. Integral of 4/sqrt(x)dx
asked on April 11, 2011 
Please Help! Calculus
We have to find out which of these statements are true. I narrowed it down to 2 answers. a) if f"(0)=0, the the graph of f changes concavity at x=0 b) If the function f is continuous on the interval [a,b] and the integral from a to b of f(x)dx=0, then f
asked on November 22, 2010 
Calculus
It says find the numbers, if any, at which the given function is discontinuous. f(x)=abs(x+2) *abs  absolute value f(x)=e^xsinx for both of these problems i saw that it was continuous but i don't really know
asked on October 5, 2010 
Calculus, need help again...
If the function f is defined by f(x)=x^22x, find limit h>0 (f(3+h)(f(3h))/2h
asked on September 21, 2010 
Math AP Calc
Label each statement TRUE or FALSE. a. The sum of two onetoone functions is onetoone. b. The product of two onetoone functions is onetoone. c. If f is a onetoone function and k is a real number (constant), then the function g(x)=k*f(x)is
asked on August 29, 2010 
Math AP Calc
The population of New Hampshire was 1 million in 1990. It doubles every 25 years. Estimate the population in 1996.
asked on August 29, 2010

Math
144
posted on June 2, 2018 
Chemistry
idk man
posted on February 27, 2018 
algebra
The cost in dollars, C, of renting a carpet cleaner is given by the linear equation C = 20 + 25x, where x is the number of days. Use this model to find the cost of renting the unit for 11 days.
posted on October 6, 2015 
Chemistry :/
Formulas for experiment 1: CuSO4*5H2O CuSO4.XH2O > CuSO4 + XH2O Formulas for experiment 2: MgCl2·6H2O MgCl2 * X H2O = MgCl2 + X H2O I just need someone to check my answers please :)
posted on March 7, 2015 
Chemistry :/
These are the calculations I can up with for experiment 1: a:mass of water in the hydrate sample (g) 1.804g b:number of moles of water in the sample 0.100g c:mass of pure salt in the sample (g) 3.196g d:number of moles of salt in the sample .0214g e:molar
posted on March 7, 2015 
math
There are 144 perfect pumpkins.
posted on October 26, 2013 
math
OH THATS EASY XD well how much is in a millimeter? you need to find that out then..............yea that's all i got i think you x the number of what you got of the milliter and x it by 30
posted on September 24, 2013 
math
MRS SUE ty for your time o.o
posted on September 24, 2013 
Physics
(23kg)(9.8m/s^2)(cos(38)) = 177.6N
posted on March 3, 2013 
Grammar MT
It actually depends on account instructions on dropping the 's. Both are correct.
posted on April 23, 2012 
Biology
The options are: 3.549 g 35.49 g 35.49 mg 0.1 g 0.1 mg
posted on October 20, 2011 
Calc
Thank you so much!
posted on July 12, 2011 
Calculus
Thanks for help on 1. on 2. if i do u=sqrt(x) my du is 1/2x^(1/2) and that means my du is in the denominator. So it would read 2integral of sin(u)/du
posted on April 11, 2011 
Calculus
oh wow thank you so much!! that makes sense!!
posted on April 11, 2011