Friday

August 26, 2016
Total # Posts: 520

**Physical Science**

Judy (mass 45.0 kg), standing on slippery ice, catches her leaping dog, Atti (mass 12kg), moving horizontally at 4.0 m/s. Use the conservation of momentum to find the speed of Judy and her dog after the catch.
*September 19, 2013*

**science**

what causes scientific knowledge to change?
*September 11, 2013*

**Math (fractions)**

52 - (x/8) = (x/5)
*August 27, 2013*

**Math**

Find the 40th term in the sequence: 4,-1, -5,-11
*June 10, 2013*

**pre algebra**

I have a cube of 3 by 3 by 3 centimeters , I paint all the surfaces white. After that I'd take my saw, and saw it into cubes of 1 by 1 by 1. I will have 27 cubes after. How many will have no white color on any surface?
*May 20, 2013*

**Chemistry**

The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. Please help it only shows a graph with ...
*May 13, 2013*

**Math**

The expression sin 25° cos 47° + cos 25° sin 47° is equivalent to (1) sin 22° (2)sin 81° (3) cos 22° (4) cos 81°
*May 11, 2013*

**Math**

1. The expression log 5x is equivalent to 2. Write the equation of a polynomial whose sum of the roots equals -3 and the product of the roots equals 9\2? P.S. - I have been trying to solve these problems on my own and have not been successful at it. Can someone please help ...
*May 11, 2013*

**statistics**

okay thank you
*May 8, 2013*

**statistics**

students who learned English as well as another language simultaneously score worse on the SAT critical Reading exam than the general population of test takers? The mean score among all test takers on SAT Critical Reading exam is 501 A random sample of 100 test takers who ...
*May 8, 2013*

**statistics**

so, for the fist part it will be (501-485)/116= .1379? what is the SE?
*May 8, 2013*

**statistics**

do students who learned English as well as another language simultaneously score worse on the SAT critical reading exam than the general population of test takers? the mean score di 501. A random sample of 100 test takers who learned English as another language simultaneously ...
*May 8, 2013*

**Calculus**

A cylinder is inscribed in a right circular cone of height 6.5 and radius (at the base) equal to 6. What are the dimensions of such a cylinder which has maximum volume?
*May 2, 2013*

**Calculus**

A woman at point A on the shore of a circular lake with radius 2.5mi wants to arrive at the point C diametrically opposite A on the other side of the lake in the shortest possible time. She can walk at a rate of 3.25 mi/hr and row at a rate of 2 mi/hr. Find shortest time.
*April 30, 2013*

**Physics**

An electron in the c level of a mercury atom returns to the ground state. Which photon energy could not be emitted by the atom during this process?
*April 25, 2013*

**Chemistry**

Calculate the molar mass of a diprotic acid. The reaction reaches the endpoint of the titration with NaOH at 28ml. The initial concentration of NaOH is 0.09792. and the initial mass of the diprotic acid is 0.685g. How do you get to the final answer? All of the options are ...
*March 31, 2013*

**Math**

One jar of peanut butter and 3 loaves of bread cost $6.70. Three jars of peanut butter and 1 loaf of bread cost $9.32. Find the cost of a jar of peanut butter and a loaf of bread.
*March 23, 2013*

**physics**

A charged particle with a charge-to-mass ratio of |q|/m = 5.7 × 108 C/kg travels on a circular path that is perpendicular to a magnetic field whose magnitude is 0.86 T. How much time does it take for the particle to complete one revolution?
*March 12, 2013*

**Physics**

F=ma F=10x.1 F=.1N
*March 12, 2013*

**Budgeting**

A quaint but well-established coffee shop, the Hot New Café, wants to build a new café for increased capacity. It’s expected sales are $800,000 for the first 5 years. Direct costs including labor and materials will be 50% of sales. Indirect costs are ...
*March 9, 2013*

**math**

A rectangular photograph is mounted on a rectangular card. There is a border ofequal width around the photograph. The perimeter of the card is 40 centimeters longer than that of the photograph. Find the width of the border in centimeters.
*March 5, 2013*

**math**

A rectangular photograph is mounted on a rectangular card. There is a border ofequal width around the photograph. The perimeter of the card is 40 centimeters longer than that of the photograph. Find the width of the border in centimeters.
*March 5, 2013*

**math**

The owner of a luxury motor yacht that sails among the 4000 Greek islands charges $430 per person per day if exactly 20 people sign up for the cruise. However, if more than 20 people (up to the maximum capacity of 90) sign up for the cruise, then each fare is reduced by $4 per...
*February 24, 2013*

**physics**

The membrane that surrounds a certain type of living cell has a surface area of 4.9 x 10-9 m2 and a thickness of 1.2 x 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.5. (a) The potential on the outer surface of the ...
*February 18, 2013*

**MATH**

7s-5s+10<30 &what work would i do to get this. Thankyou!
*February 6, 2013*

**math 209**

.78=2(3.14)*sqrt.5/g solve for g
*February 5, 2013*

**math 209**

the time t for a pendulum to swing back and forth once is called its period and is given by t=2pi*sqrt l/g where l equals the length of the pendulum solve for g
*February 5, 2013*

**stoichiometry**

How many liters of H2 are required to react completely with 5.7 liters of O2?
*February 4, 2013*

**college mathematics**

This is not how the problem is worded. This is the problem. Three different people are to be selected at random, and each will be given one gift card. There is one card from Home Depot, one from Best Buy, and one from Red Lobster. The first person selected gets to choose one ...
*February 4, 2013*

**chemistry**

Tell how to make a 1 M solution of Mg3(PO4)2 and a 0.1 M solution of CaSO4.
*January 25, 2013*

**Math**

factor √7x^2-16√7
*January 14, 2013*

**math**

which is equal to 435 in? A. 37ft B.36ft C.12yd 3 in D.12ft 3in
*January 3, 2013*

**Physics**

As a box is pushed 30 meters across a horizontal floor by a constant horizontal force of 25 newtons, the kinetic energy of the box increases by 300 joules. How much total internal energy is produced during this process?
*December 9, 2012*

**math**

The management of Ditton Industries has determined that the daily marginal revenue function associated with selling x units of their deluxe toaster ovens is given by the following, where R '(x) is measured in dollars/unit. R '(x)=-0.1x-40 (a) Find the daily total ...
*December 3, 2012*

**math**

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p=-0.01x^2-0.1x+6 Determine the consumers' surplus if the wholesale ...
*December 3, 2012*

**math**

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p=-0.01x^2-0.1x+6 Determine the consumers' surplus if the wholesale ...
*December 2, 2012*

**math**

Phillip, the proprietor of a vineyard, estimates that the first 9600 bottles of wine produced this season will fetch a profit of $5 per bottle. However, the profit from each bottle beyond 9600 drops by $0.0002 for each additional bottle sold. Assuming at least 9600 bottles of ...
*November 30, 2012*

**math**

thanx! :) i got it!
*November 30, 2012*

**Stats**

In one study of smokers who tried to quit smoking with nicotine patch therapy, 36 were smoking after one year after the treatment, and 34 were not smoking one year after the treatment. Use a 0.10 significance level to test the claim that among smokers who try to quit with ...
*November 26, 2012*

**Physics**

A soccer ball kicked on a level field has an initial vertical velocity component of 15 meters per second. Assuming the ball lands at the same height from which it was kicked, what is the total time the ball is in the air? [Neglect friction.]
*November 14, 2012*

**Math**

Find the absolute maximum value and the absolute minimum value, if any, of the following function. f(x)=1/x^2+2x+8 on [-2,1]
*November 9, 2012*

**math**

what is two equvalent fractions of 8 over 36
*November 5, 2012*

**Physics- Someone Please Help!!!**

For a I am getting 43 and I don't think that is right and for b I am getting 12 and I don't think that is right either. Are your values any where close to mine?
*October 29, 2012*

**Physics- Someone Please Help!!!**

A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
*October 29, 2012*

**Physics URGENT!!!**

A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
*October 28, 2012*

**Physics- PLEASE HELP**

A luggage carousel at an airport has the form of a section of a large cone, steadily rotating about its vertical axis. Its metallic surface slopes downward toward the outside, making an angle of 21.0° with the horizontal. A 37.0 kg piece of luggage is placed on the ...
*October 27, 2012*

**Physics**

3. A 2000 kg sports car moves in a horizontal circular path of 150 m\radius at a constant speed of 80 m\s. a. magnitude of centripetal acceleration b. magnitude of centripetal force
*October 23, 2012*

**Physics**

A cannon ball is fired with a velocity of 200 m\s2 at an < of 25° above ground. The total flight time is 45.6 seconds. (Neglect air resistance.) a. Calculate the initial horizontal\vertical components of the velocity b. Calculate maximum height of the cannon ball above ...
*October 23, 2012*

**Physics**

1. A rescue plane flying horizontally at an altitude of 500 m and velocity of 300 m\s east drops a food supply packet to plane crash survivors on the ground. The packet falls freely to the ground without a parachute. Assume that the weather is perfect. a. Calculate the time it...
*October 23, 2012*

**Geometry Student**

if m<FGE = 5x+10, find x sp that FC and AE are perpendicular
*October 16, 2012*

**accounting**

18. Balance sheet and income statement data indicate the following: Bonds payable, 6% (issued 2000, due 2020) $1,200,000 Preferred 8% stock, $100 par (no change during the year) 200,000 Common stock, $50 par (no change during the year) 1,000,000 Income before income tax for ...
*October 2, 2012*

**Science 8R - Homework Check**

2000m= 200000cm The rest are correct!
*September 24, 2012*

**Math 8R - Help!!!!**

Hours x pay per hour= total pay 6 2/3 x 27=v 180 dollars
*September 24, 2012*

**Physics**

A diver springs upward from a board that is 4.40 m above the water. At the instant she contacts the water her speed is 14.0 m/s and her body makes an angle of 68.8 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and...
*September 24, 2012*

**Physics **

The drawing shows an exaggerated view of a rifle that has been ‘sighted in' for a 91.4-meter target. If the muzzle speed of the bullet is v0 = 392 m/s, there are the two possible angles θ1 and θ2 between the rifle barrel and the horizontal such that the ...
*September 24, 2012*

**math**

11, 121
*September 24, 2012*

**physics**

Nevermind, I figured it out. Thanks.
*September 23, 2012*

**physics**

A major-league pitcher can throw a ball in excess of 36.2 m/s. If a ball is thrown horizontally at this speed, how much will it drop by the time it reaches a catcher who is 17.0 m away from the point of release? I got -1.08 for the answer but my book is saying its wrong! ...
*September 23, 2012*

**physics**

The drawing shows an exaggerated view of a rifle that has been ‘sighted in' for a 91.4-meter target. If the muzzle speed of the bullet is v0 = 392 m/s, there are the two possible angles θ1 and θ2 between the rifle barrel and the horizontal such that the ...
*September 23, 2012*

**physics**

A diver springs upward from a board that is 4.40 m above the water. At the instant she contacts the water her speed is 14.0 m/s and her body makes an angle of 68.8 ° with respect to the horizontal surface of the water. Determine her initial velocity, both (a) magnitude and...
*September 23, 2012*

**science**

average speed= distance/time 6m/2sec= 3meters/second
*September 23, 2012*

**math**

for this problem multiplication/division should be done first, then addition/subtraction
*September 23, 2012*

**Science (Physics)**

1.A hiker started to walk from her campsite heading east with a velocity of 5 m\s after 6 seconds, she attained a velocity of 7 m\s. What is the average velocity of the hiker? What is the hiker’s acceleration? If the hiker continues walking for another 60 seconds, how far...
*September 20, 2012*

**Chemistry**

filtration is the only possible method.
*September 20, 2012*

**math**

if cos x= 2/5, what is the measure of less than x, to the nearest degree?
*September 4, 2012*

**Pysc**

Benjamin Whorf argued that because the Inuit have many words for snow, A. they have more ways to describe snow than speakers of other languages. B. they have better perceptual skills than speakers with fewer words for snow. C.they have more uses for snow in their culture. D....
*July 4, 2012*

**alg 1**

use the method of substitution to solve the system of linear equation 2x-y=5, 9x-4y=22
*June 13, 2012*

**Math**

(15 - 2x)0, for x = -3
*June 11, 2012*

**math**

3/7 of $250=
*June 5, 2012*

**Math - Functions**

Thanks so much, Mr. Steve!
*May 30, 2012*

**Math - Functions**

Please help! I have a test tomorrow. I've been working on this forever and just can't figure out the equation. Inputs X - 0, 3, 6, 9 Outputs Y - 1, 2, 3, 4
*May 30, 2012*

**Math - Functions**

I've been working on this function for quite awhile and just can't seem to get it. Inputs x 5, 6, 7, ? Outputs y 50, 72, 98, ? I need the equation too. Please help!
*May 21, 2012*

**Math**

I've been working on this function for quite awhile and just can't seem to get it. Inputs x 5, 6, 7, ? Outputs y 50, 72, 98, ? Please help!
*May 21, 2012*

**English II**

Imagination is a basic factor in correct expository writing.
*April 25, 2012*

**Chemistry**

Write a balanced nuclear equation for the positron emission of each of the following nuclei: a) arsenic-74 b) oxygen-15
*April 20, 2012*

**Chemistry**

consider the reaction: N2(g) + O2 (g) --> 2NO (g) removing some of the N2(g) will_____ A) increase the concentration of O2 B) decrease the concentration of O2 C) increase the concentration of NO(g)
*April 20, 2012*

**English**

How would I change these sentences from the passive to active voice? The Epistle to the Hebrews is said to have been written anywhere from 60-95 C.E . The authorship of the Epistle to the Hebrews has been a heavily debated issue since the passage was written, because it is ...
*April 17, 2012*

**health**

What are the implications of this shift for hospitals, consumers, and the health care delivery system as a whole
*March 29, 2012*

**geometry**

Find volume of a cone where the base is a square using 8inches,10inches,and 4inches
*March 26, 2012*

**Algebra**

Mark made a business trip of 290 miles. He averaged 56 mph for the first part of the trip and 60 mph for the second part. If the trip took 5 hours, how long did he travel at each rate?
*March 25, 2012*

**Algebra**

Alice travels 6 times faster than Bill. Traveling in opposite directions, they are 714 miles apart after 6 hours. Find their rates of travel.
*March 25, 2012*

**geometry**

A triangle where the base is a square: what is the volume using 8inches,10inches, and 4inches
*March 24, 2012*

**Satistics**

**I don't want the answer, I want to know how to set the problem up and the formula that I need to use. I am online with a tutor right now, and they can't help me. :-( The average price of a gallon of unleaded regular gasoline was reported to be $2.34 in northern ...
*February 12, 2012*

**Organic Chemistry**

The answer is 0.621 mol of hypochlorous acid because there is a 1:1 molar ratio in the balanced chemical equation.
*February 1, 2012*

**organic chemistry**

The answer is just 6.75 grams of NaOCl. The percentage just means 6.75 grams per 100 grams total with dilution.
*February 1, 2012*

**Ochem**

I would try setting it up as a proportion. The percentage just means that there are 6.65 grams of NaOCl per 100 grams. Therefore, set up the problem of (6.65/100)=(x/12.14)
*February 1, 2012*

**Organic Chemistry**

The answer is much less difficult to find. The answer for your problem is 0.257 mol because there is a 1:1 ratio of hypochlorous acid to 9-fluorenol.
*February 1, 2012*

**physics**

i dont know!!
*January 30, 2012*

**math**

Bert is planning to open a savings account that earns 1.6% simple interest yearly. He wants to earn exactly $160 in interest after 2 years. How much money should he deposit?
*January 25, 2012*

**statistics**

the true value of the population parameter is marked on each histogram,compare the bias of these estimates,and based on the performance of the three statistics in many samples,which is preferred as an estimate of the parameter?justify your answer.
*December 8, 2011*

**art**

what is the role of an artist?
*December 6, 2011*

**science**

what is the role of an artist?
*December 6, 2011*

**sample size/ standard deviations**

Describe the sampling distribution of p(hat). Assume the size of the population is 30,000. n=800, p=0.6 a) Determine the mean of the sampling distribution b) Dtermine the standard deviation of the sampling distribution
*December 1, 2011*

**physical science 11**

whats the force of electrical attraction between a proton and an electron that are 9.5x 10-11
*November 19, 2011*

**chemistry**

3.5g of CuCl2.2H2O were dissolved and reacted with excess Na2SO3 in the presence of HCl. After filtration, 1.5g of CuCl crystals was obtained. Calculate the %yield.
*November 14, 2011*

**Repost Algebra**

What would it cost for ingredients , per cookie, to make 100 cookies? C=100/4x-28 is the equation given to find the cost. (Cost is equal to 100 over 4x minus 28)
*October 24, 2011*

**Chemistry 105**

1.96
*October 23, 2011*

**Science**

On the H-R diagram, red supergiants like Betelguese lie where?
*October 19, 2011*

**Short essay proofreading check**

I like it, but indent, maybe make it two paragraphs when you start talking about how he is self-centered.
*October 19, 2011*

**chemistry**

The principal component of many kidney stones is calcium oxalate,CaC2O4. A kidney stone recovered from a typical patient contains 8.50×10^20 formula units of calcium oxalate. How many moles of CaC2O4 are present in this kidney stone?
*October 19, 2011*