Sunday

August 2, 2015

August 2, 2015

Total # Posts: 3,312

**physics**

The angular speed of the rotor in a centrifuge decreases from 226 to 186.0 rev/s with an angular deceleration of 6.4 rev/s2. During this period, how many revolutions does the rotor turn?
*July 29, 2013*

**Business; Finance**

Texas Wildcatters Inc. (TWI) is in the business of finding and developing oil properties, and then selling the successful ones to major oil refining companies. TWI is now considering a new potential field, and its geologists have developed the following data, in thousands of ...
*July 25, 2013*

**Math**

What would be the amount of compound interest on $8,000 invested for one year at 6%, compounded quarterly?
*July 21, 2013*

**math-statistics**

The following risk ratios give the increased risk for various diseases comparing two groups (exposed vs. unexposed). a. 2.5 (2.0, 3.0) b. 1.03 (1.02, 1.04) c. 6.0 (.85, 9.8) d. 0.98 (0.88, 1.08) e. 0.20 (.05, 1.05) Which risk ratios are statistically significant at the 0.05 ...
*July 17, 2013*

**math**

A box contains 5 blue and 4 red marbles. In how many ways can 4 marbles be drawn so as to include 2 red marbles?
*July 17, 2013*

**Chemistry**

The solubility of AgCl (s) is 2.5 x 10^-5 M. calculate the ksp
*July 10, 2013*

**Statistics**

The following risk ratios give the increased risk for various diseases comparing two groups (exposed vs. unexposed). a. 2.5 (2.0, 3.0) b. 1.03 (1.02, 1.04) c. 6.0 (.85, 9.8) d. 0.98 (0.88, 1.08) e. 0.20 (.05, 1.05) Which risk ratios are statistically significant at the 0.05 ...
*July 9, 2013*

**Statistics**

How would a histogram change if we increase the number of simulations? A. It would simply be more smooth. B. The p-value would get smaller. C. The standard error would get smaller. D. The distribution would be more similar to a T-distribution.
*July 8, 2013*

**Statistics**

The Centers for Disease Control (CDC) collects yearly statistics on drinking behavior in the United States by surveying a random sample of U.S. adults. The following data display the percent of adults aged 18 years and over who had 5 or more drinks in 1 day at least once in ...
*July 8, 2013*

**venns diagrams**

20
*July 7, 2013*

**PHYSICS 2**

An electron in an x-ray machine is accelerated through a potential difference of 1x10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?
*June 30, 2013*

**Math**

Find the largest possible degree n≤1000 of a polynomial p(x) such that: p(i)=i for every integer i with 1≤i≤n p(−1)=1671 p(0) is an integer (not necessarily 0).
*June 18, 2013*

**Macroeconomics**

(Monetary Policy and Aggregate Supply) Assume that the economy is initially in long-run equilibrium. Using an AD–AS diagram, illustrate and explain the short-run and long-run impacts of an increase in the money supply.
*June 15, 2013*

**Calculus**

A car leaves an intersection traveling west. Its position 5 sec later is 22 ft from the intersection. At the same time, another car leaves the same intersection heading north so that its position 5 sec later is 27 ft from the intersection. If the speed of the cars at that ...
*June 13, 2013*

**Calculus**

The total worldwide box-office receipts for a long-running movie are approximated by the following function where T(x) is measured in millions of dollars and x is the number of years since the movie's release. T(x) = (120x^2)/(x^2 + 4) How fast are the total receipts ...
*June 13, 2013*

**Calculus**

Suppose f and g are functions that are differentiable at x = 1 and that f(1) = 2, f '(1) = -1, g(1) = -2, and g '(1) = 3. Find the value of h '(1). h(x) = (x2 + 11) g(x) h '(1) =
*June 13, 2013*

**Calculus**

The relationship between the amount of money x that Cannon Precision Instruments spends on advertising and the company's total sales S(x) is given by the following function where x is measured in thousands of dollars. S(x) = -0.002x3 + 0.9x2 + 4x + 500 (0 x 200) Find the ...
*June 13, 2013*

**Calculus**

The demand function for the Luminar desk lamp is given by the following function where x is the quantity demanded in thousands and p is the unit price in dollars. p = f(x) = -0.1x2 - 0.3x + 39 (a) Find f '(x). f '(x) = (b) What is the rate of change of the unit price ...
*June 13, 2013*

**Calculus**

Find the points on the graph of f where the tangent line is horizontal. f(x) = x3 - 15x2 (x, y) = ( , ) (smaller x-value) (x, y) = ( , ) (larger x-value)
*June 13, 2013*

**Calculus**

Find the slope and the equation of the tangent line to the graph of the function f at the specified point. f(x) = -8/5 x^2 + 7 x + 7;(-1, -8/5) slope tangent line y =
*June 13, 2013*

**Calculus**

Let f(x) = 4x5/4 + 10x3/2 + 9x. Find the following. (a) f '(0) = (b) f '(16) =
*June 13, 2013*

**spanish **

luke y renato / venir / a tu casa / para escuchar música nosotros / poder / almorzar / con lori y roberto thad y lorenzo / preferir / salir / con sus amigos berta y amanda / querer / almorzar / en el parque can someone help i am lost i have to put these words in to ...
*June 11, 2013*

**Accounting**

Samuels, Inc. reported net income for 2011 is $105,000. During 2011 the company had 5,000 shares of $100 par, 5% preferred stock and 20,000 of $5 par common stock outstanding. Samuels’ earnings per share for 2011 is A.$4.00 B.$5.25 C.$6.50 D.$5.00
*June 9, 2013*

**Accounting**

On April 1, 2011, Albert Company purchased $50,000 of Tetter Company’s 12% bonds at 100 plus accrued interest of $2,000. On June 30, 2011, Albert received its first semiannual interest. On February 1, 2011, Albert sold $40,000 of the bonds at 103 plus accrued interest. ...
*June 9, 2013*

**Accounting**

Available-for-sale securities are securities that management expects to sell in the future, but are not actively traded for profit. A.True B.False
*June 9, 2013*

**Accounting**

Ruben Company purchased $100,000 of Evans Company bonds at 100 plus $1,500 in accrued interest. The bond interest rate is 8% and interest is paid semi-annually. The journal entry to record the receipt of interest on the next interest payment date would be: A.Debit: Cash $4,...
*June 9, 2013*

**Accounting**

When long-term investments in bonds are sold before their maturity date, the seller deducts any accrued interest since the last interest payment date from the selling price. A.True B.False
*June 9, 2013*

**Accounting**

Jacks Corporation purchases $200,000 bonds plus accrued interest for 2 months of $2,000 from Kennedy Company on March 1. The bonds have an annual interest rate of 6% payable on June 30 and December 31. The entry to record the purchase of the bonds would include: A.Interest ...
*June 9, 2013*

**Accounting**

Which of the following is not a part of comprehensive income? Answer foreign currency items restructuring charges unrealized gains and losses pension liability adjustments
*June 9, 2013*

**physics**

I have another question for the problem below, so What is the speed of the car just before it lands safely on the other side? would it be the same 38.6 meters/sec A 10,000N car comes to a bridge during a storm and finds the bridge washed out. The 650-N driver must get to the ...
*June 4, 2013*

**physics**

I have another question for the problem below, so What is the speed of the car just before it lands safely on the other side? would it be the same 38.6 meters/sec A 10,000N car comes to a bridge during a storm and finds the bridge washed out. The 650-N driver must get to the ...
*June 4, 2013*

**physics**

I have another question for the problem below, so What is the speed of the car just before it lands safely on the other side? would it be the same 38.6 meters/sec A 10,000N car comes to a bridge during a storm and finds the bridge washed out. The 650-N driver must get to the ...
*June 4, 2013*

**UK Taxation**

OPPA is the controlling shareholder and managing director of GANGNAM Ltd, un unquoted trading company that provides support services to the oil industry OPPA disposed of the following assets during the tax year 2009-10 1. On 8 April 2009 OPPA sold five acres of land to GANGNAM...
*June 2, 2013*

**eDX**

8.8279928732e-20 you're welcome guys
*May 30, 2013*

**eDX**

If the diffusivity is observed to double when the temperature increases by 10⁰ C, what is the activation energy for diffusion?
*May 30, 2013*

**Chemistry**

I was able to find both the Mol Frac and m now. The only problem is w/w. m) (40.0gNaCl)*(1molNaCl/58.33gNaCl)=.684mol Nacl -200.0gH20*(1molH20/18.02gH20)=11.mol H20 -200g= .2L ** .684mol NaCl/.2LH20= m=3.42 Mol Frac) .864molNaCl/(.864molNaCl+11.02)= .580 w/w .684/11.02= 3.63
*May 24, 2013*

**Chemistry**

Dr.Bob, Could you please show the work for w/w and mol frac. I continue to get a completely bizarre number. The only one that I am getting correct is the molal part.
*May 24, 2013*

**Chemistry**

A solution contains 40.0 g of sodium chloride and 200.0 g of water. Calculate the NaCl concentration as a a) mass percentage, b) molality, c) mole fraction. I have trouble finding mole fraction. I believe I've got the other two, but I'm not 100% sure.
*May 24, 2013*

**Chemistry**

Calculate the osmotic pressure at 22 °C of a 0.25 M solution of a) dextrose, b) magnesium chloride.
*May 24, 2013*

**Math**

Is this correct? Mode 7, median 7, range 15
*May 23, 2013*

**Math**

What is the mode, median, range for: 2,2,4,4,7,7,7,11,12,17
*May 23, 2013*

**statistics**

100 explanation 600*1/6=100
*May 20, 2013*

**statistics**

You can't do nothing about stop them cheating , but you have fun leading them in the wrong direction? This makes you feel better than them? :))))...don't you feel it's something wrong?
*May 18, 2013*

**statistics**

there are 3 reasons for which you do not understand this easy statistic issue: -teacher did not explained you well enough( which I doubt) -you are not attentive(which is most likely) -you are not accurate or you jump directly on seeking answers,without a complete judgement of ...
*May 18, 2013*

**statistics**

D)The statistical standard deviation Sigma is the square root of the variance; the variance is described as the average difference from the mean. How far is each data point from the mean? 1-0=1 1-0=1 -1-0=-1 -1-0=-1 0-0=0 0-0=0 (1^2+1^2+(-1)^2+(-1)^2+0^2+0^2)/6=4/6=2/3 sqrt(2/...
*May 18, 2013*

**Calculus**

An object is traveling along the x axis so that its speed is given by v(t)=t^2-7t+10 m/s. (a) Find the times when the object is at rest. (b) Find the acceleration at both of these times. Interpret the acceleration in terms of the motion of the object, ie whether the object is ...
*May 15, 2013*

**Chemistry**

Is there a difference between SiO2(aq) and H4SiO4?
*May 15, 2013*

**math**

0.2(x+30)-0.03(x-40)=17.4
*May 14, 2013*

**precalculus**

solve equation for solutionn over interval [0,360): cot(è)+4csc(è)=5
*May 13, 2013*

**precalculus**

solve equation for solutionn over interval [0,360): cot(è)+4csc(è)=5
*May 13, 2013*

**English - Poetry**

Here is a copy of the poem: My children play with skulls for their classrooms are guarded by warlocks who scream at walls collapsing into paper toilets plump witches mouth ancient curses in an untaught tongue test children upon their meaning assign grades in a holocaust ...
*May 10, 2013*

**English - Poetry **

What does Audre Lorde's poem School Note mean? Most notably, what does the last stanza, "My children play with skulls/ and remember / for the embattled / there is no place / that cannot be / home / nor is."?
*May 10, 2013*

**Discrete Math**

Let f : R R→Z be the closed binary operation defined by f (a, b) _ _a + b_. (a) Is f commutative? (b) Is f associative? (c) Does f have an identity element?
*May 8, 2013*

**Math**

Is 72.98 = 72.980 my answer is true.. Is it correct?
*May 7, 2013*

**Chemistry**

Assuming equal concentrations, rank these aqueous solutions by their freezing point: low to high NH4Cl, Sn(ClO3)4, Na2SO4, and AlBr3.
*May 4, 2013*

**chemistry**

find the molar solubility of zinc carbonate if its ksp=1.5x10^-10. (at 298K)
*May 4, 2013*

**math**

If the length of a rectangle is 4 more than 3 times the width, and the perimeter is 32 meters, what are its dimensions? Please enter your answer as two numbers without the units, separated by a comma.
*May 1, 2013*

**statistics**

a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers
*April 29, 2013*

**Physics**

A ceiling fan starting from rest reaches an angular velocity of 30 rev/sec in 5 sec. What is the angular displacement of the fan during these 5 sec? Can you show me the steps need to figure this question out? Thanks!
*April 24, 2013*

**Physics**

A drawbridge with a weight of 5000 N is supported by a hinge and rope and is in static equilibrium. The length of the drawbridge is 5 m and the rope is attached to the draw bridge a distance of 4 m from the hinge. What is the tension force rope provides? Can you show me steps ...
*April 24, 2013*

**math**

I'm sorry, but I don't think this is possible since 999 + 999 = 1098 (even the sum of the largest possible three-digit numbers do not give us a large enough total. 104 x 162 = 16848 (not sure if you wanted a "product?" I found this by trial and error with a ...
*April 22, 2013*

**math**

there are 9 candidates running for 3 seats....how many different election results are possible
*April 22, 2013*

**Calculus**

Find the exact area below the curve y=x^3(4-x)and above the x-axis
*April 21, 2013*

**Chemistry**

Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 10.4-g sample of CaCl2 is dissolved in 102 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and ...
*April 18, 2013*

**Java programming**

can u give me some example of withdrawal money program using array to store ten information of user. including the attributes: (i) Name of the depositor (ii) Account number (iii) Type of account (iv) Balance amount And the methods: (i) Deposit (ii) Withdraw (iii) Display the ...
*April 18, 2013*

**math**

Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March and averaged 125 ...
*April 18, 2013*

**math**

not sure confused
*April 13, 2013*

**math**

Suppose A is the set of students registered at the University of Calgary, and C is the set of courses currently being offered at the University of Calgary. Under what conditions is each of the following a function? a) {(a, c) | a’s first class each week is in c} b) {(a, c...
*April 13, 2013*

**English**

Having problems with a introductory sentence. Its a essay on dying and living. I wrote a question to start my intro. Sentence. Or I wrote The professor died in 1974 of Cancer. Someone please let me know if I started out right. Please
*April 12, 2013*

**social science statistics**

a professor was curious to whether the students in a very large class she was teaching who turned in their first scored differently from the overall mean on the test.The overall mean score on the test was 75 with a standard deviation of 10;the score were approximately normally...
*April 9, 2013*

**english**

the couple ordered ___ for hors d'oeuvres at the wedding a)pumpkin pie b)cake c)soup d)stuffed mushrooms?
*April 4, 2013*

**algebra**

If a pendulum is 30 feet long what is the period of the pendulum in seconds with function l = 0.81t^2
*April 4, 2013*

**MATH please help**

An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
*April 3, 2013*

**Science**

grapes biotic
*April 2, 2013*

**Math**

1. Number sense. Could the frozen yogurt survey help restaurants choose flavors of frozen yogurt? Explain. 2. Give an example of a topic for a survey question where the results for the answers could be similar.
*April 1, 2013*

**physics**

Two racquetballs, each having a mass of 200 g, are placed in a glass jar as shown in in the figure below. Their centers lie on a straight line that makes a 45° angle with the horizontal.
*March 31, 2013*

**calculus**

A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.5 centimeters per second. What ...
*March 31, 2013*

**Math**

What is greater -19 or -17?
*March 25, 2013*

**algebra**

In 2000, the average family net worth was $360,000 and there were about 7.7x10^7 families. Calculate the total family net worth in 2000.
*March 20, 2013*

**Math**

Which shows 18.64 rounded to the nearest tenth? My answer is 18.6 is this correct
*March 18, 2013*

**Chem**

What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
*March 18, 2013*

**Chem**

What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
*March 18, 2013*

**Chem**

What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
*March 17, 2013*

**maths**

When conducting an inferential statistical analysis, and applying a conventional “critical p- value” of .05, the odds of making a Type I Error and “rejecting a true Null Hypothesis” is…?
*March 17, 2013*

**AP Chemistry**

Ohhhh, that makes sense! Thanks!
*March 16, 2013*

**AP Chemistry**

A biochemist prepares a lactic acid-lactate buffer by mixing 225 mL of 0.85M lactic acid with a Ka=1.38*10^-4 with 435mL of 0.68M sodium lactate. What is the buffer pH? I know I have to use the equilibrium constant expression, but I'm pretty lost from there. Can someone ...
*March 16, 2013*

**math**

sonya spent three eighth of her money and then had $15 left. how much money did she originally have
*March 16, 2013*

**Math**

0.9 x 2 or 2 + 0.9
*March 14, 2013*

**Math**

Which is greater 0.9 x 2 or 2 + 9? My answer is 0.9 + 2 is greater because it equals 2.9 and 0.9 x 2 = 1.8.. Is this correct?
*March 14, 2013*

**Chemistry**

thnk u so much
*March 14, 2013*

**cHEM**

i got 114.5 is this right?
*March 14, 2013*

**cHEM**

It is found that 1.431 g of element X contains 7.509 × 1021 atoms. The atomic mass of X is?
*March 14, 2013*

**Math/230**

A 350 word response how to compute probabilities using z score
*March 14, 2013*

**Chemistry **

What is the change in enthalpy when 17.0 g of liquid mercury is heated by 31°C?
*March 12, 2013*

**Physics**

A force is applied to a door at an angle of 56.8° and 0.34 m from the hinge. a) What force produces a torque with a magnitude of 2.18 N·m? b) How large is the maximum torque this force can exert?
*March 12, 2013*

**english**

what's an example of an appostion in the book Miracle Worker?
*March 10, 2013*

**algebra**

an investment of $50,000 was made by a busines club. the investment was split into three parts and lasted for one year.the first part of the investment earned 8% interest, the second 6%, and the third 9%. total interest from the investments was $3960. the interest from the ...
*March 6, 2013*

**Physics**

A car is travelling along a highway with a speed of 25 m/s when the driver sees an obstruction 1.80*10^2 m directly ahead. It takes the driver 0.80s to react and begin braking. a) How far does the car travel before it begins to slow down? b) How long will it take the car to ...
*March 4, 2013*

**Physics**

In a target shooting game, wooden blocks are thrown into the air and shot in flight. A block of 0.8kg has a speed of 10 m/s at the top of its trajectory when it is hit by a bullet from below at an angel 60° from horizontal. The mass of the bullet is 5.0 g and its speed is ...
*March 4, 2013*

**Physics**

In a target shooting game, wooden blocks are thrown into the air and shot in flight. A block of 0.8kg has a speed of 10 m/s at the top of its trajectory when it is hit by a bullet from below at an angel 60° from horizontal. The mass of the bullet is 5.0 g and its speed is ...
*March 4, 2013*