Friday

October 21, 2016
Total # Posts: 1,354

**physics**

The hot reservoir for a Carnot engine has a temperature of 926 K, while the cold reservoir has a temperature of 441 K. The heat input for this engine is 3730 J. The 441-K reservoir also serves as the hot reservoir for a second Carnot engine. This second engine uses the ...

*December 1, 2012*

**physics**

The wattage of a commercial ice maker is 226 W and is the rate at which it does work. The ice maker operates just like a refrigerator and has a coefficient of performance of 3.90. The water going into the unit has a temperature of 15.0°C, and the ice maker produces ice ...

*December 1, 2012*

**physics**

After 6.00 kg of water at 80.4 oC is mixed in a perfect thermos with 3.00 kg of ice at 0.0 oC, the mixture is allowed to reach equilibrium. When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to be...

*December 1, 2012*

**Physics HELP!!**

A loudspeaker is placed between two observers who are 113m apart, along the line connecting them. If one observer records a sound level of 51.8dB and the other records a sound level of 75.8dB, how far is the speaker from each observer? Enter the longest distance first.

*November 30, 2012*

**Physics**

A 71.4cm long tube has a 71.4cm long insert that can be pulled in and out. A vibrating tuning fork is held next to the tube. As the insert is slowly pulled out, the sound from the tuning fork creates standing waves in the tube when the total length L is 77.5cm, 126.0cm, and ...

*November 30, 2012*

**Math**

A microscopic worm is eating its way around the inside of a spherical apple of a radius of 6 cm. What is the probability that the worm is within 1 cm of the surface of the apple? ( hint: v=4/3pier^3 where r is the radius)

*November 25, 2012*

**Math**

two dice a. find the odds in favor of the following events: 1 getting a sum of 7 2 getting a sum greater than 3 3 getting a sum that is an even number b. find the odds against each of the events in part a

*November 24, 2012*

**Math**

a spinner is spun whose central angles are all 45 degrees. #'s 1-8 on wheel. What is the probability that it lands on 5 if you know the following? a. it lands on an odd # b. it lands on a # greater than 3 c. it does not land on 7 or 8 d. it lands on a factor of 10

*November 24, 2012*

**Math**

2 dice are thrown. a. find the odds in favor of the following events: 1. getting a sum of 7 2. getting a sum greater than 3 3. getting a sum that is an even number b. find the odds against each of the events in part a

*November 24, 2012*

**Math**

Publishers records state: 20% of books published break even. 30% lose $1000. 25% lose $10,000. 25% earn 20,000. When a book is published, what is the expected income for the book?

*November 24, 2012*

**Math**

Box contains 4 white balls and 8 black balls. Pick a ball with your left hand, and don't look, pick a ball with your right hand, and don't look at it either. a. what is the probability the ball in your left hand is white? b. Next, you look at the ball in your right ...

*November 24, 2012*

**Math**

I figured it out never mind. a. is 1/3 because 4 of 12 balls are white, you pick with your left hand first, so all balls are still there. b. 1 ball is gone, so there are 4 white 7 black, therefore 11 balls left. 4/11 is the probability that the ball in your left is white.

*November 24, 2012*

**Math**

Box contains 4 white balls and 8 black balls. Pick a ball with your left hand, and don't look, pick a ball with your right hand, and don't look at it either. a. what is the probability the ball in your left hand is white? b. Next, you look at the ball in your right ...

*November 24, 2012*

**Math**

You come home after dark, and porch light is out. You cannot tell which key opens the door.. you randomly try the 5 keys on your ring, 2 keys open your door. Draw a tree diagram for the experiment & Find the probability of opening the door on the first or second try.

*November 24, 2012*

**Can someone help with this?**

Guess you don't know then why comment

*November 19, 2012*

**Can someone help with this?**

Sorry, yes

*November 19, 2012*

**Can someone help with this?**

A psychologist is performing an experiment involving a controlled group and an experimental group. With the experimental group, the psychologist is giving a placebo and labeling it as caffeine pill. The control group receives a caffeine pill, which is noted as such. Which of ...

*November 19, 2012*

**Psychology**

A psychologist is performing an experiment involving a controlled group and an experimental group. With the experimental group, the psychologist is giving a placebo and labeling it as caffeine pill. The control group receives a caffeine pill, which is noted as such. Which of ...

*November 18, 2012*

**Math**

First period: 85, 83, 74, 70, 88,95,89,72,90,83,77,91,98,89,82,84 Second period: 95,89,82,81,72,69,100,97,75,91,82,79,96,81,80,95,89,97,83,71 Mark is a student in the first period class. His score on the exam was 95%. Zoe is a student in the second period class, she also ...

*November 14, 2012*

**Math**

Dorian's score of 558 on the writing portion of the 2009 SAT exam placed him in the 72nd percentile. If the mean on this exam was 493, what was the standard deviation?

*November 13, 2012*

**Accounting**

In 20X0, ABC company purchased machine for $300,000 that had a useful life of 5 years, with a salvage value of $50,000 at the end its life. Depreciation was calculated over 2 years on straight-line basis. In 20X2, it determined that the total life should be 10 years with the ...

*November 9, 2012*

**chemistry... HELPP**

What is the cell potential for the reaction Mg(s) + Fe^2+(aq) -----> Mg^2+(aq) + Fe (s) at 63 degrees celsius when [Fe^2+]= 3.30 M and [Mg^2+]= 0.110 M

*November 3, 2012*

**chemistry**

Balance the following equation: K2CrO4+Na2SO3+HCl--->KCl + Na2SO4+CrCl3+H2O Enter the coefficients for each compound, separated by commas, in the order in which they appear in the equation (e.g., 1,2,3,4,5,6,7).

*November 2, 2012*

**physics ..PLEASE HELP ASSIGN DUE SOON :(**

Forces of 11.1N north, 19.9N east, and 14.0N south are simultaneously applied to a 3.62kg mass as it rests on an air table. What is the magnitude of its acceleration? I already did this part and i got 5.56 m/s^2 BUT PLEASE HELP ME WITH part b!! b)What is the direction of the ...

*October 31, 2012*

**physics ..PLEASE HELP ASSIGN DUE SOON :(**

an object on an inclined ramp of mass 1.39kg. The angle of the inclined surface is 29deg with the horizontal. The object on the ramp is connected to a second object of mass 2.17kg on a horizontal surface below an overhang that is formed by the inclined surface. Further, an ...

*October 31, 2012*

**Physics HELP!!**

A 7.37kg fish is held by a taut string. If the fish is accelerated upward at a rate of 3.62m/s^2, what would be the tension in the string?

*October 31, 2012*

**Physics HELP!!**

two horizontal forces F1 and F2, acting on an object of mass 1.11kg. The magnitude of F1 is 27.56N. The object moves strictly along the horizontal x-axis, which we choose as positive to the right. Find the magnitude of F2 if the object has a horizontal acceleration of 8.4m/s^2...

*October 31, 2012*

**Physics HELP!! pleasee**

an object on an inclined ramp of mass 1.39kg. The angle of the inclined surface is 29deg with the horizontal. The object on the ramp is connected to a second object of mass 2.17kg on a horizontal surface below an overhang that is formed by the inclined surface. Further, an ...

*October 28, 2012*

**Physics**

A 7.37kg fish is held by a taut string. If the fish is accelerated upward at a rate of 3.62m/s^2, what would be the tension in the string?

*October 28, 2012*

**Physics**

Determine the stopping distance for a skier moving down a slope with friction with an initial speed of 20.6m/s. Assume μk=0.178 and θ=5.27.

*October 28, 2012*

**Physics HELP!!**

Two masses of 3.40kg and 4.55kg are connected by a light string that passes over a frictionless pulley. Determine the tension in the string. b). Calculate the acceleration of m

*October 28, 2012*

**Geometry**

Below is a worksheet I have to do for my geometry class. I am not sure about the answers I have given and I have no clue about the ones not answered. Any help will be much appreciated and thank you in advance. A. Determine the number of triangulations for a hexagon. 5 B. How ...

*October 24, 2012*

**Financial Management**

As the financial analyst for a corporation, you are evaluating various types of bonds. The firm is gathering research about bonds currently issued. Understanding how to properly value a vanilla bond (a plain bond) is essential for finance. 1) What makes each of the different ...

*October 23, 2012*

**Accounting**

Financial Accounting 1. The following information was made available from the income statement and balance sheet of Meranda Company: ITEM 12/31/2010 12/31/2009 Accounts Receivable $ 42,000 $ 45,100 Accounts Payable 27,900 24,500 Merchandise Inventory 68,000 63,000 Sales (2010...

*October 19, 2012*

**Algebra**

I cannot solve the problem please help me. I'm suppose to set the equations up to solve for t. x = y + rt + at^2/2 Even when I plug in the values I don't get the answer. x = 16.4 y= 0 r= 0*cos(45)a=0 t is suppose to equal 2.32 if I set the problem up correctly.

*October 11, 2012*

**Landforms-history**

A plateau

*October 4, 2012*

**Health Care Management**

During the health care debate in Congress Republicans were accused of wanting to "Kill Granny". Is David Blumenthal implying something along the same lines as Congressional Republicans are purported to support? How can this issue be addressed?

*October 4, 2012*

**Alegbra **

I have to use this equation to get the answer (t)=time. V=S+a*t I divided t by both sides, but get a little confuse do I divide V by both sides as while is the answer: t = V/s+a/S??

*October 4, 2012*

**Geometry**

Complete Problem #28 in Section 1.5 Exercises (Chapter 1) of Essentials of Geometry for College Students. Use the table below to show your work and solve the problem. You may add or delete rows as necessary. Statements Reasons PQ=RS Given PS=PQ+RS Segment Addition Postulate PR...

*October 4, 2012*

**Physics **

A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 6.50m/s. During the second part, she rides for 36 minutes at an average speed of 4.30m/s...

*September 29, 2012*

**Chemistry**

How can you calculate activation energy in (kj/mol)? When all that is given is inverse temperature, and natural log reaction constant? Inverse: 1/278 for Kelvin temp, 1/308 Natural Log Reaction Rate Constant: 4.3 5.5

*September 25, 2012*

**Chemistry**

How do you do the inverse of absolute temperature? My kelvin temperatures are: 298 308 318 328 338 348 358 368 378 Taking the natural log of both sides of both sides of the equation gives ln(k) = ln(A) – E/RT. Thus, a graph of the natural log of the reaction rate constant...

*September 25, 2012*

**Calculus**

I'm having problems with this one. Can't get the right answer. Differentiate the following using the chain rule. f(x) = squareroot(x^2+1)/(3x+1) I know that I can take the whole thing and put it to the (1/2) and differentiate that then use the quotient rule to ...

*September 22, 2012*

**Physics/Chemistry**

I am not producing the correct answer which is 2.06 psia. Question: The pressure gauge on the steam condenser for a turbine indicates 26.2 in. Hg of vacuum. The barometer reading is 30.4 in. Hg. What is the absolute pressure in the condenser in psia? I know that 1 in. Hg = 0....

*September 18, 2012*

**4th grade math**

I have 5 ones and 19 hundredths. What number am I?

*September 17, 2012*

**Chemistry/Math**

I'm not sure how to approach this problem. A manometer uses kerosene, specific gravity 0.82 as the fluid. A reading of 5 inches on the manometer is equivalent to how many millimeters of mercury?

*September 17, 2012*

**algebra**

im having trouble with subsets.. name the subsets to which the numbers belong 3/4 0 -6 square root of 7 5

*September 17, 2012*

**Chemisty/Physic**

How can I find the pipe diameter when given the velocity = 1 m/s and the volumetric flow rate = 6000 m^3/day and flow area = 6000 m^2/s So that everything cancels leaving me with meters so I can write my answer in cm.

*September 13, 2012*

**biology**

what is the mass in grams of 1.03 kg 1105g and 1075000mg

*September 12, 2012*

**Excel & Math **

I'm not sure what two excel functions to use that will give the correct answer and how to copy the information to each cell and the values stay the same. 2. A home loan is to be repaid by a series of equal monthly payments over many years. Prepare a worksheet to calculate ...

*September 12, 2012*

**Math/Excel**

I'm not sure what two excel functions to use that will give the correct answer and how to copy the information to each cell and the values stay the same. 2. A home loan is to be repaid by a series of equal monthly payments over many years. Prepare a worksheet to calculate ...

*September 7, 2012*

**Chemistry**

In part b when it says compressing the piston 2 cm from the bottom of the cylinder. This value is irrelevant?

*September 6, 2012*

**Chemistry**

I need help with part b here's all information. (a) Chlorine gas is added to a glass cylinder of 2.5 cm in radius, fitted with a movable piston. Gas is added until the piston is lifted 5 cm off the bottom of the glass. The pressure on the gas is 1 atm, and the gas and ...

*September 6, 2012*

**History**

In general, The unites states.

*September 4, 2012*

**History**

Humans modify the environment in places they live. For example, people convert fields and forests into towns and irrigate arid land to support farming. Give 2 examples of ways people have modified the environment where we live.

*September 4, 2012*

**Chemistry/Physics**

The equation needed to solve for volumetric flow rate = flow area * velocity How do you calculate flow area when all is given is velocity 1 m/s and 6000 m^3.

*September 4, 2012*

**Chemistry/Math**

Where does the 5 come from?

*September 4, 2012*

**Chemistry/Math**

(6000)(1/86400)*(1/3)sqrt(5/2Pi)

*September 4, 2012*

**Chemistry/Math**

When I calculate what you did, I don't get the same answer.

*September 4, 2012*

**Chemistry/Math**

I went to my teacher numerous times. I'm still not using the right formulas or equations. Please help. A commonly used rule of thumb is that average velocity in a pipe should be about 1 m/s or less for "thin" (viscosity about water). If a pipe needs to deliver 6,...

*September 4, 2012*

**Science **

I have no idea what to do, and the teacher wants the volumetric flow rate (in cm). A commonly used rule of thumb is that average velocity in a pipe should be about 1 m/s or less for "thin"(viscosity about water). If a pipe needs to deliver 6,000 m^3 of water a day, ...

*August 31, 2012*

**algebra**

one angle of a parrallelogram is 23 degrees less than six times the measure of the angle next to it.the sum of the measures of the angles is 180 degrees. find the measure of the adjacent angles of the parrallelogram.

*August 27, 2012*

**MATH**

ROBERT NUMBER IS BETWEEN 20 AND 32. THE SUM DIGITS IS 10. WHAT IS ROBERT NUMBER? I KNOW ANSWER IS 28 BUT NEED TO KNOW STEP BY STEP HOW TO GET TO 28?

*August 23, 2012*

**VOCABULARY**

In order to change the meaning of the word teach from "to give instruction" to "to give instruction with" you would add the prefix .

*August 17, 2012*

**Chemistry**

100 g

*July 30, 2012*

**Human Resources**

What do you think are three most prominent characteristics of a human service professional?

*June 29, 2012*

**math**

x2 -x - 6? the 2 is exponent

*June 24, 2012*

**math**

P=2L+2W+L Please check my answer L=P-2w/2

*June 13, 2012*

**math**

2x+3y=9

*June 13, 2012*

**math**

The radius of a circle in terms of its circumference

*June 13, 2012*

**Math (2)**

A person just fitted for contact lenses is told to wear them only 2 hours the first day and to increase the amount of time by 20 minutes each day. After how many days will the person be able to wear the contacts for 14 hours?

*June 10, 2012*

**Math**

A person just fitted for contact lenses is told to wear them only 2 hours the first day and to increase the amount of time by 20 minutes each day. After how many days will the person be able to wear the contacts for 14 hours? *Solve using a arithmetic series

*June 10, 2012*

**math**

Thank you for the clarification on A and for B the way the question is worded I think I'm going to go with the .96... THANKS GUYS!

*June 8, 2012*

**math**

the question is asking for the eighth time it hits the ground so wouldn't that include the other part of the .96, because what you have here is technically hitting the ground 7 times and the ball is in mid-air.... and for b) how did you set the problem up? Thank you!

*June 8, 2012*

**math**

A superball is dropped from a height of 2 m and bounces 90% of its original height on each bounce. (a) When it hits the ground for the eighth time, how far has it traveled? (b) How high off the floor is the ball on the eighth bounce?

*June 8, 2012*

**Intermediate Algebra**

y varies directly as the cube of x and inversely as the square of z. If y is 30 when x is 2 and z is 4: b) Find the equation that models this data. c) Find the value of y when x is 3 and z is 2.

*April 28, 2012*

**Calculus**

the edge of a cube was found to be 18 inches with a possible measurement error of 0.1 find the max possible error in calculating the surface area of the cube

*April 18, 2012*

**college chemistry**

0.171 g Li

*April 15, 2012*

**college chemistry**

75.0 g NaHCO3

*April 15, 2012*

**Algebra**

Reiny...yes, thank you. I appreciate the help so much. I did have the some work-up for X=smallest angle. Thanks for starting me out for the next 2 angles.

*April 14, 2012*

**Algebra**

The following problem must be solved 3 different ways in which X=smallest angle for problem 1. Problem 2 would be X=medium sized angle. Problem 3 would start with X=largest angle. I was able to figure out X=smallest angle, but I am stumped on the other 2 as to how to set it up...

*April 14, 2012*

**math**

13.2

*March 27, 2012*

**Accounting1**

Consider the following scenarios: (Please respond to each scenario) When we talk about "bad checks," are those always checks our customers have written to us? Explain. Would the company also write any bad checks and what are the repercussions for the same? Give ...

*March 27, 2012*

**math**

30 3/4 x 60 3/8 what is the area of the new building?

*March 23, 2012*

**General math**

30 3/4 x 60 3/8

*March 20, 2012*

**Calculus**

Find the following limits algebraically or explain why they don’t exist. lim x->0 sin5x/2x lim x->0 1-cosx/x lim x->7 |x-7|/x-7 lim x->7 (/x+2)-3/x-7 lim h->0 (2+h)^3-8/h lim t->0 1/t - 1/t^2+t

*March 15, 2012*

**Chemistry**

1.67014614E-27 kg

*March 4, 2012*

**Chemistry**

1.67014614E-27

*March 4, 2012*

**Algebra**

The electric current I in a circuit varies directly as the voltage V. When 21V are applied, the current is 4A. What is the current when 18 volts are applied

*March 2, 2012*

**Calculus**

what is the curve given by the equation x^3=3xy^2+y^3=1 what is dy/dx?

*February 29, 2012*

**yargo**

a garden is shaped like an x. there is a right angle at each corner of the garden and each side of the garden measures 40 feet long. what is the area of this garden?

*February 27, 2012*

**Calculus**

find f'(x) if f(x)= (cosx)^sinx

*February 23, 2012*

**Calculus**

find y' if sin^-1(xy)=cosy

*February 16, 2012*

**Simple Interest & Maturity Value**

On September 7, Jennifer Rick went to Park Bank to borrow $3,200 at 11 2/3% interest. Jennifer plans to repay the loan on January 5. Assume the loan is on ordinary interest (ordinary interest uses 360 days a year). Solving for: 1. interest Jennifer will owe on January 5 2. the...

*February 16, 2012*

**math/calc**

find y'' if x^4+y^4=16

*February 15, 2012*

**math/Calc**

g(x)={1+cos(pi/2-x/1) 0 for-2 <or= x <or=2 for x<2 or x>2 is g(x) continuous at x=2 is it differentiable at x=2? ex[lain in detail I'm very confused as to how to solve this problem

*February 9, 2012*

**math 205**

the product of 3 and y is less than or equal to the sum of y and 6

*February 2, 2012*

**math/calculus**

Find f’’(x) if f(x)=(6^x^2+3)

*January 19, 2012*

**math/calculus**

Find f’’(x) if f(x)=(6^x^2+3)

*January 19, 2012*

**math/calculus**

Find f’’(x) if f(x)=(6^x^2+3)

*January 19, 2012*