Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 311

**matter and energy**

so is the answer 316 joules?
*October 1, 2014*

**matter and energy**

thanks dr.bob
*October 1, 2014*

** matter and energy**

how much heat must be added to 5.0 g of solid lead at 30 degrees celcius to convert it to liquid lead at the melting point?
*October 1, 2014*

**PhysicsI**

A puddle holds 150 g of water. If 0.50 g of water evaporates from the surface, what is the approximate temperature change of the remaining water? (Lv = 540 cal/g)
*July 24, 2014*

**PhysicsI**

A windowpane is half a centimeter thick and has an area of 1.0 m2. The temperature difference between the inside and outside surfaces of the pane is 15° C. What is the rate of heat flow through this window? (Thermal conductivity for glass is 0.84 J/s×m×°C.)
*July 24, 2014*

**math**

If 1/8" = 30' how many fractions of an inch is 24'
*July 3, 2014*

**jacksonville**

2NBr3+63NaOH--->N2+3NaBr+3hobr
*April 10, 2014*

**PHYSICS(HELP)**

I obtained: a) 0.86 atm b) 5503.4 Pa c) 7% But all are wrong and I don't know why!!! And I have only one submission more. Please help!!!
*January 12, 2014*

**Physics Classical Mechanics Help ASAP**

Thanks a lot!!!
*January 10, 2014*

**Physics Classical Mechanics Help ASAP**

Greco, thanks a lot!! I obtained this results for the problem above. a) 0.26 b) 54715.5 c) I am not sure
*January 10, 2014*

**Physics Classical Mechanics Help ASAP**

If you have a) you only need to rest from b) ..... but I am continue suffering with a) did you replace all the values without converting to other unid system???
*January 10, 2014*

**Physics Classical Mechanics Help ASAP**

Thanks a lot abc, and what about a) and b) I did it again and now I obtained a)0.83 atm b)3061.5 Pa But it's my last chance and I am not sure......
*January 10, 2014*

**Physics Classical Mechanics Help ASAP**

I obtained: a) 0.86 atm b) 5503.4 Pa c) 7% But all are wrong and I don't know why!!! And I have only one submission more. Please help!!!
*January 10, 2014*

**Physics Classical Mechanics Help ASAP**

Please help with this exercise, is the only one that I need......please.
*January 10, 2014*

**calculus hw**

so it should be 5/12+8/3=37/12?
*December 15, 2013*

**calculus hw**

What is the area bounded by y=x^2 and y=x^3-2x?
*December 15, 2013*

**science**

What can be inferred after performing the experiments in the Atomic Theory lab?
*November 14, 2013*

**Chemistry**

What molecular formula can you deduce from a mass spectrometry of 156 m/z. And how do you get that formula? Steps on how to get the formula is much appreciated! Thanks!
*November 12, 2013*

**Mathjc**

b(A+a)
*November 2, 2013*

**Statistics**

Which is true about a 99% confidence interval for a population proportion based on a given sample? I. We are 99% confident that the population proportion is in our interval. II. There is a 99% chance that our interval contains the sample proportion. III. The interval is wider ...
*October 28, 2013*

**Math**

Thanks so much #yolo
*October 27, 2013*

**Math**

How did you do it? :)
*October 27, 2013*

**Math**

How do I convert this decimal into a fraction? 3.083 (The last 3 is repeating by itself)
*October 27, 2013*

**Chemistry**

Thanks, but for the first one, I thought it'd be no reaction since they are both metals. Is it possible for Ca and Al to react with each other?
*October 21, 2013*

**Chemistry**

What kind of reaction is this (redox, precipitation, acid-base, or complex ion formation reaction)? 1. 3 Ca(s) + 2 Al^3+(aq) -> 3 Ca^2+(aq) + 2 Al(s) 2. LiHCO3(s) + heat -> Li2CO3(s) + CO2(g) + H2O(g) Complete the reaction: Ni(s) + 2 Na^+(aq) -> ?
*October 21, 2013*

**quantum physics**

all are struck with 8d you need 3a?
*October 18, 2013*

**Chemistry**

Need help with coming up with a extraction flow scheme for separating the compounds in this mixture: aniline, p-anisic acid, octanol, and NaCl Thanks!
*September 17, 2013*

**MATH 117**

What is the greatest common factor (HINT: It may help for you to show an example of how to find a greatest common factor)? How do you know when you have found the greatest one?
*July 16, 2013*

**physics**

An automatic dryer spins wet clothes at an angular speed of 4.4 rad/s. Starting from rest, the dryer reaches its operating speed with an average angular acceleration of 4.2 rad/s2. How long does it take the dryer to come up to speed?
*July 16, 2013*

**math**

the trip took 2 hours longer to cover the 160 miles than it took to come back. if the total time of the round trip was 6 hours, what was the rate going and what was the rate coming back?
*July 13, 2013*

**Finance**

A firm with 50% debt to equity ratio has a cost of equity capital of 15%, a cost of debt of 9% and a tax rate of 33%. The firm is considering a project costing 5,000 that will generate an annual cash flow of 1,000 for the next 8 years. What is the projects NPV?
*June 30, 2013*

**Chemistry**

what is the molarity of 28.9 g of cacl2 dissolved in water to make 0.78 l of solution
*May 25, 2013*

**phy**

A popular brand of pressure washer claims to deliver 330 litres per hour of water at a pressure of 80 bar, drawing 1400 W of electrical power in the process. Pressure washers of this type consist of an electric motor that drives a small compressor to pressurize water fed into ...
*May 11, 2013*

**Physics**

A van drive 17.5km north. Then it turns west and drives 9.1km. The van then drives 14.5km south. The entire trip takes 40 minutes. What is the average velocity of the truck? I know avg velocity is displacement/time elasped, but I can not figure out what the displacement it.......
*April 24, 2013*

**MATHS**

$169.50
*March 17, 2013*

**MATHS**

PAT FAMILY HAS 7 MEMBERS. EACH MEMBER SPENDS $10.00 TO ENTER A CINEMA.THEY MET 3 FRIENDS AND BOUGHT LUNCH FOR EVERYONE AT 9.95 EACH.CALCULATE THEIR TOTAL BILL.
*March 17, 2013*

**MATHS**

thanks anyway
*March 17, 2013*

**MATHS**

ms.sue can you practice me in maths for s.e.a like give me sites to do test then you will correct when i post the answers
*March 17, 2013*

**Reading**

Is these answers correct? devoid intimidate jeopardize sneer implore introvert sibling vivacious infuriate smug 1-2. The people I love best can __ me the most. No one can make me as angry as my parents and __s can. 3-4. Please don't __ me to help you with your term paper. ...
*March 12, 2013*

**math**

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing?
*March 6, 2013*

**math**

Malcom designed the roof plan of a house and implement shed. The dimensions of the house's roof are 25 ft wide by 40 long. The length of the shed's roof is 140 feet. If the two shapes are similar, what is the width of the shed's roof?
*March 6, 2013*

**Reading**

thanks
*February 27, 2013*

**Reading**

Is these answers correct? condone, pathetic, feign, precedent, comtemplate gape furtive feasible, fiscal, punitive 1-2. "Would it be__ for us to buy a new copy machine?" Hal asked at the office budget meeting. The boss replied, "Unfortunately, our __situation is...
*February 27, 2013*

**Reading**

thank you
*February 27, 2013*

**Reading**

Is these answers correct? devoid infuriate jeopardize smug implore intimidate sibling sneer introvert vivacious 1-2. The people I love best can __me the most. No one can make me as angry as my parents and__s can. I guess close relationships are conducive to strong feelings, ...
*February 27, 2013*

**Physics**

A proton and an electron enter perpendicular to the direction of the magnetic field. The speed of the proton is twice the speed of the electron. What is the ratio of the force experienced by the proton to the electron?
*February 3, 2013*

**Physics**

A proton and an electron enter perpendicular to the direction of the magnetic field. The speed of the proton is twice the speed of the electron. What is the ratio of the force experienced by the proton to the electron? Thanks for helping me out
*February 2, 2013*

**Physics**

A circular loop with 30 turns and area of 0.25 m2 rotates at 100 rad/s. The axis of rotation of the loop is perpendicular to the direction of the magnetic field of 0.04 Tesla. What is the maximum emf induced in the loop?
*February 2, 2013*

**Physics**

A proton experiences a force of 4 Newton when it enters perpendicular to the direction of the magnetic field with a speed 100 m/s. What is the force experienced by the proton if it enters parallel to the direction of the magnetic field with a speed of 200 m/s?
*February 2, 2013*

**Physics**

A conductor of length 2m carrying a 1.5A current experiences a force of 2.2 N. What is the magnitude of the magnetic field that acts perpendicular to the flow of current in the conductor?
*February 2, 2013*

**algebra**

approximately how far can bobby drivein 2,3,4,and 5 hours
*January 21, 2013*

**chemistry**

At elevated temperatures, sodium chlorate decomposes to produce sodium chloride and oxygen gas. A 0.8915-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied 57.2 mL at a temperature of 22°C ...
*November 20, 2012*

**Statistics**

The number of arrivals per period is distributed according to the poisson with the expected value of 0.75 unit per period. the cost of waiting per unit per period is $3.20. The facility cost for serving one unit per period is $5.15. What expected service rate should be ...
*November 17, 2012*

**Chemistry**

A solution is 0.10M Pb(NO3)2 and 0.10M AgNO3. If solid NaCl is added to the solution what is [Ag+] when PbCl2 begins to precipitate? (Ksp PbCl2 = 1.7 x 10^-5; AgCl = 1.8 x 10^-10) The answers is 1.4 x 10^-8 How do I find the answer
*October 14, 2012*

**Chemistry**

Molarity of NaOH solution = 0.06115 Volume of NaOH used = 15.50 mL Volume of unknown Sample = 10.00 mL Find the Moles of NaOH used? Find the molarity of H3PO4? Thanks!
*October 10, 2012*

**lit**

in "A Pair of Silk Stockings" the silk stockings are a symbol of what?
*October 3, 2012*

**Math**

find the total number of square units the patio will cover if the width is 4,5,6,or 7 units
*September 17, 2012*

**Chemistry**

For solution 1, 4.00mL of 0.0200 M Cr(NO)3 was added to 20.00ml of 0.0200 M Na2H2EDTA, then the a time and absorbance were taken every 5 mins. If at 5:00 min the absorbance was 0.039 how do I find [Cr3+]0, [CrEDTA-]t, and [Cr3+]t. The absorbance at 0:00 mins was 0.039 if it is...
*September 17, 2012*

**biology**

One in every 685 children born in the chicoutimi area of quebec province has tyrosinemia. It is cause by having two copies of the receissive allele. Under the assumptions of Hardy-Weinberg equilibrium, calculate the value of q required to produce this proportion of afflicted ...
*September 11, 2012*

**lang arts**

i dontknow help
*September 5, 2012*

**math**

Mr burr the head custodian is working on putting new numbers on 42 of the 81 classroom doors. He found two numbers for the 23rd door he was working on in the 6th grade hallway whose sum is 35 and their product is 306. What are the two numbers?
*September 4, 2012*

**Math**

Find the volume generated when the area bounded by the curve y^2 = 16x, from x = 0 to x = 4 is rotated around the x-axis.
*August 21, 2012*

**Math**

ok thanks alot
*August 21, 2012*

**Calculus**

Find the area bounded by y= -0.5x+6, y= !/4 x and the y-axis. Sketch a graph of the two functions and shade in the area.
*July 25, 2012*

**help**

i thought you were a helping site please help i read my lessons but i just coulnd answer some questions. help please i need to pass this test, i would really appreciate it your time. im new to this site
*June 16, 2012*

**Neoclassicism I english 11**

1. Which word does NOT describe Neoclassical literature of the 17th century? balanced religious elegant concise 2. In lines 17-20 of Annus Mirabilis, who is Carthage? Thus mighty in her ships, stood Carthage long, And swept the riches of the world from far; Yet stoop'd to ...
*June 16, 2012*

**english 11 hardtimes novel**

22. What connection can be drawn between Dickens's father and Tom? Both worked in a bank. Both favored straight facts. Both were irresponsible with money. Both had a gambling problem. 23. How do innovations in farming methods contribute to population growth? They results ...
*June 16, 2012*

**Earth Science**

How old is the Gneiss in Greenland?
*June 12, 2012*

**Moanalua Middle School**

One box contains six color cards: two blue, three yellow, and one orange. Another box contains four number cards, numbered 1, 2, 3, and 4. One card is picked at random from each box with replacement. find the probability of blue, then 1.
*May 18, 2012*

**human resources**

The R&D organization has decided it wants to promote total involvement and create a learning organization. The community-building meeting is the mechanism to move this forward. You have decided to bring in other consultants from the Working Better Group to help you plan this ...
*May 11, 2012*

**College Algebra/Geometry**

What size should the frame be?
*May 2, 2012*

**College Algebra/Geometry**

What size should be the frame be? Suppose an artist has a circular picture with a diameter 6 inches which she wishes to frame by a uniform width frame with covers 1/2 inch width uniformity of the painting and has total area equal to that of the exposed painted surface when the...
*May 2, 2012*

**Math**

Roger wants to carpet a rectangular room with the length of 8 ¾ feet and a width of 9 1/3 feet. If he has 85 square feet of carpet, how many square feet of carpet will be left after he covers the floor of the room?
*April 19, 2012*

**english story**

1 bicycles 2. b
*April 13, 2012*

**Math**

If f(x)= x^2 + 2x What is f(-x) What is f(1/a) Thanks!
*March 31, 2012*

**statistics**

a) b)1 c)standard deviation=
*March 26, 2012*

**math**

pete colored 1/2 of a poster. rebecca colored 1/3 of a poster. what fraction still needs to be colored?
*March 13, 2012*

**math**

George is making a circle graph of the basketball shots he made during the season. He made 16 foul shots, 29 two-point shots, and 5 three-point shots. What will be the measure of the angle he makes when creating the sector for foul shots?
*March 8, 2012*

**Algebra**

The profit made from the sale of tiles is found by subtracting the costs from the revenue. (This is the money you take in minus the money you spent.) g. Find the Profit Equation by substituting your equations for R and C in the equation . Simplify the equation. Suppose the ...
*March 5, 2012*

**Algebra**

Suppose your tile company spends $ 195 each month, regardless of how many tiles are purchased as supplies. How much do you spend if you purchase 1000 tiles this month, taking into account this fixed cost? c. What is a possible reason for this fixed cost? d. Find the cost ...
*March 5, 2012*

**math**

1. Suppose you are the owner of a tile company who purchases tiles from a supplier at a rate of $5 each. a. The variable cost is the cost that depends on the quantity, such as how many tiles are purchased. If you buy 100 tiles at $5 each, how much have you spent on tile? What ...
*March 5, 2012*

**Ground School: airport operations**

What is the best way for me to learn more about airport operations??
*February 20, 2012*

**Ground School**

I am taking a ground school class for my private pilot license and am having trouble with weather, what is the best way to go about learning this stuff????
*February 20, 2012*

**math**

Alex takes 3 hours longer to complete a certain job than Barry does. If they can complete the job by working together in 3.6 hours, how long would it take Alex to complete the job working alone? 3.
*February 1, 2012*

**Chemistry**

Hi I need help with a problem The accuracy of what measurement must be increased in order to increase the accuracy for the specific heat? Thank You!
*January 23, 2012*

**business math**

William Bennett earns $12,800 per year. He is paid 12 times per year and claims 1 exemption. His state taxes him at a 3% rate. How much tax is withheld per pay period?
*November 28, 2011*

**spanish**

so are you coming to my house tomorrow? Translate into spanish plzzz
*November 19, 2011*

**Algebra 2**

Simplify a(-2)power divided by b(6)power times c(-8)power so there are no negative exponents
*November 10, 2011*

**math pre cal**

What is the future, rounded to whole dollars, of $25,000 after 7 1/2 years, if money earns at an annual rate of 5.75% compounded continuosly?
*November 1, 2011*

**Chemistry**

What energy is associated with a photon in the infared region of the spectrum having a frequency of 4.5*10^12s^-1
*October 31, 2011*

**us history**

what is another word for nativism
*October 13, 2011*

**Language arts/writing**

An acrostic poem for the bill of rights?
*September 29, 2011*

**algebra**

which of the following expressions can be used to increase 8500 by 2.5%. a. 8500x1.025 b.8500x0.125 c.8500x0.025
*September 9, 2011*

**Math**

VF is a small accounting firm supporting wealthy individuals in their preparation of annual income tax statement. Every December, VF sends out a short survey to their customers, asking for the information required for preparing the tax statements. Based on 24 years of ...
*August 31, 2011*

**algebra**

In your mathematics course, your final grade was twelve points from a B. Your total points for the course were 252. How many points were possible for the course? (Assume 80% of the course total was a B.)
*August 29, 2011*

**trig**

i can not figure out how to write the complex number in rectangular form the question is 4(cos 5Pie/6 + i sin 5 pie/6)
*August 17, 2011*

**math**

h4veyj 5rvjhvv4
*August 8, 2011*

**english**

I need to use at least five different pronouns in my sentences. Can you help? (I) recently asked (my) sister about (her) use of credit cards. (She) told (me) that (she) uses it to make everday purchases. (I) asked (her) if (she) was making any type of payment on them. (My) ...
*July 12, 2011*

**Physics**

Hi, Which correctly expresses the relationship between wavelength (L), speed (V) and perios (T) of a sinusodial wavform ? a) L = T/V b) L= 2fxV/ T c) L= 1 / V x T D) L= V/T e) L = V x T f) L= V x T/ 2f I feel it is option (d) ..please check for me .. and thanx
*July 9, 2011*

**Statistics Math Help**

A distribution of 800 test scores in a biology course was approximately normally distributed with a mean of 35 and a standard deviation of 6. Calculate the proportion of scores falling between 20 and 40
*June 18, 2011*