Saturday

February 13, 2016
Total # Posts: 924

**Physics**

How much water at 20 degrees C is needed to melt 1 kg of solid mercury at its melting point which is -39 degrees C? (The heat of fusion of mercury is 2.8 cal/gram).
*July 20, 2010*

**Physics**

You decide to take a nice hot bath but discover that your thoughtless roommate has used up most of the hot water. You fill up the tub with 270 kg of 30.0°C water and attempt to warm it further by pouring in 5.00 kg of boiling water from the stove. (a) Calculate the final ...
*July 18, 2010*

**SCIENCE**

A pilot of a light plane heads due north at air speed of 400km/h and wind is blowing from the west at a 60km/h.what is
*July 12, 2010*

**chemistry**

Food and Drug Administration (FDA) recommends that adults ingest less than 2.4 g of sodium per day. How many liters of softened water, containing a sodium concentration of 0.050% sodium by mass, have to be consumed to exceed the FDA recommendation? (Assume a density of 1.0 g/...
*July 9, 2010*

**science**

how making inferences help the scientist in their discoveries?
*June 29, 2010*

**alg**

simplify: sqrt (6/11) a) sqrt (66/11) b) 6 c) 6 sqrt (11/11) d)6 sqrt (11)
*June 26, 2010*

**algebra**

thanks jen
*June 26, 2010*

**algebra**

``solve: sqrt (r - 1) + 5 = 2 a) (10) b) (8) c) (50) d) none or 0''. a
*June 26, 2010*

**algebra**

thanks damon
*June 26, 2010*

**algebra**

Find the distance between (-2,9) and (-5,15) a)24.18 b)6.71 c)45.02 d)18.67 just need to know if my answer is right or wrong b
*June 26, 2010*

**alg**

thanks
*June 25, 2010*

**alg**

solve: sqrt (v) - 3 = 6 a) (-9) b) (81) c) (9) d) none or 0 b just need to know if my answer is wrong or right
*June 25, 2010*

**alg**

i got that as well Reiny but thats not one of the answer though
*June 25, 2010*

**alg**

thanks quidditch so much for your help :)
*June 25, 2010*

**alg**

simplify the following radical expression : 4 sqrt (81/16) a)3/2 b)2 c)2/3 d)3 a
*June 25, 2010*

**algebra**

simplify the following radical expression: 4 sqrt(625) a) sqrt (25) b) 25 c)5 d) no solution exists c
*June 25, 2010*

**algebra**

alright
*June 25, 2010*

**algebra**

find the distance between (-2,9) and (-5,15) a) 24.18 b) 45.02 c) 6.71 d)18.67 a
*June 25, 2010*

**algebra**

thanks quidditch
*June 25, 2010*

**algebra**

find the distance between (2/3,4) and (5/3,7) a) 10.06 b) 3.16 c) 3.46 d) 4.24 b
*June 25, 2010*

**algebra**

thanks Quidditch
*June 25, 2010*

**algebra**

find the distance between (0,-5) and (-6,8). a)6.70 b)13 c)14.32 d)3.87 c just need to know if my answer is correct or not thanks
*June 25, 2010*

**algerba**

simplify: sqrt (6/11) a) sqrt (66/11) b) 6 sqrt (11/11) c) 6 d) 6 sqrt (11)
*June 24, 2010*

**algebra**

thanks reiny
*June 24, 2010*

**algebra**

simplify: sqrt(24) a) 6 sqrt (2) b) 4 sqrt (6) c) 4 sqrt (2) d) 2 sqrt (6) d
*June 24, 2010*

**algebra**

simplify: sqrt (28) a) 4 sqrt (7) b) 7 sqrt (2) c) 2 sqrt (7) d) sqrt (7) c im just making show that they are correct sorry for posting up so many
*June 24, 2010*

**algebra**

yeah thats what i meant sorry
*June 24, 2010*

**algebra**

simplify: sqrt (7/9) a0 sqrt (7) b) sqrt (63/3) c) sqrt (63/3) d) sqrt (7/3) d
*June 24, 2010*

**algebra**

thanks jen
*June 24, 2010*

**algebra**

simplify: sqrt (121/9) a) 11/3 b) sqrt (11/3) c) sqrt(11 / sqrt 3) d)3 sqrt (11) a is the answer
*June 24, 2010*

**algebra**

thanks damon :)
*June 24, 2010*

**algebra**

solve:t - sqrt(6t - 9) = 0 a) none or 0 b) (-3,3) c) (3) d) (-3) c
*June 24, 2010*

**algebra**

thanks jen :)
*June 24, 2010*

**algebra**

simplify the following radical expression: sqrt (3) * sqrt (3) a) 3 b) sqt (3) c) none or 0 d)1 just need to know if my answer right or wrong a
*June 24, 2010*

**algebra**

thanks jen :)
*June 24, 2010*

**algebra**

simplify the following radical expression: sqrt (x) * sqrt (x) a) x b) sqrt (x) c)2 d) no soltuion exists just need to know if my answer is correct or not and i picked a
*June 24, 2010*

**algebra**

simplify the following radical expression; 4 sqrt (81/16) a) 2/3 b) 2 c) 3 d) 3/2
*June 24, 2010*

**algebra**

simplify : sqrt (12) - sqrt (27) a) - sqrt(15) b) -15 sqrt (3) c)- sqrt (3) d) -5 sqrt (3)
*June 24, 2010*

**algebra**

thanks reiny
*June 24, 2010*

**algebra**

Simplify: sqrt (21) (sqrt(7) + sqrt(3)) a) 7 sqrt (3) + 3 sqrt(7) b) 7 sqrt(3) + sqrt (3) c) sqrt (210) d) sqrt (147) + sqrt (63)''. a
*June 24, 2010*

**algebra**

thanks
*June 24, 2010*

**algebra**

Solve: 1 + sqrt (6 -n) = 3 a) (-2) b) none or 0 c) (2) d) (2,-2)''. c
*June 24, 2010*

**algebra**

find the midpoint of the segment with endpoints (1/3,-4) and (-2/3,6) a) (-1/3,2) b) (-1/6,1) c) (-1/2,1) d) (1,-1/6)
*June 18, 2010*

**algebra**

thanks damon
*June 18, 2010*

**algebra**

Simplify: 2 sqrt (3) + 4 sqrt (3) a) 18 b) sqrt (9) c) 8 sqrt (3) d) 6 sqrt (3) d
*June 18, 2010*

**algebra **

thanks damon
*June 18, 2010*

**algebra **

Simplify: ( sqrt (2) + sqrt (3) ) ( sqrt (2) - sqrt (3) )? a) 2 - 2 sqrt (6) - 3 b) -1 c) 2 + 2 sqrt (6) - 3 d) 5 i just need to know if my answer or right or wrong. i think the answer is b thanks
*June 18, 2010*

**algebra**

thanks
*June 18, 2010*

**algebra**

Find the distance between (2/3,4) and (5/3,7) a) 3.16 b) 4.24 c) 3.46 d) 10 .06
*June 18, 2010*

**algebra**

the correct answer is c
*June 18, 2010*

**algebra**

simplify the following radical expression : 4 sqrt (625) a) 25 b) sqrt (25) c) 5 d) no solution exists i think a
*June 18, 2010*

**algebra**

alright thanks mathmate
*June 17, 2010*

**algebra**

simplify the following radical expression: 3 sqrt (-27) a) -3 b) 3 c) 0 d) no solution exists do i write the sqrt like this or do i write like this sqrt () 3 -27 please show me the correct way to write it thanks
*June 17, 2010*

**algebra**

thanks jen and mathmate
*June 17, 2010*

**algebra**

simplify the following radical expression: sqrt x * sqrt x a) x b) sqrt x c) 2 d) no solution exists do you know any site that will help me with the square roots? thanks!
*June 17, 2010*

**Financial officer**

If the finance officer who is the interviewer ask a question and ask the question again in a different way that is "overuses questions". I need to know what happens when the interviewer ask overuses questions. What would be the candidates feel or respond and should ...
*June 9, 2010*

**Financial officer**

What happens when the interviewer or manager overuses questions?
*June 9, 2010*

**1st grade**

can you name a story where an animal needs help and no other animal will help them?
*June 1, 2010*

**computers**

A small startup software developer company needs to create a program that will calculate the pay of its employees. For the first version of the program, the company wants the program to accept an employee’s name, the number of hours the employee worked, and the hourly pay...
*May 26, 2010*

**Math**

A basketball player has a 40% shooting average from the free-throw line. If she takes two free throws, estimate the probability that she will make both of them. Use the following list of digits which was taken from a table of random numbers. Let the digits 0-3 represent a made...
*May 24, 2010*

**Math**

What is the measure of the point for a star shaped polygon with 8 points and a dent angle of 130 degrees? How do I work this out?
*May 23, 2010*

**Math**

What is the measure of the point angle for a star-shaped polygon with 8 points and a dent angle of 130 degrees?
*May 23, 2010*

**math**

$36.80 + 56%=
*May 23, 2010*

**Math**

Suppose that a given parallelogram is not a rhombus. Which of the following can you conclude about this parallelogram? A) Its diagonals are perpendicular bisectors of each other. B) It is a square. C) Its sides are not all congruent. D) All of the above I picked C.
*May 23, 2010*

**math**

x+4/2x*6x^2/x^-16= (x+4)/2x*6x(x)/(x+8)(X-8) rational expression using factoring could some check this.
*May 22, 2010*

**math**

8x^3+125 (2x)^3+(5)^3 (2x+3)(5x^2-6x+25) check this for me
*May 17, 2010*

**9th grade**

Is this anwser right 1,2,9,28,49
*May 17, 2010*

**Math**

I still don't understand. Could you explain. I don't know what any of this means.
*May 16, 2010*

**Math**

Use the discriminate to determine how many real number solutions the equation has. s^2 - 5s + 6 = 0
*May 16, 2010*

**Physics**

A body moves in rectilinear motion along the x-axis with an acceleration of a = 24 - t - 6 t^2 . Starting with an initial position at the origin (x = 0) and an initial velocity of 4 ft/s to the left (along the negative x-axis), what is the position of the body at the end of 4 ...
*May 14, 2010*

**Chemistry**

i need to find the; [Cl-] in PbCl2 solution,[Pb2+] in PbCl2 solution, and the ksp given: PbCl2(s)--> Pb2+(aq)+2Cl-(aq) Temp of solution =20.2 volume of Pbcl2 solution=25.00ml mass of dry AgCl2(g)=0.2543g #moles : AgCl(s)=1.77e-3 Cl(aq)=1.77e-3 Pb2+(aq)= 8.85e-4
*April 26, 2010*

**Chemistry**

1500 * 0.05 = 75 75g of K2SO4 to make 1500g of a 5% solution.
*April 26, 2010*

**Chemistry**

v/v = 50 mL / 2500 mL x 100 = 2.0% v/v
*April 26, 2010*

**alcoholic beverages**

so that the cork stays wet
*April 26, 2010*

**chemistry**

i need to find the; sorry i need to find [Cl-] in PbCl2 solution,[Pb2+] in PbCl2 solution, and the ksp given: PbCl2(s)--> Pb2+(aq)+2Cl-(aq) Temp of solution =20.2 volume of Pbcl2 solution=25.00ml mass of dry AgCl2(g)=0.2543g #moles : AgCl(s)=1.77e-3 Cl(aq)=1.77e-3 Pb2+(aq...
*April 26, 2010*

**chemistry**

[Cl-] in PbCl2 solution, M? [Pb2+] in PbCl2 solution, M? ksp? #moles : AgCl(s)= Cl(aq) Pb2+(aq)= Temp of solution =20.2 volume of Pbcl2 solution=25.00ml mass of dry AgCl2(g)=0.2543g
*April 26, 2010*

**History**

I'm writing a paper based on the life of General Douglas MacArthur; however, I'm having trouble figuring out how to outline my report. My question is, how should I outline my report?
*April 18, 2010*

**math**

What is the ratio of 2 positive numbers whose product is 2400 at a 2:3 ratio?
*April 14, 2010*

**math**

what is the sum of 2+3?
*April 12, 2010*

**English**

How does the the notion of colonization impacts on your post-modern or fluid notions of personal idenity?
*April 11, 2010*

**programming**

A small startup software developer company needs to create a program that will calculate the pay of its employees. For the third version of the program, the company wants the program to accept an employee’s name, the number of hours the employee worked, and the hourly pay...
*March 6, 2010*

**programming**

Write Pseudocode and explain the how do you do the program desk check?
*March 6, 2010*

**computers**

A small startup software developer company needs to create a program that will calculate the pay of its employees. For the first version of the program, the company wants the program to accept an employee’s name, the number of hours the employee worked, and the hourly pay...
*March 6, 2010*

**College Chemistry**

ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:4NH3+5O2=4NO+6H2O what is the theoretical yeild of water in moles when 40 g NH3 and 50g O2 are mixed and allowed to react
*March 1, 2010*

**Math**

The length of a rectangle is fixed at 20cm. What widths will make the perimeter greater than 78cm?
*February 26, 2010*

**math**

4 6/9 + 3 7/12=
*February 23, 2010*

**computer history**

what are all the anser
*February 22, 2010*

**Physics**

A car battery is rated at 90A hr, meaning that it can supply a 90A current for 1 hr before being completely discharged. If you leave your headlights on until the battery is completely dead, how much charge leaves the positive terminal of the battery?
*February 17, 2010*

**Physics**

In a typical lightning strike, 2.5 C flows from cloud to ground in 0.20 ms. What is the current during the strike?
*February 17, 2010*

**Physics**

2.0x10^13 electrons flow through a transistor in 1.0ms. What is the current through the transistor?
*February 17, 2010*

**Physics**

A 70 W electric blanket runs at 24 V. What is the resistance of the wire in the blanket? How much current does the wire carry?
*February 17, 2010*

**Physics**

An electric eel develops a potential difference of 460 V, driving a current of 0.80 A for a 1.0 ms pulse. Find the power of this pulse. Find the total energy of this pulse. Find the total charge that flows during the pulse.
*February 17, 2010*

**Physics**

Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.1 M Ohm measured between two electrodes placed 20cm apart along the leaf. The leaf has a width of 2.8 cm and is 0.20 mm ...
*February 17, 2010*

**Physics**

The relatively high resistivity of dry skin, about 1x10^6 Ohm m, can safely limit the flow of current into deeper tissues of the body. Suppose an electrical worker places his palm on an instrument whose metal case is accidently connected to a high voltage. The skin of the palm...
*February 17, 2010*

**Physics**

You've made the finals of the Science Olympics! As one of your tasks, you're given 1.1g of copper and asked to make a cylindrical wire, using all the metal, with a resistance of 1.7 Ohm. What length l will you choose for your wire? What diameter d will you choose for ...
*February 17, 2010*

**Physics**

An electric catfish can generate a significant potential difference using stacks of special cells called electrocytes. Each electrocyte develops a potential difference of 110 mV. How many cells must be connected in series to give the 350V a large catfish can produce?
*February 17, 2010*

**Physics**

When a nerve cell depolarizes, charge is transferred across the cell membrane, changing the potential difference. For a typical nerve cell, 9.0 pC of charge flows in a time of 0.50ms. What is the average current(Value and units)?
*February 17, 2010*

**Physics**

You've made the finals of the Science Olympics! As one of your tasks, you're given 1.8g of copper and asked to make a wire, using all the metal, with a resistance of 1.3 Ohm. Copper has a density of 8900 kg/m^3. What length will you choose for your wire(in meters)? ...
*February 17, 2010*

**math**

what is the value of y- coordinate of the solution to the system of equation x + 2y = 9 and x- y= 5
*January 28, 2010*