Saturday

April 25, 2015

April 25, 2015

Total # Posts: 1,965

**intro to chemistry (college)**

A 64.8 g mixture of the compounds potassium sulfide and calcium oxide is 17.1 % by mass potassium sulfide. The compound calcium oxide is 71.5 % by mass calcium. Calculate the mass (g) of oxygen in the mixture. mass % = mass part/mass whole x 100. I attempted the problem by ...
*May 3, 2012*

**Chem**

Dissolving 3g of ascorbic acid in 50g of acetic acid lowers the freezing point of acetic acid by 1.33degreesC. What is the molecular mass of ascorbic acid?
*May 2, 2012*

**math**

128fl oz in a gallon
*May 1, 2012*

**english**

This summer my best friend and I will be going to a theme park. I always enjoy myself when I am with my friend so I am sure that the trip will be fun. I have yet to go to this theme park, and according to one of my classmates it holds the worlds highest coaster. I cant wait ...
*May 1, 2012*

**Physics (Spring force constant)**

Please help me i cant figure out what goes in the blanks and this is the last question of my gizmo... THANKS! If the spring constant is 100 N/m, the period is equal to the _____________ _____________ of the mass multiplied by _____________. If the mass is held constant at 1.0 ...
*May 1, 2012*

**Calculus**

you have 1000 yards of fencing and you plan to use the fencing to make 2 enclosures, one circular and one a square. How much of the 1000 yard of fencing should be used for each region if you want to maximize the combined area of both regions Let x yards of fence be used for ...
*April 30, 2012*

**Calculus**

you have 1000 yards of fencing and you plan to use the fencing to make 2 enclosures, one circular and one a square. How much of the 1000 yard of fencing should be used for each region if you want to maximize the combined area of both regions Let x yards of fence be used for ...
*April 30, 2012*

**science**

how is the Maunder minimum and the little ice age related events?
*April 30, 2012*

**chemistry**

1.0 M aqueous solutions of AgNO3 , Cu(NO3 )2 and Au(NO3 ) 3 are electrolyzed in the apparatus shown, so the same amount of electricity passes through each solution. If 0.10 moles of solid Cu are formed how many moles of Ag and Au are formed?
*April 27, 2012*

**math**

What's the length of the arc ab and the area of the sector aob
*April 27, 2012*

**math**

Find the terms. Leave coefficients as factorials term with t^5 in (v-t)^17 term with x^10 in (x+y)^19
*April 26, 2012*

**math**

the conversion for .1959 cm = m
*April 26, 2012*

**CHEMISTRY**

What is the [H+] in a 0.10 M solution of ascorbic acid,C6H8O6?
*April 25, 2012*

**Physics**

A ball is thrown from a building standing 30m high, landing 10m away from the building 3.2 seconds after it was thrown. Find the angle above the horizontal and the initial velocity of the ball
*April 25, 2012*

**math**

If 3feet*50metre is Rs.8720,how much would 2feet*40metre cost?
*April 24, 2012*

**math**

How much money should be invested today in order to have $100,000 in an account after 40 years if the rate is 6.8% compounded quarterly?
*April 23, 2012*

**algebra 2**

Jennifer invested $2,500 in an account earning 3.5% interest compounded continuosly. How much money will she have in the account after 15 years?
*April 23, 2012*

**math**

A ramp that is 4 ft., 3 ft.at one end. I want a 30% slope to the ground; how long should the ramp be?
*April 23, 2012*

**pre-calc help**

cos^2(x/2)-sin^2(x/2) 2sin(x/2)cos(x/2)
*April 21, 2012*

**lOTS OF PHYSICS :)**

41. Is the speed of light constant as it passes through transparent materials? Yes, the speed of is always constant No, light travels at different speeds through different materials 42. A lens that causes light to diverge is A converging lens A diverging lens Fish-eye lens 43...
*April 18, 2012*

**pHYSICS hELP rATIONAL SPEEDS OF DISKS**

If rotational speed of a disc remains constant, what happens to the speed of a point on the disc if its distance from the axis is doubled? It stays the same It also doubles It triples It quadruples
*April 18, 2012*

**physics**

A projectile is launched at an angle of 600. What other angle would give the same range for the projectile if we neglect air resistance?
*April 18, 2012*

**Physics**

A ferryboat traveling at a speed of 30 km/h attempts to cross a river with a current of 5 km/h. What is the boat's speed relative to the shore? 8 km/h 25 km/h 30.4 km/h 32.8 km/h
*April 18, 2012*

**anatomy and physiology**

what lifestyle factors of the muscle affect the growth, development, size and/or healing (positively or negatively) of the tissue?
*April 16, 2012*

**anatomy and physiololgy**

what lifestyle factors of the bone affect the growth, development, size and/or healing (positively or negatively) of the tissue.
*April 16, 2012*

**science**

A 1.4 kg ball and a 3.0 kg ball are connected by a 1.0 m long rigid, massless rod. The rod is rotating cw about its center of mass at 24 rpm. What torque will bring the balls to a halt in 4.2 s?
*April 15, 2012*

**English (Comma Question)**

I think the first sentence is correct.
*April 12, 2012*

**English (Comma Question)**

Which of the following sentences is correct? "James arrives and, after a period of confusion, Mary's secret is revealed." "James arrives, and after a period of confusion, Mary's secret is revealed." "James arrives and after a period of ...
*April 12, 2012*

**8th grade math**

A truck rental company charges $20 plus 9 cents per mile.Joe's friend offers to rent Joe his truck for $35 and won't charge him mileage. What is the minimum number of miles Joe has to drive to save money using his friend's truck? 17?, 55?, 121? or 167?
*April 12, 2012*

**Finance**

A grocery store manager must decide whether to buy four rug cleaners to rent to customers. The manager estimates that the first would yield $200 a year, the second $150, the third $75, and the fourth $20. If the interest rate is 12 percent and each rug cleaner costs $500, how ...
*April 12, 2012*

**geometry**

easy simply 286x2= whatever than do 63x4= whatever your thanks ( come from canada just joking ) your welcome :-)
*April 11, 2012*

**chemistry**

What would the final freezing point of water be if 3 mol of sugar were added to 1 kg of water (Kf = 1.86C/(mol/kg) for water and i = 1 for sugar)?
*April 11, 2012*

**physics**

The system in the Figure is in equilibrium. A mass M1 = 242.0 kg hangs from the end of a uniform strut which is held at an angle theta = 41.0o with respect to the horizontal. The cable supporting the strut is at angle alpha = 27.0o with respect to the horizontal. The strut has...
*April 10, 2012*

**physics**

The weightless horizontal bar in the figure below is in equilibrium. Scale B reads 4.00 kg (N.B. as you know, the scale should read N, but no one told the manufacturer). The distances in the figure (which is not to scale) are: D1 = 9.0 cm, D2 = 8.0 cm, and D3 = 6.5 cm. The ...
*April 10, 2012*

**math**

Jane needs to fill her pool with water. Ace said it will take them 40 minutes to fill the pool. Ben said it will take them 60 minutes to fill the pool. How long it will take for both Ace and Ben to fill the pool at the same time?
*April 6, 2012*

**chemistry**

16.67ml
*March 28, 2012*

**Math**

Based on the data, of 40% Reading and 25% Math, Out of 240 students, how many would choose reading or math as their favorite subject?
*March 27, 2012*

**Chemistry**

The Energy from glucose is obtained from the oxidation reaction C6H12O6 + 6O2 --> 6CO2 + 6H2O How would a similar reaction look for Sucrose? I am trying to find an equation about how the body uses a compound, in this case sucrose. I'm just not sure how different that ...
*March 22, 2012*

**Physics**

0.17meter
*March 20, 2012*

**math**

If (x – 3) divides evenly into x3 – x2 – kx + k, find k. (2 marks)
*March 20, 2012*

**math**

Complete the square to find the vertex of each quadratic function. State the vertex. (10 marks) A) f(x) = x2 + 8x – 3 B) f(x) = x2 – 5x + 8 C) f(x) = 2x2 – 12x + 1 D) f(x) = 3x2 + 2x – 5
*March 20, 2012*

**math**

Determine the remainder of the following polynomial divisions: (2 marks) A) (4x4 + 3x2 - x + 3) ÷ (x + 1) B) (3x2 + 2x - 7) ÷ (2x - 1)
*March 20, 2012*

**math**

Solve for x in the following equations. (4 marks) log3(x - 5) + log3(x + 3) = 2 <--- both log3.. 3 is subscript log7x + log7(x - 1) = log72x <--- all log7.. 7 is subscript.
*March 19, 2012*

**math**

log(27) / log(1/3) log(3^3) / log(3^-1) 3 log(3)/-1 log(3) -3
*March 19, 2012*

**math**

a) Log2(x^2 – 9/x^3)^3 <----- log2 2 is subscript. b)loga 5a^4 <---- loga a is subscript.
*March 19, 2012*

**math**

On the outside of what kind of triangle? right triangle or what? If you copy and paste the picture it might help or go more in depth with details please. Is that the entire question? Help me help you hahaha
*March 15, 2012*

**math**

I want to help but i feel as though i dont have all the info i need. Are angle 1 and 3 perpenticular or suppose to be similar or on the inside of a triangle?
*March 15, 2012*

**math**

Is this about a triangle or what?
*March 15, 2012*

**Chemistry (buffers)**

Say, for example, that you had prepared a Buffer C, in which you mixed 8.203 g of sodium acetate, NaC2H3O2, with 100.0 mL of 1.0 M acetic acid. a. What would be the initial pH of Buffer C? HOW???????
*March 15, 2012*

**math**

Write the expression as a logarithm of a single quantity. (4marks) A)3log5a + 4log5b - 2log5c B)3log2 -1/3log(x^2-1)
*March 15, 2012*

**math**

Find the value of each of the following. Leave your answers as fractions where appropriate. Do not change bases. a) log4 (1/8) B)10^(-10log3)<---superscript in brackets c.2log3<-----subscript.9 d.log3<---subscript.3^2x
*March 15, 2012*

**maths**

In slope intercept form as you increase one value of S, T increases by two so the formula can be T=2S+5
*March 15, 2012*

**math**

The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T=2π√ L/9.8 State the domain and range of this function. (1 mark) ...
*March 13, 2012*

**math**

The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T=2π√ L/9.8 Write this equation in function notation. (1 mark) State...
*March 12, 2012*

**Calculus; Limits**

The percentage of research articles in a prominent journal written by researchers in the United States can be modeled by A(t) = 26 + (36/1 + 0.8(0.8)^−t'), where t is time in years (t = 0 represents 1983). Numerically estimate lim as t→+infinity A(t). I ...
*March 11, 2012*

**Math**

This problem pertains to Cuisenaire Rods: 1-white 2-red 3-green 4-purple 5-yellow 6-dark green 7-black 8-brown 9-blue 10-orange Question: (a) If an all-brown train is equal in length to an all-orange train, what can be said about the number of brown rods compared to the number...
*March 10, 2012*

**Networking**

I wanted to know if the MAC address is needed to be changed and does the ip address need to change if I move my computer from my home and into my office at work which are not on the same network?
*March 9, 2012*

**Chemistry**

I'm not sure what it's asking. I know I need to write out the aqueous parts and write the charges, but I don't how to do that. Mostly I need help getting it to the Gross Equation.
*March 8, 2012*

**Chemistry**

Write the Gross and Net Ionic Equations for the following Reactions: LiNO3(aq)+(NH4)3N(aq) => Li3N(s)+ NH4NO3(aq) Al(s)+CuCl2(aq) => AlCl3(aq)+Cu(s)
*March 8, 2012*

**Physis**

A bullet of mass of 30g and travelling at a speed of 200msˉ¹ embeds itself in a wooden block. The bullet penetrates a distance of 12cm into the wood. Using the concepts of work done by a force and kinetic energy, determine the average resistive force acting on the ...
*March 8, 2012*

**business**

they changed the answers on penn foster
*March 7, 2012*

**please answer this Ms. Sue**

how do you write a fraction as a decimal?
*March 6, 2012*

**MS. SUE PLEASE ANSWER**

i got it now thanks. its 55/100 12/100 60/100 5/10 75/100
*March 6, 2012*

**MS. SUE PLEASE ANSWER**

.25 .75 .3 .5 .40 .60 .08 .12 .55 those are the ones I need help on
*March 6, 2012*

**MS. SUE PLEASE ANSWER**

i still dont geit
*March 6, 2012*

**MS. SUE PLEASE ANSWER**

how do you write a fraction for a decimal?
*March 6, 2012*

**science**

A 5kg object is resting on top of a 30m building. How much energy does the object have?
*March 5, 2012*

**Chemistry**

I can't figure out a clear way to write out the formatting of the question, but here is a picture. Any help is greatly appreciated. the image is on the website imggur and then then after imgur dot com its /Cus8o
*March 1, 2012*

**Chemistry**

The following reaction exhibits the rate law: Rate = k[NO2]^2[Cl2]. 2NO(g)+Cl2(g)---->2NOCl (g) (a) Explain why the following mechanism is not plausible for this reaction. Fast: NO + Cl2<-->NOCl + Cl Slow: NO + Cl---->NOCl (b) Propose a two-step mechanism involving...
*March 1, 2012*

**Microbiology**

What if you found gas in the Lab tubes but none in the BGLB thow does this affect the EC test
*February 29, 2012*

**math**

a textbook has 50 more than two times the number of pages as a workbook. combined, they have 230 pages. how many pages are in the textbook?
*February 29, 2012*

**geometry**

a ladder is placed against the side of a building at an angle of 50 degree. the ladder's base is 10ft away from the base of the building. How long is the ladder?
*February 28, 2012*

**Physics**

A spring is mounted horizontally. A crate which has a mass of 8.5kg is pressed against the spring with a force of 350N. As a result the spring is compressed a distance of 82.0cm. The mass is then released and is allowed to slide along the horizontal, frictionless surface. What...
*February 26, 2012*

**math**

Gemma is making necklaces. She needs 10 beads for each one. She has 64 beads altogether. how many necklaces can she make?
*February 26, 2012*

**physics work and energy**

A mass of 45kg is sitting at the bottom of an incline plane which is 5.5m long has a coefficient of friction of .65 and which meets the horizontal at an angle of 32deg. A force of 812N is applied to the mass so as to accelerate the mass up the inclined plane. What will be the ...
*February 25, 2012*

**THERMOCHEMISTRY**

An ice hotel that is made of 410 metric tons of ice and 12200 metric tons of snow is being melted. The company is going to siphon the melted water into nearby streams. The company is using large industrial sized acethylene to do the job. Your job is to order the rigth amount ...
*February 21, 2012*

**calculus**

A 33 by 33 square piece of cardboard is to be made into a box by cutting out equal square corners from each side of the square. What size corners should be cut out so that the volume of the box is maximized?
*February 20, 2012*

**Chemistry**

Ok thank-you anyway. I appreciate it.
*February 18, 2012*

**Chemistry**

Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in ...
*February 18, 2012*

**Chemistry**

Look up the solubility of NaCl in both water and ethanol (in the CRC handbook of chemistry which i don't have access to, and any help would be appreciated) Consider the dissolution process, and competing intermolecular forces to account for the observed differences in ...
*February 17, 2012*

**Chemistry**

Acetic acid is a polar molecule and can form hydrogen bonds with water molecules. Therefore, it has high solubility in water. Yet acetic acid is also soluble in benzene (C6H6), a nonpolar solvent that lacks the ability to form hydrogen bonds. A solution of 3.8g of CH3COOH in ...
*February 17, 2012*

**Chemistry**

Hydrogen gas dissolves in palladium with the hydrogen molecules going into the spaces between the metal ions. Determine the molarity, molality, and percent by mass of the H2:Pd solution (d=10.8g/cm)containing 0.94g hydrogen gas dissolved in 215 grams of palladium metal.
*February 17, 2012*

**Chemistry**

THANK YOU!
*February 17, 2012*

**Chemistry**

I am lost about where to start on this. "The idea comes to mind to put some hot rocks in your frozen bath water. What mass of rocks at 220 degrees Celsius needs to be added to 500.0L of frozen bath water at 0 degrees celsius to raise its temperature to 55 degrees celsius...
*February 17, 2012*

**math**

The length of time that it takes for a pendulum to make one complete swing depends on the length of the pendulum. The time in seconds, T, is related to the length in metres, L, through the equation T=2π√ L/9.8
*February 15, 2012*

**math**

A student was given the function f(x) = x2 and asked to write the result of translating this function 1 unit to the left. The student wrote the following: g(x) = (x+1)2. Is this statement correct? Explain.
*February 15, 2012*

**math**

my x and y are in ml not liters..
*February 15, 2012*

**math**

??I got this when I followed steve's steps... optimal solution: c=191/23; x=2750/23; y=3000/23; z=0
*February 15, 2012*

**AP English Literature**

Thank you so much. I really appreciate it.
*February 13, 2012*

**AP English Literature**

E) synecdoche is that the correct answer?
*February 13, 2012*

**AP English Literature**

Can someone please help me? In Jane Eyre in chapter 1 with the quote, "every nerve I had feared him; and every morsel of flesh on my bones shrank when he came near," all the literary devices illustrate all of the following EXCEPT A) parallelism, B) hyperbole C) ...
*February 13, 2012*

**AP English Literature**

"every nerve I had feared him; and every morsel of flesh on my bones shrank when he came near," uses all of the literary devices EXCEPT A) parallelism, B) hyperbole, C) paradox, D) personification, E) synecdoche
*February 13, 2012*

**MATH**

If 2 angles are adjacent, can it also be said they form a linear pair? Why?
*February 12, 2012*

**physics**

If the magnitude of the electric field in air exceeds roughly 3 106 N/C, the air breaks down and a spark forms. For a two-disk capacitor of radius 49 cm with a gap of 1 mm, what is the maximum charge (plus and minus) that can be placed on the disks without a spark forming (...
*February 10, 2012*

**physics**

a spherical gaussian surface of rdius R surrounds a point charge of magnitude +Q. How does the flux through the spherical surface change if the sign of the charge is reversed and the Gaussian sphere is doubled?
*February 10, 2012*

**GEOMETRY**

Is it true that vertical angles must be oriented north-south?
*February 9, 2012*

**math**

john brought a new aquarium. How many gallons of water will john need to fill the tank three quarters of the way full? the tank is 12 inches tall and 19.25 long [1 gallon = 231 cubic inches] the tank is square
*February 9, 2012*

**chemistry**

How many electrons are in the highest occupied energy level of these atoms? Na(sodium) Al (aluminum) F(fluorine) C(carbon)
*February 8, 2012*