Tuesday

May 5, 2015

May 5, 2015

Total # Posts: 1,981

**Physics**

what grade are you in???
*November 20, 2013*

**Maths**

Factorise into quadratics X^2-4x-21 X^2-4x+3 X^2+9x-36
*November 18, 2013*

**socialstudies(check answers please)**

no help at all
*November 18, 2013*

**Chemistry**

Could you please show work, too? I'm really trying to understand it.
*November 17, 2013*

**Chemistry**

Hi I need help with these following questions. I have all of the data needed. Calculate the enthalpy change of the reaction for each trial (in kJ) 3. Calculate the heat released by the reaction for each trial (in J): 2. Calculate the heat absorbed by the calorimeter for each ...
*November 17, 2013*

**Chemistry**

16.3L N2 at 25 degrees Celsius and 125 kPa and 41.9L O2 at 25 degrees Celsius and 125 kPa were transferred to a tank with a volume of 5.25L. What is the total pressure at 55 degrees Celsius?
*November 14, 2013*

**phyics**

A 11.7-kg uniform board is wedged into a corner and held by a spring at a 50.0° angle, as the drawing shows. The spring has a spring constant of 230 N/m and is parallel to the floor. Find the amount by which the spring is stretched from its unstrained length.
*November 12, 2013*

**phyics**

A simple pendulum is made from a 0.781-m-long string and a small ball attached to its free end. The ball is pulled to one side through a small angle and then released from rest. After the ball is released, how much time elapses before it attains its greatest speed?
*November 12, 2013*

**phyics**

Objects of equal mass are oscillating up and down in simple harmonic motion on two different vertical springs. The spring constant of spring 1 is 175 N/m. The motion of the object on spring 1 has twice the amplitude as the motion of the object on spring 2. The magnitude of the...
*November 12, 2013*

**phyics**

A block of mass m = 0.510 kg is fastened to an unstrained horizontal spring whose spring constant is k = 85.3 N/m. The block is given a displacement of +0.112 m, where the + sign indicates that the displacement is along the +x axis, and then released from rest. (a) What is ...
*November 12, 2013*

**Health part 2**

B
*November 5, 2013*

**Physics **

A 59-kg person on skis is going down a hill sloped at 30° from the horizontal. The coefficient of friction between the skis and the snow is 0.10. What would be the magnitude of the acceleration?
*November 5, 2013*

**Math**

Thanks
*October 31, 2013*

**Math**

1.62 is divible by which of the following numbers? A.1,3,31,62 B.1,2,3,31 C.1,4,16,62 D.1,2,31,62 I PICKED D. ------------------------------- 2.108 is divisible by which of the following sets of numbers? A.1,2,3,4,6,9,12,18,27,36,54,108 b.1,2,4,27,54,108 C.1,2,3,6,18,36,54,108...
*October 31, 2013*

**math**

Please tell me the answers i need it soo badly
*October 31, 2013*

**calculus**

A trough is 6 feet long and has ends that are isosceles triangles that are 1 foot high and 3.5 feet wide. If the trough is being filled at a rate of 9 cubic feet per minute, how fast is the height of the water increaseing when the height is 5 inches?
*October 28, 2013*

**calculus**

A street light is at the top of a 15.000 ft. tall pole. A man 6.300 ft tall walks away from the pole with a speed of 6.000 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 45.000 feet from the pole?
*October 28, 2013*

**Chemistry**

A student began adding titrant to the acid solution, but stopped when she suddenly realized that she forgot to add the 3 drops of phenolphthalein. When she did, the solution immediately turned dark red! What can the student do to correct this error and salvage this trial, so ...
*October 27, 2013*

**Physics**

A ball whirls around in a vertical circle at the end of a string. The other end of the string is fixed at the center of the circle. Assume that the total energy of the ball-Earth system remains constant. (a) What is the tension in the string at the bottom? (Use the following ...
*October 21, 2013*

**Chemistry**

A mixture of C3H8 and C2H2 has a mass of 2.3g . It is burned in excess O2 to form a mixture of water and carbon dioxide that contains 1.6 times as many moles of CO2 as of water. What is the mass of C2H2 in the original mixture?
*October 19, 2013*

**science help!!!**

2 is right but are u trying?
*October 18, 2013*

**Geology**

Can someone please help me with my review? 1)What grade of metamorphism common rocks are formed in- --- Is it high grade? 2)What is the name of the most rapid kind of mass wasting is> -- Weathering? 3)How to tell is a rock is igneous, metamorphic or sedimentary. 4)How to ...
*October 17, 2013*

**Geogoly**

Can someone please help me with my review? 1)What grade of metamorphism common rocks are formed in- --- Is it high grade? 2)What is the name of the most rapid kind of mass wasting is> -- Weathering? 3)How to tell is a rock is igneous, metamorphic or sedimentary. 4)How to ...
*October 17, 2013*

**Physics**

A drag racer starts her car from rest and accelerates at 9.2 m/s2 for the entire distance of 631 m. How long did it take the car to travel this distance? Answer in units of s
*October 13, 2013*

**Chemistry**

What are the equations for these two equations? Not net ionic equations. a) Nickel (II) chloride and iron b) Sodium and water
*October 12, 2013*

**Chemistry**

Thanks Dr.Bob. For number three. Cl is Chlorine. And for number 6 K4C is potassium carbide. I wanted the combustion formula for that. I guess what it creates when it undergoes combustion.
*October 10, 2013*

**Chemistry**

I've figured out number 7.
*October 10, 2013*

**Chemistry**

I have a few question for my review. 1) How would you prepare 30.0 ml of 0.600M HNO3 From a stock solution of 4.00M HNO3? What volume in ML of the 4.00 M HNo3 will you need? 2) if a 83.5 & was repoarted for a reaction that could have produced 12.1 g of product? what was the ...
*October 10, 2013*

**Physics**

A bullet of mass 10.6 grams is fired with a speed of 125 meters per second toward a wood block of mass 187 grams initially at rest on a very smooth (assume frictionless) surface. What is the change in momentum of the bullet if it becomes embedded in the block?
*October 10, 2013*

**physics**

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then attached to ...
*October 9, 2013*

**PHYSICS**

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then attached to ...
*October 9, 2013*

**Chemistry**

Volume of sample (mL) 100ml Mass of sample (g) 100g Density (g/mL) 1g/ml
*October 6, 2013*

**Chemistry**

In the space below, show your work for determining the volume, mass, and moles of baking soda Moles of baking soda reacted Mass of baking soda reacted (g) Volume of baking soda reacted 140 ml of vinegar 5 tsps of baking soda were used
*October 6, 2013*

**Chemistry**

You have three solutions, A, B, and C, each of which are believed to be one of the following: calcium hydroxide, potassium sulfate, and sodium chloride. Combining B and C results in the formation of a precipitate, but neither solution forms a precipitate with A. Also, adding ...
*September 29, 2013*

**Physics**

A plane, diving with constant speed at an angle of 52.0° with the vertical, releases a projectile at an altitude of 790 m. The projectile hits the ground 6.00 s after release. (Assume a coordinate system in which the airplane is moving in the positive horizontal direction...
*September 26, 2013*

**trig**

Let sin A = 12/13 with 90º≤A≤180º and tan B = -4/3 with 270º≤B≤360º. Find tan (A - B).
*September 12, 2013*

**trig**

Evaluate and simplify tan 5π/12.
*September 12, 2013*

**trig**

This identity means that translating a basic sine graph 3π/2 units to the right produces a basic cosine graph. True or False? sin(X-(3(pi)/2)) = cosX
*September 12, 2013*

**computers**

Duane will use an open system LAN because he knows the open system will support varieties of hardware and software components made by different vendors. Steve will use a closed system LAN because he knows the closed system is favored by network manufacturers. Who is using the ...
*September 1, 2013*

**Chemistry**

hey thanks...
*August 28, 2013*

**Chemistry**

1. Hydrogen gas combines with oxygen gas to yield water. if 15 g O2 is present in the reaction, compute how much water will be produced. 2. Ten (10)grams methane gas combines with oxygen gas to form water and carbon dioxide. How much water is produced from the given reaction? ...
*August 28, 2013*

**College Algebra**

A family drove 1080 miles to their vacation lodge. Because of increased traffic density, their average speed on the return trip was decreased by 6 miles per hour and the trip took 2.5 hours longer. Determine their average speed on the way to the lodge.
*July 13, 2013*

**College Algebra**

10x^2(x-8)^1/3 + 15x(x-8)^4/3
*July 13, 2013*

**Math**

Let y=f(x) be a function with domain=[-7,8] and range=[-12,9]. Find the range of the function y=-f(2x)
*July 8, 2013*

**Chemistry**

The Henry\'s law constant for CO2(g) in water at 25 °C is 29.4 bar·M–1. Estimate the concentration of dissolved CO2(g) in a carbonated soft drink pressurized with 1.95 bar of CO2(g).
*July 5, 2013*

**Accounting Theory**

IBelieve this is the right answer, but I'm not totally sure goodwill was calculated correctly. Year 0 1 Balance Sheet Cash $0.00 $750.00 Investment(Book Value) $962.28 $641.52 Total Assets $962.28 $1,391.52 Net Worth Invest Capital $962.28 $962.28 Retained Earnings $0.00 $...
*June 30, 2013*

**Accounting Theory**

Instructions: The Company has one asset. The asset has a three-year life and two possible payoffs each year: 1) $750 with a probability of 40%, and 2) $100 with a probability of 60%. The company depreciates assets using the straight-line method. Assume the states between years...
*June 30, 2013*

**VBA Programming**

I'm trying to create a macro that asks for a loan between 1 dollar and 5 million, and returns different interest rates based on the amount of the loan. For some reason when I type in different loan amounts it automatically makes my rate ".1", when it should be ...
*June 28, 2013*

**VBA programming**

How to get isnumeric function to display an "error" message when necessary. Sub DetermineinterestSelectCase() Dim loan As Variant Dim interest As Double loan = InputBox("Enter your desired loan amount, from 1 dollar to 5 million dollars.") Select Case loan ...
*June 28, 2013*

**Chemistry**

If the absolute temperature of a gas is doubled, what happens to the root-mean-square speed of the molecules?
*June 21, 2013*

**Chemistry**

Could you elaborate? I don't quite understand what that means.
*June 19, 2013*

**Chemistry**

Calculate the standard enthalpy change for the following reaction at 25 °C. MgCl2(s) + H2o(l) ---> MgO(s) + 2HCl(g)
*June 19, 2013*

**math **

thanks for your help Mrs.Sue
*May 28, 2013*

**math please help:asap**

30
*May 28, 2013*

**math please help:asap**

what is the answer to: 3/5 + 1/3 + 1/6
*May 28, 2013*

**math**

what is the common factor Matty?
*May 28, 2013*

**math**

The answer is 1 1/10 you see just find the the common factor so kim that it little sis opps
*May 28, 2013*

**math**

I understand you subtract, but what determines that you should divide 110 by 5?
*May 23, 2013*

**math**

Where does the 5f come from??
*May 23, 2013*

**Calculus**

A ladder of length 10 metres is being drawn up a wall. The top of the ladder is moving upwards at 1 metre per second. Find the speed with which the foot of the ladder is approaching the wall when the foot is 6 metres from the wall.
*May 22, 2013*

**mathematic**

0.05
*May 18, 2013*

**finance**

what is the future value of $2000.00 given that it will be held in a bank for 9 years and earn an interest of 4%?
*May 15, 2013*

**physics**

You can paddle at 4.5 km/h and the river is ﬂowing at 3 km/h. How far downstream will you be in 44 min? Answer in units of km
*May 12, 2013*

**math**

So how many cakes?
*April 30, 2013*

**math**

An eight-inch square cake serves six people.how many twelve-inch square cakes do you need to provide equivalent servings for eighteen people?
*April 30, 2013*

**pre calculus**

Environmental Concerns: The spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t) = 200sqrt t, find the area A of the oil slick as a function of the time t. I dont get this at all. could someone please ...
*April 24, 2013*

**statistics**

0.57 of all college students like the idea of a new curriculum. If we select 88 students (ASSUME INDEPENDENCE), what is the Standard Deviation of (the Probability Distribution that would list the number of students (from 0 to 88) and the probability of each.) THE STANDARD ...
*April 24, 2013*

**statistikc**

3. 111.07 and i think E
*April 24, 2013*

**Chemistry**

Could somebody please explain why in gaseous reaction the collision frequency between molecules is far greater than the rate at which molecules react? Thanks! :)
*April 20, 2013*

**Chemistry**

But how can I explain it, concisely, in words?
*April 19, 2013*

**Chemistry**

The structures of NO and NO2 possess similarity to free radicals. How are they similar in electronic terms?
*April 19, 2013*

**Chemistry**

What method of purification is used to separate iodoethane from traces of hydrogen iodide? Thanks :)
*April 18, 2013*

**Chemistry**

On strong heating, 12g of NaHSO4 release 0.9g of water vapour and a white solid is left. Deduce a chemical formula for the solid. How can I work this out? Thanks :)
*April 18, 2013*

**Chemistry**

How is solvent extraction by ether used to separate organic entities from mixture of salt,phenol & phenylamine? Thanks!
*April 16, 2013*

**Chemistry**

How is solvent extraction by ether used to separate organic entities from mixture of salt,phenol & phenylamine? Thanks!
*April 16, 2013*

**Chemistry**

How is solvent extraction by ether used to separate organic entities from mixture of salt,phenol & phenylamine? Thanks!
*April 16, 2013*

**math**

if two squares have the same area of 2500 meters squared,when combined what is the perimeter?
*April 9, 2013*

**math**

Thank you very kind sir/ma'am you were a big help.
*April 9, 2013*

**math**

Step by step is what I meant.
*April 9, 2013*

**math**

That is what I don't get.Please can you show me how to do it.
*April 9, 2013*

**math**

How to solve for x.(i am terrible at this)
*April 9, 2013*

**math**

How do you that rbowh? I am really bad at this.(step by step please)
*April 9, 2013*

**math **

A math contest consists of ten problems.Three points are given for each correct answer. One point is deducted for each incorrect answer. Andy answers all the problems and scores 18 points. How many correct answers does he have?
*April 9, 2013*

**Math**

15-(12(divided by)2)+(-3x4)
*April 9, 2013*

**Chemistry**

Consider the salt FeSO4.7H20. What quantity in grams of salt could be produced from 1g of iron, assuming the overall reaction yield is 75% ? :) Thanks in advance!
*April 5, 2013*

**Chemistry**

Describe how one would obtain the stated pure product from the following mixtures and assume that this cannot be achieved simply by distillation of the original mixture: 1. benzoic acid from a mixture with ammonium benzoate 2. phenylamine from a mixture with nitrobenzene, HCl ...
*April 5, 2013*

**Chemistry**

Calculate the change in pH if 0.050 g of solid NaOH is added to 250 mL of a buffer solution that contains 0.80 M NaH2PO4 and 0.17M Na2HPO4. I found the pH of the buffer solution to be 6.54.
*April 4, 2013*

**Programming and Design**

Draw the hierarchy chart and design the logic for a program that calculates the projected cost of an automobile trip. Assume that the user's car travels 20 miles per gallon of gas. Design a program that prompts the user for a number of miles driven and a current cost per ...
*April 3, 2013*

**Math**

I need to verify this equation and I get stuck after trying everything I can think of. Help! cos(4x)=4[sin(x)cos(x)-sin^3(x)cos(x)]
*April 2, 2013*

**physics**

A uniform, 264-N rod that is 2.05 m long carries a 225-N weight at its right end and an unknown weight W toward the left end. When W is placed 47.9 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 82.7 cm from the right end. ...
*April 2, 2013*

**Repost- Already Solved-Calculus**

is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you Thank you 'gain!
*March 31, 2013*

**Chemistry**

Calculate both the moles and grams in each of the following? a. 6.02 x 10^23 atoms of Na e. 3.01 x 10^23 atoms of S
*March 24, 2013*

**Math**

write an equation which must be true if the line from p(x,y) to a(25,0) is perpendicular to the line from P(x,y) to the center of the circle x^2+y^2=400
*March 23, 2013*

**Math**

write an equation which must be true if the line from p(x,y) to a(25,0) is perpendicular to the line from P(x,y) to the center of the circle x^2+y^2=400
*March 23, 2013*

**physics**

After falling from rest from a height of 26 m, a 0.49-kg ball rebounds upward, reaching a height of 16 m. If the contact between ball and ground lasted 1.8 ms, what average force was exerted on the ball?
*March 20, 2013*

**Accounting 202**

I would suggest lowering miscellaneous expenses. They seem to be a large amount and we do not know what for. This takes away from the companies revenue and budget for the next year. Also, you could look at the COGS and see if producing more would provide more profit. If more ...
*March 18, 2013*

**Math**

Belmont Records produces DVD records. The fixed costs for producing a record are $160,000, and unit cost amount to 85 cents per record. The revenue is $5 per DVD. (a) How many DVDs must be sold in order to break even? (b) Find the profit or loss if 20,000 DVDs are sold. (c) ...
*March 17, 2013*

**Finite Math**

A Specialty shop owner used a revenue function and a cost-volume function to analyze his monthly sales. one month he found that with a sales volume of 1465 items he had revenues of $32,962.50 and a total cost of $26,405.50. Another month he had total costs of $17,638 on a ...
*March 16, 2013*

**Ms.Sue Help**

two numbers differ by 9.Four times the smaller is 5 more than twice the larger.Find the numbers.
*March 15, 2013*

**Help Please Math**

A principal of $2500 is invested,part at 8% per annum and the rest at 12% per annum. In a year, the 8% investment interest was doubled the 12% investment interest. How much invested at each rate? Express in the form Ax+By=C
*March 15, 2013*