Friday

November 28, 2014

November 28, 2014

Total # Posts: 2,854

**physics**

The velocity of the transverse waves produced by an earthquake is 8.9 km/s, and that of the longitudinal waves is 5.1 km/s. A seismograph records the arrival of the transverse waves 68 s before the arrival of the longitudinal waves. How far away was the earthquake?
*November 26, 2011*

**physics**

11 newtons
*November 25, 2011*

**college math**

a license plate is to consist of three digits followed by two uppercase letters. determine the number of different license plates possible. the first digit cannot be zero and repition is not permitted.
*November 22, 2011*

**chemistry**

How much of the water (in grams or mL) is consumed to produce 15 mL of the H2 gas
*November 22, 2011*

**Algebra II**

The intensity of illumination at a given point is directly proportional to the intensity of the light source and inversely proportional to the square of the distance from the light source. If a desk is properly illuminated by a 74.0 w lamp 8.00 ft from the desk, what size lamp...
*November 22, 2011*

**Algebra II**

The volume of a given weight of gas varies directly as its absolute temperature t and inversely as its pressure p. If the volume is 4.45 m^3 when p=225 kilo pascals (kpa) and t = 305 K, find the volumn when p = 325 kpa and t = 354 k.
*November 22, 2011*

**Algebra II**

The amount paid to a work crew varies jointly as the number of persons working and the length of time worked. If 5 workers earn $5123.73 in 3.0 weeks, in how many weeks will 6 workers earn a total of $6148.48?
*November 22, 2011*

**Algebra II**

The maximum safe load of a rectangle beam varies jointly as its width and the square of its depth and inversely as the length of the beam. If a beam 8.00 in. wide, 11.5 in. Deep, and 16.0 ft long can safely support 15.000 lb, find the safe load for a beam 6.50 in. Wide, 13.4 ...
*November 22, 2011*

**Algebra II**

The maximum safe load of a rectangle beam varies jointly as its width and the square of its depth and inversely as the length of the beam. If a beam 8.00 in. wide, 11.5 in. Deep, and 16.0 ft long can safely support 15.000 lb, find the safe load for a beam 6.50 in. Wide, 13.4 ...
*November 22, 2011*

**Algebra II**

The kinetic energy of a moving body is directly proportional to its mass and the square of its speed. If the mass of a bullet is halved, by what factor must its speed be increased to have the same kinetic energy as before?
*November 22, 2011*

**Algebra II**

If y varies jointly as w and x, and y is 483 when x is 742 and w is 383, find y when x is 274 and w is 756.
*November 22, 2011*

**Algebra II**

The area of a triangle varies jointly as its base and altitude. By what percent will the area change if the base is increased by 15% and the altitude decreased by 25%?
*November 21, 2011*

**Algebra II**

If 750 m of 3.00-mm-diameter wire has a resistance of 27.6, what length of similar wire 5.00 mm in diameter will have the same resistance?
*November 21, 2011*

**Algebra II**

If both masses are increased by 60% and the distance between them is halved, by what percent will the force of attraction increase?
*November 21, 2011*

**Linear Programming**

Riverside oil company in eastern Kentucky produces 3 different grades of gasoline. They are regular, premium, and supreme grades. Each barrel of regular grade sells for $77 while premium grade sells for $82 per barrel and supreme grade sells for $89 per barrel. Petroleum ...
*November 17, 2011*

**statistics/psych**

Find TWO media examples of two types of correlations (explained below). You will have to do some research to find these. Next: (1) Find one media example (don�t make up your own) of a correlation that could be argued to be spurious (third variable). Explain your media ...
*November 16, 2011*

**statistics/psyc**

Researchers are interested in the effectiveness of a particular treatment for insomnia. Fifty insomnia sufferers who responded to a newspaper ad are contacted, and each is given a pill with instructions to take it before going to sleep that night. The pill actually contains ...
*November 16, 2011*

**statistics**

2.5
*November 16, 2011*

**geometry**

find x if m<2=9x+3 and m<DBC=21x-3
*November 15, 2011*

**chemistry**

I need to find out Molar solubility of CuS. How many grams of CuS are present in 15.0 L of a saturated CuS solution,
*November 14, 2011*

**chemistry**

Thanks Dr Bob The Ksp = 4.96 x 10^-9, so the second one I was using was the correct one, Reaching the M wasn't the hard part But I am still not sure of the equation. I will ask my teacher today in class. Somehow I came up with 52.133L but I did not factor the H2O in there ...
*November 14, 2011*

**chemistry**

Thank you Dr Bob!! I was thinking most of the same that you said, even about the 1:1 ratio, and my book had most of the actual compounds stated about being insoluble IN WATER. I was just was trying to figure it all out and make sense of the values and the insoluble compounds, ...
*November 13, 2011*

**chemistry**

what one is the Most Soluble compound 1) CuS, Ksp = 1.27 x10^-36 2) PbS, Ksp = 9.04 x 10^-29 3) AgCl,Ksp = 1.77 X 10^-10 4) AgI, Ksp = 8.51 x 10^17 5) Not enough information. My book states that AgCl is insoluble in water and so are MOST phosphates and Sufides, and I am ...
*November 13, 2011*

**Please Help!!!!!!**

a hot air balloon is rising vertically 10 ft/sec while the wind is blowing horizontally 5ft/sec. Find the speed of the balloon and the angle x that it makes with the horizontal. I know that the speed of the balloon is the square root of (10)^2 + (5)^2, but I was wondering if ...
*November 10, 2011*

**reading**

Is flying, cried, clapped, try, shook are consonant clusteres
*November 9, 2011*

**Calculus**

Consider f(x)=200+8x^3+x^4. find the intervals on which function is increasing or decreasing, the local max and minimu values, the intervals of concavity and the inflection points
*November 9, 2011*

**Math**

How long will it take 7500 to triple itself if it is invested at 7% simple interest?
*November 9, 2011*

**physics**

Suppose you increase your walking speed from 1m/s to 3m/s in a period of 1s. What is your acceleration? a:2m/s b:5m/s c:4m/s d:3m/s
*November 9, 2011*

**Please Help!!!!!!**

From the top of a lighthouse 55ft above sea level, the angle of depression to a small boat is 11.3 degrees. How far from the foot of the lighthouse is the boat?
*November 8, 2011*

**Science**

If you mix 40.0 grams of Cu with 50.0ml of 1.20 M HNO3 solution, how many grams of NO gas can be made?
*November 7, 2011*

**General Chemistry **

Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Indicate if the volume of NaOH is before or after the equivalence point. Compare these theoretical values with the actual values found on the titration ...
*November 6, 2011*

**Physical Science **

DISTANCE-TIME for RUNNERS Time(s) 1 2 3 4 Sally's Distance(m) 2 4 6 8 Alonzo's Distance(m) 1 2 2 4 Make a distance-time graph that shows the motion of both runners. What is the average speed of each runner? Which runner stops briefly? Over what time interval do they ...
*November 3, 2011*

**chemistry**

How much heat is absorbed by the calorimeter if the temperature change is 10 C and the calorimeter constant (Heat Capacity) is 3.3 J/K?
*November 3, 2011*

**Chemistry**

9. Iron is produced by reducing iron(III) oxide with CO: Fe2O3 + 3 CO → 2 Fe + 3 CO2 ∆H = –23 kJ . How much heat is produced when 1.00 kg of Fe2O3 are reduced?
*November 3, 2011*

**Physics**

A 3.2 kg block with a speed of 11 m/s collides with a 11 kg block that has a speed of 3.3 m/s in the same direction. After the collision, the 3.2 kg block is observed to be traveling in the original direction with a speed of 6.4 m/s. (a) What is the velocity of the 11 kg block...
*November 1, 2011*

**Physics **

The masses usually cancel out of equations, so I'm just guessing that that's what happens here. I just don't know how to start it.
*November 1, 2011*

**Physics **

That's all the information that I'm given.
*November 1, 2011*

**Physics **

Block 1, with mass m1 and speed 4.5 m/s, slides along an x axis on a frictionless floor and then undergoes a one-dimensional elastic collision with stationary block 2, with mass m2 = 0.41m1. The two blocks then slide into a region where the coefficient of kinetic friction is 0...
*November 1, 2011*

**External diploma program**

Im looking for 2 formally organized groups they each have to have a affect on one another cooperatively
*October 30, 2011*

**probability**

A jar is filled with nickels and pennies. The value of the nickels is $S and the value of the pennies is $r. If you picked a hundred coins, what is your expected outcome?
*October 30, 2011*

**General Chem lab**

Hi, how do I calculate how many grams of unknown diprotic acid are needed to make 150mL of 0.750N (normal) solution? and to make 125mL of 0.500M (molar) solution? we have 0.5000M of NaOH.. Please help me...
*October 30, 2011*

**physics**

Two wooden crates with masses are as shown are tied together by a horizontal cord. Another cord is tied to the first crate and it is pulled with a force of 199N at a angle of 20.0 degrees. Each crate has a coefficient of kinetic friction of 0.55 . Find the tension in the ropes...
*October 27, 2011*

**General Chemistry **

How do I calculate the concentration of KmNO4 when.. Initial Volume is 50mL 0.11g sodium oxalate Volume of KMnO4 used to titrate oxalate and acid= 34.0 mL Volume of KMnO4 used to titrate acid only= 0.10 mL Please help me Thank you!
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**organic chemistry**

what would be the result if we heated a mixture of dicholoromethane and naphalene to 60 degrees celcius, collected distillate until no further material is distilled, and then cooled the flask back to room temperature?
*October 26, 2011*

**FRENCH**

kk thanks a lot :):):):):):):):):):):):):):):):):)::):):):):):):):):):):):):):):):)
*October 25, 2011*

**FRENCH**

what do these words in french mean . pleese translate: chez moi une cassette de jazz un boite i did al my other questions but i dont get these
*October 25, 2011*

**SS**

Whos is famous for the quote Ask not what your country can do for you, but what you can do for it?
*October 25, 2011*

**math**

Find the greatest possible length of a rope which can be used to measure exactly the lengths 7m, 3m 85cm and 12m 95cm.
*October 25, 2011*

**history**

The Anti-Federalists _____.
*October 25, 2011*

**math**

what digit is in the tens place in 32? what digit is in the ones place in 32?
*October 24, 2011*

**MATH**

10 2/9 - 3 17/18
*October 23, 2011*

**Math**

The trail is 2989 miles long. It begins in City A and ends in City B. Manfred has hiked 2/7 of the trail before. How many miles has he hiked?
*October 23, 2011*

**Math**

a rectangular laboratory tray is 1/3 feet by 5/4 feet. Find the area
*October 23, 2011*

**PHYSICS**

An object is placed on an incline with friction. The incline is slowly raised from a zero degrees and at 29.2 degrees, the object begins to slide down the incline. The incline is then raised to 40.5 degrees and the object is placed back on the incline. The coefficient of ...
*October 21, 2011*

**COMM 215**

Please guide me on what I have done incorrectly: Part I: True or False 1. The following word group is a FRAGMENT: That movie, one of my favorites. X True __False 2. The following word group is a FRAGMENT: The local baseball team, needing a good pitcher most of all. X True ...
*October 20, 2011*

**Comm 215**

The original:(make parallel) To succeed in the new economy, workers will have to learn throughout their careers, adapt to changing circumstances, and self-motivation will be needed.
*October 20, 2011*

**Comm 215**

Is this correct 49. To succeed in the new economy, workers will have to learn throughout their careers, adapt to changing circumstances, and have self-motivation.
*October 20, 2011*

**math**

why 13 is odd number. what is defination of odd and even numbers
*October 19, 2011*

**statistics**

Smith is a weld inspector at a shipyard. He know from keeping track of good and substandard welds that for the afternoon shift 5% of all welds done will be at substandard. Smith checks 7500 shifts completed that shift and finds that 300 of them are substandard. Find the sample...
*October 17, 2011*

**Accounting**

Prepare the entry to record the accrued interest and the amortization of premium on December 31, 2010 using the straight-line method. INFO: Sharapove Co common stock, $100 par 200 shares $37,400 U.S. government bonds, 11%, due 4/1/2020, interest payable 4/1 & 10/...
*October 16, 2011*

**physics**

A golfer takes two putts to get his ball into the hole once he is on the green. The first putt displaces the ball 6.90 m east, the second 7.70 m south. What displacement would have been needed to get the ball into the hole on the first putt?
*October 13, 2011*

**Math**

If something is less than five what will be rounding for that number for example 43, 44, 42
*October 12, 2011*

**math**

explain how u round 85 to nearest ten.
*October 12, 2011*

**Math**

what is rule of rounding a number.
*October 12, 2011*

**Math**

write an addition problem that requires regrouping
*October 12, 2011*

**physics**

A 75.0-W lamp is placed in series with a resistor and a 120.0-V source. If the voltage across the lamp is 24 V, what is the resistance R of the resistor?
*October 11, 2011*

**physics**

A golf ball is hit with an initial velocity of 50 m/s at an angle of 45° above the horizontal. How far will the ball travel horizontally before it hits the ground?
*October 11, 2011*

**Reading**

what is base word for calling, called, calls. what is the base word for burning, burned, burns
*October 10, 2011*

**Reading**

what is base word for calling, called, calls what is base word for burning, burned, burns
*October 10, 2011*

**Reading**

what is base word.
*October 10, 2011*

**math**

How you can rounded 85 to the nearest ten.
*October 10, 2011*

**Chemistry**

Do chemists speed a reaction by using bunsen burners or steam baths because this lowers the activation barrier?
*October 9, 2011*

**CHEMISTRY**

Why must an organic layer be washed with NaOH?
*October 9, 2011*

**geometry**

how do you justify if three lenghs make a triangle?
*October 8, 2011*

**Business Law**

Sam owns an acre of land on Red River. The government dams the river. A lake forms behind the dam, covering Sam's land. Does the government owe Sam anything? I dont want you to give me the answer but maybe just a reference where I could see the law on this case
*October 8, 2011*

**Finance**

99250
*October 6, 2011*

**physics**

A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72 Newtons pushes to the left (negative x direction) with a force of 72 Newtons. Another force of unknown magnitude pushes the mass in a direction of 21.4 degrees above the positive x axis. The mass is ...
*October 6, 2011*

**physics**

A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72 Newtons pushes to the left (negative x direction) with a force of 72 Newtons. Another force of unknown magnitude pushes the mass in a direction of 21.4 degrees above the positive x axis. The mass is ...
*October 6, 2011*

**Pre-Calculus**

It'll help you sove this if you draw a picture.(Not the greatest below but you get the idea) .| . | . | . |x . | ._____________| 25ft The 32 degrees should go in the bottom left corner of the triangle. To solve for x, you would use tangent. The problem would be set up as ...
*October 5, 2011*

**Calculus**

Find the equation of the tangent line to the curve below at point (0,3) y=6/(1+e^-x)
*October 5, 2011*

**6th grade english**

I need help to do adverbs please come and help me on this please anybody.
*October 4, 2011*

**Math**

regroup 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
*October 4, 2011*

**Latin. **

I don't know if I need to put them in singular or plural. that's what making me confused. I'm doing the 3rd declension
*October 4, 2011*

**Latin.**

The 3rd delension What's the accusative case for 1. magna urbs 2. rex fortis 3. navis longa 4. matres laetae 5. omnes puellae what's the ablative case for 1. bonus rex 2. puer fortis 3. omnes comites 4. princeps tristis 5. urbes multae
*October 4, 2011*

**Lati**

What's the accusative case for 1. magna urbs 2. rex fortis 3. navis longa 4. matres laetae 5. omnes puellae
*October 4, 2011*

**physics**

Identical +1.39 µC charges are fixed to adjacent corners of a square. What charge (magnitude and algebraic sign) should be fixed to one of the empty corners, so that the total electric potential at the remaining empty corner is 0 V?
*October 4, 2011*

**Math**

regroup 2 tens, 2 ones; 1 ten, 12 ones Name the word that describes what was done to show the number in different ways.
*October 4, 2011*

**geometry**

Given a line l, let A be a point on l, and B another point not on l. a. prove all the points of the line segment AB, except for A lie on the same side as B.
*October 4, 2011*

**Calculus**

is there a number a such that the lim x->2 6x^2+ax+a+57/x^+x-6 exists? if so find the value of a and the limit.
*October 3, 2011*

**Science - Chemistry**

A certain elixir is 92 proof. A proof is twice the volume percentage of alcohol in a blend. Ethanol's structural formula is CH3CH2OH with a molar mass of 46 grams/mole. The density is .79 g/ml. How many liters of elixir must one have in order to have 50 moles of carbon?
*September 29, 2011*

**physics**

a European farm has a land area of 0.425km^2. determine this area in acres . 1.000 acre =43,560ft ^2
*September 27, 2011*

**writing decimals**

How do you write 0.013 in expanded notation
*September 27, 2011*

**math**

23.6 repeating in fraction notation
*September 26, 2011*

**math**

23.6repeating find fraction notation
*September 26, 2011*

**math**

23.6 repeating find fraction notation
*September 26, 2011*

**chem**

an aluminum engine block has a volume of 4.77 L and mass of 12.88 kg. whate is the density of aluminum in g/cm 3
*September 24, 2011*

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