Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 2,696

**Chemistry**

In order for a cell potential to be a standard cell potential, the concentration of all ions in solution must be ________ M, the partial pressures of all gaseous species must be _______ atm, and the temperature must be ________ K. I need help with the blanks.

**Chemistry**

In order for a cell potential to be a standard cell potential, the concentration of all ions in solution must be ________ M, the partial pressures of all gaseous species must be _______ atm, and the temperature must be ________ K. I need help with the blanks.

**chemistry**

for the reaction 3C2H2=> C6H6 at 25 C, the standard enthalpy change is -631 KJ and the standard entropy change is -430 J/K. calculate the standard free energy change at 25 C. show all work!

**chemistry**

what is the most soluble salt of the following set? a) AgCN with Ksp=6.0 x 10^-17 b) Al(OH)3 with Ksp = 1.9x10^-33 c) Fe(OH)3 with Ksp = 2.6 x 10^-39 d) Sn(OH)2 with Ksp = 1.6 x 10^-19

**Chemistry**

What is the molarity of a solution prepared by diluting 25.0 mL of 0.412 M magnesium nitrate to a volume of 1.50 L please help!

**physics**

A 25 g bullet is fired from a gun into a 1.35 kg block of wood initially at rest. (The bullet sticks in the wood). The wood is driven 9.5 m across a horizontal surface with coefficient of friciton 0.25. Find the speed of the bullet just before impact.

**physics**

A 2.5m long pole is balanced vertically on it's tip. If it falls over with it's bottom never slipping. Find the speed of the top end of the pole just before it hits the ground.

**physics**

a uniform ladder of mass m and length l leans against fricitonless wall angle theta. If the coefficient of static friction between the ladder and the ground is u, find the formula for the minimun angle such that the ladder won't slip

**physics**

A star the size of the sun has a mass 8 times as great. It rotates on its axis once every 12 days. It then collapses into a neutron star of radius 10km, losing three quarters of its mass in the process. How long does it take to rotate once after collapse? (it's spere thoug...

**History**

How did the compromises made when writing and ratifying the Constitution encourage the development of political factions? Compare and Contrast the effectiveness of Washington’s and Adams’ presidencies in obeying and promoting the Constitution during their administrat...

**algebra 2**

Evaluate (7+3i) - (-2 -5i)

**Linear equation**

Graph each equation by making a table. Y = 4

**Linear equation**

Graph each equation by making a table. Y = 4

**AAlgebra 1**

Graph each equation by making a table. Y = 4

**Physics**

What is the equivalent resistance of two resistors of 2 ohm and 3 ohm connected in parallel?

**Math**

i think its 5

**Calculus**

use mean value theorem: f(x)= 7- 2^x, [0,4], c=?

**Calculus**

Evaluate the definite integral of the transcendental function. the integral from 0 to 5 of (2^x +8)dx. I got 40+ 31/log(2)but that's wrong.

**statistics**

the average student sends about 200 text messages a day with the standard deviation of 25 texts.(show graph) a.what is the probability that a student sends more than 250 messsages a day? b.what is the probability that student sends less than 150 text messages a day? c.what is ...

**statistics**

The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes.(show graph) B. what is the probabilty that a diver stays under for the less than 53 minutes? c.what is the probabilty that a diver stays under between 25 and 50? d. what is the ...

**statistics**

The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes.(show graph) B. what is the probabilty that a diver stays under for the less than 53 minutes? c.what is the probabilty that a diver stays under between 25 and 50? d. what is the ...

**statistics**

The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes.(show graph) B. what is the probabilty that a diver stays under for the less than 53 minutes? c.what is the probabilty that a diver stays under between 25 and 50? d. what is the ...

**statistics**

The average scuba diver can stay under water for 42 minutes with a standard deviation of 8 minutes, what is the probability that a diver stays under for more than 36 minutes

**geometry**

can a triangle have sides with the given lengths 4in. 4in. 4in.

**math**

Alicia went on a steamboat ride up the Mississippi River. The boat travels 20 miles per hour in still water. How long will it take her to travel 144 miles upstream if the current of the river is 8 miles per hour?

**chamistry**

calculate the pH pOH and (OH(aq)) of 0.006mol/l HI(aq)

**chemistry**

To clean a clogged drain, 26g of sodium hydroxide is added to water to make 150ml of solution. What are the pH and pOH values for the solution?

**trig**

It is 4.7km from Lighthouse A to Port B. The bearing of the port from the lighthouse is N73E. A ship has sailed due west from the port and its bearing from the lighthouse is N31E. How far has the ship sailed from the port?

**7th grade science**

in case you have not figured out the answer yet the answer is D.The bottom layer of the sedimentary rock.

**physics**

A 80kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. He catches the .43kg ball at the peak of his jump, when he is 17.2 inches off the ground. He hits the ground 1.61 inches away from where he leapt. If the ball was moving horizo...

**math**

If exactly 198 people sign up for a charter flight, Leisure World Travel Agency charges $308/person. However, if more than 198 people sign up for the flight (assume this is the case), then each fare is reduced by $1 for each additional person. Hint: Let x denote the number of ...

**grammar**

Is at an article adjective in the sentence, Call me at my office

**Math**

I thought is was written incorrectly on the worksheet; however, I just needed validation, thank you.

**Math**

My number is greater than 10 but less than 70. The number has 2 in the tens place. The number is 10 less than 45. What is my number?

**Statistics**

The average amount of time people spend on facebook each day is 71 minutes, with a standard deviation of 4.7 minutes. Are you more likely to select a random person that spends less than 68 minutes per day, or a group of 35 people that spend on average less than 65 minutes per ...

**physics**

a ball rolls off a 1.7m high desk and lands 1.35m away from the desk. how fast was it rolling?

**trig**

analyze given equation for following characteristics. (amplitude period, phrase shift) y= 3sin (2x-(3.14/2))

**math**

Phillip, the proprietor of a vineyard, estimates that the first 9600 bottles of wine produced this season will fetch a profit of $5 per bottle. However, the profit from each bottle beyond 9600 drops by $0.0002 for each additional bottle sold. Assuming at least 9600 bottles of ...

**Geometry**

y-8= 4/3 x(x+4)

**Physics**

A driver approaches an intersection at a speed of 50km/h, when the light turns amber. The driver applies brakes to get the maximum stopping force without skidding. The car has a mass of 1500kg and the force of static friction between the tires and the road is 1.1*10^4N. Assumi...

**Physics**

A driver approaches an intersection at a speed of 50km/h, when the light turns amber. The driver

**surface area & volume**

Apothem=6sqrt3 side=12 SA=2B+ph SA=748.25+72h is that correct? i just don't understand how to figure out the height..

**surface area & volume**

How can I find the surface area and volume of a hexagonal prism if I don't know the height, only apothem and one side of the base? Thank you!

**chemistry**

You are doing an experiment to determine the Ksp of a salt. If, while filtering, some of the solid passed through the filter and was not taken out before titrating, how would the calculated Ksp and solubility be affected? Thanks.

**Physics**

Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.70 105 Pa and the pipe radius is 2.50 cm. At the higher point located at y = 2.50 m, the pressure is 1.30 105 Pa and the pipe radius is 1.60 cm. (a) Fi...

**Physics**

Water moves through a constricted pipe in steady, ideal flow. At the lower point shown in the figure below, the pressure is 1.70 105 Pa and the pipe radius is 2.50 cm. At the higher point located at y = 2.50 m, the pressure is 1.30 105 Pa and the pipe radius is 1.60 cm. (a) Fi...

**Calculus**

Is pi in the denominator?

**Calculus**

A solid is formed by adjoining two hemispheres to the ends of a right circular cylinder. The total volume of the solid is 2 cubic centimeters. Find the radius of the cylinder that produces the minimum surface area. (Round your answer to three decimal places.)

**calc 1**

Water is leaking out of an inverted conical tank at a rate of 500.000 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8.000 meters and the diameter at the top is 6.500 meters. If the water level is ris...

**physics**

a race car accelerates from rest at +7.2 m/s^2 for 4.5 s. How fast will it be going at the of that time ??

**statistics.. URGENT!! PLZ!!**

In a learning experiment, untrained mice are placed in a maze and the time required for each mouse to exit the maze is recorded. The average time for untrained mice to exit the maze is µ = 50 seconds and the standard deviation of their times is ? = 16 seconds. 64 randoml...

**Physics... URGENT !!!!**

A 66.7-kN car is travelling at 66.5 mph when the driver decides to exit the freeway by going up a ramp. After coasting 418 m along the exit ramp the car\'s speed is 28.9 mph, and it is h = 13.1 m above the freeway. What is the magnitude of the average drag force exerted on...

**physics**

The force of friction between a crate and the floor it is sliding over depends on? a. the speed the crate is moving over the floor with b. the surface area of the crate in contact with the floor c. how much force you are exerting on the crate parallel to the crate's motion...

**Physics **

A space station shaped like a giant wheel has a radius 105 m and a moment of inertia of 5.09 108 kg · m2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1g. When 100 people move to the center of the s...

**Physics**

A 190-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope. What constant force would have to be exerted on the rope to bring the merry-go-round from rest to a...

**chemistry**

A TUMS tablet was dissolved in 110.00 ml of 0.1022 M HCl and analyzed for CaCO3 according to the procedure described in the lab manual. It took 7.48 ml of 0.1005 M NaOH to reach the endpoint. Calculate the mass of CaCO3 in TUMS tablet to the correct number of significant figur...

**AP Psychology**

In comparison to generalized anxiety disorder, panic disorder is characterized by periods of distress that are more intense and more prolonged. less intense and less prolonged. more intense and less prolonged. less intense and more prolonged. unwanted repetitive thoughts and/o...

**Physics**

Monochromatic light of wavelength 550 nm passes through a diffraction grating that has 55000 lines/m. A bright line appears on the screen at an angle of 12.23o from the central bright fringe. What is the order of this bright line? 5 6 7 8

**General Chemistry I**

When a 0.432g sample of a mixture of volatile hydrocarbons is burned in a bomb calorimeter with heat capacity of 3046 J/C, the temperature rises by 7.82C. How much energy (in KJ) is released during combustion. **I got that answered** 3046x7.82C=23819.72J the answer is negative...

**General Chemistry I**

Write the formation reactions. {You Must include the states of matter for each atom or compound} NaClO4(s)

**physics**

Starting from rest, a 75 kg skier slides down a 17.0° slope. If the coefficient of kinetic friction between the skis and snow is 0.120 and it takes 16.9 s to get to the bottom, how long is the ski trail? (Use g = 9.8 m/s2.)

**TRIG HONORS CH: 5.8**

a ship leaves port with a bearing of S 42deg W after traveling 7 miles, the ship turns 90deg and travels on a bearing of N 52deg W for 10 miles at that time, what is the bearing of the ship to the port?

**physics**

A 1500-N uniform boom at = 61.0° to the horizontal is supported by a cable at an angle θ = 29.0° to the horizontal as shown in the figure below. The boom is pivoted at the bottom, and an object of weight w = 2350 N hangs from its top.

**PHYSICS 2**

A horizontal wire that runs east-west carries a steady current to the east. A C-shaped magnet is placed so that the wire runs between the poles, with the north pole above the wire and the south pole below. What direction of the magnetic force on the wire between the poles?

**biology**

If your ears were larger, you would: a. be able to hear sounds at lower amplitude (softer sounds) b. lose the ability to hear low amplitude high frequency sounds c. not experience any difference in your hearing ability d. none of the above

**biology**

When the stereocilia of a hair cell in the inner ear bends, it causes: a. potassium ions to enter the hair cell b. you to hear low frequency sounds c. chloride ions to leave the basilar membrane d. all of the above

**History**

There was a threat of American expansion into British North America. Where were the concern of the Americans expanding too? Why would this area be a prime target?

**Canadian History**

There was a threat of American expansion into British North America. Where were the concern of the Americans expanding too? Why would this area be a prime target?

**physics**

A 4.170 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is μs = 0.505 and the coefficient of kinetic friction is μk = 0.255. At time t = 0, a force F = 12.7 N is applied horizontally to the block. State the fo...

**math**

A (2,-3)b(4,4) C (6,-8) i think these are most likely

**math**

triangle ABC, with vertices A(2,3), B(4,-4), C(6,8), is reflected across the x-axis to form a triangle A'B'C'. Give the new coordinates for triangle A'B'C'.

**Biology**

WHY WOULD PLANT CELLS HAVE 1 LARGE CENTRAL VACUOLE AND NOT SEVERAL SMALL ONES LIKE IN AN ANIMAL CELL?

**Biology**

thanks :)

**Biology**

WHY WOULD PLANT CELLS HAVE 1 LARGE CENTRAL VACUOLE AND NOT SEVERAL SMALL ONES LIKE IN AN ANIMAL CELL?

**Biology**

HOW DOES A CELL WALL HELP WITH “TURGOR PRESSURE?”

**Biology**

WHAT CELL PART AIDS IN MOVEMENT AND INCREASES THE SURFACE AREA?

**Biology**

WHAT ORGANELLE WILL BE USED DURING CELLULAR REPRODUCTION TO HELP ANCHOR THE SPINDLE FIBERS?

**Biology**

Golgi apparatus

**Biology**

WHAT ORGANELLE AIDS IN TRANSPORTING SUBSTANCES?

**Biology**

WHAT ORGANELLE IN THE ANIMAL CELL AIDS IN DIGESTING OLDER CELL PARTS AND WASTES?

**Biology**

WHERE IN AN ANIMAL CELL IS WATER STORED?

**Math**

From a boat on the lake, the angle of elevation to the top of a cliff is 26°35'. If the base of the cliff is 85 feet from the boat, how high is the cliff (to the nearest foot)? A. 56 feet B. 43 feet C. 53 feet D. 46 feet I HAVE BEEN WORKING ON THIS FOREVER! please help...

**I.E.D**

sorry it is just... i don't know her

**I.E.D**

so u want me to FAIL and be a dropout thanks for the inpiration

**chem 111**

the color change at the endpoint should persist for 30 seconds. explain why the time lapse is a good titration technique.

**math**

Compute the number of vinyl tiles, measuring 10 in. each side, needed to tile a kitchen measuring 20ft. by 16ft. _____tiles

**chemistry**

When 1662 J of heat energy is added to 45.9 g of hexane, C6H14, the temperature increases by 16.0 °C. Calculate the molar heat capacity of C6H14.

**Math (Trig)**

In 1893, the city of Chicago put on a World's Fair to celebrate the 400th anniversary of Columbus' trip to the Americas. The most spectacular at this fair was a huge Ferris Week built by an engineer named George Ferris. This remarkable structure had a diameter of 250 f...

**Math**

thank you!

**Math**

I need help understanding truth tables please.

**math**

The weekly demand for the Pulsar 25 color LED television is represented by p, where p denotes the wholesale unit price in dollars and x denotes the quantity demanded. The weekly total cost function associated with manufacturing the Pulsar 25 is given by C(x), where C(x) denote...

**math**

Middletown to star city is 232 miles. Middletown to Rileyville is 136 miles in the same direction. About how far is it Rileyville to Star city to the nearest hundred? How much difference is there between your estimate and the exact number of miles?

**Math**

Middletown to star city is 232 miles. Middletown to Rileyville is 136 miles in the same direction. About how far is it Rileyville to Star city to the nearest hundred? How much difference is there between your estimate and the exact number of miles?

**Calculus**

use the mean value theorem to find the c's on the open interval (a,b) such that fprime(c)= (f(b)-f(a))/(b-a) f(x)= 3xlog(base 2)x , [1,2]

**c**

use the mean value theorem to find the c's on the open interval (a,b) such that fprime(c)= (f(b)-f(a))/(b-a) f(x)= 3xlog(base 2)x , [1,2]

**Physics**

In a Physics laboratory class, an object of mass 2.1 kg, attached by massless strings to two hanging masses, m1= 1.0 kg and m2= 4.0 kg, is free to slide on the surface of the table. the coefficient of kinetic friction between m2 and the table is 0.30. calculate the acceleratio...

**AP Chemistry**

A balloon is filled to a volume of 2.0 102 mL at a temperature of 33.0°C. The balloon is then cooled at constant pressure to a temperature of 1.00 102 K. What is the final volume of the balloon?

**math**

Use properties of logarithms to expand each logarithmic expression as much as possible. Where possible evaluate logarithmic expsressions without using a calculator. logb x^7

**Calculus**

Thank you!!

**Calculus**

yes,i got 7pi/6 and 11pi/6 is that correct?

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