Friday

October 28, 2016
Total # Posts: 3,331

**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

*November 30, 2012*

**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 ...

*November 30, 2012*

**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 ...

*November 30, 2012*

**algebra 2**

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

*November 29, 2012*

**Linear equation**

Graph each equation by making a table. Y = 4

*November 29, 2012*

**Linear equation**

Graph each equation by making a table. Y = 4

*November 29, 2012*

**AAlgebra 1**

Graph each equation by making a table. Y = 4

*November 29, 2012*

**Physics**

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

*November 29, 2012*

**Math**

i think its 5

*November 29, 2012*

**Calculus**

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

*November 28, 2012*

**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.

*November 28, 2012*

**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 ...

*November 26, 2012*

**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 ...

*November 26, 2012*

**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 ...

*November 26, 2012*

**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 ...

*November 26, 2012*

**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

*November 26, 2012*

**geometry**

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

*November 26, 2012*

**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?

*November 26, 2012*

**chamistry**

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

*November 25, 2012*

**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?

*November 25, 2012*

**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?

*November 18, 2012*

**7th grade science**

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

*November 18, 2012*

**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 ...

*November 17, 2012*

**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 ...

*November 15, 2012*

**grammar**

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

*November 15, 2012*

**Math**

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

*November 15, 2012*

**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?

*November 15, 2012*

**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 ...

*November 15, 2012*

**physics**

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

*November 15, 2012*

**trig**

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

*November 15, 2012*

**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 ...

*November 14, 2012*

**Geometry**

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

*November 14, 2012*

**chemistry**

A compound is pure is one spot develops. If the compound is not pure, multiple spots will develop for each compound in the mixture.

*November 13, 2012*

**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. ...

*November 12, 2012*

**Physics**

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

*November 12, 2012*

**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..

*November 12, 2012*

**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!

*November 12, 2012*

**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.

*November 11, 2012*

**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) ...

*November 9, 2012*

**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) ...

*November 9, 2012*

**Calculus**

Is pi in the denominator?

*November 7, 2012*

**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.)

*November 7, 2012*

**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 ...

*November 6, 2012*

**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 ??

*November 6, 2012*

**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 ...

*November 6, 2012*

**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...

*November 6, 2012*

**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...

*November 2, 2012*

**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 ...

*November 1, 2012*

**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 ...

*November 1, 2012*

**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 ...

*October 31, 2012*

**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/...

*October 31, 2012*

**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

*October 31, 2012*

**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...

*October 31, 2012*

**General Chemistry I**

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

*October 31, 2012*

**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.)

*October 30, 2012*

**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?

*October 29, 2012*

**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.

*October 29, 2012*

**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?

*October 28, 2012*

**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

*October 27, 2012*

**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

*October 27, 2012*

**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?

*October 26, 2012*

**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?

*October 26, 2012*

**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 ...

*October 25, 2012*

**Health**

D. none of the above are correct

*October 25, 2012*

**math**

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

*October 24, 2012*

**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'.

*October 24, 2012*

**Biology**

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

*October 23, 2012*

**Biology**

thanks :)

*October 23, 2012*

**Biology**

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

*October 23, 2012*

**Biology**

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

*October 23, 2012*

**Biology**

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

*October 23, 2012*

**Biology**

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

*October 23, 2012*

**Biology**

Golgi apparatus

*October 23, 2012*

**Biology**

WHAT ORGANELLE AIDS IN TRANSPORTING SUBSTANCES?

*October 23, 2012*

**Biology**

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

*October 23, 2012*

**Biology**

WHERE IN AN ANIMAL CELL IS WATER STORED?

*October 23, 2012*

**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...

*October 23, 2012*

**I.E.D**

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

*October 23, 2012*

**I.E.D**

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

*October 23, 2012*

**chem 111**

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

*October 23, 2012*

**math**

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

*October 23, 2012*

**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.

*October 20, 2012*

**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 ...

*October 20, 2012*

**Math**

thank you!

*October 19, 2012*

**Math**

I need help understanding truth tables please.

*October 19, 2012*

**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) ...

*October 19, 2012*

**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?

*October 18, 2012*

**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?

*October 18, 2012*

**math**

The correct awnser is 56 oz. Because if u divide 9 and 63 it will be 7 then if u multiply 8x7 equals 56oz.

*October 17, 2012*

**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]

*October 17, 2012*

**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]

*October 17, 2012*

**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 ...

*October 15, 2012*

**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?

*October 15, 2012*

**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

*October 15, 2012*

**Calculus**

Thank you!!

*October 15, 2012*

**Calculus**

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

*October 15, 2012*

**Calculus**

f(theta)= 4sec(theta)+ 2tan(theta), 0 less than theta less than 2pi. find all critical numbers

*October 15, 2012*

**Science**

How would you prepare 10 mL of 0.08 M NaCl in sodium acetate buffer? (Stock Sodium acetate buffer: 0.1 M)

*October 14, 2012*

**literature**

In what way does the setting of a small town during the Great Depression impact the characters and plot of "Gumption"? a. The characters can use their wealth to choose among many options for resolving conflicts. b. The characters are unconcerned about the way they ...

*October 12, 2012*

**Math (algebra)**

3$ *

*October 12, 2012*