Thursday

September 29, 2016
Total # Posts: 69

**Trigonometry**

Hello, is there any way to calculate arctan (2) without using calcultor? And what is that way?

*September 19, 2016*

**Calculus**

Hello my problem is the next one: g is a function between the interval (a,b)and "p" is a fixed point in (a,b) that`s mean that g(p)=p. If g can be derivated in that interval and /g(x)/<1 to all the interval. Demonstrate using the Mean value theorem that there is ...

*August 28, 2016*

**algebra**

Let R={(x,y)∈R×R│⟦3x⟧=⟦3y⟧}, where ⟦x⟧ ┤ denotes the greatest integer less than or equal to x. Show that R is an equivalence relation on R. Determine R⁄R .

*June 26, 2016*

**physics**

A Boeing 747 “Jumbo Jet” has a length of 59.7 m. The runway on which the plane lands intersects another runway. The width of the inter- section is 25.0 m. The plane decelerates through the intersection at a rate of 6.1 m/s2 and clears it with a final speed of 45.0 m/...

*April 28, 2016*

**Physics**

Calculate the formula for coefficient of kinetic friction in an inclined plane with a pulley and two masses coonected by a rope. You can only use the weight of the two masses, the height where the second object is and the distance that the first object does and the angle of ...

*April 6, 2016*

**Mathematics**

x and y are positive integers such that 6^x + 2^y + 2 is a perfect square. Find all possible values of x and y.

*February 6, 2015*

**Math**

Proove that: a)2^(1/2) is not rational. b) prove that 2^(1/3) is not rational. I have managed to prove the first part, but i am stuck on the second can someone give me an hint please?

*February 1, 2015*

**Civics**

A text box reads, If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary ... the great difficulty lies in this, you must first enable the government to control the governed, ...

*January 11, 2015*

**Civics**

Ms.Sue can you help with my civics problem?

*January 11, 2015*

**Math**

the row for 4

*November 3, 2014*

**business **

Suppose that Paulie and Vinny each can produce ice cream or t-shirts. it shows the quantity of each good that Paulie and Vinny each can produce in one hour, respectively, if they devote all of their time and effort into making the good. paulie can make 3 ice cream (cups) ...

*September 25, 2014*

**math**

in a Friendship Banquet 2 out of 5 roses are pink. If there are 6 pinks roses, how many total roses are in the banquet?

*September 17, 2014*

**math**

in an apartment building there are 4 tenants who own cats for every 1 tenant who owns fish. if there are 5 tenants who own fish, how many tenants own cats?

*September 17, 2014*

**Chemistry**

The decompostion of dinitrogen pentoxide has been studied in carbon tetrachloride (CCl4) at a certain temperature: 2N2O5→4NO2+O2 [N2O5] Inital rate (M/s) 0.92 ...... 0.95x10^-5 1.23 ...... 1.20x10^-5 1.79 ...... 1.93x10^-5 2.00 ...... 2.10x10^-5 2.21 ...... 2.26x10^-5 ...

*June 24, 2014*

**Math**

How would a company who manufactures “widgets” benefit in using normal distribution?

*April 19, 2014*

**Health**

What type of health hazard could occur by wearing jewelry while preping food?

*April 12, 2014*

**English**

Help! Left my book in my locker and this assignment over George Orwell's novel 1984 are due this monday! My teacher gave us an assignment and the instructions are to find a quote from every chapter in part three and say how it shows Winston's downward spiral either ...

*April 5, 2014*

**math**

Sally needs 6 gallons of water, but she only has a 2 quart pitcher. How many times does she need to fill it up to make 6 gallons?

*February 11, 2014*

**Math**

I have $48. I spend $3 each day. I need to write an equation that represents the amount of money I have left in terms of the number of days since I started spending the money, and tell what each variable in the question represents.

*November 14, 2013*

**physics**

Four long, parallel conductors carry equal currents of I = 9.50 A. The current direction of the current is into the page at points A and B and out of the page at C and D. Calculate the magnitude and direction of the magnetic field at point P, located at the center of the ...

*November 6, 2013*

**chemistry**

Molarity is to moles of solute over liters of solution as molality is to A. molar concentration over molal concentration. B. moles of solute over kilograms of solvent. C. molal concentration over molar concentration. D. moles of solute over moles of solvent.(My answer)

*July 26, 2013*

**bioloy**

Which fraction of the genome contains the most information? Explain.

*March 25, 2013*

**Biology**

The original high estimate of the number of protein-coding genes in humans was based partly on the number of different known proteins made by the human organism. How can the small number of genes now thought to be present account for this larger number of proteins synthesized ...

*March 25, 2013*

**Biology**

Stem height in the pea plant is one of the traits studied by Mendel. The tall allele is dominant to the short stem allele. What is the probability of a tall offspring if two heterozygous plants are mated? What proportion of the tall offspring is likely to be homozygous?

*March 25, 2013*

**Chemistry**

Show the steps necessary to transform acid on left to compound on right... Make sure you use SOCl3.................. (CH3)3CCH2C(=O)OH ----------> (CH3)3CCH2C(=O)OCH2CH=CH2 (CH3)3CCH2C(=O)OH-----------> (CH3)3CHC(=O)N(CH2CH3)2

*November 1, 2012*

**Chemistry**

Show the steps necessary to transform the compound on the left into the acid on the right (CH3)3CCH2BR ------------------>(CH3)3CCH2C(=O)OH

*November 1, 2012*

**Chemistry**

Number these in order of ease of hydrolysis. 1= easiest to hydrolyze 4=hardest to hydrolyze C6H5C(=O)OC66H5 C6H5C(=O)OCl C6H5C TRIPLE BOND N C6H5(=O)NHC6H5

*November 1, 2012*

**Chemistry**

NAME THESE COMPOUNDS a)HOC(=O)CH(OCH3)CH=CHCH3 B)LiOC(=O)C(OCH3)HCH=CHCH3 C)C6H5OC(=O)C(OCH3)HCH=CHCH3 D)CH3CH2NHC(=O)C(OCH3)HCH=CHCH3

*November 1, 2012*

**GEOL 108**

Do you have the answers to exercise 30 in Darrel Hess's Physical Geography Laboratory Manual tenth edition?

*October 18, 2012*

**history**

Which of the following statements about President Andrew Johnson is true? A. He was raised under conditions of extreme poverty B. He was well educated, but he was a poor stump speaker. C. he was impeached and forced from office. D. He defended the planter aristocracy

*October 6, 2012*

**math**

a 45 inch rope is cut into 3 pieces. the first piece of rope is 3 inches longer than the other pieces of rope. what is the length of the longest piece of rope.

*October 3, 2012*

**Physics**

A 2050 kg car rounds a circular turn of radius 18.5 m. If the road is flat and the coefficient of friction between tires and road is 0.680, how fast can the car go without skidding?

*September 30, 2012*

**Physics**

The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.39 rad/s^2. It accelerates for 30.3 s, then maintains a constant angular velocity. Calculate the total angle through which the wheel has turned 69.1 s after it begins rotating.

*September 30, 2012*

**Physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.71 revolutions in 1.29 s before reaching its final angular speed. Calculate its angular acceleration.

*September 30, 2012*

**Physics**

A 0.300 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.215 kg puck that is initially moving along the x axis with a velocity of 2.14 m/s. After the collision, the 0.215 kg puck has a speed of 1.14 m/s at an angle of q = 53.5 deg to the ...

*September 30, 2012*

**physics**

A dentist's drill starts from rest. After 3.62 s of constant angular acceleration it turns at a rate of 2.70E+4 revolutions per minute. Find the drill's angular acceleration. Determine the angle through which the drill rotates during this period.

*September 30, 2012*

**physics**

4. A rat named Littleguy runs in a treadmill (a wire wheel) with a diameter d =8.00 inches. In 5.00 minutes, Littleguy makes the treadmill rotate 2.80 x 10² times. If the rat were running along the ground, how far would he have run? What was his average velocity?

*September 7, 2012*

**math**

anthony is selling mugs . the wholesale price is $2.95. retail price is $5 what is the mark up what percent is that

*May 14, 2012*

**Physics**

what is the moment of interia of a solid cylinder of radius R=0.0950m thickness t=0.015m total mass M=3.565kg? show your work

*October 13, 2011*

**science**

a truck is travelling along a straight road at 72 km/hr.The driver saw a woman crossing and immediately steps on the brake.If the truck stops in 7 sec.what is its acceleration

*October 3, 2011*

**Physics**

At the instant the traffic light turns green, a car that has been waiting at an intersection starts ahead with a constant acceleration of 2.85m/s^2. At the same instant a truck, traveling with a constant speed of 19.0m/s, overtakes and passes the car. A) How far beyond its ...

*July 9, 2011*

**Chemistry**

I got the correct answer by making a simple Initial/Final chart. the initial [Ni^2+] = 1.30, the final [Ni^2+] = 0.500. The change is 0.80 M. This means you would add 0.80 to the initial [Zn^2+] (which is .100 M) and you would get a final [Zn^2+] of 0.90 M. The next step is to...

*April 17, 2011*

**Physics**

The correct answer should be numberphotons*hc/lambda=.93*60*730*3600 because the 93% efficiency applies to the bulb and not the energy per photons.

*March 18, 2011*

**history**

What is the government's role in a traditional economy?

*February 28, 2011*

**PHysics**

A 250 kg load is lifted 23 m vertically with an acceleration a = 0.185g by a single cable Determine the tension of the cable. =2900N Determine the net work done on the load. =? Determine the work done by the cable on the load. =66700 J Determine the work done by gravity on the...

*February 25, 2011*

**Alegebra2**

1. Given f(x)=3^(x-2), simplify f(x+1)-f(x) into an expression of the form (a)(3^x) 2. Given the function f(x)=e^(x) ln x, write the equation(s) for any and all asymptotes. If the graph has no asymptotes, state that fact.

*February 13, 2011*

**Physics**

I've tried both of those. Does not work.

*February 3, 2011*

**Physics**

An elevator (mass 4700 kg) is to be designed so that the maximum acceleration is 6.00×10^-2 g What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?

*February 3, 2011*

**Math**

Use factorization to simplify the given expression in part (a). Then find the indicated limit in part (b). (a) 3x3 + 9x2 + 9x + 3 x4 + x3 + x + 1 (b) lim x → −1 3x3 + 9x2 + 9x + 1 x4 + x3 + x + 1

*January 27, 2011*

**math **

whats the center of the hyperola 25y^2-144x^2+150y-576x-3951=0

*December 29, 2010*

**Math**

I have to make a true statement with this question: {All states west of the Rocky Mountains} {All states west of the Atlantic Ocean} I have to determine if the two statements are: Proper Subset is a subset of is not a subset of proper subset and is a subset of

*August 20, 2010*

**CHEMISTRY (WEBWORK)**

SPARTAN: Enter the numerical energy values (X, Y, & Z) on the y-axis and calculate the Ea and G. (Note: This is a multipart problem. First input your values for X, Y, and Z. When you are satisfied with your values submit them and check the box Go on to next part (When you ...

*July 19, 2010*

**CHEMISTRY (WEBWORK)**

SPARTAN: Answer the follow using the Energy Profile plot. More than one answer is possible for some questions. What chemical species are present... A. at the longest constraint distance? _____ (Use i, ii, iv, etc. for your answer) B. at the highest energy?_____ (Use i, ii, iv...

*July 19, 2010*

**Chemistry (WebWorks)**

a & b are not i

*July 19, 2010*

**CHEMISTRY (WEBWORK)**

ii, iv ????????

*July 17, 2010*

**World History**

how did the scientific and technological revolutions of the 1920s help set the stage for transportation in the United States today?

*May 10, 2010*

**World History**

had no armed forces and the refusal of the United States to join also weakened it

*May 10, 2010*

**math**

pls answer the above

*March 13, 2010*

**Math **

Laverne has sixty-one coins, all of which are dimes and quarters. If the totoal value is $9.85, how many of each kind of coin she has?

*January 13, 2010*

**Math story problem**

well... im not exactly a teacher but, if u subtract 8:15 and 8:27 you will find the time difference

*January 9, 2010*

**chem**

An empty vial has a mass of 56.42 g. If the vial has a mass of 233.13 g when completely filled with liquid mercury (d = 13.53 g/cm3), what is the volume of the vial?

*August 18, 2009*

**science**

Bill finds an unusual object and wishes to calculate it's density. He discovers a problem of accurately weighing it, because it won't stay on the weighing pan. To solve this he adds the object to a beaker containing 59 mL of distilled water and finds the water level ...

*August 18, 2009*

**science**

'Copper' pennies actually contain very little copper. If a penny contains 91.768 % of its total volume zinc and 8.232 % of its total volume copper, what is its density? (d of Cu = 8.95 g/cm3; d of Zn = 7.14 g/cm3.)

*August 18, 2009*

**U.S. History**

At the outset of the secessionist movement in the South, which states defeated the cooperationist argument that the South should act as a unit?

*March 25, 2009*

**algebra 2**

How do I graph this problem??? HELP!!! P = x-4y 3x - y < or equal to 7 2x - y > or equal to 3 y > or equal to x - 3

*September 22, 2008*

**algebra 2**

How do I graph this problem??? HELP!!! P = x-4y 3x - y < or equal to 7 2x - y > or equal to 3 y > or equal to x - 3

*September 22, 2008*

**Stats**

National Packing Materials Company claims its X20 box can hold loads up to at least 80 pounds. Smith Widget Company has been using the boxes for one year and feels the boxes fail at lighter loads. Hearing the complaints from Smith, the lead engineer for National Packaging ...

*September 14, 2008*

**Social Studies**

General Grant's army came closest to defeat in the West as a result of a surprise Confederate attack at the Battle of What?

*April 4, 2008*

**microeconomics - monopoly vs perfect competition**

Monopolistic market operates under the following assumptions: a. there is only one seller b. THE PRODUCT HAS NO CLOSE SUBSTITUTES c. High barriers of entry into the market exists Perfect competition is ruled by competition(there is more than one company competing for sales of ...

*November 8, 2006*

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