Monday

September 22, 2014

September 22, 2014

Total # Posts: 3,995

**Math**

find the derivative f(x)= (2^x-e^x)/(2^x+e^x)
*June 11, 2014*

**Math**

find the derivative F(x)=tan(ln(5x))
*June 11, 2014*

**physics**

he drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one of the following trajectories does the ball ...
*June 8, 2014*

**physics**

Two satellites are orbiting the Earth in stable circular orbits. Satellite A has a mass m and is located at a distance 2r from the center of the Earth. Satellite B has a mass 2m and is located at a distance r from the center of the Earth. Which one of the following statements ...
*June 8, 2014*

**physics**

A box containing supplies is vertically lowered at constant speed by a rope from a hovering helicopter. Consider the following forces that arise in this situation: force 1: the force of the earth pulling on the box force 2: the tension force acting on the box force 3: the ...
*June 8, 2014*

**physics**

The drawing shows a steel ball rolling along a flat surface at constant velocity from point A to point B. A magnet exerts an attractive force on the ball only for the short time that passes as the ball rolls past point B. Which one of the following trajectories does the ball ...
*June 8, 2014*

**Physics**

A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle increases to 2R. The ...
*June 8, 2014*

**Physics**

A model airplane is flying in a horizontal circle with a constant speed. The initial radius of the circle is R. The boy holding the cord to which the airplane is attached, then decides to increase the length of the cord so that the radius of the circle increases to 2R. The ...
*June 8, 2014*

**Math**

0.145258-0.145258x = x
*June 8, 2014*

**physics**

Gradually increase the angle of the incline, but keep the angle low enough that the block does not slide. Select all the phrases below that would make the following statement true: For this situation, as the angle is increased the maximum possible value of the force of static ...
*June 8, 2014*

**physics**

thank you! and the fourth statement?
*June 8, 2014*

**physics**

Joe pushes horizontally on a heavy box across a rough surface at constant speed. Which one of the following statements concerning this situation is false? If Joe stops pushing on the box, the box will stop sliding eventually. If Joe doubles his force on the box, the speed of ...
*June 8, 2014*

**Physics**

A ball is sitting in a child's wagon and a child is holding the wagon's handle. The ball then rolls to the back of the wagon without anyone touching the ball directly. Which of the following statements according to Newton's first law of motion could describe the ...
*June 8, 2014*

**statistics**

What are the differences between hypothesis testing regarding population means drawn from small and large samples
*June 5, 2014*

**civics **

Which of the following correctly describes an example of how climate affected the settlement in North America ? A. most of the United states settled in the Midwest, where temperatures are less extreme. B.Most of Canada's population lives along the southern border, where ...
*June 4, 2014*

**Physics**

i have a question on thin lens equation how do i know when di is positive or negative? also i have an example: A convex lens has a focal length of 60 cm. A candle is placed 50 cm from the lens. What type of image is formed and how far is the image from the lens? (Is my answer ...
*June 3, 2014*

**intro to computers**

A user calls the help desk and says she cannot install a Windows application on her Windows 8 computer because she is being denied. What is the most likely reason?
*May 31, 2014*

**Physics**

A 50kg mass and a 85kg mass are hung over a frictionless pulley what is the acceleration of the system
*May 26, 2014*

**social studies**

Thank you MS. Sue. There were 4 answers with 1 being incorrect and the other 3 checked out correct but I wasn't 100% sure of this one
*May 22, 2014*

**social studies**

Was the city of Constantinople named after the greek city Byzantium? Or was it just built on that former site with a new name?
*May 22, 2014*

**ELA**

is
*May 20, 2014*

**ELA**

Thank you for always helping
*May 20, 2014*

**ELA**

would it be true? voice is a noun right ?
*May 20, 2014*

**ELA**

That's what I thought. Thank you. In this sentence The Gecko is the only lizard with a true voice. Would the subject be Gecko and verb only ?
*May 20, 2014*

**ELA**

In the sentence Some only have two legs and some are legless. What would the subject and verb be ?
*May 20, 2014*

**Physics**

Calculate the equilibrium position of a third charge of 6.79 x 10^-9 C that is positioned between an 8 x 10^-9 C charge and a 12 x 10^-9 c charge.
*May 19, 2014*

**physics**

Calculate the gravity on a planet using a pendulum that has a period of 2.45 s having a length of 1.25 m.
*May 19, 2014*

**English**

What's a good introduction on this topic? Should the Canadian health-care system be privatized?
*May 19, 2014*

**irsc**

Complete the table to determine the balance A for $12,000 invested at rate r for t years, compounded continuously. (Round your answers to the nearest cent.) r = 1.5% find T1-1.2 T10-2.9 T20-8.4 T30-24.3 T40-70.4 T50-203.9
*May 19, 2014*

**Math**

In triangle RST, angle S is a right angle and cdc R=13/12. What is Tan T? answers: 13/5, 12/13, 12/5, 5/12
*May 19, 2014*

**Algebra 1**

-2x-2y=4 2y=-2x-4 Identify the solution
*May 15, 2014*

**physics**

I was able to do part 1 and part 2. I am stuck on Now you perform an X=(0110) measurement on the qubit at time 0. What is the expected value of your measurement? What if you perform the above measurement at time t=4π3 instead? What is the expected value of your measurement?
*May 15, 2014*

**physics**

Consider the observable M that corresponds to a measurement in the sign basis where the measurement value is 3 if the outcome is + and −2 if the outcome is −. Write M in the standard basis. If M is the Hamiltonian acting on a qubit which is in the state |ψ(0...
*May 15, 2014*

**math**

Valerie plays a game using the spinner shown. During the game she will spin a total of 36 times. Which is the best prediction for the number of times she will get either "lose a turn" or "back 3" on the spinner?
*May 14, 2014*

**math**

Which is the best prediction for the number of times the spinner will stop on white?
*May 14, 2014*

**math**

The table shows the results of a spinner with four colored sections. Use the table to answer the question. The spinner is spun 50 more times. Which is the best prediction for the number of times the spinner will stop on white?
*May 14, 2014*

**math**

Three out of 200 machine parts were found to be defective. About how many parts would be expected to be defective out of 2500 parts?
*May 14, 2014*

**math**

Sheila drew single marbles from a bag, recorded the outcome, and replaced the marble. In 50 draws, Sheila drew 20 white marbles and 30 black marbles. What is the experimental probability that the next marble will be black?
*May 14, 2014*

**math/probability**

a deck of cards contains 6 blue, 7 yellow cards, three red cards, and 5 green cards. what is the theoretical probability of drawing a blue card replacing it and drawing a yellow card?
*May 13, 2014*

**math**

Thank you very much MS. SUE
*May 12, 2014*

**math**

is it 380/0.5 =760
*May 12, 2014*

** math**

The fastest car on earth a Thrust SSC would win every NASCAR race in America. If it takes 0.5 hours to travel 380 miles, what is its speed?
*May 12, 2014*

**grammer**

Have you seen my sister Karla around here today?
*May 11, 2014*

**calculus**

Determine whether the given series converges or diverges, and find the sum if it converges. I dont understand, help!! Thnx! 1) 20+5+(5/4)+(5/16)+...
*May 7, 2014*

**physics **

The gravitational field strength at 35700km above earth is .225N/kg. what is the tangental velocity of a 100000kg communication satellite? mass of earth = 5.98E24kg and radius of earth = 6.37E6m
*May 6, 2014*

**physics **

a 2000kg car approaches a 1000m radius curve. If the amount of friction is 1800 N and it have velocity of 30m/sec will the car be able to make the turn?
*May 6, 2014*

**physics**

how fast must a .11kg toy car travel at the top of a loop in toy track not to fall off if the radius of the loop is .15m?
*May 6, 2014*

**science**

Why can an array of smaller interferometers have a better angular resolution than one large interferometer?
*May 6, 2014*

**Chem**

The mass of a golf ball is 45.9g g . If it leaves the tee with a speed of 70.0m/s m/s , what is its corresponding wavelength?
*May 6, 2014*

**Trigonometric Functions**

Given the equation y=3sin(3x-180)-2 state the domain, range, amplitude, period, and phase shift of the cycle.
*April 30, 2014*

**Trigonometric Functions**

The average depth of the water in a port on a tidal river is 4m. At low tide, the depth of the water is 2m. One cycle is completed approximately every 12h. a)Find an equation of the depth, d(t)metres, with respect to the average depth, as a function of the time, t hours, after...
*April 30, 2014*

**physics**

A climber stands on a ledge on one side of a valley. He claps his hands and hears an echo from the opposite side of the valley 1.6 s later. How wide is the valley?
*April 30, 2014*

**trig**

On a typical day at an ocean port, the water has a maximum depth of 18m at 6:00 am. The minimum depth of 9m occurs 6.8 hours later. Write an equation to describe the relationship between the depth and time.
*April 29, 2014*

**algebra**

x5−8x4+28x3−56x2+64x−32=0
*April 27, 2014*

**Math**

A six sided die is tossed. What is the probability that it shows a prime number if you know the following? a. It shows an even number. b. It shows a number less than 5. c. It does not show a 6. d. It shows 1 or 2/ e. It shows an even number less than 4. f. It shows a number ...
*April 24, 2014*

**Physics**

Please explain to me how to do this question!!!!!!! A beam consists of singly ionised neon-20 atoms all travelling at the same speed, 3*10^5 m/s, through a vacuum. As the beam passes through the magnetic field it follows a circular path of radius 0.125m. The force on each of ...
*April 24, 2014*

**physics**

The planet Jupiter has a satellite, Io, which travels in an orbit of radius 4.220×108 m with a period of 1.77 days. Calculate the mass of Jupiter from this information.
*April 23, 2014*

**math**

Reggie knows the length and width of a rectangle. How can he find the perimeter of the rectangle
*April 22, 2014*

**Chemistry-need help ASAP**

again dont know where to start, really just want a step by step so I can do the rest of my homework
*April 14, 2014*

**Chemistry-need help ASAP**

15 ml of 3.0 M NaOH are added to the following: 500.0 ml of pure water 500.0 ml of 0.1 M formic acid 500.0 ml of 0.1 M formate of potassium 500.0 ml of a solution containing 0.1 M formic acid and 0.1 M formate of potassium. Calculate the difference of pH resulting from the ...
*April 14, 2014*

**Chemistry**

i dont even know where to start, I'm really confused on this topic in chemistry, I just want to see at step by step way to solvethis problem.
*April 14, 2014*

**Chemistry **

Titration of 50.0 ml of acetic acid reaches equivalence after delivery of 22.5 ml of standardized NaOH 0.21 M. What is the initial concentration of acetic acid and what is the pH of the solution? What is the pH at equivalence? What is the pH after addition of 20.0 ml of NaOH? ...
*April 14, 2014*

**physics**

A staging that weighs 210 N supports two painters, one 310 N and the other 440 N. The reading in the left scale is Fℓ = 320 N. What is the reading Fr in the right hand scale? Answer in units of N
*April 10, 2014*

**physics**

these are the choices for the answer: Consider the rotational motion of two compact discs (CD). Disc A undergoes a rotation of 540 degrees in 1.50 secs, and disc B undergoes a rotation of π radians in 3.00 secs. a) Angular speed (A) = 4π radians/sec Angular speed (B...
*April 7, 2014*

** reading**

what general statement you make about Babe Didrikson and women athletes?
*April 1, 2014*

**physics113**

Heat can be defined as in phy113
*March 26, 2014*

**phy113**

What mass of ice is needed to cool 60g of water from 43oC to 20oC
*March 26, 2014*

**phy113**

An ungraduated mercury thermometer attached to a millimeter scale reads 22.8 mm in ice and 242mm in steam at standard pressure. What will the millimeter read when the temperature is. 20oC?
*March 26, 2014*

**chemistry**

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent. When 2.50 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 6.43 °C. ...
*March 25, 2014*

**math**

CALCULATE if 1/3of the candles are pink 3/8 are yellow and 1/4 is blue remaining 2 are white
*March 24, 2014*

**Physics**

A doubly charged ion is accelerated to an energy of 33.0 keV by the electric field between two parallel conducting plates separated by 1.70 cm. What is the electric field strength between the plates?
*March 23, 2014*

**Physics**

Two parallel conducting plates are separated by 10.0 cm, and one of them is taken to be at zero volts. (a) What is the electric field strength between them, if the potential 8.50 cm from the zero volt plate (and 1.50 cm from the other) is 540 V? (b) What is the voltage between...
*March 23, 2014*

**PHysiscs**

Four acrobats of mass 83.5 kg, 68.0 kg, 62.0 kg, and 55.0 kg form a human tower, with each acrobat standing on the shoulders of another acrobat. The 83.5-kg acrobat is at the bottom of the tower. (a) What is the normal force acting on the 83.5-kg acrobat?
*March 18, 2014*

**Physics **

A truck with 0.100 m radius tires travels at 24.0 m/s. At how many radians per second are the tires rotating? What is this in rpm?
*March 17, 2014*

**Physics **

An automobile with 0.310 m radius tires travels 85,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?
*March 17, 2014*

**Physics **

In lacrosse, a ball is thrown from a net on the end of a stick by rotating the stick and forearm about the elbow. If the angular velocity of the ball about the elbow joint is 30.0 rad/s and the ball is 1.05 m from the elbow joint, what is the velocity of the ball?
*March 17, 2014*

**Physics **

A basketball player is running at 5.00 m/s directly toward the basket when he jumps into the air to dunk the ball. He maintains his horizontal velocity. (a) What vertical velocity does he need to rise 0.750 meters above the floor? (b) How far from the basket (measured in the ...
*March 17, 2014*

**Physics **

An archer shoots an arrow at a 78.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 34.0 m/s? (Although neglected here, the ...
*March 17, 2014*

**math**

S0rry i meant to say idid this befofe i asked for help. It didnt seem right to me but now the way you did it , i get it
*March 17, 2014*

**math**

THANK YOU . Idid 2000 * 29 / 100 =580
*March 17, 2014*

**math **

In a recent poll of 2000 households, 29% had pets. How many households did not have pets?
*March 17, 2014*

**math**

Thanks i got the same answer in a different way
*March 17, 2014*

**math **

Fabric costs14.00 per yard. If you buy 5 yards or more ,you can get 20% off. how much would 5 yards cost on sale?
*March 17, 2014*

**math **

how do you do 33 1/3% of 200.oo? the 1/3 is throwing me off. Thank you
*March 17, 2014*

**math**

got it . Thank you
*March 15, 2014*

**math **

Pete saved 24.00 of the 60 .oo dollars he earned. What percentage of his earnings did he save ?
*March 15, 2014*

**math**

Thanks everyone for the help
*March 15, 2014*

**math **

John bought 3 of the same shirt and paid 63.00 after the 30% discount.What was the original price of one of the shirts ? Not sure at all how to do this. Thank you
*March 15, 2014*

**math**

how to use a common denominator to write an equivalent fraction for each fraction?
*March 13, 2014*

**math**

I need help on how to use a common denominator to write an equivalent fraction for each fraction?number 1 is 1/2,1/3 and number 2 is 7/8,3/10 please help
*March 13, 2014*

**chem**

what are the type of chemical reactions for the below (synthesis, double/single displacement or decomposition) 2Na+2H2O->2NaOH+H2 2FeS2+3O2->Fe2O2+2SO2 CaCO3->CO2+CaO 2H2S+2KOH->K2S+2HOH 2Ca+4HOH->2Ca(OH)2+H2
*March 12, 2014*

**chemistry**

what is the chemical reactions for these... 2Na+2H2O->2NaOH+H2 2FeS2+3O2->Fe2O2+2SO2 CaCO3->CO2+CaO
*March 12, 2014*

**Chemistry**

how do i name this chemical? S(ClO3)2
*March 12, 2014*

**Chemistry**

how do i name this chemical? Fe(NO3)2
*March 12, 2014*

**chemistry**

i don't know how to write it into a chemical formula
*March 11, 2014*

**chemistry**

i need help with writing nomenclature for the formula and the compounds examples: Sodium bisulphate hydroiodic acid ammonium dihydrogen phosphate Zn(HCrO4)2 Calcium metal ferrous bromide sodium carbide phosphate radical liquid mercury plumbic oxide auric carbonite sodium ...
*March 11, 2014*

**Algebra**

just curious what grade is this math
*March 11, 2014*

**Chemistry check and help**

what is ... Sodium bisulphate hydroiodic acid ammonium dihydrogen phosphate Zn(HCrO4)2 Calcium metal ferrous bromide sodium carbide phosphate radical Check... sodium bicarbonate NaHCO3
*March 11, 2014*

**math studies**

A rhombus has diagonals of lenth 12 cm and 7 cm respectively. Find the larger angle of the rhombus
*March 11, 2014*

**Chemistry**

I am learning the different types of chemical reactions synthesis, decomposition, single displacement, and double displacement I am also learning skeletal equations word equations and balancing the equations I know how to balance equations if I am given the formula in symbols ...
*March 3, 2014*

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