Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 3,850

**math**

Reggie knows the length and width of a rectangle. How can he find the perimeter of the rectangle

**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

**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 add...

**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.

**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? ...

**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

**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)...

** reading**

what general statement you make about Babe Didrikson and women athletes?

**physics113**

Heat can be defined as in phy113

**phy113**

What mass of ice is needed to cool 60g of water from 43oC to 20oC

**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?

**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. Th...

**math**

CALCULATE if 1/3of the candles are pink 3/8 are yellow and 1/4 is blue remaining 2 are white

**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?

**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...

**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?

**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?

**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?

**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?

**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 h...

**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 atmosp...

**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

**math**

THANK YOU . Idid 2000 * 29 / 100 =580

**math **

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

**math**

Thanks i got the same answer in a different way

**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?

**math **

how do you do 33 1/3% of 200.oo? the 1/3 is throwing me off. Thank you

**math**

got it . Thank you

**math **

Pete saved 24.00 of the 60 .oo dollars he earned. What percentage of his earnings did he save ?

**math**

Thanks everyone for the help

**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

**math**

how to use a common denominator to write an equivalent fraction for each fraction?

**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

**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

**chemistry**

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

**Chemistry**

how do i name this chemical? S(ClO3)2

**Chemistry**

how do i name this chemical? Fe(NO3)2

**chemistry**

i don't know how to write it into a chemical formula

**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 hydro...

**Algebra**

just curious what grade is this math

**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

**math studies**

A rhombus has diagonals of lenth 12 cm and 7 cm respectively. Find the larger angle of the rhombus

**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 ...

**cHEMISTRY**

i dont know how to write chemical formulas is it like nomenclature because i need to balance equations (which i know how if the equation is given to me the symbols type but not in words), i need to write skeletal equations but i dont know if they are correct. example: 2H2+O2-&...

**Calculus**

q = f(p) = 10300e^−0.34p a) Find the number of products sold when the price of the product is $5. (Round your answer to the nearest whole number.) Number of products sold: b) Find a formula for the rate of change in the number of products sold when the price is p dollars...

**Physics**

A horse pulls a cart with a force of 180.0 N at and angle of 33.0° with respect to the horizontal and moves along at a speed of 11.0 km/hr. How much work does the horse do in 8.6 min? What is the average power of the horse?

**SCIENCE**

do mass containe capcity

**physics**

A force of 1.24 N pushes against an object with a mass of 0.16 kg for 4.00 min. The object does not move. What is the work done on the object by the force?

**math**

thank you

**math**

sorry i still dont understand .What do i cross multiply?

**math **

A store finds out that 5 out of every 9 customers prefer new extra crunch peanut butter. If the store sells 90,000 jars or regular peanut butter, how many jars of new x crunch should it produce ,and how many of regular should it produce ? Have no idea how to do this. please help

**physics**

A block weighing 71.5 N rests on a plane inclined at 24.1° to the horizontal. The coefficient of the static and kinetic frictions are 0.26 and 0.13 respectively. What is the minimum magnitude of the force F, parallel to the plane, that will prevent the block from slipping?

**chemistry**

How much heat is released when 28.95g of water is frozen?

**math**

A colony of bacteria is growing in a petri dish which has a maximum capacity of 100mg. The mass of bacteria is increasing at a rate given by the logistic equation. Initially there is 2mg of bacteria and the rate of increase is 1mg per day.

**Math**

Mandy scores b points in a basketball game. Jay scores 3 points less than Mandy. Kareem scores 2 times as many points as Mandy. Find the number of points that Jay scores in terms of b.

**Chemistry**

how do i figure out the valences for elements in the transition elements section in the periodic table of elements (i need it for doing nomenclature) and how do i figure out the valences if i don't have the periodic table of elements examples: Zn Cu Ni Co Fe Mn Cr V Ti Sc

**statistics**

Suppose that each unit of a system is up with probability 2/3 and down with probability 1/3. Different units are independent. For each one of the systems shown below, calculate the probability that the whole system is up (that is, that there exists a path from the left end to ...

**Math**

Perimeter of rectangle = 2*l+b. Area = l*b. If l = 1m, b = 55cm. Find area and perimeter

**Chemistry check and help**

so for all the chemical formulas if there is no subscript (for the valency of the element) does it mean it is a one or do i have to find the valency on the periodic table of elements? ex. P02 the P for Phosphorus doesn't have a number does it mean it is a one then ex.SO3 e...

**Chemistry**

so for all the chemical formulas if there is no subscript (for the valency of the element) does it mean it is a one or do i have to find the valency on the periodic table of elements? ex. P02 the P for Phosphorus doesn't have a number does it mean it is a one then ex.SO3 e...

**Chemistry**

i need to write to chemical formula for sulphur(II)iodide but both are non metals what do i do and i get confused sometimes cause i don't know when the metal/non metal gets a one charge (for the valences) ex. NiO =Ni1O2 =Ni2O =Nickel(I)Oxide ex. NiF2 =Ni1F2 =Ni2F =Nickel(I...

**math**

Thank you for working with me on math problems

**math**

So would it be 100 x 8 / 16 =50 lbs ?

**math **

How many pounds of nails will be needed to fill 100 boxes with 8oz. of nails in each?

**Chemistry**

I am supposed to name this using IUPAC method for binary compounds (i think) arsenic(111) sulfide silicon tetraiodide antimony (111)bromide ammonia gas lead(11) and the things in the brackets are supposed to be the roman numerals

**physics**

After falling from rest at a height of 31.5 m, a 0.564 kg ball rebounds upward, reaching a height of 20.2 m. If the contact between ball and ground lasted 1.80 ms, what average force was exerted on the ball?

**physics**

The initial velocity of a 1.55 kg block sliding down a frictionless inclined plane is found to be 1.27 m/s. Then 1.07 s later, it has a velocity of 5.37 m/s. What is the angle of the plane with respect to the horizontal?

**Random**

Why is society unfair?

**math-fractions**

Thank you

**math-fractions**

I have to tell the answer in terms of fractions. My doubt is whether it is 9/12 + 6/12 = 15/12 or 15/24 ?

**math-fractions**

Each band member had 12 tickets to sell, Jamie sold 9 of his tickets Matt sold 6 of his tickets. Using fractions find the total number of tickets sold by Jamie & Matt

**Social Studies**

10. Which of the following was Daniel Webster speaking of when he declared, "Liberty and Union, now and forever, on and inseparable!"? A) regional differences*** B) international differences C) improved transportation D) improved industry Is my answer correct?

**Science**

yeah

**Social Studies**

THANK YOU SO MUCH! THIS HELPS!

**Social Studies**

What did the Monroe Doctrine hope to accomplish?

**Social Studies**

Oh.. umm thanks

**Social Studies**

Is my answer correct?

**Social Studies**

During the early 1800s, the United States tried to make peace with other countries in order to grow and develop. Give an example of one of these peace efforts and briefly explain what it hoped to accomplish. An example of one of the peace efforts was the Missouri Compromise. I...

**Writing**

Thanks! :)

**Writing**

Which sentence is punctuated correctly? (To see that it's italicized, I quoted it in *) A. The article called "A Persistent Rebel" in *American History* magazine told about Elizabeth Blackwell. B. The article called *A Persistent Rebel* in *American History* maga...

**Science**

Which Of the following differs when comparing the deep ocean to the intertidal zone?? A) Need for Energy B) Salinity C) The amount of sunlight* D) Reliance on phytoplankton

**EARTH SCIENCE**

When the water level of a stream or river exceeds its natural banks, it has reached its

**URGENT PHYSICS**

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this force with respect to the...

**English**

Thanks a bunch!! :D

**English**

Which of the sentences below is punctuated correctly? A. "You know," Steven said, "I've never been to the zoo." B. . "You know" Steven said, "I've never been to the zoo." C. "You know," Stephen said, "I've neve...

**math**

The blue line of best fit for boys intersects the vertical axis at 20 inches and the point (12.5, 25). Which equation best describes the boy's line of best fit?

**physics**

A)Eddie the Eagle, British Olympic ski jumper, is attempting his most mediocre jump yet. After leaving the end of the ski ramp, he lands downhill at a point that is displaced 53.0 m horizontally from the edge of the ramp. His velocity just before landing is 26.0 m/s and points...

**algebra**

Determine the equation of g (x) that results from translating the function f(x)=x^2+5 upward 13 units.

**Math**

Two minor league basebal players got a total of 396 hits. Washington has 8 more hits than sanchez. Find the number of hits for each player. Please help!

**Math**

Mr Townes created a 2foot wide garden path around a circular garden. The radius of the garden is 7 feet. He wants to cover the path in stones. If mr. Townes needs 1 bag of stones for every 5 square feet of path, how many bags of stones will he need to cover his garden path?

**Algebra**

A rectangular dog pen has a perimeter of 10 yd and a width of 2yd. What is its area?

**college physics**

To tighten a bolt, you push with a force of 76N at the end of a wrench handle that is 0.26m from the axis of the bolt. What torque are you exerting?

**math**

A ladder is 2 m long. It leans against a wall so that it is 90 cm from the base of the wall. How far up the wall does the ladder reach? Put your answer in m. Round to 3 sig fig.

**Chemistry**

How did you get -.52?

**Chemistry**

Colligative Properties The freezing point of distilled water was determined by recording a thermogram: -0.176 degrees Celsius. The freezing point of a 0.200 m (molality) solution containing an unknown, ionic compound was determined by recording a second thermogram: -.904 degre...

**chemistry**

calculate the percentages by mass of the component element in sodium trioxonitrate(v)

**Chemistry**

The freezing point of a .200m solution: -.904 degrees Celsius.

**Chemistry**

Colligative Properties The freezing point of distilled water was determined by recording a thermogram: -0.176. The freezing point of a 0.200 m (molality) solution containing an unknown, ionic compound was determined by recording a second thermogram. a. Determine the freezing p...

**Physics**

A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto th...

**Physics**

A stationary bicycle is raised off the ground, and its front wheel (m = 1.70 kg) is rotating at an angular velocity of 21.9 rad/s (see the figure). The front brake is then applied for 1.35 s, and the wheel slows down to 4.47 rad/s. Assume that all the mass of the wheel is conc...

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