# Posts by Mike

Total # Posts: 3,752

chemistry
In a particular redox reaction, Cr is oxidized to CrO4^2– and Cu2^+ is reduced to Cu^+ . Complete and balance the equation for this reaction in acidic solution. Cr + Cu^2+ ---> CrO4^2-+ Cu^+ i started off by doing this 2 x SO3^2- ---> SO4^2- + 2e 2 x Cu^2+ +2e ---&...

Physics
A sprinter of mass 63.7 kg runs at a constant speed of 10.2 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.8 m.

Physics
You are holding a bulletin board weighing 6.46 N in place against a wall while your friend secures it to the wall. To keep it from slipping, you apply a force perpendicular to the bulletin board, pressing it directly into the wall. How large must this force be if the ...

chemistry
Assume the density of aqueous HCl is the same as water (1.0 g/mL) and use the densities of ethanol (0.789 g/mL) and water as well as the actual amount of recrystallization solvent used to calculate the mass of recrystallization solvent.

Math

physics
Four charges with equal magnitudes of 6.50 x 10-15 C are placed at the corners of a rectangle. The lengths of the sides of the rectangles are 4.07 cm and 5.28 cm. Find the magnitude of the electric field at the center of the rectangle, assuming that three charges have the same...

english
wednesday

Chemistry
A sample of 50.0 mL if sulfuric acid that has a density of 1.84 g/mL would have a mass of how many grams?

Chemistry
Calculate the mass of a quart (946 mL) of mercury. The density of mercury us 13.6 g/mL?

Math
A box contains 3 red marbles, 6 blue marbles, and 1 white marble. The marbles are selected at random, one at a time, and are not replaced. Find the probability. P(red and blue and blue) Please help me

physics
A moving particle encounters an external electric field that decreases its kinetic energy from 9530 eV to 7800 eV as the particle moves from position A to position B. The electric potential at A is -69.0 V, and that at B is +39.0 V. Determine the charge of the particle. ...

physics
An electric car accelerates for 7.2 s by drawing energy from its 430-V battery pack. During this time, 1700 C of charge pass through the battery pack. Find the minimum power rating of the car.

Sammons
how to find the product of 38 and 75?

College Algebra
WHAT WOULD THE SCORE BE AFTER 4 MONTHS

language
idk

intro law enforcement
date 9-22-08 fire in a lawyers office main st, ridgefield ct art work was smashed chairs, papers, and curtains started a fire ( match started it) building is empty over night .5 miles from downtown district 1st fire in a chain from arsonist left a law book on the porch what ...

chemistry
The energy levels the electron can occupy in the Be3+ ion can be calculated using the energy level equation. A Be3+ ion with an electron in the n= 3.00 level emitted a photon with a frequency of 7.30 × 1015 Hz. What is the value of the level n for the new energy?

chemistry
yeah sorry hehe thanks!

chemistry
so it would be 0.96 ?is that right? (8x-393.5)+9(-241.8)+x=5113.3 -5324.2+x=5113.3 x=0.96

chemistry
For a particular isomer of C8H18, the following reaction produces 5113.3 kJ of heat per mole of C8H18(g) consumed, under standard conditions. C8H18(g) + 25/2(O2)(g) -> 8CO2(g) + 9H2O(g) DeltaH= -5113.3 kJ What is the standard enthalpy of formation of this isomer of C8H18(g)?

Center
How is the efficiency of pushing a concrete block up a wooden ramp increased

Science
Job Issues related to overdrawing surface water?

prealgebra
Two consective number of square root of 3

math
A rectangular parking lot is to be constructed on land bordered on one side by an alley. There is 360 ft of fencing to use along the other three sides. What should be the dimensions of the lot if the enclosed area is to be maximum?

Physics
What is the magnitude of the electric field at a point midway between a -5.1 microC and a +6.1 microC charge 10cm apart? Assume no other charges are nearby. What is the direction of the electric field?

Physics
87

Social studies
To write a paragraph explaining Lincoln's vision of the united states. Make at least 2 references to specific details of the Gettysburg address.

math
How do u find the area of a shape size 7 1/4 square

pre-algerbra
A farmer is building a square pen 21 feet on each side. He puts one post at each corner and one post every three feet in between. how many posts will he use. please give equation

Physics
A person lifts a 5.2 kg cement block a vertical distance 1.2 m and then carries the block horizontally a distance 7.3 m. Determine the work done by the person and by the force of gravity in this process.

pre calculus
how to figure out: sec squared x = 1/10

Rational Zeros
DERRRR

trigonometry
find v +u if vector =<6,8>and vector for u + <2,1>

math
i don't know how to calculate

math
James travels 624 miles in 8 hours ona train at a constant rate of speed. How many miles does he travel in 3 hours?

Physics
The scale in Fig. P12 is being pulled on via three ropes. (The force on each rope is F = 180 N.) What net force does the scale read? F 30 Degrees

Physics
The two ropes attached to the hook in the figure below are pulled on with forces of F1 = 150 N and F2 = 300 N. What size single force acting in what direction would produce the same effect? F1 45 Degrees F2 30 Degrees

algebra
use the graph of the function f to find f(-4), f(-3), and f(-2)

math
Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...

mth
A popular new secretary at the law firm of Farnsworth, Newman, O’Malley, Price, and Reynolds, is taken to lunch by a different one of those five men on each of her first week on the job. Each man took her to eat at a different one of these five types of food: Chinese, ...

Math
Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...

MATH
Cereal can be good source of protein.how many quarters cups of cereal are there in 6 1/4

Geomtry
Five fences meet at a point to form angles with measures x, 2x, 3x, 4x, and 5x around the point. Find the measure of each angle.

world history
What helped unite Charlemagne's empire? answer A strong efficient government helped unite Charlemangne's empire

world history
what helped unite charlemagne's empire? Viking attacks

US History
What goes in the first box?

calculus
given f(x)=sqrt(x). find the distance of the point P(2,5) from the line tangent to the functions at x=4.

world history
Who won the battle between the English and the Welsh ? the English right?

calculus
given f(x)=ã(x). find the distance of the point P(2,5) from the line tangent to the functions at x=4.

Physics
Thank you again DRWLS but ref my post "site not working correctly". Still cannot read the answer. Most frustrating. Can I close the adverts? Mike

Physics
I understand there is a relationship between pressure & temperature in a sealed rigid container. An open container is placed in a freezer at -15 degrees C then the door is opened and the cap replaced with the freezer at 1000mb what will the pressure be within the container if ...

Site not working correctly/Physics
I posted a question a couple of days ago which was answered by DRWLS - thank you. Unfortunately I am unable to read the guidance provided as the typing is obscured by the adverts down the right hand side of the page. Look forward to replies. Thanks Mike

Answer: is statement random or discreet? a. Temperature of the coffee served to a randomly chosen customer.

algebra
what is two different word phrases for the expression t-30

Physics

Physics
I understand there is a relationship between temperature & pressure. If a rigid open container was placed in a freezer at -15 degrees C. Removed and its airtight cover replaced simultaneously at 1000mb. What would the pressure be within the container if it was kept in a room ...

Physics
The internal energy of a gas is 900 J. The gas is compressed adiabatically, and its volume decreases by 100 cm3. If the pressure applied on the gas during compression is 1 atm, what is the internal energy of the gas after the adiabatic compression? The answer is 890 J, but I ...

HTML
How do I change the color of the button after a button is pressed in html.

calculus
An object moves in such a manner that its velocity at time t is given by v(t) = t3 - 4t2 +3t At t = 0, it starts at position x = 0. During the interval [0, 4] what is the absolute distance moved?

arithmetic
the sum of the first 8 term of an arithmetic progresion is 220,if the third term is 17.Find the sum of the first 6 items

math
sam chovell is a private detective working in the Bay area. One month he helped the police to solve five mysteries

Explain how to find the value of Y in the following expression 5 Y.6=29

Math
You own a small winery that produces two types of Chardonnay, an extra extra oaky one and an oaky one. The wines are produced from the same grapes. Furthermore, both wines are aged in oak barrels, and have additional oak chips added into the oak barrels. However, the extra ...

Math

Geometry
can you tell us in the diagram which is x and which is y please

Math
i am building a rectangular table top. the perimeter is 22 ft. the area is 24feet squared. what are the dimensions of the tabletop

science
Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...

physics
A block of mass m sliding on a frictionless table is attached to a string that passes through a narrow hole through the center of the table. The block is sliding with speed v0 in a circle of radius r0. (Use any variable or symbol stated above as necessary.) Find angular ...

Statistics
A battery manufacturer is positive that its AA batteries last for 1,000 hours. However, you’re working for Consumer Reports and you don’t agree with what they say about their product. So, you buy 400 batteries and you test them out. Your findings are that the ...

statistics
2)A political candidate is positive that she will get 60% of the vote in an upcoming election. A sample of 100 people is taken, and 52 say that they will they will vote for her. Using a 5% significance level, is the politician right in her claim?

psy.
Equal Status

Math
How many faces, vertices, edges does cone have?

i.p.c
An ostrich runs north in a straight line for 21 meters. She then turns around and runs 25 meters back toward her nest (south) on the same path. What is her displacement?

world history
can you please check my answers 3.In China in the 1980s, commune-based agriculture was replaced by the _______ responsibility system. A. household B. community C. cultural<< D. Confucian _______________________________________ 4. Which of the following statements about ...

CH3CH2CH2CH( a c on top of the ch and a triple bond on top of the c)CH2CH2CH2CH3

Chemistry
CH3CH2CH2CH( a c on top of the ch and a triple bond on top of the c)CH2CH2CH2CH3

Math
Lisa studies for 7 hours for a particular test and got a score of 71, how many hours would she have had to study to get a score of 91?

CHEMISTRY
CH3CH2CH2CH( a c on top of the ch and a triple bond on top of the c)CH2CH2CH2CH3

CHEMISTRY
correction ch3-ch2-ch2-ch(c triple bond CH)-CH2-CH2-CH2-CH3

CHEMISTRY
name this alkyne ch3-ch2-ch2-ch3(cßCH)-CH2-CH2-CH2-CH3 is a heptyne but i just cant figure out the name . Ive tried 1-heptyne but its not the right answer :S help?

world history
What were the 5 major Greek city-states ? Sparta,Athens, Corinth,Argos,Megara Right?

history
1)Who persecuted the Christians first ? -Jews. 2) Who did the Christians persecute? can you help me answer number 2 Thank you

history
What war directly led to the Athenian golden age under the rule of Pericles ? Persian war

I think Ms.Sue is correct, 2 owners, 3 pets each.

history
Who began a savage campaign to overthrow Europe? julius caesar

history
whom did Rome face attacks from ? Germanic people , Carthage . is my answer right?

history
whom did Rome face attacks from ? answer Macedonia, Greece and part of Asia all of them what do you think ?

history
I will say all

history
whom did Rome face attacks from ? answer Macedonia, Greece and part of Asia

history
who did rome destroy and then put salt over the land so nothing would grow again? answer: Carthage

math
How many cubic yards of concrete will it take to fill a cylindrical column that is 24 feet high and whose diameter is 2 feet

Calculus
S=6x^2 is the surface area of a cube. Find the exact change in surface area when x is increased from 6 cm to 6.1 cm . Please Help. It makes no sense.

MATH
HOW DO I FIND THE PRODUCT OF 11/15 AND 12/7

chemistry
A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac the methyl red endpoint...

Chemistry
A 23.596 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 79.504 g of water. A 13.803 g aliquot of this solution is then titrated with 0.1098 M HCl. It required 29.02 ml of the HCl solution to reac the methyl red endpoint...

Maths - Algebra
Boxes are made by cutting 8cm squares from the corners of sheets of cardboard and then folding. The sheets of cardboard are 6cm lnbger than they are wide. width of sheet= x length of sheet = x+6 length of finished box = (x-10) width of finished box = (x-16) volume of the box...

chemistry
What are emission spectra? Is it correct to say . The pattern of spectral emission lines produced by an element.Each element has his own unique emission spectrum. What do you think?

chemistry
Is it correct to say . The pattern of spectral emission lines produced by an element.Each element has his own unique emission spectrum. What do you think?

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