Posts by cris

Total # Posts: 79

Physics
2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the centripetal acceleration of a...

Physics
2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the centripetal acceleration of a...

Physica
2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the centripetal acceleration of a...

math
f(x) = 4x-5 and g(x) = 3x, find (fog)(x)

Inorganic Chemistry
A 1.577 M solution of AgNO3 has a density of 1.220 gram per centimeter cube. What is the molality of the solution?

Inorganic Chemistry
What is the mole fraction of solute in a 1.00 molal solution in which toluene (C7C8) is the solvent.

Inorganic Chemistry
Methyl Alcohol (CH3OH) and ethyl alcohol (C2H5OH) form ideal solutions at 50°C, the vapor pressure of pure methyl alcohol is 0.529 atm, and the vapor pressure of pure ethyl alcohol is 0.292 atm. What is the vapor pressure at 50°C of a solution containing 24.00 g of ...

Inorganic Chemistry
what is the molarity of concentrated hydrogen fluoride if the solution is 48% by mass and has a density of 1.17 gram per milliliter.

math
You are standing beside a merry-go-round that your friend is riding. The merry-go-round is 8m in diameter. Describe how the shape of the sine curve models the distance from you and your friend. Identify the function that will model this situation as well as a function that ...

CHEMISTY
A 25.0 mL sample of perchloric acid solution required 45.3 mL of 0.101 sodium hydroxide solution for complete neutralization. what was the concentration of the perchloric acide solution? work: 0.0453 L NaOH x ( .101 mol NaOH/ 1L NaOH) x (1 mol HClO4/ 1 mol NaOH) x (25.0 mL ...

Language Art
3. c 4. A

social studies
It's b

Geometry
Not trying to find the radius were trying to find the circumference

math
thank you Steve for your help

math
An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2+v_0 t Suppose the object is fired straight upwards with an initial speed of 800ft⁄s, What is ...

math
yes, you're right. the equation is h=-16t^2+v_0t

math
An object is thrown or fired straight upwards at an initial speed of v_0 ft⁄s will reach height h feet after t seconds, where h and t are related to the formula h=-16t^2-v_0 t Suppose the object is fired straight upwards with an initial speed of 800ft⁄s, What is ...

College Chemistry (DrBob222)
Excellent job! Thanks a lot

PHYSICS
A block with a mass of 126 kg is pulled with a horizontal force of F applied across a rough floor. The coefficent of friction between the floor and the block is 0.7. If the block is moving at a constant velocity, what is the magnitude of F applied? F applied =

chemistry
If the ground state is 4S^2 , what is the name of the element

Density Problem
25353

Chemistry
Aluminum carbide, Al2C3 (s), reacts with water to yield aluminum hydroxide, Al(OH)3 (aq), and methane, CH4 (g). Write the equation for the reaction. How many grams of Al4C3 (s) would be needed to prepare 1.000 L of CH4 (g) measured at STP?

math
Joe and his 7 friends share 3 liters of juice how much juice each friend gets

chemistry
supposed we mixed 50.0mL of alcohol w/ enough water to make 400mL solution find the % age by volume of 50L??? what is the answer plz answer my qeustion!!!

Chemistry

statistic
.25

Chemistry
Balance equation c2h3cl + br2

PHYSICS
How much would the rope stretch to break the climber's fall if he free falls 2m before the rope runs out of slack? k=1.40x10^4N//m mass of man= 90 kg I forgot how to use conservation of energy for this. I tried it, but I did it wrong.

physics
How much would the rope stretch to break the climber's fall if he free falls 2m before the rope runs out of slack? k=1.40x10^4N//m mass of man= 90 kg I forgot how to use conservation of energy for this. I tried it, but I did it wrong.

Physics
How do you find the ratio of the new/ old world periods of a pendulum if the pendulum wee transported from earth to the moon, where the acceleration due to gravity is 1.63m/s^2? Im not sure if we use 9.8 at all, I think I'm supposed to use T=2 pi sqrtL/g.

Physics
actually i think that's wrong, i think its only when they collide and one pushes the other. as result they move in the same direction

Physics
so far no one is answering our questions. you should try conservation of momentum: m1v1 + m2v2=(m1+m2)vf then just solve for vf, your final velocity...just a suggestion in case you haven't tried it yet.

physics
I got that far too, but the answer is supposed to be 2.53x10^-3 N. I am not given anything else but the volume.

Chemistry
How do you balance the equation? MnO4^-1(aq) + C2O4^-2(aq)-> Mn^+2(aq) + CO2(g)

quemistry
arrange the following groups of elements in order of increasing ionization energy : a. Be,Mg,Sr. b. Bi,Cs,Ba. c. Na,A1,S

Chem Lab
I don't know how to obtain theoretical yield.

Chem Lab
Aspirin synthesis and Analysis: Calculate theoretical yield of ASA? Used 3.5mL of acetic anhydride and 1.5g of salicylic acid.

Chemistry
A 32.907-g sample of a hydrate of Au (CN)3 contains 5.406 g H2O What is the formula for the hydrate? What is the percent water in this compound? What mass of this hydrate contains 100.0 g H2O?

science
decomposing 0.00153 moles cholesterol will release what volume of hydrogen atoms?

Chemistry
determine the volume of 45mM ethanol needed to make 1700 microliters that has a final ethanol concentration of 26.5mM?

Chemistry
Imagine that you needed to choose an indicator for the titration of a strong base (like NaOH) with a strong acid (like HNO3). You have the indicators in Table 1 available. Which indicator would you choose? Why? Indicator [HIn] [ In] pKa Maryland Red- Red Blue 4.3 Terrapin ...

Spanish help
This is a written assignment. Will someone please help check whether it is grammatically correct. Instructions: Think of where you live in relation to the nearest airport. Write down directions on how to arrive at the airport from your house, using the command form of the ...

math
A homeowner wants to plant a garden in his backyard. He decides to have 375 square feet garden and wants the garden to be 10 feet longer than it is wide. Find the dimensions of the garden.

chemistry
How many moles of sodium hydroxide are produced when 0.155 mole of sodium reacts with excess water?

Statistics
What do you mean "Z" scores in relation to the problem above? sorry, I'm totally confused and overwhelmed

Algebra

Problem Solving
Thanks a lot Steve. Ur an angel.

Problem Solving
John bought a shirt on sale for 25% off the original price and another 25 % off the discounted price. If the final price was \$16, what was the price before the first discount? (Please i need to present it to our school. I don't know how to solve it. Can you post step by ...

Problem Solving
During a storewide sale, a TV which usually sells for \$450 is on sale for \$360. A Stereo which usually sells for \$600 is on sale for \$480. What would be the sale price of a VCR which usually sells for \$500?

Problem Solving
John bought a shirt on sale for 25% off the original price and another 25 % off the discounted price. If the final price was \$16, what was the price before the first discount?

Math
determine the intervals over which the function is increasing, decreasing, or constant f(x)=√x^2-1

Calculus
I'm trying to finish up my pre-cal homework and I am stuck on 2 problems... ***determine the intervals over which the function is increasing, decreasing, or constant*** 32. f(x)=x^2-4x 33. f(x)=√x^2-1 (that's square root of x^2-1) thank you so much for the help =)

chemistry
Calculate the volume needed to dissolve 11.2g CuSO4 to prepare 0.140M?

math
2^9=512 subsets

science
Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, water vapour content Mw=0.015 kg/kg, total pressure Pt=90kpa Please any one can help me>

science
If air at 30 degree c Dry Bulb temp and water vapour content(Mw)=0.015kg/kg flows over a basin containing water at 10 degree C. a) what will happen to the air temp? b) what will happen to the moisture content in the air? c) what will happen to the enthalpy of the air water ...

science
Calculate the specific volume of an air-vapour mixture when the temp=30 degree Celsius, Mw=0.015 kg/kg, Pt=90kpa

Managerial Accounting
Gladmark company produces two types of get well cards scented and regular drivers for the four activities as follows: Scented Regular Inspection hours 40 160 Set up hours 50 50 Machine hours 200 600 Number of moves 225 75 1. Calculate the consumption ratios for the four ...

managerial accounting
Accounting homework Gladmark company produces two types of get well cards scented and regular drivers for the four activities as follows: Scented Regular Inspection hours 40 160 Set up hours 50 50 Machine hours 200 600 Number of moves 225 75 1. Calculate the consumption ratios...

chemistry
Please help me and show me step by step. assume that the reactions are being performed at pressure of 1.2 atm and a temperature of 298K Calcium carbonate decomposes at a high temperature to form carbon dioxide and calcium oxide. How many grams of calcium carbonate will be ...

chemistry
v2xt1/v1=t2 1x298/3.5=85.1k

chemistry
a sample of carbon dioxide gas occupies 3.5 L at 25degrees C. At what temperature will the gas volume be 1 L?

Physics
For anyone who is looking to solve this in the future: First figure out the angle F= 2Tsin(theta)-mg where, F is total force, and here it must be zero to be at equilibrium T=tension of rope (2.7kN) mg=mass*grav= 9.8*74 then use Tan(theta) = Opposite/ Adjacent to figure out the...

how do scientist preserve fossils frozen in ice

Science
how do scientists preserve a fossil frozen in ice

can you help me? my home work fine the identity card and driving licence ,library card ,pasport.

English III
Okay so I am reading the book The Scarlet Letter and it is like really boring, so far. I am about a chapter in and my homework is really hard! I have to read a sentence the packet gives me and interpret the darn thing. It's driving me insane because these things are really...

ciminology
Monday 04/13/09 Need help with this.. based on someone's experience with these procedures. Post a 175- to 350-word response restating the events in the proper order. Answer this question as part of your response: 1.) what sources were the rights afforded this individual ...

math

social studies
did the Dawes reflect and effort by the unites states government to change native American lives? if so how?

something
oh yeah which one heviest element out of the first 5 of family 1, first 4 of family 2, 13, 14, and 18. The first 3 of families 15-17

Scienc
What is the most chemicallyactive nonmetal on the world? i got Chlorine

HHS 265
I NEED HELP WITH THE ASSIGMENT FINACIAL NAD RATIOS IN CLASS hhS 265 i DO NOT COMPREHEND THE MATH

english
You are writing a paragraph on how to make your favorite sandwich. You have a list of the steps beside you, and you write down the steps in sentences, without stopping to check your work. Finally you've written all the steps into sentences, and you put your pen down. Which...

speech
Choose one of the following topic sentences. Write an eight-sentence paragraph that fully develops the topic. A. The number of automobile accidents in my town can be reduced. B. People are moving from the cities to the suburbs in increasing numbers C. Getting along with other ...

Speech
Please help me write an eight sentence paragraph that fully develops the topic. 1. Getting along with other people is important in my work. What exactly does "getting along" involve? What goals would "getting along" help you to meet your work goals? How ...

Speech
Your friend has asked you to write down instructions for installing a kitchen sink. How should you orer the details in a paragraph? Remmeber, you want your friend to be able to easily follow the steps of the process a. spatially b. chronologically c. importance d. comparison ...

Speech
During which step of the writing process should you identify the purpose, medium, and audience for whom you're writing? a. prewriting b.proofreading c. revising d. presenting The last three choice occur essentially after the main aspect of the writing has been done. What ...

Economics
If the full-employment budget shows a deficit of about \$100 billion and the actual budget shows a deficit of about \$150 billion, it can be concluded that there is: a. built-in stability b. a cyclical deficit c. an expansionary fiscal policy d. a contractionary fiscal policy ...

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