Sunday
April 20, 2014

Posts by timmy


Total # Posts: 76

physics
What is the absolute pressure at the bottom of a storage tank of oil 18-m deep that is open to the atmosphere? Take the density of oil to be 800 kg/m3.

Chemistry
A sample of naphthalene (C10H8) that has a mass of 0.7200 g is burned in a bomb calorimeter. The mass of the calorimeter is 1.580 kg, and its specific heat is 2.55 J/(g°C). As a result of the reaction, the temperature of the calorimeter increases from 22.00°C to 29.3&d...

Chemistry
The initial temperature of a bomb calorimeter is 28.50°C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45°C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(g°C), how much heat is absorbed by th...

chemistry
In the reaction between formic acid (HCHO2) and sodium hydroxide, water and sodium formate (NaCHO2) are formed. To determine the heat of reaction, 75.0 mL of 1.07 M HCHO2 was placed in a coffee cup calorimeter at a temperature of 20.8 °C, and 45.0 mL of 1.78 M NaOH, also a...

Math
21 pairs of shoes or 42 shoes

Math
There are 9 boys and 12 girls at a party,everyone is wearing a pair of shoes.How many shoes are there

Writing
What are the five features of a letter.

Math
Fun video rents videos for $1 per video plus chafes a $5 membership fee. Your equation should represent the total cost for renting any number of videos. write an equation Function Table

physics
3 points particles with masses 4kg,2kg,3kg are at the corners of equilateral triangle of side m =2m.

math
i dont know but the question is to circle the object that is heavier(shoe,sock,feather,marble,brick and tape measure)i know a brick,and the tape measure is heavy but i'm not sure about the shoe and the marble

math
is a marble heavy more than 1 pound

AP Chemistry
1.A compound consists of 65.45% C, 5.492% H, and 29.06% O on a mass basis and has a molecular mass of 110 g/mol. Determine the molecular formula of the compound. 2. What is the formula weight of iron (II) sulfate? Answer in units of g/mol. 3. What is the % nitrogen by weight i...

finance math
A car dealer purchased 2 cars, one for $1500 and the other for $20000, He then sold the first car at a loss of 14% and the second car for a profit of 15%. Find the dealer¡¯s profit for the whole transaction and express the answer as a percentage of his total cost.

Physics
A man (80kg) jumps from a 17 storey balcony (51 metres). How long would it take for him reach the ground? ~Sorry for the morbid example, we were just having a chat about it lol

physics
The body in Fig. 10-37 is pivoted at O. Three forces act on it in the directions shown: FA = 13 N at point A, 6.4 m from O; FB = 17 N at point B, 3.6 m from O; and FC = 15 N at point C, 2.2 m from O. Taking the clockwise direction to be negative, what is the net torque about O?

Physics
An Olympic diver performs a dive from the 10 m platform and achieves a speed of 14 m/s just before entering the water. Neglecting air friction, approximately how many times larger the diver’s speed than the diver would have achieved by performing from a 1 m platform? How ...

math
The roof of a building is shaped like a square pyramid, with a base of 18m by 18m. If the slant height of the roof is 12m and roofing costs 5.75m2, how much will it cost for roofing material?

math
The roof of a building is shaped like a square pyramid, with a base of 18m by 18m. If the slant height of the roof is 12m and roofing costs 5.75m2, how much will it cost for roofing material? This is the last question for my homework could u answer this for me to find how much...

Math
A ball has a radius of 56mm a)Calculate the surface area b)what is the volume of the sphere could somebody please answer for my math homework I need help

Math
A cylindrical tin can has a radius of 4.5cm and a height of 5 cm (a)What is the surface area of the can (b)What is its volume? (c)What is the cans capacity could somebody please answer this question so i can get past with math

Organic Chemistry
How many moles of hypochlorous acid are needed to react with 0.621 mol of 9-fluorenol? please help

chemistry
Which of the following equations represents a reaction for which the delta H can be called a standard enthalpy of formation, delta Hf? a) FeO(s) + CO2(g) -> FeCO3(s) b) 1/2 N2(g) + 2 O(g) -> NO2(g) c) 2 Na(s) + Cl2(g) -> 2 NaCl(s) d) Ba(s) + N2(g) + 3 O2(g) -> Ba(N...

chemistry
is it b?

chemistry
65.3?

chemistry
Calculate the value of DHo for the reaction 2 CH4 (g) -> C2H6 (g) + H2 (g) given the following thermochemical equations: C2H2 (g) + H2 (g) -> C2H4 (g) delta = – 175.1 kJ C2H6 (g) -> C2H4 (g) + H2 (g) Delta = + 136.4 kJ C2H2 (g) + 3 H2 (g) -> 2 CH4 (g) Delta = ...

Physics
A tennis player places a 64 kg ball machine on a frictionless surface. The machine fires a 0.051 kg tennis ball horizontally with a velocity of 36 m/s toward the north. What is the final velocity of the machine? Answer in units of m/s

physics
A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. How far down range will he land?

physics
A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. How many seconds will the teacher be in flight?

physics
A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. What is the maximum height the teacher will reach in his flight?

physics
A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. What is the teacher's horizontal velocity?

physics
A student laying on a building 54.0 m high shoots a pellet gun horizontally. If the pellet lands 156 m form the base of the building, what was the muzzle velocity of the gun?

Rounding#'s
use a calculator to find each rounded to 4 decimal places. 1) sec 15.2 degrees 2) an acute angle theta if csctheta= 1.38

Math
A train that is one mile long starts through a tunnel that is also 1 mile long. the train is traveling 15 miles per hour. how long does it take for the train to get completely through the tunnel?

algebra1
how do you figure out this answer.15.6+xforx=-17.9

geometry
Given: M is the midpoint of line segment PQ and line segment RS. Prove: line segment QR is congruent to line segment PS.

Math
12

geometry
Triangle PQR has vertices P(0,12) Q(7,11) ans R(-2,2) Find the eaquation of the triangles median through point Q

geometry
36

math
change ratio to lowest terms.

Hard Calculus
f(x)= xsquared - 2x Determine whether y= f(IxI) is continous at x= 0 justify your answer

Hard Calculus
f(x)= xsquared -2x for y= absolute value of f(x) does the derivitive exist at x=0 and explain why.

AP Physics
first convert 600km/h to m/s then use the equation final velocity suqared = initial velocity squared plus 2 times aceleration times distance. remember initial is 0m/s. Then once you find acceleration use the equation final velocity equals initial velocity plus acceleration tim...

8th grade
A leaky faucet fills a 100 millimeter cup in 10 minutes. 1.how much water is wasted in a day?a week?a non leap year? 2.How long does it take to waste a kiloliter of water? (hint:1 kiloliter=1000000 milliliters)

chemistry
wow didnt think of it that way. thanks a lot =)

chemistry
in a lab experiment to obtain the molar mass of a voltaile liquid, the following data is obtained: volume of flask=225ml mass of flask=77.834gms mass of flask+gas=78.416gms temperature=100 degrees celsius pressure=714 torr What is the molar mass of the liquid? A)11.1 g/mol B)2...

Is anyone here a chemistry genuis?
The formate ion, (CHO2-), is related to the acetate ion and forms ionic salts with many metal ions. Assume that 9.7416 g of M(CHO2)2 (where M represents the atomic symbol for a particular metal) are dissolved in water. When a solution of 0.200 M sodium sulfate is added, a whit...

social studies
hi timmys mom here were trying to figure out this homework assignment... answer to question has secular moderate muslim governments i do not know what secular means to define to timmy for class oral read..i just know the teacher will ask if he knows what such and such are...i&...

social studies
sorry to bother you again what does secular mean

social studies
hello, my homework page starts out with In 1979, muslim fundalists led a successful rebellion against the united states-backed shah of iran and took control of that country? my question is what country? i think the paper printed wrong were doing 1979 fundamentalists thanks

physics
knowns: F=20N h=15m V=25m/s unknowns: max h V1 work-energy theorem: W=K2-K1 K=.5*mV^2 so, m(-g)h=.5mV2^2-.5mV1^2 this simplifies to 2(-g)h=V2^2-V1^2 therefore, V1=sqrt(V2^2+2gh) now all you have to do is plug in numbers. V1=sqrt(25^2+2*9.8*15)=30.32m/s max height is where V=0 ...

math
Bronze cocnsists of 6 parts tin to 19 parts cooper. How amny pounds of tin are there in a 500 lb. bronze statue? What is the formula for getting the answer?

Math
If a mixture requires 2 parts water to 3 parts of alcohol what percentage of mixture is water. How do I work this problem?

equal group riddles
my answer is 25

precal
solve cos(squared)x + sinx = 1 {0, 2pie)

math
40 degrees 60 degrees and 80 degrees

3rd grade
why does a tennis ball go furthur than a beach ball? force and motion question

web 1
what do most virtual encyclopedias require after a trial period

precalculus
find the additive inverse of the number 6- pi and -7

Does this sound ok?
I think you need to work on your grammar skills, missy!

science
how many grams of copper sulfate pentahydrate (CuSO4 5H2o) would you heat to produce 29.8 grams of water?

MATH
What is the area of the region bounded by the lines x=1 and y=0 and the curve y= x-e^x^2? A. 1-e units squared B. e-1 units squared C. (e-1)/2 units squared D. (1-e)/2 units squared or E. e/2 units squared if you can show me how to get that please

English
Thanks

English
Pronoun case for who and whom 23a. Jon Bon Jovi, who is a well-known singer and actor, also owns an arena football team. 23b. Jon Bon Jovi, whom is a well-known singer and actor, also owns an arena Please what is the correct answer? I chose (A).

chemistry
a sample consisting 22.7g of a nongasous unstable compound X is placed inside a metal cylinder with a radius of 8Cm and a piston is carefully placed on the surface of the compound so that for all practical purposes the distance between the bottom of the cylinder and the piston...

Criminal law
"self induced intoxication negates mens rea, hence no crime is committed" justify the statement.

economics
thank you economyst. I have been doing it correctly :) except for industry supply curve as 50q-500. Is that correct?

economics
am i doing this correctly? total output = 1000. output of each firm 20. number of firms 50. ?finding equilibrium price and profits from firms?

economics
perfectly competitive industry. Each firm having identical cost structures. long-run average cost is minimized at an output of 20 units. Minimum average cost is $10 per unit. total market demand is Q=1500-50P. What is the long-run equilibrium price? Total industry output? outp...

microeconomics
yes, subscript i. don't know how to type that here. i don't have my equations with me so i'm still not quite sure how to get the equilibrium and profits? (did i do the other correctly?) There is a lot more for this problem too. I will probably be asking more questi...

microeconomics
perfectly competitive. So horizontal supply schedule?

microeconomics
This is what I have, qi=20, AC(average cost)=10, and (total market demand) Q=1500-50p. What is the industry's long-run supply schedule?

the big idea of energy
I'm also doing the Iron/Sulpher thing. I've gotta make a poster and I need to explain the reaction using the Big Idea of Energy but I don't know what it is can any one help???

the big idea of energy
I'm also doing the Iron/Sulpher thing. I've gotta make a poster and I need to explain the reaction using the Big Idea of Energy but I don't know what it is can any one help???

?
what happens the first time that buck answers the call of the wild? http://www.sparknotes.com/lit/call/ =)

AP chem
So did I!!!!!!

word unscramble
Help me unscramble "laviote"

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