Total # Posts: 86
A weather balloon is inflated to a volume of 26.2 L at a pressure of 755 mmHg and a temperature of 32.5 ∘C. The balloon rises in the atmosphere to an altitude where the pressure is 360. mmHg and the temperature is -13.5 ∘C. Assuming the balloon can freely expand, ...
October 27, 2015
Jenna always throws loose change into a pencil holder on desk and takes it out every 2 weeks. this time it is all nickels and dimes. There are 7 times as many dimes as nickels and the value of the dimes is $6.50 more than the value of the nickels. How many dimes does Jenna have?
April 29, 2015
Numbers that are palindromes read the same forward and backward. For example, 30203 is a five digit palindrome. If a single number is chosen randomly from the set of all three-digit numbers, find the probability that it will be palindromic. Answer 1/10??
April 14, 2015
A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe's diameter is 56.3 cm (0.563 m) and the flow speed of the petroleum is 13.5 m/s. At the refinery the petroleum flows at 5.65 m/s. What is the volume flow rate of the ...
December 10, 2014
An inverted conical tank is 3m tall and 1m in diameter at its widest point. The water is being pumped out of a spout 2m above the top of the tank. Recall that the density of water is = 1000kg/m^3 (a) Find the work needed to empty the tank if it is full. Include units. (b...
May 19, 2014
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&...
July 8, 2013
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 ...
July 8, 2013
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 ...
April 4, 2013
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
December 27, 2012
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
October 27, 2012
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 ...
September 22, 2012
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.
August 27, 2012
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?
March 26, 2012
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 divers speed than the diver would have achieved by performing from a 1 m platform? How ...
March 15, 2012
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?
February 29, 2012
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...
February 29, 2012
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
February 29, 2012
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(...
January 23, 2012
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...
January 23, 2012
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
November 30, 2011
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?
October 18, 2011
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?
August 29, 2011
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 ...
September 22, 2010
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)
August 19, 2010
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)...
August 5, 2010
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 ...
April 9, 2010
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...
March 2, 2010
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
March 2, 2010
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 ...
February 21, 2010
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
February 23, 2009
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).
April 27, 2008
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...
April 21, 2008
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? ...
November 13, 2007
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 ...
November 13, 2007
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???
December 5, 2006