Monday
October 20, 2014

Posts by emily


Total # Posts: 2,341

physics
Two pipes, equal in length, are each open at one end. Each has a fundamental frequency of 475 Hz at 297 K. In one pipe the air temperature is increased to 304 K. If the two pipes are sounded together, what beat frequency results?
December 7, 2012

8th grade math
1/3 for Seth. The ratio is 3:2:1
December 7, 2012

spanish
Can someone please proof-read what I have so far on my Spanish essay for finals? Here it is so far: Antes de ver al aeropuerto, es importante confirmer el vuelo. Haces la maleta con ropa para tus vacacion. Cuando llegas el areopuerto, recibes la tareta de embarque y ver a ...
December 6, 2012

Economics
The answer is D. It revolves around the family unit.
December 6, 2012

General Chemistry I
Never mind, I just found my error; I incorrectly converted between Torr and atm, I should've gotten 1.05 atm instead.
December 3, 2012

General Chemistry I
And according to this solution I have here the correct answer is b. 1,250 mL~
December 3, 2012

General Chemistry I
A sample of gas occupies a volume of 59.9 mL. As it expands, it does 126.2 J of work on its surroundings at a constant pressure of 798 torr. What is the final volume of the gas? a. 61.1 mL b. 1,250 mL c. 218 mL d. 1,490 mL e. None of the above I used the work function w = -P&#...
December 3, 2012

General Chemistry I
Thank you so much, this makes much more sense than what I was doing; I was dividing each amount by the number of moles of O, not Br, which explains why I was getting crazy numbers.
December 3, 2012

General Chemistry I
A sample of a compound containing only Br and O reacts with an excess of H2 to give 6.601 g of HBr and 3.919 g of H2O. What is the empirical formula of this compound? a. BrO b. BrO2 c. Br2O d. BrO3 e. None of the above I already know the answer is (e), but I am not entirely ...
December 3, 2012

ap chemistry
A calorimeter contains 20.0 of water at 12.5 . When 2.20 of (a substance with a molar mass of 59.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.5 . Calculate the enthalpy change, , for this reaction per mole of . Assume that the...
December 3, 2012

Physics
Use 5.98 × 10 24 kg as the mass of the Earth. A 2350 kg meteorite has a speed of 143 m/s just before colliding head-on with the Earth. Determine the recoil speed of the Earth. Answer in units of m/s
December 2, 2012

Physics
Note: Take East as the positive direction. A(n) 86 kg fisherman jumps from a dock into a 131 kg rowboat at rest on the West side of the dock. If the velocity of the fisherman is 5.2 m/s to the West as he leaves the dock, what is the final velocity of the &#...
December 2, 2012

physics
A 67.3 kg ice skater moving to the right with a velocity of 2.52 m/s throws a 0.151 kg snowball to the right with a velocity of 33.7 m/s relative to the ground. What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the skates and ...
December 2, 2012

physics
A 2.24 kg mass on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 4.45 N/m. The mass is displaced 3.06 m to the right from its equilibrium position and then released, which initiates simple harmonic motion. How many times ...
December 2, 2012

Physics
A 83.5 kg astronaut is working on the engines of a spaceship that is drifting through space with a constant velocity. The astronaut turns away to look at Earth and several seconds later is 35.5 m behind the ship, at rest relative to the spaceship. The only way to return to the...
December 2, 2012

Physics
A baseball player uses a pitching machine to help him improve his batting average. He places the 43.4 kg machine on a frozen pond. The machine fires a 0.0546 kg baseball horizontally at a speed of 44.8 m/s. What is the magnitude of the recoil velocity of the machine? ...
December 2, 2012

Physics
A solid metal ball and a hollow plastic ball of the same external radius are released from rest in a large vacuum chamber. When each has fallen 1 m, they both have the same 1. momentum. 2. inertia. 3. speed. 4. change in potential energy. 5. kinetic energy.
December 2, 2012

Chemistry
thanks!
December 1, 2012

Chemistry
Calculate delta H for this reaction: N2 + 3H2 --> 2NH3 I am given the bond dissociation energy for N-N (163 kJ/mol), H-H (436 kJ/mol), and N-H (391 kJ/mol) I can't seem to find a similar problem anywhere, they are all given 2 or 3 similar equations.
December 1, 2012

physics HELP!
The observed wave speed is 20.3 m/s when the suspended mass is m = 3.07 kg. What is the mass per unit length of the string? I keep calculating this out to be .5199 kg/m which i know is wrong! HELP!
November 30, 2012

Into. Chemistry
I'm trying to do this precipitation reaction problem, but I don't understand part of it. The question is: Does a precipitate form when aq. soultions of potassium nitrate (KNO3) and sodium iodide (NaI) are mixed? Then it lists the solutions for the two: KNO3(aq) --> ...
November 30, 2012

Chemistry
If saturated solution of barium chloride at 30 degree Celsius contains 150g water how much additional barium chloride can be dissolved by heating it to 60 degree Celsius? 30 degrees Celsius = 38.2 60 degrees Celsius = 46.6
November 30, 2012

English
In Romeo and Juliet, what is ironic about Lord Capulet's praise of Friar Lawrence in Act 4 Scene 2?
November 29, 2012

us history
Compara and contrast your modern immigrant to historical immigrants. Atleast 10 bullets on each section. (Historical Immigration, both, and Modern immigration)
November 29, 2012

Physics
Two different simple harmonic oscillators have the same natural frequency (f=5.60 Hz) when they are on the surface of the Earth. The first oscillator is a pendulum, the second is a vertical spring and mass. If both systems are moved to the surface of the moon (g=1.67 m/s2), ...
November 28, 2012

Physics
A 2.24 kg mass on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 4.45 N/m. The mass is displaced 3.06 m to the right from its equilibrium position and then released, which initiates simple harmonic motion. What is the ...
November 28, 2012

science
A 2.24 kg mass on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 4.45 N/m. The mass is displaced 3.06 m to the right from its equilibrium position and then released, which initiates simple harmonic motion. What is the ...
November 28, 2012

physics
A 53.6 kg circus performer bobs up and down at the end of a long elastic rope at a rate of once every 2.80 s. The elastic rope obeys Hooke's law. Find how much the rope is extended beyond its unloaded length when the performer hangs at rest. ** I think Im missing a step ...
November 28, 2012

physics
An archer pulls her bow string back 0.370 m by exerting a force that increases uniformly from zero to 225 N. What is the equivalent spring constant of the bow?
November 28, 2012

English
What about this one. Seeing the old slides remind reminded me of the good times we had. The verbal is seeing and it is a gerund?
November 27, 2012

English
In the first sentence I think it is a noun but in the second sentence I think it is an adjective? Is that correct?
November 27, 2012

English
Baking is a major project for the holidays. Is the verbal baking? Is this a gerund or a participle and why? Baking in the oven, the bread smelled delicious. Is the verbal baking in the oven? Is this a gerund or a participle and why?
November 27, 2012

Statistics
All else equal will the confidence intervals for samples of size 80 be longer or shorter than those for sample of size 40?
November 26, 2012

Math
decide on a topic which is adding drinks to each purchase from the lunch for which they would like to collect data and design a survey for school which could really be used to convince the principal to do. Create 7 questions for the survey. My questions so far are: Would you ...
November 25, 2012

Science
Sorry the subject is science
November 21, 2012

niches
can animals be consumers and decomposers? or are they only separated?
November 21, 2012

Spanish
Is this wrong? Tienen que hacen las maletas. Salen para Monterrey mañana.
November 21, 2012

math
decide on a topic which is adding more clubs for which they would like to collect data and design a survey for school which could really be used to convince the principal to do. Create 5-7 questions for the survey. Some of my questions for the survey are: Do you want to add ...
November 20, 2012

Math
How long it will take for an investment of 2000 dollars to double in value if the interest rate is 9.5 percent per year, compounded continuously?
November 19, 2012

Math
decide on a topic which is adding more clubs for which they would like to collect data and design a survey for school which could really be used to convince the principal to do. Create 5-7 questions for the survey.
November 19, 2012

Physical Chemistry
"Liquids A and B, which have identical molar volumes, are mixed together in equal volumes to form a 75 mL mixture. The liquids are partially miscible and the mixture phase separates into an upper phase with a composition xA=0.45 and a lower phase with a composition xA=0....
November 19, 2012

Math
Will someone please assist me?
November 18, 2012

physics help!
When a gas follows path 123 on the PV diagram in a rectangle shape labeled 1234 cycle, 449 J of heat flows into the system and 179 J of work is done. What is the change in the internal energy of the system? * I keep coming up with 270 but this is incorrect. PLEASE HELP :)
November 18, 2012

Chemistry
Ag(NO3)+ CaClYields to AgCl + (NO3)Ca KI + Pb(NO3) yields to K(NO3)+ IPb What is the precipitate in both??
November 15, 2012

math((PLEASE HELP!))
5-3r=-37 r= ? x/8+10=13 x= ?
November 14, 2012

7th grade math Ms. Sue please check
#8 is 25%
November 14, 2012

math((PLEASE HELP!))
5-3r=-37 r= ? x/8+10=13 x= ?
November 14, 2012

Math
Is a bar graph better than a pictograph to display data? Explain.
November 14, 2012

Physics
A golf club strikes a 0.061-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball’s motion, has a magnitude of 7760 N, and is in contact with the ball for a distance of 0.014 m. ...
November 14, 2012

Physics
The brakes of a truck cause it to slow down by applying a retarding force of 8740 N to the truck over a distance of 1130 m. What is the work done by this force on the truck?
November 14, 2012

Algebra
It says this site is homework help, why don't you evaluate it for her? She needs help!
November 12, 2012

math
emma has 364 cookes . chis has 8956432090 cookes .aaron has 14235 times as many cookes as chis and emma
November 10, 2012

science
3 is Commensalism 4 is none of the above. (~:
November 10, 2012

fractions from least to greatest
I dont now
November 7, 2012

Physics Help!
Find the total kinetic energy content of 1.55 moles of an ideal gas at temperature 435 K
November 6, 2012

Physics Help!
Gas is contained in an 8.45 liter vessel at a temperature of 19.8oC and a pressure of 8.70 atm. Determine the number of moles of gas in the vessel. Do not enter units.
November 6, 2012

Physics Help!
An automobile fuel tank is filled to the brim with 45.3 liters (12.1 gallon) of gasoline at 14.5 degrees C. Immediately afterward, the vehicle is parked in the Sun, where the temperature is 34.5 degrees C. How much gasoline (in Liter) overflows from the tank as a result of the...
November 6, 2012

Physics Help!
The New River Gorge bridge in West Virginia is a 514 m long steel arch. How much will its length change between temperature extremes -20.3 degrees C and 32.7 degrees C
November 6, 2012

Math
The answer is 30
November 5, 2012

math
Nathan sells pencils in boxes of 10 and 12. Roy bought x boxes of 12 pencils. (a) Write down an expression, in terms of x, for the number of pencils Roy bought
November 5, 2012

physics
A golfer launches a golf ball off a tee that has been raised 24.8 meters off the ground. If the golfer strikes the ball with a velocity of 26.5 m/s at an angle of 45.8 degrees, how far will the ball carry in the air before hitting the ground below?
November 4, 2012

Physics
A flatbed egg truck is in a drag race. The truck is carrying a 450 lb. crate of eggs in the back. The coefficients of friction between the crate and the truck bed are μs = 0.9 and μk = 0.4. What is the maximum acceleration the truck can have without the eggs sliding ...
November 4, 2012

PHYSICS
When the speed booster is set up horizontally at the edge of a table (h=1.11 m) it sends a toy car of mass m=0.06kg in the projectile motion, so that it lands at horizontal distance of x1=1.36 m away from the edge of the table. When the sam car with the same speed booster are ...
November 1, 2012

Physics
The essential part of the Hot Wheels speed booster is made of two fast spinning, rubberized disks of radius r=0.048 m each. The toy car entering the booster is in direct contact with both wheels, which send it away after brief encounter with it. When the speed booster is set ...
November 1, 2012

Physics
A 58-kg vampire and 176-kg werewolf clash during the Feat of Strength part of the annual celebration of Festivus. The werewolf velocity just before the clash is 7 m/s and is directed upwards, while the vampire velocity at the moment of the collision is 12m/s and is directed ...
November 1, 2012

language
sorry sweetie i got nothin but u can check out a halloween word scramble website and try 2 find the answer sheet but good luck
November 1, 2012

language
ummm ourland???
November 1, 2012

language
can u please help me unscramble this halloween word....."ouracland"
November 1, 2012

math((PLEASE HELP!))
7+l/5=-4 (n/-3)-2=8
October 30, 2012

math((PLEASE HELP!))
I just need help on the first and last problems that are bugging me
October 30, 2012

math((PLEASE HELP!))
Thank you , I get it now.
October 30, 2012

math((PLEASE HELP!))
7+l/5=-4 46-3t=-23 6+a/4=8 6h+24=0 -5b-23=9 15-3e=-6 15w-4=41 6s+3=-27 14o-17=39 n/-3-2=8
October 30, 2012

ap chemistry
A 4.47 g sample of a molecular compound is dissolved in 96 g of tetrachloromethane. The normal boiling point of the solution is 61.51 degrees celcius, the normal boiling point for CCl4 is 61.2 degrees celsius. The boiling point constant for CCl4 is 4.95K*kg/mol. What is the ...
October 30, 2012

science
umm is all light energy from the sun?Explain<-----i hate that when you have to explaim=n
October 30, 2012

physics
suppose an automobile has a kinetic energy of 2900J. when it moves with 3 times the speed, what will be its kinetic energy? answer in the units of joules
October 28, 2012

PHYSICS!
A 8.52 -kg block of metal is suspended from a scale and immersed in water as in Figure P9.30. The dimensions of the block are 12.0 cm x 10.0 cm x 10.0 cm. The 12.0-cm dimension is vertical, and the top of the block is 9.0 cm below the surface of the water. (a) What are the ...
October 28, 2012

science
Thank you You find websites and answers so fast Ms.Sue Thanks for all your help Sorry if I was troubling you
October 28, 2012

science
how about winter boots
October 28, 2012

science
Ms.Sue thank you so much
October 28, 2012

science
thanks for the website but is there any with feet like skis.
October 28, 2012

science
what are animals that have feet like running shoes
October 28, 2012

science
Thanks Ms.Sue
October 28, 2012

science
what are the reasons
October 28, 2012

science
I don't know why animals don't have running shoes or any other types of shoes?
October 28, 2012

science
Running Shoes are used to protect your feet from bruises, the weather and cuts.
October 28, 2012

science
Why do human beings use running shoes, winter boots, snowshoes, skis and flippers? Why are these not biological adaptations? Use animals as examples. Write 4-5 sentences.
October 28, 2012

science
I do not understand
October 28, 2012

PHYSICS!
In scuba diving, a regulator is used so that the pressure of the air the diver breathes is close to that of the ambient water. A reckless swimmer decides to use a hose sticking out of the surface to breathe underwater while diving in a lake. When the air pressure in the lungs ...
October 27, 2012

physics
An evacuated spherical diving bell containing a camera is in the ocean at a depth of 107 m. It has a flat, transparent, circular port with a diameter of 10.5 cm. Find the magnitude of the total force on the port. For the density of seawater use 1025 kg/m3.
October 27, 2012

physics
Piston 1 has a diameter of 0.643 cm. Piston 2 has a diameter of 4.59 cm. In the absence of friction, determine the force required on piston 1 necessary to support an object, m, with weight 1151 N. (Neglect the height difference between the bottom of the two pistons, and assume...
October 27, 2012

math
Ann makes 4 signs in 1 and 1/4 hours and if he worked 6 2/8 hours how many signs can he make?
October 24, 2012

Physics
Astronomers can calculate the mass of a planet by using the orbital parameters of one of its moons. Consider a hypothetical planet, which has a hypothetical moon that orbits the planet in a roughly circular orbit with a radius of 3.95*10^8 m. The moon takes 12 Earth days to ...
October 23, 2012

PHYSICS
A block of mass 0.86 kg is suspended by a string which is wrapped so that it is at a radius of 0.061 m from the center of a pulley. The moment of inertia of the pulley is 4.60×10-3 kg·m2. There is friction as the pulley turns. The block starts from rest, and its ...
October 21, 2012

physics!!
The two masses (m1 = 4.96 kg and m2 = 2.90 kg) in the Atwood's machine shown in the figure below are released from rest, with m1 at a height of 0.800 m above the floor. When m1 hits the ground its speed is 0.203 m/s. Assuming that the pulley is a uniform disk with a radius...
October 21, 2012

physics
The wire makes a 60 degree angle from the right end of the board to the upper left. The beam is attached at a 90 degree angle to the wall on the left
October 21, 2012

physics
A hungry 675 -N bear walks out on a beam in an attempt to retrieve some "goodies" hanging at the end. The beam is uniform, weighs 250 N, and is 5.00-m long; the goodies weigh 110 N. When the bear is at x = 1.00 m, find the tension in the wire and the components of ...
October 21, 2012

physics
To determine the location of his center of mass, a physics student lies on a lightweight plank supported by two scales L = 2.44 m apart. If the left scale reads 309 N, and the right scale reads 125 N, calculate the student's mass. Calculate the distance from the student&#...
October 21, 2012

physics
That is exactly the way I have been doing this problem and I keep getting the wrong answer. I keep getting 2.831 m/s
October 19, 2012

physics
After you pick up a spare, your bowling ball rolls without slipping back toward the ball rack with a linear speed of v = 3.27 m/s To reach the rack, the ball rolls up a ramp that rises through a vertical distance of h = 0.572 m. What is the linear speed of the ball when it ...
October 19, 2012

Science
Calculate the molarity of the following solution: 7.48g of calcium chloride (CaCl2) in 215 mL of aquous solution.
October 19, 2012

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