Friday
August 22, 2014

Posts by Anonymous


Total # Posts: 69,773

calculus help
A particle is moving with the given data. Find the position of the particle. a(t)= (t^2 - 5t +7) , s(0)=0 , s(1)=20 Thanks!
April 23, 2014

biology
GCCATGTT GCGTACTT C --> G A --> T T --> A G --> C all of these are transversion (pyrimidine changing to purine)
April 23, 2014

science
A bat moving at 5.6 m/s is chasing a flying insect. The bat emits a 60 kHz chirp and receives back an echo at 60.63 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 338 m/s. Answer in units of m/s
April 23, 2014

Math
(-1/3)√18c^5 * (-6√8c^9) 2√144c^14 ---> I came until here but then didn't know how to proceed.
April 23, 2014

geometry
A satellite launch rocket has a cylindrical fuel tank. The fuel tank can hold V cubic meters of fuel. If the tank measures d meters across, what is the height of the tank in meters?
April 23, 2014

Algebra Work Check
Thanks!
April 23, 2014

Algebra Work Check
The problems are 5√6 * (1/6)√216 and -9√28a^2 * (1/3)√63a. Actually, I checked my final answers, but I just wanted to make sure that my process is correct.
April 23, 2014

Algebra Work Check
1. 5√6 * 1/6√216 5/6 * √1296 5/6 * √144 * √9 = 30 2. -9√28a^2 * 1/3√63a -3√1764a^3 -3√49a^2 * √36a -3*7a*6√a = -126a√a
April 23, 2014

Language Arts
1 and 2 : I don't see anything missing. 3. Correct 4. Wrong 5. None of those choices is correct. There should be additional commas after each state.
April 23, 2014

accounting
If you can earn 4 percent, how much will you have to save each year if you want to retire in 35 years with $ 1 million?
April 23, 2014

science 1 question
Force = mass X acceleration
April 23, 2014

physics
In Figure 20.2 is a velocity selector that can be used to measure the speed of a charged particle. A beam of particles is directed along the axis of the instrument. A parallel plate capacitor sets up an electric field E which is oriented perpendicular to a uniform magnetic ...
April 23, 2014

chemistry
Lactic acid, CH 3 CHOHCO 2 H, is found in sour milk, in sauerkraut, and in muscles after activity. K a for lactic acid = 1.4 x 10 -4 . a. If 2.75 g of NaCH 3 CHOHCO 2 , sodium lactate, is added to 5.00 x 10 2 mL of 0.100 M lactic acid, what is the pH of the resulting buffer ...
April 23, 2014

Math
The answer key says -126√a.
April 23, 2014

Math
Simplify the product. -9 sqrt 28a^2 * 1/3 sqrt 63a I came until -3 sqrt 49a^2 * sqrt 36a, but then I got confused...
April 23, 2014

chemistry
I got [H+]= 0.14M and for [HC2O4]=0.14M and [C2O4^=] 5.1x10^-5 Is this correct?
April 22, 2014

chemistry
what is the hydronium ion concentration of a 0.35M oxalic acid, H2C2O4. solution? for oxalic acid, ka1= 5.6x10^-2 and ka2=5.1x10^-5. Identify and calculate the concentrations for the representative species in solution.
April 22, 2014

chemistry
K is not given.
April 22, 2014

chemistry
consider the following equilibrium. 4NH3(g) +3O2(g)<-> 2N2(g) + 6H2O(g) suppose 0.30mol of NH3 and 0.40mol of oxygen are added to a 5.0L container. If x mol of water is present at equilibrium, what is the equilibrium concentration of oxygen?
April 22, 2014

chemistry
thank you for the walk through.Very helpful.
April 22, 2014

chemistry
Dinitrogen tetroxide decomposes to form nitrogen dioxide in a second order reaction: N2O4(g)-> 2NO2(g) At 400K, the rate constant for this reaction has been measured to be 2.9x10^8 L/mol*s.suppose 0.222 mol of N2O4(g) is placed in a sealed 41.7L container at 400K and ...
April 22, 2014

chemistry
what is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 4.37M? the density of the solution is 1.1655 g/mL.
April 22, 2014

chemistry
volume=1.442x10^-8cm 4atoms per cell so, 4x (1/6.022x10^23) x 196.97g = 1.31x10^-21 g of gold cell volume=(1.442x10^-8cm)^3= 2.99x10^-24 density=(1.31x10^-21)/(3.0x10^-24)=438g/cm^3
April 22, 2014

chemistry
the metal gold, with an atomic radius of 144.2pm crystallizes in a face-centered cubic lattice. what is the density of gold?
April 22, 2014

chemistry
thanks!
April 22, 2014

chemistry
the autoionization of water, as represented by the equation below, is known to be endothermic. What can be correctly said of what occurs as the temperature of water is raised?(please explain) H2O(l)+H2O(l)<->H3O+(aq) + OH-(aq)
April 22, 2014

chemistry
which of the following solutes, dissolved in 1kg of water, would be expected to provide the fewest particles and to freeze at the highest temperature? (NH4)2SO4 , CaCl2, and/or NaCl.
April 22, 2014

chemistry
What will happen if 50mL of 0.022M Na2S2O3, 50mL of 0.010M AgNO3, and 50mL of 0.097M KCl are mixed together? For AgCl, ksp=1.8x10^-10 ; for Ag(S2O3)2^3-, Kf= 2.9 x 10^13.
April 22, 2014

physics
First start with an isothermal expansion at 2.0 atm from 1.0 L to 4.0 L. If this now is adiabatically compressed back to its original volume, what is the change in internal energy here? Also what are some examples of these processes
April 22, 2014

physics 1
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 5.6 x 1028 kg and 1.5 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this material, how much would...
April 22, 2014

physics
A bowling ball encounters a 0.760-m vertical rise on the way back to the ball rack, as the drawing illustrates. Ignore frictional losses and assume that the mass of the ball is distributed uniformly. The translational speed of the ball is 4.43 m/s at the bottom of the rise. ...
April 22, 2014

physics
Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 4.44 rad/s. The mass m of each object and its perpendicular distance r from the z axis are as follows: (1) m1 = 6.00 kg and r1 = 1.00 m, (2) m2 = 4.50 kg and r2 = 7.10 m, (3) m3 = 3.60 ...
April 22, 2014

English help
From the words below, supply the words needed to complete the sentences. Chronic, clairvoyance, inadvertent, pretentious, celestial, vanguard. A. John had a CHRONIC back pain that left him bedridden. He refused, however, to visit the doctor because of the PRETENTIOUS way the ...
April 22, 2014

English help
From the words below, supply the words needed to complete the sentences. Vicariously, vicissitudes, tawdry, ponderous, sycophant, implausible. A. One might say that Tennessee Williams lived VICARIOUSLY through the character of brick in his play cat on a hot tin roof. Big daddy...
April 22, 2014

calculus help
find the position function s(t) given acceleration a(t)=3t, if v(2)=0, and s(2)=1. the answer is s(t)=(t^3/2)-6t +9 but I don't know how to solve this. Can someone help me with this? Thank you!
April 22, 2014

Physic
hhkhk
April 22, 2014

Physic
A bullet strikes a ballistic pendulum whose target block has a mass of 4kg. The block is observed to rise a distance of 3cm, and the bullet is weighed and found to have a mass of 20g. What is the speed of the bullet when it strikes the block? (Answer: 154m/s) Please show all ...
April 22, 2014

Pre-Cal
the 4 is supposed to be 8, but im trying to find the amplitude, midline, and period. Sorry forgot to put that.
April 22, 2014

Pre-Cal
2y=cos(4(t-6))+6
April 22, 2014

Math
Luke rode his bicycle 2/5 of a mile from his house to the library.He then rode 1/2 of a mile from the library to the mall.Sketch a visual model to find the total distance that Luke rode.
April 22, 2014

health
how is cardiac muscle similar to smooth muscle a. both are striated b.they share no similarities c. they share no differences d. both have one central nucleus
April 22, 2014

Language arts verbs
Aaron plans to attend college once he completes this course workbook
April 22, 2014

health
what is the primary function of the skeletal muscle a. protecting the body from harm b. heating the body c. contraction d. pumping blood to the rest of the body
April 22, 2014

physics 1
A person who weighs 869 N is riding a 98-N mountain bike. Suppose the entire weight of the rider plus bike is supported equally by the two tires. If the gauge pressure in each tire is 7.80 x 105 Pa, what is the area of contact between each tire and the ground?
April 22, 2014

Physics
34.1
April 22, 2014

Physics
hi
April 22, 2014

geometry
The shape is a hexagon. It would be a pentagon if it had 5 sides, but it has 6 sides instead, so it has to be a hexagon.
April 22, 2014

chemistry
1)A sample of CO2 gas which weighs 0.85 grams has a volume of 1.30 liters when collected at 30°C. What would be the pressure of the gas sample? 2) A gas sample has an original volume of 600 ml when collected at 720 mm and 35°C. If a change is made in the gas ...
April 22, 2014

physics 1
Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 5.6 x 1028 kg and 1.5 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this material, how much would...
April 22, 2014

Physic
A 135 g baseball traveling at a speed of 36 m/s hits a bat and moves back along its incoming trajectory with a speed of 47 m/s. a) What is the impulse delivered to the ball by the bat? (Answer: 11.2kg * m/s) b) If the duration of the bat-ball collision is 7 x 10^-4s, what is ...
April 22, 2014

Science
A?
April 22, 2014

Science
Which of the following would increase the magnetic field around a wire? A. solenoid B. insulator C. conductor D. resistor
April 22, 2014

English help
From the words below, supply the words needed to complete the sentences. Prodigious, Impartial, Profusion A. While the big money contributors had remained IMPARTIAL at the beginning of the campaign, when it narrowed down to the two chief contenders, a PRODIGIOUS amount of ...
April 22, 2014

Physics
A charge q1 of -5.00*10^-9C and a charge q2 of -2.00*10^-9C are separated by a distance of 40.0cm. Find the equilibrium position for a third charge of 15.0*10^-9C
April 22, 2014

English help
Don't have any
April 22, 2014

English help
A music conductor is one who ________. To lead one in is to ________, and abduct is to ________. Chrono means "time" so to "synchronize" means to __________. Since phon means sound, symphony must be _______. If thesis means "idea", then synthesis ...
April 22, 2014

Physic
If a 35 g arrow moving at 160 km/h penetrates a block of wood suspended by a rope, what impulse is delivered to the block? (Answer: 1.56kg * m/s) What velocity will the wood block acquire if its mass is 7.0 kg? Ignore the mass of the arrow compared to that of the wood block. (...
April 22, 2014

English
1. violet: flower:: A. psychosis: illness B. pink: red C. shadow: sun D. chair table Is it A? 2. gems: jeweler:: A. gold: miser B. airplane: pilot C. driver: car D. clay: potter Is it B? 3. day: night:: A. few: many B. red: color C. fin: fish D. life: death Is it D?
April 22, 2014

physics
A small ball with a mass of 0.05 kg moves along a circular orbit with a radius of 0.9 m at a speed of 9.0 m/s. What is the angular momentum of the ball? If the angular momentum of this ball were quantized in the same manner as the angular momentum of electrons in the Bohr ...
April 22, 2014

physics
) A hydrogen atom has its electron in the n = 5 level. The radius of the electron's orbit in the Bohr model is 1.323 nm. Find the de Broglie wavelength of the electron under these circumstances. What is the momentum, mv, of the electron in its orbit?
April 22, 2014

physics
If a proton were traveling the same speed as electrons in a TV picture tube (about 7.2 107 m/s), what would its de Broglie wavelength be? The mass of a proton is 1.67 10-27 kg.
April 22, 2014

physics
In a typical electron microscope, the momentum of each electron is about 1.4 10-22 kg-m/s. What is the de Broglie wavelength of the electrons?
April 22, 2014

physics
Things around you are emitting infrared radiation that includes the wavelength 1.44 10-5 m. What is the energy of the photons?
April 22, 2014

physics
Gamma rays (γ-rays) are high-energy photons. In a certain nuclear reaction, a γ-ray of energy 0.306 MeV (million electronvolts) is produced. Compute the frequency of such a photon.
April 22, 2014

Algebra
There are 60 marbles in a bowl. Their colors are red, blue, and yellow. 1/3 of the marbles are yellow, 1/4 of the marbles are blue. How many red marbles are there in the bowl?
April 22, 2014

Science
How do gravitational and electrical forces act on a maglev train?
April 22, 2014

calculus
x(t)=3t^3-40.5t^2+162t find where object is speeding up or slowing down
April 22, 2014

chemistry
how many grams of CO2 are produced when 88 grams of O2 are reacted with an excess of butane?
April 22, 2014

math
A fish is swimming 18 centimeters beliw the surface of the stream which integer best describes the elevation
April 22, 2014

Social Studies
What were the jobs performed by the British when they were in India, back in 1858
April 22, 2014

Social Studies
What were the resources of India back in 1858?
April 22, 2014

Science
Can someone explain center of mass in simple terms?
April 22, 2014

English
Neither I nor she will able to climb the tree. Neither I or she will able to climb the tree. Which sentence is right and why?
April 22, 2014

social studies (check answers)--Mrs.Sue
1. incorrect 3. I agree I don't know about 2.
April 22, 2014

math
Do you know how to find what they are asking (outlier, mean)?
April 22, 2014

math
Neither B or D is right.
April 22, 2014

Algebra
a cylindrical water tank has a volume of 20π cubic feet . the height of the tank is 1 foot more than 2 times of its radius . find the radius and height of the tank
April 22, 2014

math
An analysis of the ledger detail is required to differentiate owner's equity beginning balance from the amount of additional investments made during the period. True
April 22, 2014

statistics
The process that produces Sonora Bars (a type of candy) is intended to produce bars with a mean weight of 55 gm. The process standard deviation is known to be 0.77 gm. A random sample of 49 candy bars yields a mean weight of 55.82 gm. Find the test statistic to see whether the...
April 22, 2014

managerial accounting
what is nile's strategy for success in the marketplace ?
April 22, 2014

rela
elizabethan social classes and the roles each played in elizabethan england
April 22, 2014

writting
One of the cups are missing
April 22, 2014

Chemistry
Starting with 0.290mol SbCl3 and 0.150mol Cl2 , how many moles of SbCl5 , SbCl3 , and Cl2 are present when equilibrium is established at 248∘C in a 2.50−L flask? SbCl5(g)⇌SbCl3(g)+Cl2(g) KC=2.5×10−2at248∘C
April 22, 2014

physics
How fast does water flow from a hole at the bottom of a very wide, 7.8m deep storage tank filled with water? Ignore viscosity.
April 22, 2014

math
7/10 got to the pool by car, 1/5 took the bus, and 1/6 walked. how many more came by car than on foot? How many fewer came by foot?
April 22, 2014

Physics
234
April 21, 2014

Math
Which situation could you graph without connecting the points? the height of a hot-air balloon as it climbs the amount of electricity used by a refrigerator over time<---- the distance you are from home as you ride your bicycle to a city pool the amount of money in a cash ...
April 21, 2014

math
djndf
April 21, 2014

science
If and iron block had a lenght of 2 cm, a width of 3 cm, and a height of 1 cm and a mass of 33 g between what two liquids would it float?
April 21, 2014

English
What kind of dash/hyphen am I supposed to use in a title like this? Hammurabi - a Person of One of the World's Oldest Civilizations
April 21, 2014

calculus help
Suppose that f'(x)= (2x^2-5x-12)/(3x^2-7x+2) and that f(x) is continuous for all real numbers x. a) Do a sign diagram to list the values of x where f(x) has local maximums and local minimums. In addition, list the intervals where f(x) is increasing and decreasing. b) Draw ...
April 21, 2014

Math
A person wants to establish an annuity for retirement purposes. He wants to make quarterly deposits for 20 years so that he can then make quarterly withdrawals of $5,000 for 10 years. The annuity earns 7.32% interest compounded quarterly. A. How much will have to be in the ...
April 21, 2014

Math
no spaces  1 space   2 spaces
April 21, 2014

Math
no spaces 1 space
April 21, 2014

Math
one space two spaces 3 spaces
April 21, 2014

Math
Starting on her 21st birthday and continuing on every birthday up to and including her 65th, Jessie deposits $2,000 a year into an IRA. How much (to the nearest tenth) will be in the account on Jessie's 65th birthday if the account earns: A. 7% compounded annually? B. or ...
April 21, 2014

Science
Nevermind. I just need cell wall.
April 21, 2014

Science
Plant Cell Analogy Cell Membrane: Security Nucleus: Boss Mitochondria: Food court Cytoplasm: Chromosomes: Vacuole: Water Ribosomes: Food Cell wall: Endoplasmic Reticulum: Chloroplasts: Golgi Appartuas: Packer What could the others be?
April 21, 2014

Math
You want to purchase an automobile for $21,600. The dealer offers you 0% financing for 48 months or a $3,000 rebate. You can obtain 4.8% financing for 48 months at the local bank. Which option should you choose and why? (you would use the banks option to pay the rest after ...
April 21, 2014

Math
The population of some countries has a relative growth rate of 2.75% per year. At this rate, how many years (to the nearest tenth of a year) will it take the population to double?
April 21, 2014

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