Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 70,626

**Chemistry**

6.626 x 10^-34/ m x 1.26 times 10^5 what is plugged in for the mass if it is not given?

**Chemistry**

What is the de Broglie wavelength of an electron traveling at 1.26×105m/s ?

**trig**

16cos(x)-3sec(x)=0 Find all solutions for x in [0, 2pi)

**math**

Kyle reduced his investment in Collins Company from $11,700 to $4,300. What was the percentage rate of decrease?

**Math**

A rectangular backyard measures 15 meters by 20 meters.there is a square flower bed in the middle of the yard with three sides of 3 meters.what is the area of the yard only?

**Algebra**

7(√6/32) I did: 7(√6/32) * (√32/√32) 7(√192/32) ...but then what?

**Math**

A sidewalk borders a rectangular play area.the play area measures 20ft by14ft.the width of the sidewalk is 2 ft.what is the perimeter of the outside borders of the sidewalk?

**Biology help**

How does a gene determine a trait?

**Math**

(6/7c)^2 Is this 6/7c^2?

**Algebra**

I multiplied (√6/√32) by (√32/√32).

**Algebra**

7(√6/32) I came until 7(√192/32). How do I proceed from here?

**algebra**

(12*50) + (16*50) = ?

**algebra**

Gabby walks 12 blocks east from school and then 16 blocks south and each block is 50 yards how far is Gabby from school in yards?

**math**

1third * 1 hafl

**Math 70**

At a county fair, an adult ticket sold for $6.00, a senior citizen’s ticket for $4.50, and a child’s ticket for $2.00. On Friday, the number of adults and senior citizen’s tickets sold was 5 more than the number of children’s tickets sold. The number of adu...

**Physics**

A golf ball, mass 0.048 kg, rests on a tee. It is struck by a golf club with an effective mass of 0.225 kg and a speed of 44 m/s. Assuming the collision is elastic, find the speed of the ball when it leaves the tee (remember: you can not assume the club is at rest after the co...

**physics**

Assume that the dots in the painting are separated by 1.0 mm and that the wavelength of the light is vacuum= 500 nm. Find the distance at which the dots can just be resolved by (a) the eye and (b) the camera. I know that the resolving equation is (angle)min = 1.22(wavelength) ...

**Algebra**

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

**Science**

We just learned about mitosis and my teacher is giving a test over it and other things tomorrow. We have to write the mitosis steps in order, label the chomatids, nuclear membrane, spindle fibers, and centrioles, and have a sentence describing them. How could I remember this?

**calculus help for Steve**

When I put your answer into WebAssign it marked as wrong so are you sure this is the right answer?

**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!

**biology**

GCCATGTT GCGTACTT C --> G A --> T T --> A G --> C all of these are transversion (pyrimidine changing to purine)

**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

**Math **

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

**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?

**Algebra Work Check**

Thanks!

**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.

**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

**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.

**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?

**science 1 question**

Force = mass X acceleration

**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 fie...

**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 so...

**Math**

The answer key says -126√a.

**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...

**chemistry**

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

**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.

**chemistry**

K is not given.

**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?

**chemistry**

thank you for the walk through.Very helpful.

**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 allowe...

**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.

**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

**chemistry**

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

**chemistry**

thanks!

**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)

**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.

**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.

**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

**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...

**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. Fi...

**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 ...

**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 d...

**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...

**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!

**Physic**

hhkhk

**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 w...

**Pre-Cal**

the 4 is supposed to be 8, but im trying to find the amplitude, midline, and period. Sorry forgot to put that.

**Pre-Cal **

2y=cos(4(t-6))+6

**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.

**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

**Language arts verbs **

Aaron plans to attend college once he completes this course workbook

**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

**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?

**Physics**

34.1

**Physics**

hi

**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.

**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 temperatur...

**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...

**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 t...

**Science**

A?

**Science**

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

**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 mone...

**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

**English help**

Don't have any

**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 ...

**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. (...

**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?

**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 mode...

**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?

**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.

**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?

**physics**

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

**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.

**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?

**Science**

How do gravitational and electrical forces act on a maglev train?

**calculus**

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

**chemistry**

how many grams of CO2 are produced when 88 grams of O2 are reacted with an excess of butane?

**math**

A fish is swimming 18 centimeters beliw the surface of the stream which integer best describes the elevation

**Social Studies**

What were the jobs performed by the British when they were in India, back in 1858

**Social Studies**

What were the resources of India back in 1858?

**Science**

Can someone explain center of mass in simple terms?

**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?

**social studies (check answers)--Mrs.Sue**

1. incorrect 3. I agree I don't know about 2.

**math**

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

**math**

Neither B or D is right.

**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

**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

**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...

**managerial accounting **

what is nile's strategy for success in the marketplace ?

Pages: <<Prev | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | **19** | 20 | 21 | 22 | 23 | 24 | 25 | Next>>