Saturday

February 13, 2016
Total # Posts: 1,235

**math**

Simplify the following expression 8!/4!
*April 30, 2012*

**physics**

That makes so much more sense! Thanks so much!!!
*April 22, 2012*

**physics**

It was wrong and I still dont get how to do it!
*April 22, 2012*

**physics**

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.
*April 22, 2012*

**physics help!**

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.
*April 22, 2012*

**physics**

The Kâ characteristic X-ray line for tungsten has a wavelength of 1.94 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express this in each of the following units. (a) joules (b) electron volts
*April 22, 2012*

**physics**

A particle has a de Broglie wavelength of 3.30 10-10 m. Then its kinetic energy quadruples. What is the particle's new de Broglie wavelength, assuming that relativistic effects can be ignored?
*April 22, 2012*

**physics**

The Kâ characteristic X-ray line for tungsten has a wavelength of 1.94 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express this in each of the following units. (a) joules (b) electron volts
*April 22, 2012*

**change decimal to fraction**

0.31 as a fraction idk
*April 18, 2012*

**Calculus, Related Rates**

A particle at point A is 50 mm away from a second particle at point B. The first particle is moving toward point B at a constant rate and the second particle is moving at a right angle to the line AB at a rate that is 1/3 of the rate of the first particle. The particles get ...
*April 17, 2012*

**Statistics**

A private medical clinic wants to estimate the true mean annual income of its patients. The clinic needs to be within $100 of the true mean. The clinic estimates that the true population standard deviation is around $2,100. If the confidence level is 95%, find the required ...
*April 15, 2012*

**Lab Math/Statistics**

The 95% confidence interval for a quality control specimen is 9.2-10.2 mg/dl. My question is, how do I figure out the coefficient of variation (%CV) with only this information?
*April 13, 2012*

**Math**

How would I determine if a set of numbers if Gaussian or non Gaussian?
*April 13, 2012*

**Phys**

What is the speed of a wave whose frequency is 9.00Hz and wavelength is 0.654 m?
*April 12, 2012*

**crjs101**

how to present the processing requirements and the mandated pretrial measures required by law.
*April 11, 2012*

**physics**

Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.
*April 11, 2012*

**chemistry**

Bill prepared 5.00-mL of borax solution at 59.2degrees C. He diluted the solution in an Erlenmeyer flask and titrated it to an endpoint with 27.05 mL of 0.500 M HCl. What is the saturation concentration of borate ions? I don't know what to do here. Does it involve a Ksp? ...
*April 9, 2012*

**Math**

Given P(x) = x^3 - 3x^2 - 5x + 10 a evaluate P9x) for each integer value of x from -3 through 5 b. Find all zeros of P(x) d. Prove that 5 is an upper bound on the zeros of P(x)
*April 9, 2012*

**Algebra**

solve: (1/(x-10)+(1/20)=(1/(20(x^2-100))
*April 8, 2012*

**Algebra**

((k^2+6k+9)/(k^2+12k+27))×(k^2+9)/((k^2+12k+27)) express in lowest terms
*April 7, 2012*

**Interediate algebra**

if f varies jointly as q^2 and h, and if f = 72 when q = 3 and h = 4, find h when f = 48 and q = 2
*April 7, 2012*

**Government**

In which type of colony did strict governors anger the colonists?
*April 3, 2012*

**english**

k and what about the others?
*April 3, 2012*

**english**

alright and 4) the infinitive phrase is a adverb?
*April 3, 2012*

**english**

the infinitive phrase in number 5)a noun?
*April 3, 2012*

**english**

i don't know how to identify the infinitive phase
*April 3, 2012*

**english**

what is the function of the italicized infinitive phrase in these sentences? 1)May I have permission to use the car tonight? 2)He went to Europe to study architecture. 3)Can you give me a place to put my things? 4)I want to go with you to the store. 5)To help you is my ...
*April 3, 2012*

**english**

cause i don't know this stuff that much
*April 3, 2012*

**english**

would it be the subject?
*April 3, 2012*

**english**

so in the second one 2)Brett earns his income by repairing cars. the gerund phrase is =by repairing cars and the function is= direct object?
*April 3, 2012*

**english**

what is the Gerund phrase and Noun function in these sentences? 1)Writing a research paper sounds difficult. 2)He must like studying calculus. 3)Her favorite pastime is entertaining friends. 4)Water skiing, sailing, and swimming are my favorite summer sports. 5)I enjoy playing...
*April 3, 2012*

**Phys**

A Brass rod 50.0 cm long expands 0.0734 cm when heated. Find the temperature change.
*April 2, 2012*

**Chemistry**

I went (dP/dT)fusion=deltaSm(fusion)/deltaVm(fusion) =deltaHm(fusion)/Tfusionm(1/pliq. - 1/psolid) =-140 barK^-1 So then deltaT=-deltaP/140 What is L? volume (litres?)
*March 29, 2012*

**Chemistry**

The normal melting point of H2O is 273.15 K, and deltaH fusion is 6010 J/mol. Calculate the change in the normal melting point at 175 and 625 bar assuming that the density of the liquid and solid phases remains constant at 997 and 917 kg/m^3 respectively. Explain the sign of ...
*March 29, 2012*

**Chemistry**

How many grams of lead(ii)iodide are generated when 400.0ml of 1.25M NaI reacts with 525.0ml of 1.00M Pb(NO3)2 according to the following balanced equeation? 2NaI + Pb(NO3)2---> 2NaNO3 + PbI2
*March 29, 2012*

**Biology**

Where is the Barnacle zone located in a rock platform ecosystem(Upper littoral, upper mid-littoral, lower mid-littoral or lower littoral zone)?
*March 29, 2012*

**Chemistry**

pH of 10^-3M HAc and 10^-2M NH4Cl in aqueous solution?? Do you just figure out each [H+] concentration separately and then add them??
*March 22, 2012*

**physics**

A short box with a large flat base is made of iron. The box has mass mI = 890 kg and specific heat cI = 450 J/kg◦C. The box is filled with water. The water has mass mW = 1220 kg and specific heat cW = 4180 J/kg◦C. The box and water are initially at temperature T0...
*March 14, 2012*

**Alg. 2**

3x-2/12 - 1/6 = 1/6 Please help me to solve.
*March 12, 2012*

**US History **

Why did many progressives of both major parties saw American entry into World War I as a peerless opportunity? Many Progressives during the First World War, Republican and Democrat alike, realized something of great importance to furthering their goals: they saw that the ...
*March 11, 2012*

**US History Since 1876**

How is the KKK and the Universal Negro Improvement Association the same? I am having trouble with coming up with reasons on how they were the same. I have several different reason's why they are not but I need help with this please!!
*March 10, 2012*

**english 11**

1. In persuasive writing, it is important to (1 point)anticipate and address counterarguments. clearly state your position. provide facts and examples to back up your position. practice all of the above. 2. “Redskin” was originally a term for (1 point)Indians in ...
*March 9, 2012*

**US History Since 1876**

WW 1 WWI ended with the Americans only seeing very little action. Its clear that the brunt of the fighting in the West was taken by the British Empire/Commonwealth and the French. The Bolshevik Revolution in Russia gave Germany the opportunity to wage the war on one front. ...
*March 3, 2012*

**US History Since 1876**

Did the United States win the war for the Allied Powers? Discuss the American contribution to the war effort and evaluate its significance.
*March 3, 2012*

**statistics**

Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the alloted time?
*March 3, 2012*

**Math**

1. The manager of a bottle shop makes 25% profit on the cost price of all bottles of wine sold in the shop. She charges $12 for a bottle of Open View reisling. A hotel room service charged $30 for a similar bottle of Open View reisling. a) How much profit does the hotel room ...
*February 28, 2012*

**Math**

Transform the equation by completing the square: 4x^2 + y^2 - 8x + 6y -3 =0 Also show foci
*February 27, 2012*

**Advanced Maths (Vectors) AQA Level, please help?**

I need help on this aswell
*February 26, 2012*

**Physics**

A 2 kg clay ball traveling left to right at a speed of 6 m/s strikes and sticks to a 10 kg ball at rest. What is the fractional loss of kinetic energy after collision?
*February 21, 2012*

**Science**

B)Water is constantly evaporating over the ocean surface especially at the equator due to no seasonal loss in sun intensity.
*February 21, 2012*

**Math**

1. Is it more appropriate to use scientific notation for approximates or exact numbers? why? 2. In one plantation, there are 2700 young trees correct to 2 significant figures. In the other there are 830 full grown trees, correct to 2 significant figures. a) Why is it incorrect...
*February 21, 2012*

**math**

Show that the following data could not possibly be fit by an exponential function x y 3 72 5 200 7 392
*February 20, 2012*

**math**

200(1.025)^((n+1)*2) = 200(1.03)^(2n) 2(n+1)ln1.025 = 2nln1.03 (n+1)ln1.025 = nln1.03 n(ln 1.03 - ln1.025) = ln1.025 n = 5.074 years year 2006, month January
*February 19, 2012*

**Physics**

Two circuits (the figure below) are constructed using identical, ideal batteries (emf = E ) and identical lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 4.00 W of power, how much power does each bulb in circuit 2 dissipate? Ignore changes in the resistance ...
*February 16, 2012*

**Physics**

About 5.12 x 104 m above Earth's surface, the atmosphere is sufficiently ionized that it behaves as a conductor. The Earth and the ionosphere form a giant spherical capacitor, with the lower atmosphere acting as a leaky dielectric. Find the capacitance C of the Earth-...
*February 16, 2012*

**Physics**

Two circuits (the figure below) are constructed using identical, ideal batteries (emf = E ) and identical lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 4.00 W of power, how much power does each bulb in circuit 2 dissipate? Ignore changes in the resistance ...
*February 16, 2012*

**Managerial Accounting**

12 15 16
*February 16, 2012*

**Physics**

Where do you get 10^6 m/s? So is the answer 22.5 or 225,000,000
*February 15, 2012*

**Physics**

Comic-strip hero Superman meets an asteroid in outer space, and hurls it at 750 m/s, as fast as a bullet. The asteroid is three thousand times more massive than Superman. In the strip, Superman is seen at rest after the throw. Taking physics into account, what would be his ...
*February 15, 2012*

**phi 103**

All dogs hate cats. Sirius is a dog. So Sirius hates cats" is an example of a
*February 12, 2012*

**Biology**

How are soldier crabs useful to us and what things are humans doing to wipe them out?
*February 12, 2012*

**Math**

We are currently studying "earning money" for math. I read this sentence: When a store claculates its profit as a percentage of its cost price the profit is always bigger than the profit calculated as a percentage of the selling price. What does it mean and please ...
*February 10, 2012*

**Physics**

An aluminum wire of diameter 2.47 mm carries a current of 12.9 A. How long on average does it take an electron to move 10.5 m along the wire? Assume 3.50 conduction electrons per aluminum atom. The mass density of aluminum is 2.70 g/cm3 and its atomic mass is 27.0 g/mol.
*February 10, 2012*

**Physics**

A silver wire and a platinum wire of the same length have the same resistance. What is the ratio of the diameter of the silver wire to that of the platinum wire. I did 10.6E-8/1.59E-8 but am not getting correct answer?
*February 10, 2012*

**Physics**

A silver wire and a platinum wire of the same length have the same resistance. What is the ratio of the diameter of the silver wire to that of the platinum wire.
*February 9, 2012*

**physics**

There is a +4 microCoulombs (ìC) charge at each of 3 corners of a square (each side 58. mm long). What is the force on +10 microCoulombs (ìC) placed at the center of the square?
*February 9, 2012*

**Economics**

-> In some countries, the role of women is not regarded in the same way as a man. How might this effect production in the country and the consequent effect on standard of living? -> The run up to the 2004 election saw the Liberal Coalition stress its economic management...
*February 9, 2012*

**About Economics**

-> In some countries, the role of women is not regarded in the same way as a man. How might this effect production in the country and the consequent effect on standard of living? -> The run up to the 2004 election saw the Liberal Coalition stress its economic management...
*February 9, 2012*

**US Government**

What is a modern day example of separation of powers at work? All I can find is the US government but I need an example of it being used not it being describe. Please help.
*February 8, 2012*

**Math**

What is the range of the following problem? f(x)=(.3)^x+2 is it (2, infinite)?
*February 8, 2012*

**Economics**

If someone said "My personal economic theory is live below my means..." what does this mean and what implications does this have for that person's economic future?
*February 8, 2012*

**physics**

An object (point mass) is projected up an inclined plane from the bottom with an initial speed of 5.0 m/s. The plane is 0.75 m high and the coefficient of kinetic friction between the object and the plane is 0.25. For what angle of inclination would the mass just come to rest ...
*February 6, 2012*

**Science**

Why do seas provide habitats with minimum temperature variation? How does turbulence of water influences the availability of gases? I read that jellyfish have form in water but collapses into a mass when placed on land, why is that? Its not really Homework i just read it from ...
*February 4, 2012*

**latin american history**

I'm trying to sum up the key policies of Juan Peron. Can you help me? I've had no luck with the internet.
*February 3, 2012*

**Chemistry**

Why is Mo(II)nitride = MoN3 and not M02N3 Also Why is PbO2 not Pb2O4 Thanks You!
*February 1, 2012*

**statisticas**

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ____
*January 28, 2012*

**Physics**

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.71 x 105 N/C during the first 5.49 cm of the tube's length; then they move at essentially constant velocity another 47.9 cm before hitting the screen. Find the ...
*January 26, 2012*

**physics**

Some forms of cancer can be treated using proton therapy in which proton beams are accelerated to high energies, then directed to collide into a tumor, killing the malignant cells. Suppose a proton accelerator is 4.21 m long and must accelerate protons from rest to a speed of ...
*January 26, 2012*

**trig**

not sure how to simplify tan(t+pi)/sin(t+2pi)
*January 24, 2012*

**Math**

1.89 x 10^6
*January 24, 2012*

**physics**

What is the pressure in Pascals exerted on a surface measuring 0.5 m^2 by a force of 125 N?
*January 23, 2012*

**info literacy**

what is the publisher and the number of pages for Ellison's 2002 edition of Invisible Man.
*January 21, 2012*

**physics**

A ball is thrown from a cliff upward with a speed of 20 m/s, the angle is 33 degrees and the ball hits the ground 9.2 seconds later, how high is the cliff to the nearest meter?
*January 19, 2012*

**physics**

A ball is thrown from a cliff upward with a speed of 21 m/s and at an angle of 56 degrees to the horizontal. How high does it go above the cliff to the nearest tenth of a meter?
*January 19, 2012*

**physics**

a baseball is thrown horizontally off a cliff with a speed of 27 m/s. How far has it fallen to the nearest tenth of a meter in 5.2 seconds?
*January 19, 2012*

**Physics**

a car accelerates at a constant rate from zero to 26.7 m/s in 10 seconds and then slows to 19 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s^2 during the 15 seconds?
*January 13, 2012*

**Physics**

how far to the nearest tenth of a meter can a runner running at 7.9 m/s run in the time it takes a rock to fall from rest 65 meters?
*January 13, 2012*

**english**

Can someone please check my little brothers work, trying to help him out.
*January 9, 2012*

**english**

Could someone check my answers please?From "When Grees Meets Greek" 1) What can you conclude from the wording of the following text? "One morning Ramkilawansingh(after this, we calling this man Ram) was making a study of the noticeboards along Westbourne Grove ...
*January 9, 2012*

**physics**

A(n) 5 g bullet is ﬁred into a 249 g block that is initially at rest at the edge of a frictionless table of height 1.7 m. The bullet remains in the block, and after impact the block lands 1.6 m from the bottom of the table. The acceleration of gravity is 9.8 m/s Find ...
*January 6, 2012*

**physics**

A(n) 5 g bullet is ﬁred into a 249 g block that is initially at rest at the edge of a frictionless table of height 1.7 m. The bullet remains in the block, and after impact the block lands 1.6 m from the bottom of the table. The acceleration of gravity is 9.8 m/s Find ...
*January 6, 2012*

**physics**

A(n) 11 g bullet is ﬁred into a(n) 111 g block of wood at rest on a horizontal surface and stays inside. After impact, the block slides 14 m before coming to rest. The acceleration of gravity is 9.8 m/s If the coeﬃcient of friction between the surface and the ...
*January 6, 2012*

**physics**

A(n) 11 g bullet is ﬁred into a(n) 111 g block of wood at rest on a horizontal surface and stays inside. After impact, the block slides 14 m before coming to rest. The acceleration of gravity is 9.8 m/s If the coeﬃcient of friction between the surface and the ...
*January 6, 2012*

**science physics**

i dont get how to solve this please help me Two resistors, 47 Ù and 82 Ù, are connected in series across a 45 V battery. What is the current in the circuit?
*January 5, 2012*

**math**

Find the coordinates of th vertex and write the equation of the axis of symmetry given the function f(x)=-x^2-3x-2.Is the vertex a maximum or a minimum?
*December 8, 2011*

**math**

Find the coordinates of th vertex and write the equation of the axis of symmetry given the function f(x)=-x^2-3x-2.Is the vertex a maximum or a minimum?
*December 7, 2011*

**Phones**

Lists of brands of phones
*December 6, 2011*

**math**

Divide the rectangles by tens and ones for each factor. Find the number of squares in each smaller square. Then add the numbers of the squares in the four rectangles : 200+40+40+8=288 So, 12x24 =288
*December 5, 2011*

**trig**

if the terminal ray of an angle 0 in standard position passes through the point (-1,3),then cos0=
*December 5, 2011*