Saturday

April 19, 2014

April 19, 2014

Total # Posts: 580

**Global History**

Vietnam was not originally what France primarily wanted. Explain the value of Vietnam at the time. The time period is around the Vietnam war!

**MATH**

A photograph has been enlarged to three times its previous size. By what percentage has the size of the photograph increased?

**Chemistry**

Compare the physical and chemical properties of acids and bases.

**Chemistry**

Element P electron configuration is 2-8-8-1 Element Q electron configuration is 2-8-18-7

**Health**

Explain how homelessness is a health-related social issue.

**Chemistry**

Explain how a person bailing out a row boat with a leak could represent a state of physical equilibrium.

**math**

Input output table like this 0 in no output 2/3 in 17/6 out 11/4 in ? Out 3 in 13/3 out - in 13/2 out ?

**Science**

Thanks you very very much !

**Science**

How are are the viruses, bacteria, fungi, and protists similar? are the all living things or only visisble to through a microscope or infectious diseases??

**social studies**

Which of the following statements about the natural resources of the United States is most accurate? A. The many agricultural resources of the United States have made up for its lack of other resources. B. U.S. industry and agriculture have prospered because America has many d...

**LANGUAGE ARTS**

what is number 2 and 3

**5th Grade Math**

Complete the knput output table write the rule. 0 in - out 3/2 in 17/6 out 11/4 in - out 3 in 13/3 out - in 13/2 out i don t understand

**Physics**

A baton twirler tosses a baton into the air with an initial angular velocity of 2 rev/s (revolutions per second). The baton undergoes a constant angular acceleration of -.015 rev/s^2 while in the air, and its angular velocity when she catches it is .8 rev/s. Determine the numb...

**Calculus II**

Wow this problem is easier than I thought it was. Thanks.

**Calculus II**

A cable that weighs 1.5 lb/ft is used to lift 700 lb of coal up a mineshaft that is 400 ft deep. Find the work done.

**Thomas Nelson **

What is chromatin?

**Chemistry Hess's Law **

(1) 2 Ni(s) + O2 (g) --> 2NiO(s) delta H= -479.4 kJ (2) Ni(s) + Cl2(g) --> NiCl2(s) delta H= -305.3 kJ Using equations 1 and 2 and Hess's Law, determine the amount of moles Nickel (ii) Chloride that was combusted given the following: volume = 15.45 L pressure = 2.29 ...

**math**

Verify the given linear approximation at a = 0. Then determine the values of x for which the linear approximation is accurate to within 0.1. (Enter your answer using interval notation. Round your answers to three decimal places.)

**Math**

Solve for a and b. 2a-ai-5b=0, a-2b-bi=0. Where i is complex number.

**Math**

Solve x^2+1=0.

**Math**

Solve x^2+1=0.

**social studies**

According to the majoritarian model of democracy, what role should public opinion play?

**physics**

A bullet was fired horizontally from the top of a 1.5x10^2 m tall tower at 2.8x10^2 m/s. Determine its speed on impact with the ground below.

**math**

Use the formula t = (0.25) s1/2 to find the time t in seconds it will take a stone to drop a distance s of 200 feet. Round your answer to the nearest tenth of a second.

**ap chemistry**

How would you find the remaining mass of the excess reagent?

**physics**

A rocket is used to place a satellite in orbit about a planet. The velocity of the satellite is 534 m/s and the radius of orbit is 1.21×108 m. What is the mass of planet?

**macroeconomics**

b. Now suppose that the gross national debt initially is equal to $2.5 trillion and the federal government then runs a deficit of $100 billion: i. What is the new level of gross national debt? ii. If 100 percent of the deficit is financed by the sale of securities to the publi...

**Finite math**

The manager of a money market fund has invested $4.2 million in certificates of deposit that pay interest at the rate of 5.4%/year compounded quarterly over a period of 5 years. How much will the investment be worth at the end of 5 years?

**fnite math**

Juan invested $24,000 in a mutual fund 5 years ago. Today his investment is worth $34,616. Find the effective annual rate of return on his investment over the 5-year period.

**physics**

I solved and got 0.399m and that was wrong, so I don't know...

**physics **

I'm really confused on this problem too. Does anyone understand how to do it?????????

**social question**

how much gas do you use to travel 172 miles at 4.00 a gallon.

**social question**

how much gas do you use to travel 172 miles at 4.00 a gallon.

**Physics**

Two charges +q and −q are separated by a distance d=50 cm. The electric field lines for this system form the the well-known pattern showed in the figure below. Consider two lines L1 and L2 lying on the same plane and leaving the positive charge at α=±45∘...

**Math**

Six people are playing Secret Santa for Christmas. They will each give one gift to someone, and each receive one gift from someone. They are not allowed to receive their own gift. How many different ways are there to exchange gifts?

**Math**

Find an equation for the line that contains the points (2, -3) and (6, 9).

**Calculus**

ç1 0 x^2dx=1/3. Use this and the properties of integrals to evaluate ç1 0 10−2x^2dx

**Calculus**

A piece of wire 40 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral triangle. How should the wire be cut so that the total area enclosed is a maximum= minimum= Find the length of the wire used

**Chemistry**

For a solution of 3.3 M H2CO3 (Ka = 4.4 × 10-7), calculate: (a) [H+] ____?______M (b) pH _____??______ (c) percent ionization ______?______%

**Math**

What is 1 5 of 20

**Urgent math**

If f(x, y, z)=sin(3x-yz), where x=e^(t-1), y=t^3, z=t-2, what's df/dt(1)? x(1)=1 y(1)=1 z(1)=-1 df/dt=(3cos(3x-yz))(e^(t-1))+(cos(3x-z))(3t^2)+(cos(3x-y))(1) I seriously need help on this and tell me the answer and show your work through steps. Thanks.

**Algebra**

A chain store manager hs been told by the main office that daily profit, P, as related to the number of clerks working that day, x, according to the functions P=-25x^2 + 300x. What number of clerks will maximize teh profit, and what is the maximum possible profit?

**Calculus**

Estimate ç 6 0 6−x^2 dx using 3 right rectangles

**Calculus**

Estimate ç 6 0 6−x^2 dx using 3 left rectangles.

**physics**

An aluminum wing on a passenger jet is 38 mlong when its temperature is 23°C.At what temperature would the wing be 2 cm (0.02 m) shorter?

**Chemistry**

A compound containing only carbon, hydrogen and oxygen is subjected to elemental analysis. Upon complete combustion, a .1804g sample of the compound produced .3051g of CO2 and .1249g of H2O. What is the empirical formula of the compound?

**Chemistry**

What is the wavelength of an electron traveling at 7.59% of the speed of light?

**Chemistry**

How many valance electrons are there in [(C2H5)4N]+ ?

**Chemistry**

What is the C-C-H bond angle in the molecule H2CCO?

**Chemistry**

What type of reaction will occur when an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate?

**Analytical Chemistry**

Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 291 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.7 mM Lithium standard was added to 9.00 mL of ...

**Physics**

Dry air will break down if the electric field exceeds about 3.0 × 106 V/m. What amount of charge can be placed on a capacitor if the area of each plate is 6.7 cm2?

**physics**

The two plates of a capacitor hold +3200 µC and -3200 µC of charge, respectively, when the potential difference is 700 V. What is the capacitance?

**Calculus I, differentiation**

The number, N, of people who have heard a rumor spread by mass media by time, t, is given by N(t)=a(1−e−kt). There are 6 million people in the population, who hear the rumor eventually. If 5% of them heard it on the first day, find the percentage of the population ...

**Physics**

Betty weighs 427 N and she is sitting on a playground swing seat that hangs 0.22 m above the ground. Tom pulls the swing back and releases it when the seat is 0.88 m above the ground. The acceleration of gravity is 9.8 m/s2. How fast is Betty moving when the swing passes throu...

**invest**

You budget $100 for parking each month. Each day you use the downtown parking lot, it costs you $5. Write a rule to represent the amountof money left in your monthly budget as an arithmetic sequence. How much money is left in your budget after you have used the downtown parkin...

**Algebra**

invest $ 3000 and save $100 each month. Write a rule to represent the total amount of money invest into your account as arithmetic sequence. How much money will you have invested after 12 month?

**Physics**

A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...

**Differential Equations**

y'=2x+y. Find a solution whose graph is also an isocline.

**Physics**

A cannon is mounted on a truck that moves forward at a speed of 5 m/s. The operator wants to launch a ball from a cannon so the ball goes as far as possible before hitting the level surface. The muzzle velocity of the cannon is 50 m/s. What angle from the horizontal should the...

**Life oreintation**

What according to the basic conditions of employment act applies with regard to the contraventions

**Physics PLEASE HELP!**

Youre summing forces so mg is force due to gravity g=9.8 There are three forces, kx the spring mg gravity and qE the field force

**Physics**

40.6 m/s 1.3 s -26 degrees

**World history; HELP**

Didn't you learn to read a textbook instead of asking online for homework answers?

**Psychology**

Human relations are universal, but those defined as basic or primary are: a. the same from culture to culture b.defined differently in different cultures

**Calculus **

Use the graph of f(x)=x^2/(x^2-4) to determine on which of the following intervals Rolle's Theorem applies. A) [0, 3] B) [-3, 3] C) [-3/2, 3/2] D) [-2, 2] E) None of these

**Urgent Math**

f(x)=(x+2)^3-4. The point (-2, -4) is which of the following? A) An absolute maximum B) An absolute minimum C) A critical point but not an extremum. D) Not a critical point E) None of these I think the answer is C, am I right?

**Math**

Use the definition of logarithm to simplify each expression. (a) log6b (6b) (b) log9b ((9b)^5) (c) log10b ((10b)^-8)

**Math**

Evaluate the following expression. (Note, I'm not sure how to write this in mathematical form)but the P is slightly raised above both numbers. 210 P 1 = ______

**Math**

Find the probability whose odds against are given in the problem. Odds against are 5 to 7. Answer is ________.

**Math**

From a survey of 200 college students, a marketing research company found that 130 students owned iPhones, 70 owned cars, and 60 owned both cars and iPhones. (a) How many students owned either a car or an iPhone (but not both)? _______students (b) How many students do not own ...

**Math**

Thank you Ms. Sue!

**Math**

The math problem is set up as a fraction in parenthesis 6 over 4. Evaluate the expression (6/4)

**Urgent Math**

Let f"(x)=4x^3-2x and let f(x) have critical values -1, 0, and 1. Determine which critical values give a relative maximum. A)-1 B)0 C)1 D)-1 and 1 E) none of these

**Physics**

I still don't understand part (a). I know that cos^2(90)=0 but how did you get to the answer of 2 sheets?

**Physics**

I don't really know. I did ln(1/100)=-4.605 and ln(cos(90)^2)=-1.605 and 4.605/1.605=2.869. The answer for part (a) should be 2 but 2.869 is closer to 3 so am I doing anything wrong?

**Physics**

We want to rotate the direction of polarization of a beam of polarized light through 90 degrees by sending the beam through one or more polarizing sheets.(a) What is the mini-mum number of sheets required? (b) What is the minimum number of sheets required if the transmitted in...

**Physics**

We want to rotate the direction of polarization of a beam of polarized light through 90 degrees by sending the beam through one or more polarizing sheets. (a) What is the mini-mum number of sheets required? (b) What is the minimum number of sheets required if the transmitted i...

**Physics **

A small spaceship whose mass is 1.5x10^3 kg (include-ing an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 10 kW laser beam, what speed will the ship attain in 1.0 day because of the momentum carried away by...

**Physics**

Some neodymiun-glass lasers can provide 100 TW of power in 1.0 ns pulses at a wavelength of 0.26 um. How much energy is contained in a single pulse?

**Physics**

A spaceship at rest in a certain reference frame S is given a speed increment of 0.50c. Relative to its new rest frame, it is then given a further 0.50c increment. This process is continued until its speed with respect to its original frame S exceeds 0.999c. How many increment...

**Physics**

Thank you!

**Physics**

A 5.00-grain aspirin tablet has a mass of 320 mg. For how many kilometers would the energy equivalent of this mass power an automobile? Assume 12.75 km/L and a heat of combustion of 3.65x10^7 J/L for the gasoline used in the automobile.

**Physics**

A spaceship at rest in a certain reference frame S is given a speed increment of 0.50c. Relative to its new rest frame, it is then given a further 0.50c increment. This process is continued until its speed with respect to its original frame S exceeds 0.999c. How many increment...

**Physics**

Thank you so much!

**Physics**

If we intercept an electron having total energy 1533 MeV that came from Vega, which is 26 ly from us, how far in light-years was the trip in the rest frame of the electron? (Answer: 8.7*10^-3 ly)

**Physics**

I got 1*10^-16 but what's the unit for my answer? Because the book says 1.0 ke V is the answer for part (a). How do I get there?

**Physics**

How much work must be done to increase the speed of an electron (a) from 0.18c to 0.19c and (b) from 0.98c to 0.99c? Note that the speed increase is 0.01c in both cases.

**algebra 1**

write the slope-intercept form of the line that passes through (-4-3) and in parrallel to the line t=-1/3x +3

**Chemistry**

Isn't the molar mass 92.09 g/mol? This is what i got with /\T=Kf*m formula. If that's the case then C3H8O3 is the empirical formula and the molecular formula. Correct?

**Physics**

A plant hangs from a 1.9 cm diameter suction cup affixed to a smooth horizontal surface (there's a figure but it's pretty simple, a plant in a plant pot hanging from a couple wires, but what seems to matter is the suction cup part). (a) What is the maximum weight that ...

**Physics**

A spy satellite orbiting at 160 km above Earth's surface has a lens with a focal length of 3.6 m and can resolve objects on the ground as small as 30 cm. For example, it can easily measure the size of an aircraft's air intake port. What is the effective diameter of the...

**physics**

5. A bomber is flying at a height of 9 km at 800 km/h. How far in front of the target should he drop his bombs? show formulas*

**Physics**

Visible light is incident perpendicularly on a diffraction grating of 200 rulings/mm. What are the (a) longest, (b) second longest, and (c) third longest wavelengths that can be associated with an intensity maximum at theta=30 degrees?

**chemistry**

D. The 3+ on Fe3+ tells you how the charge differs from its natural state. Because an electron is a negatively charged particle when one electron leaves, the charge is +1 because the ion still has the same amount of protons with one less electron.

**chemistry**

True. The flouride anion is an ion of fluorine. Fluorine has only one oxidation state, of -1. WHY: Fluorine is the most electronegative element on the periodic table meaning that having an extra electron is very energetically favorable. (It "wants" one electron) In t...

**Algebra**

length of a rectangle is 5y more than twice its width and area of the rectangle is 42 yards ^2, find the dimensions

**math equation**

A chef is preparing a recipe for an upcoming banquet. Normally, he uses 10.25 mL of water, but today, he is using 112.75 mL of water. By how many times did the chef need to increase the recipe? Is this right?? i = variableE Equations 10.25i / 10.25 = 112.75 / 10.25 i = 11 112....

**Math pattern**

3, 125, 625, 125, 25, ??? I am thinking it is 10, 2?

**economics**

Suppose a persona quits a job paying $40,000 per year and starts a business with $100,000 withdrawn from a money-market account earning 8 percent per year. The implicit cost of the business is ____ for the entrepreneurs time plus _____ for the entrepreneurs funds. Can someone ...

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