Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 1,454

**physics**

A 5 meter diameter telescope is used to observe binary star systems. What is the minimum separation distance (perpendicular to the line of sight) for which the two stars can be resolved if they are at a distance of 1,000 light years = 10 m and they are observed in visible ligh...

**physics**

Light shines through a single slit whose width is 1.12 mm. A diffraction pattern is formed on a screen located 4.0 m away. The distance between the middle central bright fringe and the second dark fringe is 4.0 mm. What is the wavelength of the light?

**physics**

A light ray travels from water to air. If the ray strikes the water/air boundary at an angle of incidence of 46 degrees, what is the angle of refractiob in air? (n water = 1.33)

**Physics**

a 59kg student jumped off the back of a 42kg sailboat, the boat was already travelling at 3.1m/s before she jumped. if she jumpped off with a speed of 2 m/s, how fast was the boat moving? thanks for any help

**Science**

Are sunspots cooler or hotter spots in our sun? I think it's cooler

**Science**

What causes day and night? What's the difference between a solar eclipse and a lunar eclipse?

**Science**

How does Earth have seasons?

**Government**

blah

**calculus**

A growing boy who is 4 feet tall stands 8 feet from a 12 foot lamp post. The boy is growing at the rate of 3/4 inches per year. How fast is his shadow growing (in inches per year)?

**physics**

You need to move a 135-kg sofa to a different location in the room. It takes a force of 92 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?

**MATH**

So none of these are correct? 2/3 divided 3/5 = 1 1/9 or 2/5?

**Math**

can you please let me know if these are correct: 1. 5 5/6 x 2 4/5 = 16 2. 2/3 divided 3/5 = 1 1/9 or 2/5? 3. 7/12 divided 2/3 = 7/8 4. 3 1/2 divided 3/4 = 4 2/3 or 2 5/7 5. 4 2/3 divided 7 = 2/3 6. 4 1/5 divided 1 2/5 = 3 7. 2/5 x 5/14 = 1//7 8. 2/3 + 1/7 = 17/21 OR 12/21

**Pre Calculus**

find all solutions of the equation 1. x^3+27=0 2. x^3-8=0

**Pre Calculus**

1. Find all rational zeros of the polynomial. Then determine any irrational zeros, and factor the polynomial completely. 3x^4-11x^3+5x^2+3x 2. Find the polynomial with leading coefficient 1 that has a degree of 4, a zero of multiplicity 2 at x=1 and a zero at x=2+i

**Biology 11**

the genotype of the hybrids of two pure-breeding pea plants that each have white flowers and round seeds (both traits dominant) would be?

**Pre Calculus**

Find a third degree polynomial P(x) that has zeros at x=-1, x=1, x=2 and whose x-term has coefficient 3?

**Chemistry**

A typical buffer used by biochemists is called Tris, which can be depicted as R3N. A buffer that is prepared by mixing 500ml of .05M R3N with 500ml of .05MR3NHCl at 25 C has a pH of 8.40. If this same buffer is placed in a cold room at 4 C the pH increases to 9.2. From this da...

**social studies**

What did the people of ancient Ghana have that the proto-Bantu-speaking people did not? What effects do you think this had on their descendants?

**Physics**

a) Find the acceleration of the block if the incline is frictionless. b)Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.12.

**Physics**

A block of mass m = 5.2 kg is pulled up a è = 24° incline as in the figure with a force of magnitude F = 34 N.

**MATH**

Please help me with these: 1. 5/8 + 5/6 = 2. 2 3/5 + 4 4/5 = 3. 13 1/2 + 7 2/3 = 4. 3/8 - 3/8 = Thanks!

**MATH**

Please help me with these: 1. 5/8 + 5/6 = 2. 2 3/5 + 4 4/5 = 3. 13 1/2 + 7 2/3 = 4. 3/8 - 3/8 = Thanks!

**English**

Are there any tutors on here that are familiar with The Canterbury Tales?

**spanish**

is this past or present tense Mi Papa escribio un cheque

**Math - Calculus III**

Find the double integral of f (x, y) = (x^7)y over the region between the curves y = x^2 and y = x(3 - x).

**Math**

Find the double integral of f (x, y) = (x^7)y over the region between the curves y = x^2 and y = x(3 - x).

**political science **

In need of help on my political science homework please help with these questions Only these questions left! One reason why the US has only 2 major parties is that it has: A. insufficient opportunities to bribe candidates B. too much involvement by religious groups C.single-me...

**Chemistry! HELP;**

An atom of potassium (K) has 19 protons: 18 electrons in its inner electron energy levels and 1 electron in its outer energy level. What is the easiest way for this atom to get a filled outer energy level? What is formed?

**algebra**

can you please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5

**math**

Please help me with these 1. -5/c = 1/3 2. k/8 = -2/5 3. 6/z = -3/5 Thank you

**Botany**

During the last part of cellular respiration in the mitochondrion, electron flow is tapped and used to make ATP. Where do the electrons end up when they are finished flowing?

**Math**

Find the general solution of the equations csc^2 θ =4/3.

**Pre Calculus**

using the factor theorem to show that x-c is a factor of P(X) for the given values of c, and factor 1. P(x)=x3-5x^2+8x-4; c=1

**Pre Calculus**

Exponential growth and decay find the half life of a radioactive substance if 220 grams of the substance decays to 200 grams in 4 years?

**CHEMISTRY PLEASE HELP**

a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the molar mass of an unk...

**CHEMISTRY PLEASE HELP**

Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading: 0.11mL Volume NaOh use...

**CHEMISTRY PLEASE HELP**

Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...

**Chemistry**

Using the data collected for part c on your data sheet and assuming the density of the vinegar is 1.00g/mL, 1) calculate the molar concentration of acetic acid (CH3COOH) in the vinegar sample using the average volume of NaOH. 2) calculate the mass percent of acetic acid in the...

**Chemistry**

Using the data collected for part b on your data sheet, calculate the molar mass of the unknown acid. Include the calculation for each trial and the average. Trial One Results: Mass unknown acid: 0.500g Final buret reading: 18.01mL Initial buret reading: 0.11mL Volume NaOh use...

**Chemistry**

a) How will the concentration of NaOH be affected if during the titration some of the solid potassium hydrogen phthalate was spilled during the transfer? Will the concentration of the standardized NaOH increase, decrease, or have no effect? b) How will the molar mass of an unk...

**statistics**

government data assign a single case or each death that occurs in the u.s. the data show that the probability is 0.45 that a randomly chosen death was due to cardiovascular disease, and 0.22 that i was due to cancer. Suppose a docote checked the cause of death of 2 randomly se...

**Pre Calculus**

Inverse functions what is the inverse function of f(x)=1/square root of x +1? and f(x)=1-x^2, x<0?

**Pre Calculus**

Exponential and log functions What initial investment at 8.5% compounded continuously for 7 years will accumulate to 50,000?

**Pre Calculus**

Inverse functions find the value If f(x)=1/x, find f^-1 (2)

**Pre Calculus**

Exponential Growth and Decay Find the half-life of a radioactive substance that decays by 5% in 9 years.

**Pre Calculus**

Logarithms Solve the equation for x 1-ln(3x+2)=0

**Pre Calculus**

Applications of trigonometric functions Solve the missing parts of the triangle satisfying a=125 b=150 alpha=55 degrees There are two solutions

**Math**

I have input x (20,1,40,4,8,10) and output y (2,40,1,10,5,4). What is the function?

**Calculus**

Using Law of Sines: Need Help 1. alpha=70 Degrees Beta=38 Degrees a=35

**math**

58 cm times 55.6. try to find the area for this problem

**Physics**

Two blocks are at rest on a frictionless, 20 degree incline. What are the tensions in the two strings if block 1= 5.3kg and block 2= 2.4kg?

**Physics**

Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. What is the tension in the string connecting block 108 to block 107?

**Physics**

Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. What is the tension in the string connecting block 108 to block 107?

**algebra**

I NEED HELP SOLVING THIS PROBLEM WX/P + P/X = PLEASE EXPLAIN AND SHOW HOW TO SOLVE W = 3.5, X = .4, P = 2.6

**Calculus**

solve this equation on the given interval expressing the solution for x in terms of inverse trigonometric functions. 6(cosx)^2-cosx-5=0 on (pie/2, pie)

**physics**

Each of 108 identical blocks sitting on a frictionless surface is connected to the next block by a massless string. The first block is pulled with a force of 108N. Part A. What is the tension in the string connecting block 108 to block 107? Part B. What is the tension in the s...

**Chem**

A lake may be polluted with Pb2+ ions. what precipitation reaction might you use to test for the presense of Pb2+?

**Physics**

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at 15.0 m/s 2 . At t1 the rocket engine is shut down and the sled moves with constant velocity v for another t2 s. The total distance traveled by the sled is 5.60 × 10 3 m and ...

**trig**

5 and 6

**math**

write the unit rate of2 into 50

**math**

type 8580 words in 2hrs and 45mins

**math**

Fator the trinomial: 4) 2 p + 10p +25 6) 2 y - 5y -24 8) 2 n + 2n -48 10) 2 y + 17y + 72 = 0 12) 2 w - 13w + 42 = 0

**Spanish SRAJMcGIn please recheck**

Please recheck my above posting-thank you

**Spanish -another question**

I'm sorry but I don't understand about #5-I should have written it as I could almost reach it so it would be Prefiero esa sepiete. Is that correct? Were the others correct I guess my closest is this/these My far away is you can almost reach them and my fathest would be...

**Spanish -another question**

Correction-Number 5 should be Prefiero esa serpiente. Correct because its feminine?

**Spanish -another question**

I'm working on distances like saying something is closest far away or furthest. Are these correct for what I put in English as the closest far away or furthest- 1.furthest away- Preferiero aquella arana.(accent over n) 2.far away-Prefiero esa gallina. 3. far away-Prefiero ...

**Spanish**

Thanks-appreciate it

**Spanish**

Change the verb in each sentence to the present participle. 1.Tú nadas. Tú estás nadando. 2. Él bebe café. Él está bebiendo café.

**Science**

8===))

**Physics**

A car is traveling 28 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.0 m/s2. How far does the car go before it stops?

**Math**

50

**Pre-Calc**

That is so easy-I can't believe I was screwing it up so badly-Thank you

**Pre-Calc**

Please help me with this problem-I'm stuck (x-2)/(x+2) = (x+10)/x I'm not even sure where to start-Thanks for any help you can provide

**Trigonometry**

Solve. 2sin(2ƒÆ) + ã3 = 0 interval [0, 2ƒÎ) How do I start this? I feel like maybe Trig Identities, but I'm not really sure.

**Math trig.**

find the length of the arc intercepted by a central angle of 35 degree 28' in a circle of radius 15ft....i cant figure out how to get it ??

**math**

HOW TO SIMPLIFY 7 6/24?

**physics**

A small rock is thrown vertically upward with a speed of 13.0 from the edge of the roof of a 31.0 tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected What is the speed of the rock just before ...

**Government**

The Principle of self-government emphasizes majority rule whereas the principle of liberty emphasizes individual rights. There principles A. are universal and are the foundation of all legitimate governments. B. have no real meaning in practice. C. have the same meaning for al...

**Math**

Evaluate if r=-8: |-15-r|+|r|=

**chemistry**

1.1

**algebra**

Factor: A.) 2x^2-9x-18 B.) 14x^2-55x-36 C.) x^3+3x^2-x-3

**physics**

A student uses a sonic motion detector to determine the position of a car at various times. The student takes five positions at five different times. The student's data is represented below: Time t [s] Position x [m] 0.5 39.9 1.4 75.4 2.9 139.3 3.7 186.5 4.1 193.2 (a) Plot...

**physics**

An object moves to the right according to the equation x = 4t2 + 3t + 16 where x is in meters and t is in seconds. Determine the object's average velocity between time t = 0 and time t = 4 seconds.

**science**

1. what weight in grams of magnesium oxide will produce from burning 96 grams of magnesium? 2. a solution containing 252g of calcium sulfate will produce from 165lbs of phosphate rocks containing 82.5 % pure calcium phosphate treated with sulfuric acid? 3. how many tons of qui...

**Calculus**

find tha value of f(x)=x3 where f(x+h)-f(x)/h so far I got 3x2+3hx+h2/h and got stuck from here.

**science**

1. What weight of aluminum may be obtain from 1 kg of aluminum oxide? 2. how many liters of hydrogen would be form by the reaction of 25g of hydrochloric acid and sufficient quantity of zinc? 3. 0.82l of an unknown gas at 35 degree Celsius and 80 cm-Hg weigh 2.46g. compute for...

**Calculus**

I am having trouble with these 2 problems. Evaluate: (1/x^9)dx Evaluate: (5x^5-4x^3+6x)dx

**Calculus**

Sorry, I typed wrong. The equation is (3x^4-2x^3+7x)/x^4+14x-2

**geometry**

find the value of b if jm = b and ml = 3b-4

**statistics**

A researcher is interested in studying people’s mean age in a certain region. If the population standard deviation is known to be 8 years and 1.5 year of error margin is allowed, find the minimum simple size the researcher needs to use, knowing that he is going to conduct...

**biology**

what is the difference between a chemical that is an irritant compared to a chemical that is corrosive?

**Web Design**

how has the internet changed since 1980?

**Calculus**

put function in standard form f(x)=-4x^2-32x+9

**Calculus**

put in standard form: 4x^2=36+9y^2

**Calculus**

If $22,550 is invested at 2.95% compounded continuously, how long will it take to reach $50,000 in the account?

**Calculus**

8-3i divided by -4-6i=

**Calculus**

Need help with this complex number equation. 8-3i/-4-6i=

**Calculus**

how to convert this from rectangular to polar? r=cos theta

**Math**

Use Mathematical Induction to show that the statement 2 + 6 + 10 + . . . + (4n – 2) = 2n^2 is true

**Calculus**

How can I convert polar coordinates to rectangular coordinates?

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