Saturday

April 19, 2014

April 19, 2014

Total # Posts: 562

**math**

what does sin2x/cos2x equal to?

**Physics please help ASAP!**

If you know the mass of a star and a planet’s radius and speed at perihelion (closest approach to the star), then using conservation of energy and angular momentum you can solve for the radius and speed of that planet at aphelion (farthest point from the star). Encke’...

**please help asap!**

A ladder, 5.0 m long, leans against a frictionless wall at a point 4.0 m above the ground. A painter is climbing up the ladder. The mass of the ladder is 12.0 kg and the mass of the painter is 60.0 kg. The ladder begins to slip at its base when the painter is 70 % of the way u...

**physics please help!!**

A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. (A & B are 1 met...

**Physics**

Please help!

**Physics**

A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. A and B are 1m ...

**math**

xy = 5 a) Identify each relationship as direct or inverse variation. b) Calculate the constant of each relationship and explain how you arrived at your answer. c) Using complete sentences, explain how the two relationships are different, and how they are similar.

**Calculus**

A ladder 25 feet long that was leaning against a vertical wall begins to slip. Its top slides down the wall while its bottom moves along the lever ground at a constant speed of 4 ft/sec. How fast is the top of the ladder moving when it is 20 feet above the ground?

**Science**

Classify reaction as addition, displacement, or decomposition: Al(s)+NaOH(aq)=Al(OH)3(s)+Na+(aq)

**Physics**

An 80 kg hiker climbs a 1000 m high hill at a constant speed. If the hiker's body is 25% efficient, how many kg of fat does the hiker burn in climbing the hill? Given: heat of reaction of body fat is 37000 kilo joules per kilogram. I know that change in potential energy is...

**Physics**

If you have swam one lap in a swimming pool, that means you have swam from one end to the other and back. In 4.5 h, a swimmer makes exactly 69 laps in a swimming pool that is 35 m long. Determine the distance the swimmer traveled, the total displacement of the swimmer, the swi...

**Math**

Find an equation for the line that passes through the point (2, -5) and has slope -3

**math**

PLEASEEE HELPPP Evaluate exact values, if they exist? if any doesn't exist state so. a) (in randians) sin^-1(-1/√2)

**economics**

The demand curve for knobs is P=75-6QD and the supply curve for knobs is P=35+2QS. What is the equilibrium price of a knob?

**math**

whats the derivative of lnx?

**math**

show that the equation x^3-15x+c=0 has at most one root on the interval [-2,2.

**biology**

An individual with the genetic condition cystic fibrosis has CFTR protein with the amino acid histidine (at position 482), where the normal CFTR protein has arginine. (No other changes are observed in the protein.) This is the result of a _________ mutation. Select one: a. Non...

**biology**

Which of the following is NOT true of transcription / translation processes in both bacteria and eukaryotes? Select one: a. RNA polymerase reads the template DNA strand to produce the complementary mRNA transcript. b. Translation of a polypeptide can occur before transcription...

**biology**

Gene expression regulation by methylation of the cytosines in a promoter would be considered : Select one: a. Transcriptional regulation. b. Posttranscriptional regulation. c. Posttranslational regulation. d. Translational regulation.

**chemistry**

how do u hybridize for sulfate (SO4 -2)?

**PHYICS**

A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 470 N and have a center of gravity that is 1.13 m above the floor. His upper legs weigh 108 N and have a center of gravity that is 0.755 m above the floor. Finally, his lower legs and ...

**Phyics**

A 49-N crate is suspended from the left end of a plank. The plank weighs 21 N, but it is not uniform, so its center of gravity does not lie halfway between the two ends. The system is balanced by a support that is 0.30 m from the left end of the plank. How far to the right of ...

**Phyics**

A uniform board is leaning against a smooth vertical wall. The board is at an angle above the horizontal ground. The coefficient of static friction between the ground and the lower end of the board is 0.710. Find the smallest value for the angle , such that the lower end of th...

**chemistry**

HELPPPP!!!! A mixture is prepared using equal masses of the two volatile liquids benzene, C6H6, and ethanol, C2H5OH. What is the mole fraction of benzene in this mixture?

**phyics**

A person who weighs 829 N steps onto a spring scale in the bathroom, and the spring compresses by 0.538 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses the spring by 0.390 cm?

**phyics**

The figure shows a person whose weight is W = 500 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.

**phyics**

The figure shows a person whose weight is W = 500 N doing push-ups. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this position.

**phyics**

A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 470 N and have a center of gravity that is 1.13 m above the floor. His upper legs weigh 108 N and have a center of gravity that is 0.755 m above the floor. Finally, his lower legs and ...

**phyics**

One end of a meter stick is pinned to a table, so the stick can rotate freely in a plane parallel to the tabletop. Two forces, both parallel to the tabletop, are applied to the stick in such a way that the net torque is zero. The first force has a magnitude of 2.00 N and is ap...

**phyics**

You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 65 N·m. Using the data in the figure, determine the magnitude F of the force that you must exert on the wrench.

**phyics**

The steering wheel of a car has a radius of 0.19 m, and the steering wheel of a truck has a radius of 0.26 m. The same force is applied in the same direction to each steering wheel. What is the ratio of the torque produced by this force in the truck to the torque produced in t...

**Chemistry**

The protective action of ozone in the atmosphere comes through ozone's absorption of UV radiation in the 230 to 290 nm wavelength range. What is the energy, in kilojoules per mole, associated with radiation in the wavelength range?

**science**

Calculate the weight of a person with a mass of 67 kg that is holding a 12 kg box on earth

**math**

you just subtract the two.. it is telling you he drove x miles in one year then x miles is another.. what is the difference

**algebra**

a painter charged $320 to paint two walls taht measure 12 feet by 9ft and two walls that measured 10 ft by 9 ft. The client asks him to return to paint two walls that measue 15 ft by 12 ft and two walls that measure 18.5 feet by 12 ft. If the painter charges the same rate, wha...

**algebra 1**

Tell whether the sequence is arithmetic. If the sequence is arithmetic, write a function rule to represent it. 12, –9, 6, –3, ...

**math**

one mile is 5280feet.justin has a stride of 32inches .how many steps will he take to run a 26 mile marathon?

**physics**

Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 69.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part (b)?

**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.31 m/s. The car is a distance d away. The bear is 18.6 m behind the tourist and running at 8.01 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

**physics**

The Space Shuttle travels at a speed of about 5.45 x 103 m/s. The blink of an astronaut's eye lasts about 111 ms. How many football fields (length = 91.4 m) does the Space Shuttle cover in the blink of an eye?

**eng**

what is a thesis?

**Chemistry**

What concentration of the salt NaC2H3O2 must be added to shift the equilibrium toward the reactants so that the [H3O+] concentration is reduced to pH = 5.4? Ka=1.8E-5

**Science**

Two parents have three children. They have two girls and one boy. What is the probability that the next child will be a boy?

**7th Grade Language Arts ~!!!!**

1. Sentence fluency can be achieved by _______________. (1 point) (1 pt) adding appropriate transitions (0 pts) using technical terms (0 pts) avoiding long quotations 1 /1 point 2. In order to establish the most appropriate voice in a research report, you should consider _____...

**7th Grade Language Arts ~!!!!**

1. Sentence fluency can be achieved by _______________. (1 point) (1 pt) adding appropriate transitions (0 pts) using technical terms (0 pts) avoiding long quotations 1 /1 point 2. In order to establish the most appropriate voice in a research report, you should consider _____...

**7th Grade Language Arts ~!!!!**

1. Sentence fluency can be achieved by _______________. (1 point) (1 pt) adding appropriate transitions (0 pts) using technical terms (0 pts) avoiding long quotations 1 /1 point 2. In order to establish the most appropriate voice in a research report, you should consider _____...

**7th Grade Language Arts ~!!!!**

1. Sentence fluency can be achieved by _______________. (1 point) (1 pt) adding appropriate transitions (0 pts) using technical terms (0 pts) avoiding long quotations 1 /1 point 2. In order to establish the most appropriate voice in a research report, you should consider _____...

**Science**

If one light bulb was removed in a circuit I think the others will go out because it is incomplete is this right? I will the remaining lights powered by a 9 volt be dim? I am not sure? I think go black dark because its incomplete.

**Science**

Thank you! I will read the link and study. Might have other questions maybe.

**Science**

I guess if all four switches were turned on.Would just just silver ? Why wouldn't yarn? I understand wood when it is wet that makes sense.

**Science**

Can wood, silver or yarn light up a light bulb? I think wood can carry a current.

**history**

How did Enlightenment thinkers attempt to apply the techniques of the Scientific Revolution to human political and social organizations?

**physical**

Sanchez Mr Potato? Q

**science**

web physiology? lol due tmrw?

**math question**

thank you

**math question**

Why is 6/8 not equivalent to 18/32 ??

**physics**

heading due north at 6.00 m/s relative to the water. The local ocean current is 1.53 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?

**physics**

a 40 kg high jumper leaves the ground with a speed of 6m/s. how high can he jump ?

**physics**

a 65 kg student, starting from rest , slides down an 8 meter high water slide. how fast is he going at the bottom of the slide ?

**health**

Oh my bad i meant D!

**health**

To keep a positive attitude on the job, you should A. look for the perfect company—this will ensure everything will be all right. B. complain about the things that bother you so they can get straightened out. C. encourage others to help you with your work. D. look for th...

**music**

Einstein on a Beach was a unique opera because it A. had a single violinist. B. was exclusively recitative. C. was written in Chinese. D. had no plot and very little singing. Is it C?

**music**

. Beethoven's greatest psychological challenge as a composer was A. coping with his worsening deafness. B. the unrealistic expectations of his patrons. C. his resistance to finishing works he had started. D. overcoming his own perfectionism.

**music**

The composer utilized the minor mode in Symphonie fantastique to represent A. joy and love. B. gloom and ferocity. C. solemnity and brilliance. D. earthiness. I'm thinking B .

**music**

Oh so its C!

**music**

Which of the following works helped to redefine the symphony as a genre? A. Beethoven's Sixth Symphony B. Beethoven's Fifth Symphony C. Symphonie Fantastique D. Beethoven's Ninth Symphony Im thinking its B, right?

**music**

i think its D , is that right?

**music**

In a shift from earlier thinking, the social status of nineteenth-century composers became equivalent to that of A. lords and courtiers. B. tailors and hatters. C. woodworkers and carriage builders. D. painters and poets.

**everything**

If you work in a hospital or doctor's office and assign numeric values to procedures and diagnoses for the purpose of reimbursement, you are a A. coding specialist B. medical assistant C. receptionist D. transcriptionist

**life**

The first antibiotic was made because of properties discovered in a certain type of A. spider. B. mold. C. blood. D. herb.

**health**

If you work in a hospital or doctor's office and assign numeric values to procedures and diagnoses for the purpose of reimbursement, you are a A. coding specialist B. medical assistant C. receptionist D. transcriptionist

**health**

Combining two or more segments of the industry to deliver the best care, at the most cost-effective rate, in the best setting refers to a/an A. integrated delivery system. B. diagnosis-related group. C. health maintenance organization. D. preferred provider organization system

**Math**

a. Express f(x)=x^2 - 6x + 14 in the form f(x)=(x-h)^2 + k, where h and k are to be determined. b.Hence, or otherwise, write down the coordinates of the vertex of the parabola equation y=x^2 - 6x + 14.

**math**

determine the radius of convergence of the power series: Σ(n=1 to inf) [(2^n * n! * x^n)/ n^n]

**math,algerbra**

area of circle is given by equation: A = pi*r^2 , where A is area pi is 3.14 r is radius 2) A = pi*(11.5^2) = 3.14*(11.5^2) = ? 3) radius is half the diameter d so r = 3.5 /2 = 1.75 Then area is, A = pi*(1.75^2) = 3.14*(1.75^2) = ?

**Science**

Write a paragraph explaining why a color-blind man who has three daughters and one son with normal color vision might have two grandsons who are color-blind. Use the terms in the vocabulary box in your answer. Underline each term. genotype recessive phenotype dominant allele g...

**math**

there is not 5 numbers...although there is this: 1+3+5+5+17+19 = 50 one number is repeated twice other than that there is no solution

**physical science**

if 34,560 j of work was done with a force of 960 n, how far was the object moved?

**Physics**

If each tire of an automobile has an area of .026 square meter in contact with the ground, the weight of the automobile is 26,000 N, what is the pressure in the tires? Please show work.

**Physics**

An aluminum bar has the desired length when at 10 degrees Celsius. How much stress is required to keep it at this length if the temperature increases to 33 degrees Celsius?

**math**

1/7[4ln(x+9)-lnx-(x^2-25)]

**Statistics**

Sooo...I see you are having problems with this too! LOL

**math**

Jim has grades of 84, 65, and 76 on three math tests. What grade must he obtain on the next test to have an average of exactly 80 for the four tests?

**Math**

Seoul,South Korea

**Math**

Janice wants to know the total number of games won by the Denver Nuggets basketball team over the three seasons shown in the table. What expression should she simplify? Explain how she can use mental math and the properties (Associative, Commutative, Distributive, or Identity)...

**History**

William Shakespeare recorded early English History as a historian for the Tudor line True False

**Pre cal**

Three digits are randomly selected without replacement for one 1, two 9's and one 6. What is the possibility that the three digit number is a multiple of 3?

**calculus 2 **

Find the volume of the solid formed by rotating the region enclosed by y=e^(5x) , \ y=0, \ x=0, \ x=0.8 around the y-axis Please help, i have been attempting these problems for a couple of days

**Math**

How Do I Do An Expanded Algorithm For 23x17 ?

**algebra**

$16 added to an amount of money saved,s, then spent equally on 3 items what does the expression mean?

**calculus 2 **

Justify, with a written explanation or a mathematical reasoning and with a sketch of at least two different cases, the following properties of integrals: a) If f(x) is less than or equal to g(x) for a<=x<=b then integrate from a to b of f(x)dx is less than or equal to in...

**math, calculus 2**

how did you get the -4 in your first step? i dont understand where that came from

**math, calculus 2 **

Consider the area between the graphs x+y=16 and x+4= (y^2). This area can be computed in two different ways using integrals. First of all it can be computed as a sum of two integrals integrate from a to b of f(x)dx + integrate from b to c of g(x)dx What is the value of a, b, c...

**Math **

Decide whether to integrate with respect to x or y. Then find the area of the region: 2y=5sqrt(x), y=4, and 2y+2x=7.

**Chem**

If a rock climber accidentally drops a 56-gram piton from a height of 375 meters, what would its speed be before striking the ground? Ignore the effects of air resistance.

**Physics **

For the three vectors A+B+C= -1.4i. Vector A is 4i and vector C is -2j. Write vector B as components separated by a comma. What is the magnitude of vector B? How many degrees above the negative x-axis does vector B point? Measure the angle clockwise from the negative x-axis.

**math **

Let s(t) represent the position of a particle at time t, v(t) is the velocity and a(t) is the acceleration. What is the value of v(9) for the following: Given that the acceleration of the particle at time t is a(t) = -3t^2+ 3t + 10 and that its position when t = 1 is s(1) = 1 ...

**math, calculus 2 **

Use part 1 of the Fundamental Theorem of Calculus to find the derivative of g(x)= integrate from 9x to 4x of ((u+4)/(u-1))du

**math, calculus 2 **

Consider the function f(x)=-((x^2)/2)-9. In this problem you will calculate integrate from 0 to 3 of ((-x^2)/2)-9)dx by using the definition integrate from a to b of (f(x))dx= lim as n approaches infinity of sum_(i=1)^n of (f(x_i))(delta x) The summation inside the brackets is...

**math**

Use part I of the Fundamental Theorem of Calculus to find the derivative of g(x)= integrate from 9x to 4x of ((u+4)/(u-1))du

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