Questions Asked on
April 21, 2012

intro to physics
an athlete executing a long jump leaves the ground at a 28 degree angle and lands 7.6 m away. part a )what was the takeoff speed ? part b) if this speed were increased by just 8.0% , how much longer would the jump be ? for part a) i got roughly 9.48 but i

precalc helpppp
Find sin x/2, cos x/2, and tan x/2 from the given information. (show work please) thank you!!! cos x = − 4/5, 180° < x < 270°

Ap Phyics
Figure shows an overhead view of a 0.024 kg lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force F1 has a magnitude of 6 N and is at ¥è1 = 25¢ª. Force F2 has a magnitude of 10 N and is at ¥è2 =

Physics please help!
An object is moving along a straight line and the uncertainty in its position is 1.1 m. (a) Find the minimum uncertainty in the momentum of the object. (b) Find the minimum uncertainty in the object's velocity, assuming that the object is a golf ball (mass

physics
Extremesports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910m in Yosemite National Park. Assume a jumper runs horizontally off the top of El Capitan with speed 5.0m/s and enjoys a freefall until she is

trigonometry
Find all the angles between 0 degrees and 360 degrees which satisfy the equations a. 8 cos x sin x = sin x b. 5 tan^2 y + 5 tan y = 2 sec^2 y.

Antiln?!?!
use a calculator to find the antiln(0.049) to the nearest ten thousandth. My calculator doesn't do antiln. just ln. Someone helo me please?

math
Write three arithmetic and three geometric means between 4 and 324

trigonometry
given triangle ABC with AB=7cm, BC=8cm and AC=9cm calculate 1. the size of the largest angle 2. the area of the triangle

Math
In an election, ethan got 5 fewer votes than christohper,who got 3 more votes than olivia, who got 4 fewer votes than Ava. How many more votes did ava get than ethan ?

Physics
The ceiling of a classroom is 3.75 m above the floor. A student tosses an apple vertically upward, releasing it 0.5 m above the floor. What is the maximum initial speed that can be given to the apple if it is not to touch the ceiling?

chemistry
The standard molar entropy value of N2 (g) is 191.5 J/Kmol, of O2 (g) is 205.0 J/Kmol and of NO2 (g) is 240.0 J/Kmol. From these values we can calculate the Delta S for the reaction N2 (g) + 2 O2 (g) produces 2 NO2 (g) to be a. – 156.5 J/K b. 636.5

Math Analysis graphical method
a bakery makes both cakes and cookies. each batch of cakes reqire 2 hours in the oven and 3 hours in the decorating room. each batch of cookies need 3/2 hours in the oven and 2/3 of an hour decorating room. the oven is available no more than 15 hours a a

Math
Jan and Nika ride their bikes. Jan rides 5 miles per hour for 1 hour then rides at ten miles per hour for 30 minutes.Nika rides at a constant 8 miles per hour. the tripss cover the ssme distance. Forr !@#$%^&w many minutes does Nika ride ?

Math
A farmer’s harvest in bushels varies directly with the number of acres planted. A. Express in sentence form what this means to the farmer. B.Translate the variation statement into the corresponding variation equation. C. If 8 acres can produce 144

geometry
Concrete can be purchased by the cubic yard. How much will it cost to pour a slab 11feet by 11feet by 3inches for a patio if concrete costs $63.00 per cubic yard? $211.75 $70.58 (my choice) $317.63 $1,905.75 The volume of a cylinder is 980pi in^3. The

precalc
cosx= 8/17, 180

Statistics
An investigator wants to estimate caffeine consumption in high school students. How many students would be required to ensure that a 95% confidence interval estimate for the mean caffeine intake is within 15mg of the true mean? Assume the standard

Physics
The freefall acceleration at the surface of planet 1 is 18 m/s^2. The radius and the mass of planet 2 are twice those of planet 1. What is the freefall acceleration on planet 2?

math
The length of an opentop box is 4 cm longer than its width. The box was made from a 480cm^2 rectangular sheet of material with 6cm by 6cm squares cut from each corner. The height of the box is 6cm. Find the dimensions of the box. Please show me in detail

Physics
What is the fundamental frequency for a 58 cm banjo string if the speed of waves on the string is 450 m/s?

Plz help!!! algebra
use the binomial theorem to expand the binomial (x+5)^5 I have tried it like 4 times but i cannot get it right

calculus
The Institute finds that the average student taking Elementary Shorthand will progress at a rate given by dQ/dt=k(80Q) in a 20 wk course, where Q(t) measures the number of words of dictation a student can take per minute after t wk in the course. If the

PreCalculus
Evaluate the expression under the given conditions.? show work please! sin(AB); tan A=12/5, A in quadrant 3, sinB=3sqrt(10)/10, B in quadrant 4.

Exponential Functions?!
solve 9^(2x3) > 4. Round your answer to the nearest hundredth. The part in parenthesis is up at top like an exponent. I dont' know how to do this. Please help me.

biology
need help with a paper from news article on human biology using scientific method?

Chemistry
What is the ÄH of CF4 (carbon tetraflouride)? What is the ÄH of HF (hydrogen flouride)? Lastly, what is the ÄH of C2H4 (ethane gas)? Please help.

Physical Science
Can't figure this out, HELP!: What is the velocity (v) of a stream with a discharge (Q) of 8.53 x 10^3 m 3/s and a crosssectional area (A) of 5.27 x 10^3 m2?

Physical Science
Please help me with this. I just don't get it. The average rate of chemical weathering of carbonate rock in an urban area is 2.1 x 10^3 mm/yr. The depth of lettering of the tombstones shown in the table below was measured in 2010: Date on Tombstone Age

geometry
The table shows the exterior angle measures for regular polygons. Which expression represents the exterior angle measure for any regular ngon?

trigonometry
a ship travels 8km due north then 7km on a bearing of 070 degrees 1. draw a diagram to represent the information 2. calculate the distance and bearing of the ship from its starting point

ilfe orientation
identify and describe the enviromental problem waste dumps or fires that causes ill heath,accidents,crieses, and disasters within your community or any other community within south africa or globally

english/poem
I am suppose to do a funny sonnet poem that has 10 syllables per line and 14 lines .Can you check my syllable or any mistakes. Oh homework! Oh homework! How I hate you! You smell, you stink, and you I don’t admire I want to tell you “go on” “git”

physics
You have a tuning fork of unknown frequency. When you ring it alongside a tuning fork with known frequency of 360 Hz, you hear beats at a frequency of 10 Hz. When you ring it alongside a tuning fork with known frequency of 347 Hz, you hear beats at a

Finance
what is the 1st year interest on a convertible bond (20 yr, 10%)

intro to physics
I was wondering if you guys can help me with this question An airplance is traveling 835 km/h in a direction 41.5 degrees west of north. part a) find the component of the velocity in the northerly direction part b) find the same but in the westerly

physics
A mass of 2 kg is hung from the lower end of a vertical spring and extends it by 40 cm. The mass is now pulled down a further 20 cm and is then released from rest so that it oscillates about the equilibrium position. Determine : a) the spring stiffness

Intermediate Algebra
The function h(t)=16t^2+100t+300 gives the height in feet of a projectile fired from the top of a building in t seconds. A) When will the object reach a height of 350 feet? Round answer to one decimal place. B) Explain why part A has two answers.

Enviro Science
4. Which of the following is NOT a threat that impacts biodiversity? a. use of land for agriculture and housing b. dam construction c. overuse of water d. helping endangered species D 10. If exponential growth occurs in the population of a species of

Hyperbolas
Find the equation of the hyperbola whose vertices are at (1,5) and (1,1) with a focus at (1,7). Please and thank you.

chemistry
what are metals and non metals that are found in the human body and their function?

Accounting
1. Partially Correct Check My Work ProblemSolving Strategy Problem 161 (Algorithmic) Statement of Cash Flows—Indirect Method The comparative balance sheet of Mavenir Technologies Inc. for December 31, 2013 and 2012, is shown as follows: Dec. 31, 2013

Life orietantion
A clear explanation of how drug addition is a human factor that may cause ill health

math
In 2006, the population of the country was 32.3 million. This represented an increase in population of 6.5% since 2001. What was the population of the country in 2011? Round to the nearest hundredth of a million.

Economics(Please respond)
Given the increase in government expenditures and the marginal propensity to consume, how would you find the change in equilibrium GDP? I did the expenditures X the marginal propensity but this is wrong.

precalc
tanx= 12/5 x in Q 2. find sin2x= cos2x= tan2x=

precalc help
cos^2(x/2)sin^2(x/2) 2sin(x/2)cos(x/2)

Math Help PLEASE!
Find the equation of the hyperbola whose vertices are at (1,5) and (1,1) with a focus at (1,7). Please and thank you.

Chemistry
What is the difference between heat capacity and heat energy?

Chemistry
Calculate the concentrations of all species in a 0.810 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1 = 1.4 x 10^2 and Ka2 = 6.3 x 10^8 I calculated SO32 = 0.8096 M, HSO3 = 3.58E4, H2SO3 = 7.1E13, OH =

Inequalities
graph the system of inequalities: ( x3)^2/9 + (y+2)^2/4=4 I do not know how to simplify this down enough to graph it

Math
Jnuary 1, 1990 was a Monday. What day of the week was february 1, 1990 ?

space
i need facts why N.A.S.A should not shut down :) please hel pi cant find anything on google

PHYSICS
A mass oscillates up and down on a vertical spring with an amplitude of 6 cm and a period of 2 s. What total distance does the mass travel in 16 seconds?

poetry
Hi I need to do a critical analysis on one thematic aspect of Kenneth Koch's "One train may hide another" and I'm totally clueless. Any ideas?

Physical Science
Trying to figure this out and can't: The elevation of a streambed is surveyed near a bridge to be 2,367m. At another bridge 12.2km downstream the elevation is 2,232m. What is the gradient of this stream?

math
a rectangular field measures 20 meters by y meters is surrounded by grass patch of width 2 meters . What is the area of the grass patch ? Leave your answer in the simplest form in terms of y .

lang. arts
so, I am doing a collage and was wondering if I could get some of your guys "quotes" that are uplifting. The point is to take pictures, poems, quotes that were made y me, are famous, made by friends or whathaveyou. and that are uplifting and cheerful.

Physical Science
Could use some help. I don't get this: The maintenance department of a botanical garden is monitoring the displacement of statues that have moved by the process of creep. The statues must be straightened when the displacement reaches 15cm to prevent

linear algebra
Find the steady state for the Markov matrix? A=[ .2 .4 .3 .4 .2 .3 .4 .4 .4] Then calculate the limit of A^n = (0,20,0) as n>infinity

english
is their any such things as a sklekion bird that talks.

Statistics
A newspaper article stated that college students at a local university spent an average of $95 on beer a year. A student investigator who believed the average stated was too high polled a random sample of 50 students and found a mean of $92.25 and s = 10

CALCULUS
A smoke detector contains 0.2 mg of Americium 241 (Am241), a radioactive element that decays in t years according to the relation m = 0.2(0.5)^(t/432.2). Where m is the mass, in milligrams, remaining after t years. A) The smoke detector will no longer

Math
A guy wire is attached to the top of a pole. The other end of the guy wire is staked in the ground 29 feet from the base of the pole. How tall is the pole, if the guy wire is 73 feet long? Round to the nearest tenth.

math
Seek power series solution of the given differential equation about the given point x0; find the recurrence relation. (1x)y'' + y = 0; x0 = 0

Math
6cos^2 theta + 5cos theta=1 Solve for theta

MATHEMATICS
a bat can fly at a speed of 48km/h . How many minutes will it take to fly a distance of 8km

trigonometry
express 3 cos x 2 sin x in th eform R cos (x + a) and hence write down the maximum and minimum values of 3 cos x  2 sin x.

trigonometry
state the amplitude, period and phase shift of the function y=tan (2080 degrees)

calculus
Use Euler's method with given values of to obtain an approximation of the initial value problem when x=3 . Round your answers to four decimal places, if necessary. dy/dx= x+y, y(0) =3 n=4, y(3)= n=6, y(3)=

statistics
Please adviseThank you. The Center for Urban Transportation research released a report stating that the average commuting distance in the United States is 10.9 miles Suppose that this average is actually the mean of a sample of 300 commuters and that the

Equations of a Circle
Write the standard for of the equation of the circle that passes through the points at (0,8),(8,0),and (16,8). Then identify the center and radius of the circle. I have r=8, center=(8,8). What now?

physics
A physics student drops a physics text book into a mine shaft 250m deep,where the average mine temperature is 5degrees celsius.Show that the sound of the book striking the bottom is heard after 7.82seconds

Algebra
During the first part of a trip, a canoeist travels 57 miles at a certain speed. The canoeist travels 13 miles on the second trip at a speed 5 mph slower. The total time for the trip is 5 hrs. what was the speed on each part of the trip? The speed on the

english
explain the lesson[oliver walks to london]

trigonometry
state the amplitude, period and phase shift of the function y = tan (2 theta 180 degrees)

Statistics
The AP reported that in a sample of 507 people only 142 correctly described the Bill of Rights as the first ten amendments to the U.S. Constitution. Calculate a 95% confidence interval for the proportion of the entire population that could give a correct

English
Thank you very much, Writeacher. I need to revise these sentences, too. 1) I was last proud of myself when I helped one of my friends one week ago. She lost her father after a tragic accident (better: in) and I'm currently supporting her emotionally. 2) I

Math
Write a quadratic equation having the given numbers as solutions. 5 and 2 The quadratic equation is: __=0 Thank you.

foreign languages
Writeacher, I changed my name to Mike1 because someone answered my post with "I don't know". I hope it is OK with you. Here are the sentences I left out before. 1) I was proud of myself for helping my granny last holiday (on my last holiday, during my last

PHYSICS
You observe that 32 crests of a water wave pass you each minute. If the wavelength is 10 m, what is the speed of the wave?

maths
Continue these decimal patterns 0,0.5,0.6,0.75,0.8,0.83,,,

math
Class A has the same number of students as Class B. The ratio of the number of girls in Class A to the number of girls in Class B is 3 : 2. The ratio of the number of boys in Class A to the number of boys in Class B is 3 : 5. What is the ratio of the

Algebra
√3, 3√3 Write a quadratic equation in the variable X having the given numbers as solutions. Type in standard form ax^2 + bx +c =0

Stats
A random sample of n=500 households in a certain metropolitan area revealed that 150 have combined cable, phone and internet service. a.Calculate phat, the sample proportion of households having such service. b.Calculate a confidence interval for π, the

PHYSICS
What is the longest wavelength that can be heard by a normal ear?

Physics
A tuning fork has been damaged and its frequency slightly changed. What could its altered frequency be if it produces two beats per second with a tuning fork that is known to vibrate at 422 Hz? Lowest frequency? Highest frequency?

calculus
The population of a certain community is increasing at a rate directly proportional to the population at any time t. In the last yr, the population has doubled. How long will it take for the population to triple? Round the answer to the nearest hundredth,

life orientation
8 ways in which the environmental problem impact on within your community or any other community within south africa or globally.

chemistry
N2(g) + 3 F2(g) → 2 NF3(g) ΔH° = –264 kJ/mol ΔS° = –278 J/(mol∙K) a. Using the information provided above (only), calculate the maximum amount of nonPΔV work that can be accomplished through this reaction at a temperature of 500°C. b.

Chemistry
An experimental spacecraft consumes a special fuel at a rate of 2.10 × 102 L/min. The density of the fuel is 0.690 g/mL and the standard enthalpy of combustion of the fuel is –39.8 kJ/g. Calculate the maximum power (in units of kilowatts) that can be

life orientation
critically discuss 5 ways in which the human or environmental problem impacts on the community

Life orientation
Discuss 8 way in which the environmental problem impact on the within your community

math
Let f(x) be a polynomial of degree 3 which has a critical point at(1,8/3) and an inflexion point at(2,46/3) (a)Determine f(x) . (b) Find another critical point of f(x) (if any). (c) Determine the intervals where f(x) is increasing and where it is

L.O
In 1015 lines critically discuss 5 ways in which the human or environmental problem impacts on the community.I have choose pollution as the environmental factor

Life Orientation
How could air pollution in South Africa affect teenagers?

math
Question2; Consider the function f(x)= cos3x 4sin3x. (a)Find the equation of the line normal to the graph of f(x) when x= pie/6 . (b)Find the x coordinates of the points on the graph of f(x) where the tangent to the graph is horizontal. (c)Find the

geometry
In a right _angled triangle one of the acute angles is 20 dgrees greater than the other.find the angles of the triangle

Inventions
When was the telephone, atomic bomb, paper, flint tools, and the wheel invented? I've answered the other 4 and I think the telephone was invented in 1876. Please help.

Intermediate Algebra
If the discriminant of a quadratic equation has the given value, determine the number and type of solutions of the equation. A.48 B.0

algebra
5 and 2 write quad equation. __=0 Thanks

calculus
evaluate the limit by using change of variable lim x> 27

calculus
evaluate the limit using change of variable x> 27 27x _________ x^1/3 3 (answer is 1/12)

Chemistry
Enough of a monoprotic acid is dissolved in water to produce a 0.0169 M solution. The pH of the resulting solution is 2.68. Calculate the Ka for the acid.

physics
at a local country fair, the merrygoround rotates at a rate of one circuit every 7.5 seconds. what is the angular velocity in radians per second

Algebra
5 and2 write a quad equation. √5,6√5 write quad equation Tick, tick..I'm doomed..

math
You are planting a rectangular garden. It is 5 ft longer than 3 times its width. The area of the garden is 250 ft^2. Find the dimensions of the garden. I set it up like this: 3x +5 = 250 where x=8l.7. Is this correct so far, if so what do I do next? Thanks

Intermediate Algebra
Write with rational exponents 3 square root of x^2

Intermediate Algebra
Write with radical notation y^4/5

calculus
The rate at which a rumor spreads through an Alpine village of 400 residents is jointly proportional to the number of residents who have heard it and the number who have not. Initially, 5 residents heard the rumor, but 4 days later this number increased to

Life orientation
describe the environmental problem waste dumps that causes ill health,accidents,crises and disasters in South Africa and globally.

Accounting
What types of cost information are reported to support managerial purposes and decisions? Describe 2 major categories of purposes that are supported by cost information. Describe how cost information supports both of these categories. What is a cost object

Kasey
Write this repeating decimal as a ratio of relatively prime integers: 0.324324324...

Calculus
Find the derivative Y = ln(ln^2(ln^2 x))

social studies
i am studying about palestinia and israel i have to write 8 bullets notes on what are the problems of the palestians and israel in the middle east. I don't understand the problems going on over there is there a website for my age 12 to understand this

chemistry
an oxygen tank contains 12.0 L at 25 degree C and 3 atms. After a 4 L canister of oxygen at 25 degree C and 3 atms is emptied into the storage tank, what will happen to the temperature and pressure of the tank to be?

math
Write the first 8 terms of the meometric sequence with first term 10 and common ratio 2I.

math
The value of a $20,000 car decreases every, t. The equation below model this situation. 20,000(10.04t) = 13,000 How many years will the car be worth $13,000? Round to the nearest tenth if necessary. I got 20,000(.96t)= 13,000, but I don't believe gives me

probability
of the 2598960 different 5 card hands possible from a deck of 52 playing cards, how many would contain all 4 tens?

math
Given P(x) = x^3  3x^2  5x + 10 a evaluate P9x) for each integer value of x from 3 through 5 b. Prove that 5 is an upper bound on the zeros of P(x)

english/poem/writeteacher
Regarding my poem the teacher doesn't want to follow the traditional iambic pentameter. In this case do you think my poem has 10 syllables per line and funny?

math
write the particular equation of a quartic function that could, according to Descartes Rule of Signs have four positive zeros.

geology,, please help me
can you give me answers for these question for my homework. thank you 1. why dopeople fear earthquakes, hurricanes, and tornedoes more than they afraid than landslide? 2. if you were building a house on a cliff what would you look for to ensure that your

Mathematics
for the sequence 3,8,15,24,35,48,63 a. write the next two terms b. write an equation for t(n)[the n is under the t] in terms of n

algebra 2
When you spend $1 at the grocery store, the store doesn’t keep all of your money as profit. Some of it is reinvested in the economy when the grocery store buys more merchandise from suppliers. In turn, the suppliers don’t keep all of that money as

math
Write this repeating decimal as a ratio of relatively prime integers: 0.324324324...

math
Find the number to which this geometric series converges: 200  170 + 144.5  ...

math
You have 6 cups of sugar. It takes 1 cup of sugar to make 24 cookies. The function c(s) = 24s represents the number of cookies, c, that can be made with s cups of sugar. What domain and range is reasonable for the function?

chemistry
q1)Which entries below should have the highest standard molar entropy? a. SiCl4 (s) b. CCl4(l) c. CCl4 (g) d. SiCl4 (l) q2) For the above, which should have the next highest standard molar entropy?

Economics/Money
Suppose that banks today were required to keep 100 per cent reserves against their deposits. What would be the result?

Social Studies
How can minerals as a resource be utilized to contribute to economic development?

chemistry
For a particular reaction delta G is more negative than delta H. This means that a. delta S is zero. b. deltaS is negative c. delta S is positive d. delta S is negative if delta H is positive. e. delta S is negative if delta H is negative. i thought it was

Chem.
I was confused. is kinetic molecular theory the same thing as ideal gas law?

chemistry
Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is 2 NOCl (g) > 2 NO (g) + Cl2 (g) at 227C Using delta H = 81.2 kJ and delta S = 128 J/K, calculate the value of the equilibrium constant for this reaction. a 1.60 X 102 b. 2.1 X 107

chem
why does mercury level drop when you move to higher altitudes in a glass column filled with mercury.

chemistry
Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is 2 NOCl (g) > 2 NO (g) + Cl2 (g) at 227C Using delta H = 81.2 kJ and delta S = 128 J/K, calculate the value of the equilibrium constant for this reaction. a 1.60 X 102 b. 2.1 X 107

chemistry
Free energies of formation are a. always positive b. always negative c. never zero d. measured at 298K e. more than one response above is correct help thinkin a though

chemistry
delta G for a reaction can be calculated from 1. delta Gf data 2. delta Hf and delta S data 3. equilibrium constants a. only 1 or 2 or 3 b. 1 & 2 only c. 1 & 3 only d. 2 & 3 only e. 1, 2 & 3 help

chemistry
delta G for a reaction can be calculated from 1. delta Gf data 2. delta Hf and delta S data 3. equilibrium constants a. only 1 or 2 or 3 b. 1 & 2 only c. 1 & 3 only d. 2 & 3 only e. 1, 2 & 3 help

science
A doctor advises a patient to change home from the midst of a city to the city outskirts where lichens are found more.what could be the reason behind this advice?

math
A pair of dice is rolled, and a number that appears uppermost on each die is observed, Refer to this experiment and find the probability of the given event. (Enter your answer as a fraction)The sume of the numbers ia an add number.

chemistry
Calculate the value of ()Go for the following reaction , given the standard free energies of formation listed below each ion. Ag(SO3)_2^3 > Ag+ + 2SO32 delta Gf, kJ/mol = 943 +77 497 a.  1860 kJ b. – 128 kJ c. + 26 kJ d.  369 kJ e. + 523 kJ help

chemistry
A reaction will be nonspontaneous under all conditions when a. delta G is negative b. delta H is negative and DS is positive c. delta H is positive and DS is negative d. delta H is positive independent of the value and sign of DS e. delta S is positive

precalc helpppp
Evaluate the expression under the given conditions (show steps please) sin(è/2); tan è = − 5 / 12 , è in Quadrant IV

bethamhem
which group of native americans often moved, ffollowing the buffalo

English
Which is correct (* him or he)? The old man is satisfied for has won the battle between*him and the marlin. (Is it correct to say "has won" for the sentence above?)

English Essay:NCLB
can some proofread my paragraph it is for a persuasive essay? Please,Thank You!! Is Education system taking the risk for students learning? Is the capital that we have been giving helping students to improve their performance in schools ? What can be done

sdu
. A man finds that two things cause him to wake up at nightnoise or indigestion. If it is due to noise, the time to fall asleep again has exponential distribution with rate 5 per hour, and if it is due to indigestion the time to fall asleep again has

calculus
find the interval on which the graph of f(x)=ln(x^2+1) is concave upward.

chem help
what is the ratio of molezs of NaHCO3 reacted to moles of NaCl produced?

Life orientation
5 ways in which the human or enviromental problem impacts on the community

physics
A 2 kg metal plate slides down a 11meter high slope. At the bottom its speed is 7.5 m/s. To the nearest Joule, what was the magnitude of the work done by friction?If the slope in the above problem is 22 degrees, what is the coefficient of friction?

precalc helpppp
Simplify the expression by using a DoubleAngle Formula or a HalfAngle Formula. ã((1cos50)/2)

Chemistry
HF + NaOH =NaF + H2O What will be the pH of a solution produced when 40 mL of 0.25 M HF is titrated with 80 mL of 0.125M NaOH? Ka for HF is 3.5*10^4

Plz help!!! algebra
use the binomial theorem to expand the binomial (x5)^6

physics
How to find out specific heats of substances?

biology
What geological process is used to explain how nearly identical animals that cannot swim, are found on continents separated by large oceans? What is the halflife of Uranium 238 and what did we use that radioisotope to date as the oldest item on Earth?

Trig.
Subtract. Simplify is possible. (x^23x28)/(x^2x42) (x^2+10x+24)/(x^2+x12)

Math
I want to creat a easytouse formula to measure the intensity of a exercise workout. The input factors are: 1. Minutes exercise. 2. Miles run. 3. Calories burned. 4. Level of treadmill. So, if: Minutes = 50 Miles = 4 Calories = 423 Level = 10 Therefore,

PSSA
when is the science PSSA test. also if you taken the science PSSA test, what would be on it?

Cellular Anatomy
The function of smooth muscle is to provide? A. cushioning around the joints B.rapid contractions C.skeletal support D. involuntary movement Can some one check my answer it is (D)

language
does a type sketch always have to be written negatively? Can one write a type sketch from a positive point of view? Instead of pointing out vices or folly, can one point out good attributes? Thanks

Trig
Dalco manufacturing estimate that its weakly profit, P, in hundreds of dollars,can be approximated by the formula P= 4x²+8x+7, where x is the number of units produced per week, in thousands. 1)How many units should the company produce per week to earn

math
Find the value of the expression 128/(4)2+61

math
Simpliy (x^a1)^3 / (x^2a)(x)

Life orientation
1015 lines discuss 5 ways in which the human or environmental problem impacts on the community.

Trig.
Solve. Check for extraneous solution. 6x= √20+6x

Math
To which set of numbers does 13.274... belong? and Why? A) whole B) integer C) rational D) Irrational

Charu
Simplify 8.3^1/2 /( 6^1/2 + 5^1/2)

Math
Simplify (12^1/2 + 5. 3^1/3)^2

Math
Simplify 8.3^1/2 /( 6^1/2 + 5^1/2)

Algebra
The volume of a rectagular prism is x^3+3x^24x12. The length is x+2 and the width is x+3. What is the height

social studies
What are present day states that are part of the Area Ceded by Mexico and the Gadsden Purchase other than California and New Mexico?

Life orientation
Ways in which environment or human problems impacts on community.

how to find class widths??
can someone tell me how to calculate class width. suppose the number of classes and class widh being 5 and 12 respectively.form a grouped frequency distribution.. the maximum is 98 while the minimum is 12. Should i calculate it: maximum  minimum that is

Chemistry
An aqueous solution contains 0.216 M ascorbic acid (H2C6H6O6) and 0.131 M hydrochloric acid. Calculate the ascorbate (C6H6O62) ion concentration in this solution. [C6H6O62] =______________ mol/L.