Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 264

**statistics **

The mean sleep time of babies is 14hrs,a sample of 64 babies showed a mean of 13hrs 30min with a standard deviation of 3hrs at 1% level of significance. Test the assertion that the mean sleep of the babies is less than 14hrs a day.
*August 7, 2014*

**statistics **

The mean lifetime of a sample of 100 light tubes is 1570 hours with a standard deviation of 80 hours test the hypothesis that the mean lifetime of the tubes is 1600 hours
*August 7, 2014*

**Calculus Help Please Urgent!!!**

A cone-shaped paper drinking cup is to be made to hold 30 cm^3 of water. Find the height and radius of the cup that will use the smallest amount of paper. (Round your answers to two decimal places.) Height = ? Radius = ? Show work please!!!
*April 15, 2014*

**CHEMISTRY HELP !!!! **

the following statement is false. Rewrite that it makes a correct statement about free energy. a. ΔGuniverse > 0 for any spontaneous process.
*April 15, 2014*

**CHEMISTRY HELP !!!! Show work please!**

Compute the energy released in kilojoules when the sun converts 1.00 metric ton into energy. NOTE: 1 metric ton = 1000 kg.
*April 14, 2014*

**Math (Trigonometry)**

1. If sec x + tan x = 3/2 and 0 ≤ x ≤ pi/2 then the value of sin x is... 2. If 0 ≤ x ≤ pi/2 and tan²x + sec x = 5 then cos x = ... Please help
*April 6, 2014*

**Physics**

The seesaw in the figure below is 4.5 m long. Its mass of 20 kg is uniformly distributed. The child on the left end has a mass of 14 kg and is a distance of 1.4 m from the pivot point while a second child of mass 39 kg stands a distance L from the pivot point, keeping the ...
*March 28, 2014*

**Statistics**

An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Calculate the margin of error, E, for a 99% confidence interval for µ, the average annual ...
*March 1, 2014*

**chemistry**

A 47kg sample of water absorbs 3.40×10^2kJ of heat. Part A If the water was initially at 21.5∘C, what is its final temperature?
*September 15, 2013*

**chemistry**

Gold has a density of 19.3 g/cm3. Do you think you could carry 1.30 cubic ft (rhetorical--don't answer)? How many pounds does 1.30 cubic feet of gold weigh? [453.6 g = 1 lb, 2.54 cm = 1 in, and 1 ft = 12 in.]
*September 14, 2013*

**Calculus**

The equation of motion of a particle is s=4t^3−7t, where s is in meters and t is in seconds. Find a) the velocity of the particle as a function of t : v(t)= b) the acceleration of the particle as a function of t : a(t)= c) the velocity after 5 seconds d) the acceleration...
*June 13, 2013*

**Math **

Im thinking of a two-digit number. It is a prime number which is 3 less than a perfect square. Also, when it's digits are reversed, it becomes a perfect square. What is the one possible number?
*June 11, 2013*

**geometry**

45. Find the similarity ratio of a cube with a volume 512 m3 to a cube with volume 3,375 m3. (1 point) 8 : 15 64 : 225 15 : 8 225 : 64
*June 10, 2013*

**Geometry**

help please
*June 10, 2013*

**Geometry**

44. The volume of a sphere is 2,098 m3. What is the surface area of the sphere to the nearest tenth? (1 point) 1,700 m2 146.2 m2 850 m2 26,364 m2
*June 10, 2013*

**us history**

Ms. Sue, trying to figur out how to even break down the question? Thanks, Patrick
*May 4, 2013*

**us history**

3. Keeping in mind how the expansion of U.S. territory westward threatened the delicate balance of power in Congress between free and slave states and Lincoln’s stance on slavery, describe how key events (such as land acquisitions, agreements about how new territories ...
*May 4, 2013*

**History**

2. The new democratic age of the 1820s, ’30s, and ’40s not only witnessed the advent of universal white male suffrage but also a strong impulse for social reform, which was often supported by those denied access to the ballot. What drove the impulse behind such ...
*May 4, 2013*

**maths**

When pulled a 30 m piece of string streches 180cm.find percentage increasing length
*April 22, 2013*

**Chemistry**

How do you write a chemical equation for NH4NO3? Is it... NH3 + H2O= NH4 + OH
*March 19, 2013*

**Physics**

I am having a problem answering a physics question: A plane is heading due south and climbing at the rate of 60 km/hr. If its airspeed is 540 km/hr and there is a wind blowing 110 km/hr to the northwest, what is the ground speed of the plane?
*March 17, 2013*

**Chemistry**

Suppose 50.00 mL of 2.0 E -5 M Fe(NO3)3 is added to 50.00ml of 2.0 E -4M KIO3. Which of the following statements is true? For Fe(IO3)3, Ksp= 1.0 E-14 a-precipate forms because Qc<Ksp b-No precipate forms because Qc>Ksp c-Nothing happended d-No precipate forms because Qc&...
*March 17, 2013*

**Chemistry**

I figured out the answer. Thanks.
*March 17, 2013*

**Chemistry**

What is the solubility (in g/L) of PbCl2 at 25 degree celsius? The solubility product of PbCl2 at 25 degrees celcius is 1.6x10-5.
*March 17, 2013*

**chemistry**

How many electrons in a cesium atom can have the quantum numbers of n = 3 and ml = -1
*March 9, 2013*

**Chemistry**

Question asking about how enzymes affect the rate of a reaction. Check all that apply 1. They shift the reaction equilibrium towards the products. 2. They increase the concentration of the reactants. 3. They lower the activation energy of the reaction. 4. They decrease the ...
*February 20, 2013*

**Physics**

Two blocks sit on a horizontal surface. They are connected to each other by a massless cord. The block on the left has a mass of 4.8 kg and the block on the right has a mass of 2.2 kg. Another massless cord is attached to the block on the right and pulls that block with a ...
*February 18, 2013*

**Physics**

A thin 5.4-m metal rod sustanins a longitudinal standing wave with vibration antinodes at each end of the rod. There are no other antinodes. The density and Young's modulus of this metal are, respectively, 5200 kg/m^3 and 7.9x10^10 N/m2. What is the frequency of the rod&#...
*February 11, 2013*

**physic**

A canon is angled at 45º and fires a canon ball at 100 m/s. How long will it take the canon to reach it's maximum height?
*February 4, 2013*

**physic**

A canon is angled at 45º and fires a canon ball at 100 m/s. How long will it take the canon to reach it's maximum height?
*February 4, 2013*

**Chemistry**

Which ligand binds the tightest? Ligand A, with a Kd of 10^-9M Ligand B, with a Kd of 10^-3M Ligand C, with a percent occupancy of 30% at one micromolar Ligand D, with a percent occupancy of 80% at 10 nm
*January 31, 2013*

**Chemistry**

I'm given sequences and asked to classify them as "Most likely an amphipathic alpha helix", "Most likely an amphipathic beta sheet", "Most likely a turn/loop" or "Not Amphipathic" Sequence 1: Arg-Phe-Gln-Ile-His-Val-Gln-Phe-Glu ...
*January 29, 2013*

**Math**

HELP! Input:1 1/3 Output 7/12 Input 2 3/5 Output 1 17/20 Input 3 5/6 Output ? Input ? Output 3 5/8. What is the rule, and what are the question marks values?
*January 23, 2013*

**Physics**

A long jumper leaves the ground at an angle of 15.1◦ to the horizontal and at a speed of 10.9 m/s. How far does he jump? The acceleration due to gravity is 9.8 m/s2 . Answer in units of m 010 (part 2 of 2) 10.0 points What maximum height does he reach? Answer in units of m
*January 23, 2013*

**chemistry**

23 grams of NaOH is dissolved in 1.5L of water, find; a)Concentration of the solution b)pOH c)pH
*January 20, 2013*

**chemistry**

A chemist decomposes several samples of carbon monoxide into carbon and oxygen and weighs the resultant elements. The results are shown below: Sample Mass of Carbon Mass of Oxygen 1 6 8 2 12 16 3 18 24 Do you notice a pattern in these results? Next, the chemist decomposes ...
*January 13, 2013*

**Physics**

Find the work done in stretching the spring. Answer in units of J
*December 14, 2012*

**Physics**

The force required to stretch a Hooke’s-law spring varies from 0 N to 70.4 N as we stretch the spring by moving one end 5.35 cm from its unstressed position. Find the force constant of the spring. Answer in units of N/m
*December 14, 2012*

**physics**

A 22 g bullet is accelerated in a rifle barrel 43.2 cm long to a speed of 907 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N
*December 14, 2012*

** math 5th grade**

Lynda cut 3.2 meters of ribbon into equal-size pieces. Each piece was longer than .01 meter, but shorter than .02 meters, with lengths in increments of .02 meters. How many pieces did Lynda cut and how long was each piece?
*December 12, 2012*

**Chemistry 12**

given the reacting system: H2 (G) + I2(G) ---> 2HI(g) Keq= 64 Equal moles of H2, I2, and HI are placed in a 1.0 L container. Use calculations to determine the direction the reaction will proceed in order to reach equilibirum
*December 6, 2012*

**Chemistry 12**

given the reacting system: H2 (G) + I2(G) ---> 2HI(g) Keq= 64 Equal moles of H2, I2, and HI are placed in a 1.0 L container. Use calculations to determine the direction the reaction will proceed in order to reach equilibirum
*December 6, 2012*

**College Algebra**

Find a polynomial function f(x), with real coefficients, that has 1 and 3+2i as zeros, and such that f(-1)=2 (Multiply out and simplify your answer)
*November 13, 2012*

**calculus**

Find the dimensions of the rectangle with the largest area that is inscribed inside the parabola y = 16- x^2 and the x-axis
*November 1, 2012*

**Geometry**

The angle of elevation of a ladder leaning against a wall is 45°. If the distance from the base of the ladder to the wall is 15 feet, find the length of the ladder.
*October 22, 2012*

**Math**

in reality 95 = 95.0 so if you move the decimal place over 1 to the left you get 9.5 x 10^1 = 9.5 x (10) = 95 if you move it twice to the left you get .95 x 10^2 .95 x 10^2 = .95 x (10 x 10) = .95 x 100 = 95 So your answer would be .95 x 10^2 so scientific notation would just ...
*October 10, 2012*

**Math**

mean = add numbers together then divide by how many #s Median = middle of the numbers mode is the most frequent number
*October 10, 2012*

**Precalc/Trig**

Find all values of x, 0<x<(pi/2) for which (1/( root 3))<cotx<(root 3)
*October 10, 2012*

**Math**

Find all values of x, 0<x<(pi/2) for which (1/( root 3))<cotx<(root 3)
*October 10, 2012*

**Math**

Find all values of x, 0<x<(ƒÎ/2) for which (1/ã3)<cotx<(ã3)
*October 10, 2012*

**Math**

Find all values of x, 0<x<(ƒÎ/2) for which (1/ã3)<cotx<(ã3)
*October 10, 2012*

**Math**

Find all values of x, 0<x<(pi/2) for which (1/( root 3))<cotx<(root 3)
*October 10, 2012*

**Math**

Find all values of x, 0<x<(ƒÎ/2) for which (1/ã3)<cotx<(ã3)
*October 10, 2012*

**Math**

80% times the price(x) .8x
*October 10, 2012*

**Science**

What is the final pressure of the gas relative to its initial pressure when there is an increase in Kelvin temperature of a cylinder of compressed gas by a factor of 2.7?
*October 9, 2012*

**Physical Science**

How much heat in joules is needed to raise the temperature of 5.5 L of water from 0 degrees Celsius to 78 degrees Celsius?
*October 9, 2012*

**math**

7.185 x 10^2 because you move the decimal 2 spots to the left
*October 6, 2012*

**PHYSICS**

WHEN THE BAROMETRIC PRESSURE IS 14.9LBS\IN AND THE PRESSURE GAGE ON A TIRE READS 34.6LBS\IN WHAT IS THE ABSOLUTE PRESSURE INSIDE THE TIRE
*October 1, 2012*

**Physic**

A ball is thrown upward. What is its initial vertical speed? The acceleration of gravity is 9.8 m/s^2 and maximum height is 7.2 m,. Neglect air resistance. Answer in units of m/s
*October 1, 2012*

**trig**

(a) sketch an angle A in standard position whose terminal ray passses through the point (1,-4) (b) Find the exact value of the six trigonometric functions of A, (c) Let B be the reference angle of A. Find a point on the terminal rsy of B in standard position and add B to your ...
*September 15, 2012*

**trig**

find the reference angle of -20000 and express the six trigonometric functions of -20000 in terms of the six trigonometric functions of its reference angle.
*September 15, 2012*

**trig**

my question is find all angles of theta and 2pi whose reference angle is alpha = pi/12. Give exact answers. i cannot for the live of me find this
*September 15, 2012*

**Math**

Thank yo MS Sue. That is want I came up with but just wanted confirmation. thank you
*September 11, 2012*

**Math**

there are 7 people and you ordered 4 pizzas. Each person ate 3/8 of a pizza. How much pizza would you have left
*September 11, 2012*

**Physics**

Consider the following four possibilities for two point charges and choose the one(s) that do not change the magnitude of the electrostatic force that each charge exerts on the other: A. Double the magnitude of each charge and double the separation between them. B. Double the ...
*July 18, 2012*

**math**

find the area of a rectangle bounded by the axes and one of its corner is a point in the curve y=1/x.
*July 16, 2012*

**computers**

I'm confident that I found the right answer at Google, and I don't even have a copy of your book. What's in your book is not a magical world that can be divorced from the real world. Your book can't tell you something is true if there is no other way to CONFIRM...
*June 27, 2012*

**Computer Label Paper**

This is a trick question, since some of these paper choices don't even exist! Avery does not make ANY product with the number 6150 as part of the product name, according the the Avery company site. If Avery doesn't even offer the paper in answers (A), (B), (C), or (D...
*June 27, 2012*

**Logic**

Distribution: "We distinguish a distributed term (subject or predicate) from an undistributed term in this manner: A distributed term is one modified by 'All' or 'No.' When a term is modified by "some," it is undistributed," because it does ...
*June 27, 2012*

**English**

This sentence above is one terrible example of English. There should be a semicolon after "playground" instead of a colon. I hope you read a lot of books and newspapers, so that you won't have to learn proper English grammar entirely from books like this one.
*June 26, 2012*

**U.S. GOVERNMENT**

You can answer all of the above questions by googling the qestions' key words in the questions. And you'll learn a lot by doing so. If you don't understand the vocabulary (terms) used in the questions, you might have trouble. So, you might have to look up the word...
*June 26, 2012*

**English Language**

You could make a list the reasons why you don't like to be a class monitor. But, you would have to think about the experience and write the list.
*June 26, 2012*

**History**

When you are given a multiple choice question, you have to look at each possible answer to determine why it might be wrong. You have to look at each of the possibilities and find a logical reason to eliminate them until you have eliminated all but one answer. When only one ...
*June 25, 2012*

**READING**

Your confusion probably results from not understanding the phrase "suited to." In this case, "suited to the night" means "benefits from the night." Compare this to people (like house painters, dressmakers and jewelers) who benefit from working in ...
*June 24, 2012*

**Public Speaking**

The question is, who is the president's audience? Since the President's audience is the public (everything he says will become public), therefore this is public speaking. Everything the President says in his speech will be reported in the newspapers and his speech will...
*June 24, 2012*

**Australian Studies**

"great obesity epidemic" is in quotation marks, so just Google it, in quotation marks, and see who used this expression and why. Once you've read a newspaper article or two that includes this expression, you'll have all of the information you need to answer ...
*June 24, 2012*

**HEALTH**

Is this proposition true? For it to be true, BOTH parts have to be true. Is it true that "anything lawful is ethical"? Is it true that "anything ethical is therefore always legal." Because the words "always" is used, in the second part, and always...
*June 24, 2012*

**science**

Are we talking about an automobile or a train car? The answer would depend on variables like the height of car and the location of it's "center of gravity." Also, I assume you mean, 'How fast can the car go without tipping over?' Whether the car is on ...
*June 20, 2012*

**abnornal psych**

Here is a list of criteria that the American Psychiatric Association says it will use to determine what new diagnoses might appear in the new DSM. After reading the half page of criteria, you can try and decide for yourself whether it seems like "suicide" would/...
*June 18, 2012*

**French**

The terrible thing about textbooks is that it's not enough to be able to read and understand the text. You ALSO have to be able to read and understand the question about the text. If you cannot understand the question that is asked, it doesn't matter that you DO ...
*June 11, 2012*

**Chemistry**

How many moles of Xe gas are there in a container of Xe with a volume of 1.5L, and a pressure of 1.25 atm, and a temperature of 150C?
*May 13, 2012*

**Chemistry**

A container with a volume of 19.6 L that has temperature of 37C and a pressure of 0.900 atm has its temperature lowered to 0.00C and its pressure raised to 1.90 atm. What will the new volume be? Assume that the number of moles is constant.
*May 13, 2012*

**Writing**

You have a lot of facts here about the singing governor. If you think about why each even occurred and try to explain, then you'll write a better paper. For example, you say that his career began when he was signed to Decca Records. But, if you think about what you've ...
*May 6, 2012*

**Life orientation**

Drug addiction
*April 28, 2012*

**life orientation**

Water polution couse many illnes like malaria
*April 25, 2012*

**geometry**

Chapter one Quiz 3 to the heart tenth. cone S. Find the surface i 12 Chapter 12 Quiz 4
*April 11, 2012*

**Math**

$500 was deposited into an account at the first of the year. Interest earned was 5%. An additional $15 was deposited each week. How much was in the account at the end of the year?
*March 7, 2012*

**Math**

$500 was deposited in January @ 5% interest. $15 per week deposited all year long. How much money was in the account at the end of the year?
*March 7, 2012*

**calculus**

graph 2.25h+5m>23
*February 13, 2012*

**calculus**

Give a possible formula for the illustrated function using a vertical shift of an exponential function. The two points marked on the graph are A=(−172) and B=(10). The red horizontal line is given by y=−3, and is a horizontal asymptote of the function y=?
*February 3, 2012*

**Acid-base titration**

A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M. Find the pH at the following volumes of base added and make a graph of pH versus Vb: Vb = 0, 1, 5, 9, 9.9, 10, 10.1, and 12 mL.
*January 23, 2012*

**physics**

A puck on a horizontal, frictionless surface is attached to a string that wraps around a pole of finite radius, as shown in the figure . As the puck moves along the spiral path, does its speed increase, decrease, or stay the same?
*January 22, 2012*

**language arts**

are my feet are killing me is a alliteration, personification , or hyperbole?
*December 8, 2011*

**physics**

A 19.2-kg box rests on a frictionless ramp with a 16.1° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 43.6° with the horizontal, what is the smallest force F the mover will have to exert to move the box up...
*October 2, 2011*

**Calculus**

Can someone explain to me how to do these? Given the following definite integral and n=4 answer the following questions. (Round your answers to six decimal places.) 1. Use the Trapezoidal Rule to approximate the definite integral. Answer: T4= 2. Use the Midpoint Rule to ...
*September 29, 2011*

**AP World History**

I took college levels classes AT A COLLEGE beginning when I was 13 years old and I accumulated over 40 credits toward college before I was 18 years old. Don't let anyone tell you you can't understand college materials. Before you search the text of your textbook for ...
*September 15, 2011*

**Physics**

A positive charge Q is on the y-axis at a distance a from the origin, and another positive charge q is on the x-axis at a distance b from the origin. A) For what values(s) of b is the x-component of the force on q a minimum? B) For what values(s) of b is the x-component of the...
*September 6, 2011*

**Physics**

A positive charge Q is on the y-axis at a distance a from the origin, and another positive charge q is on the x-axis at a distance b from the origin. A) For what values(s) of b is the x-component of the force on q a minimum? B) For what values(s) of b is the x-component of the...
*September 6, 2011*

**math**

mathematical expression of: 1.) 75-5 2.) 14x(3+4) 3.) 3x(11+6) 4.) 1+(6+8) 5.) 20+5-80 6.) 4x2+5
*June 7, 2011*

**algebra 1 honors**

If r=5/3r+20/3, what is r? URGENT!!!!
*May 2, 2011*