Friday

December 9, 2016
Total # Posts: 3,360

**Chemistry**

The resolution limit of a microscope is roughly equal to the wavelength of light used in producing the image. Electron microscopes use an electron beam (in place of photons) to produce much higher resolution images, about 0.16 nm in modern instruments. Assuming that the ...

*March 30, 2012*

**Physics. PLEASE HELP!!**

A skier of mass 71 kg is pulled up a slope by a motor-driven cable. The acceleration of gravity is 9.8 m/s2. How much work is required to pull him 64.6 m up a 33.8 slope (assumed to be frictionless) at a constant speed of 2.53 m/s? Answer in units of kJ

*March 26, 2012*

**Physics. PLEASE HELP!!**

NOTE: 1 MJ = 106J. One of the most powerful cranes in the world, operating in Switzerland, can slowly raise a load of 6000 tonne to a height of 8 m. (1 tonne = 1000 kg) The acceleration of gravity is 9.81 m/s2 . How much work is done by the crane? Answer in units of MJ

*March 26, 2012*

**human development**

is it alzheimer's disease

*March 26, 2012*

**human development**

bulimia Alzheimer's disease osteoporosis menopause

*March 26, 2012*

**human development**

a condition that's generally the result of social pressure is?

*March 26, 2012*

**english ~ poems**

America by James Monroe Whitfield "America, it is to thee, Thou boasted land of liberty,— It is to thee I raise my song, Thou land of blood, and crime, and wrong. It is to thee, my native land, From whence has issued many a band To tear the black man from his soil, ...

*March 24, 2012*

**Physics. PLEASE HELP!!**

Find the power of a force F= (10 N)ˆý +(−4 N)ˆj if the velocity v = (−4 m/s)ˆý +(4 m/s)ˆj. Answer in units of W (^i and ^j means i hat and j hat)

*March 23, 2012*

**Physics. PLEASE HELP!!**

Find the power input of a force F=(7 N)ˆý + (3 N) ˆk acting on a particle that moves with a velocity v = (6 m/s)ˆý. Answer in units of W

*March 23, 2012*

**biology**

Name a covalent bond of amylose that can become hydrolyzed? Name a cvalent bond of Casein that can become hydrolyzed?

*March 22, 2012*

**physic**

In an experiment, a mass m = 40 gm, attached to a string wrapped around the axle of a flywheel and starting from rest, falls through a distance of 147 cm in 3.5 seconds. The diameter of the axle of the flywheel is 12 cm What is the acceleration of the mass and the angular ...

*March 22, 2012*

**Psych**

I have a test that accurately predicts who will learn statics quickly. My test has a. predictive validity but not reliability b. content validity but not predicitive validity c. predictive valisity and reliability d. neither validity nor reliability

*March 21, 2012*

**Psych**

If an iq test has high predictive validity, then a. a psychologist can accurately guess what score someone will get before he or she has started the test. b. students who get good score on the test will get even better scores if they take the test again c. The mean and ...

*March 21, 2012*

**business-ACCOUNTING**

Income from operations, $151,800 The following events took place for Fed Inc. during October 2012, the first month of operations as a producer of road bikes: • Purchased $427,000 of materials. • Used $367,500 of direct materials in production. • Incurred $315,...

*March 20, 2012*

**Chemistry**

so 1790 x (183/58.08) ?

*March 19, 2012*

**Chemistry**

Consider the following thermochemical equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover: C3C6O + 4 O2 --> 3 CO2 + 3H2O DELTA Hrxm= -1790kJ If a bottle of nail polish remover contains 183 mL of acetone, how much heat would be released...

*March 19, 2012*

**Geometry**

Find the area of the regular polygon with the given radius. Radius: 6cm. Area= apothem x perimeter/ 2

*March 19, 2012*

**phi103**

Mrs. Sue please help! I really need some help on these questions Please! I am having a very tough time. I have tried to answer to the best of my ability, but i am not understanding these. Can someone please help with this? Thank you. Truth tables can be used to examine ...

*March 18, 2012*

**PHI103**

I really need some help on these questions Please! I am having a very tough time. I have tried to answer to the best of my ability, but i am not understanding these. Can someone please help with this? Thank you. Truth tables can be used to examine inductive arguments. ...

*March 18, 2012*

**PHI103**

thank you for the input

*March 15, 2012*

**PHI103**

Imagine someone asks you what you have learned in your logic class and what you found to be the most useful information you learned there. Is it important for people to study logic? What kinds of mistakes might they make without having been exposed to a careful study of ...

*March 15, 2012*

**Chem 1A**

A 15.00 g sample of an ionic compound NaA, where A- is the anion of a weak acid, was dissolved in enough water to make 100.0 mL of solution and was then titrated with 0.100 M HCl. After 700.0 mL of HCl was added, the pH was 5.00. The experimenter found that 1.40 L of 0.100 M ...

*March 15, 2012*

**Physics**

Consider the 665 N weight held by two cables The left-hand cable had tension T2 and makes an angle of 43◦ with the ceiling. The right-hand cable had tension T1 and makes an angle of 48◦ with the ceiling. What is the tension in the cable T1 slanted at an angle of 48...

*March 15, 2012*

**Calculus (Please check my work!)**

^thats wrong. I got it wrong. sorry.

*March 15, 2012*

**Chemistry**

Predict the products when a chemist mixes an aqueous sodium chloride solution with an aqueous calcium nitrate solution.

*March 14, 2012*

**Chemistry**

A chemist mixes aqueous sodium bromide and aqueous lead (II) nitrate. Predict the product(s) of the reaction.

*March 14, 2012*

**CALCULUS**

12,240 lbs is the answer.

*March 12, 2012*

**4th grade math**

288/6=48. 48*5=240

*March 12, 2012*

**ACC 290**

How would I record the following transactions into a "T" account? This information relates to Pickert Real Estate Agency. Oct. 1 Stockholders invest $30,000 in exchange for common stock of the corporation. 2 Hires an administrative assistant at an annual salary of $...

*March 12, 2012*

**PHI103**

If the word "should" appears in a sentence, that sentence will always involve an ethical claim. True False To tell you the truth i really do not know this but maybe it could be true

*March 11, 2012*

**PH103**

A good way to establish a conclusion as true, or probable, is to A)insist that you are correct. b)construct a strong argument. c)construct a fallacious argument. d)ignore any objections to your conclusion I think it is b, can you help me to be sure.

*March 11, 2012*

**PHi103**

Karl Popper advocates, as a more efficient way to examine a scientific hypothesis, which of the following? a)Gather as much data as possible supporting the hypothesis b)Fake the data c)Try to show the hypothesis is false d)Meditate on what the hypothesis really means I believe...

*March 11, 2012*

**PHi103**

Karl Popper advocates, as a more efficient way to examine a scientific hypothesis, which of the following I believe it could be A Gather as much data as possible supporting the hypothesis

*March 11, 2012*

**Chemistry Help! Thank you :)**

Thank you!

*March 11, 2012*

**Chemistry Help! Thank you :)**

Assuming the final solution will be diluted to 1.00 , how much more should you add to achieve the desired pH? Information: Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.80. You have in front of you: 100 ml of 7.00×10−2 M...

*March 11, 2012*

**Math**

0.0003556 in scientific notation

*March 8, 2012*

**Math**

Sarah drove 30 miles with an average speed of 40mph. How long was she driving for?

*March 8, 2012*

**math**

George is making a circle graph of the basketball shots he made during the season. He made 16 foul shots, 29 two-point shots, and 5 three-point shots. What will be the measure of the angle he makes when creating the sector for foul shots?

*March 8, 2012*

**Physics**

The acceleration of gravity at the surface of the moon is approximately 1/6 that at the surface of the Earth (9.8m/s). What is the weight of an astronaut standing on the moon whose weight on Earth is 180lbs?

*March 8, 2012*

**ACC 290**

What is an example of an accrual?

*March 7, 2012*

**ACC 290**

When might an accountant use cash basis accounting without violating GAAP?

*March 7, 2012*

**english**

when Odysseus described his reputation for guile to Alcinous, he is revealing A)internal conflict B)character C)external conflict D)irony

*March 7, 2012*

**math 2nd grade**

what is 3/5 of 10? what is 1/3 of 12?

*March 5, 2012*

**Chemistry**

Calculate the pH of a 5.90 10-3 M solution of H2SO4 I have tried doing this as pH=-log[H+] and also by multiplying the Molarity by two because there are two hydrogens and then doing the -log but both ways have gotten me the wrong answer is there something i am missing? same ...

*March 5, 2012*

**Chemistry**

Calculate the pH of an aqueous solution containing 3.8 10-2 M HCl, 1.0 10-2 M H2SO4, and 3.3 10-2 M HCN.

*March 5, 2012*

**physics**

If the height of the water slide in the figure below is h1 = 1.55 m and h2 = 1.35 m, and the person's initial speed at point A is 0.593 m/s, at what location does the swimmer splash down in the pool?

*March 4, 2012*

**Chemistry**

How many moles of water are in 1.0g of water? (Give number only in space below to the correct number of significant figures)

*March 4, 2012*

**Chemistry**

In 1 mole of CaCl2 there are ____ moles of chloride ions. A. 1 B. 2 C. 0.5 D. None of these

*March 4, 2012*

**Chemistry**

There are _______ oxygen ions in 1 mole of Na2O. A. 6.0 x 10^23 O2 ions B. 1.2 x 10^24 O2 ions C. 3.0 x 10^23 ions D. None of these

*March 4, 2012*

**Stats**

Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is 75% 95% 68% 99.7%

*March 3, 2012*

**Chem**

When I do a) I get an answer of 0.298M, however, it says I'm wrong. b) worked perfectly

*March 2, 2012*

**Chem**

What stoichiometric concentration of the indicated substance is required to obtain an aqueous solution with the pH value shown below? a)aniline, C6H5NH2, for pH= 9.05 b)NH4Cl for pH= 5.22

*March 2, 2012*

**psychology**

a condition of late adulthood in which the pressure in the eye increases

*March 1, 2012*

**Physics**

An electron moves with speed 2.46 x 105 m/s in a 1.39-T uniform magnetic field. At one instant, the electron is moving due west and experiences an upward magnetic force of 2.81 x 10−14 N. Caculate the magnetic field (angle). What is the direction of the magnetic field? ...

*March 1, 2012*

**math 2nd grade**

Makoto and Otis each decorate diamond patterns that are the same size and shape. Makoto deoorates 1/8 of a diamond. Otis decorate 1/4 of a diamond. Who decorates more

*February 29, 2012*

**math 2nd grade**

Dwayne eats 1/9 of the raisin bread. Francisco eats 1/3 of the raisin bread. Who eats more raisin bread?

*February 29, 2012*

**1st grade math**

what addition fact can help you find 14-4? explain

*February 29, 2012*

**math 2nd grade**

Dwayne eats 1/9 of the raisin bread. Francisco eats 1/3 of raisin bread. who eats more raisin bread?

*February 29, 2012*

**math 2nd grade**

valarie makes 2 pans of brownies for a bake sale. She cuts each pan into 12 brownies. She sell 15 brownies. What fractional part of a pan of brownies did valarie sell?

*February 29, 2012*

**math**

valarie makes 2 pans of brownies for a bake sale. She cuts each pan into 12 brownies. She sell 15 brownies. What fractional part of a pan of brownies did valarie sell?

*February 29, 2012*

**math**

what addition fact can help you find 14-4? explain

*February 29, 2012*

**Physics. PLEASE HELP!!**

A small, spherical bead of mass 1.9 g is released from rest at t = 0 in a bottle of liquid shampoo. The differential equation of motion is dv/dt = g−b/m*v . The terminal speed is observed to be 1.6 cm/s. The acceleration of gravity is 9.8 m/s2 . Find the value of the ...

*February 29, 2012*

**Physics. PLEASE HELP!!**

Thank You!!!

*February 29, 2012*

**Physics. PLEASE HELP!!**

A Ferris wheel rotates 4 times each minute and has a diameter of 17 m. The acceleration of gravity is 9.8 m/s2. What is the centripetal acceleration of a rider? Answer in units of m/s2

*February 29, 2012*

**Physics. PLEASE HELP!!**

A Ferris wheel rotates 4 times each minute and has a diameter of 17 m. The acceleration of gravity is 9.8 m/s2. What is the centripetal acceleration of a rider? Answer in units of m/s2

*February 29, 2012*

**physics**

A 60 kg woman and an 85 kg man stand 9.0 m apart on frictionless ice. (a) How far from the woman is their CM? (b) If each holds one end of a rope, and the man pulls on the rope so that he moves 1.1 m, how far from the woman will he be now? (c) How far will the man have moved ...

*February 27, 2012*

**geometry**

If the m of angle AMD =x+2y and m og angle ABC=2x-y. Find the values of x and y

*February 27, 2012*

**math**

kim ate 3/2 slices of an apple. Did he eat less than a whole apple or more than the whole apple. draw picture to show your answer

*February 27, 2012*

**MATH**

Indira gets 12 birthday presents. She opens 2/3 of them. how many presents does she have left to open?

*February 27, 2012*

**science**

The density of liquid oxygen at its boiling point is 1.14 \rm{kg/L} , and its heat of vaporization is 213 \rm{kJ/kg} . How much energy in joules would be absorbed by 4.0 L of liquid ox

*February 27, 2012*

**Stats**

Explain how to calculate margin of error. What effect does increasing your sample size have on the margin of error? What effect does it have on the confidence level? What effect does it have on the confidence interval?

*February 26, 2012*

**Chemistry**

If a hydrate was found to contain 12% water and the original weight of the sample was 30g, what will be the final weight of the anhydrous sample?

*February 23, 2012*

**Math**

3 quarters, 4 dimes and 4 pennies. .75+.40+.04=1.19

*February 22, 2012*

**statistics**

Find the number z that satisfies the proportion of the observations in a standard normal distribution less than z is 30%?

*February 22, 2012*

**Math**

x= unknown number 1/3x-36=22 is the equation next line 1/3x=22+36 1/3x=58 You must do the inverse operation on both sides of the equation. (1/3x-36+36=22+36)--> (1/3x=58) next line x=174 Again do the inverse operation on both sides. (3/1 x 1/3x=3/1 x 58)-->(x=174)

*February 22, 2012*

**english**

I need examples of a sonnet!

*February 22, 2012*

**maths**

How do I find the derivative of ln(ln(1-x))? I know that the derivative of ln(ln(x)) would be 1/xlnx. Would the answer be 1/(1-x)ln(1-x)?

*February 21, 2012*

**Calculus AB**

Would the answer be (x^4)/4 + (e^3x)/3 + C?

*February 21, 2012*

**chemistry**

11.2 Liters

*February 16, 2012*

**physical Science**

When a light bulb is rated at 60 W ft what do this mean?

*February 16, 2012*

**physics**

A slingshot consists of a light leather cup attached between two rubber bands. It takes a force of 25 N to stretch the bands 1.1 cm. a) What is the equivalent spring constant of the rubber bands? Answer in units of N/m b) How much force is required to pull the cup of the ...

*February 16, 2012*

**Physics**

(1290+246)/4 Then use the formula T=2*pi**squareroot*(m/k) to find the answer

*February 16, 2012*

**physics**

A visitor to a lighthouse wishes to determine the height of the tower. The visitor ties a spool of thread to a small rock to make a simple pendulum, then hangs the pendulum down a spiral staircase in the center of the tower. The period of oscillation is 9.71 s. What is the ...

*February 16, 2012*

**Physics**

The distance between two successive crests of a certain transverse wave is 1.12 m. Eight crests pass a given point along the direction of travel every 12.3 s. Calculate the wave speed. Answer in units of m/s

*February 16, 2012*

**Physics**

Why do electric field lines begin on positive charges and end on negative charges?

*February 16, 2012*

**chemistry**

If I make 1 Liter of a 2M magnesium phosphate solution, how many grams of magnesium phosphate do I need

*February 15, 2012*

**Operations management**

At a major supermarket, checkout time is monitored to improve service quality. For six days, samples each with 20 observations have been obtained, and the following table summarizes the data. Determine if the checkout process is in control or not. You must show your analysis ...

*February 13, 2012*

**Health - Violence and Injury**

1. Which of the following is/are common characteristic(s) of child abusers? a. frustration with life b. has experienced violence in their life c. low socioeconomic status d. All of these 2. Jane is being harassed by a coworker. You would tell her to a. confront the person ...

*February 13, 2012*

**Operations management**

An appliance manufacturer wants to contract with a repair shop to handle authorized repairs. The company has an acceptable range of repair time from 50 minutes to 90 minutes. Two firms have submitted bids for the work. In the evaluation trail, one firm had a mean repair time ...

*February 13, 2012*

**physics**

state whether the variation pressure at nodes in a stationary wave is maximum or zero .justify

*February 13, 2012*

**physics **

two collinear harmonic oscillation x1=8sin(100pie(t)) and x2=12sin(96pie(t)) are superposed.calculate the *maximum and minimum amplitudes *the frequency of amplitude modulation

*February 13, 2012*

**physics**

for a damped harmonic oscillation , the equation of motion is md^2x/dt^2+(gamma)dx/dt+kx=o with m=0.025kg,(gamma)=0.07kg/s and k=85N/m. *calculate the period of motion *number of oscillation in which its amplitude will become half of its initial value *the number of ...

*February 13, 2012*

**physics**

the equation of transverse wave on a rope is y(x,t)=5sin(4.0t-0.02x) where (y) and(x) are measured in cm and (t) in second.calculate the maximum speed of particle on the rope

*February 13, 2012*

**math**

mr spoke is a salesman at pop's cycle shop. each month he earns 800 plus 7% of his total monthly sales. how much did he earn last month if his sales totalled 9200

*February 12, 2012*

**chemistry**

A student is given 3 beakers: Beaker 1- 50.0 ml of a solution produced by dissolving 6.00 grams of a weak monoprotic acid ,HX, in enough water to produce 1 liter of solution. The empirical formula of HX is CH2O. The solution contains 3 drops of phenolphthalein. Beaker 2- A 0....

*February 12, 2012*

**chemisry**

A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent. 100 ml of a 0.1M solution of the above acid is titrated with 0.1 M NaOH. After an ...

*February 12, 2012*

**Social Studies 7R - DBQ Essay**

taxed them after the french and indian war. they didn't have a lot of rights

*February 12, 2012*

**chemistry**

A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent.

*February 12, 2012*

**ELA**

pupperoni

*February 12, 2012*

**math**

Mary worked 30 hours this week, five of these hours were on Christmas Day (holiday pay). Determine Mary’s gross pay for this week

*February 11, 2012*