Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 903

**physics**

A 70kg man stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 90kg Is the elevator acceleration up or down, is the elevator moving up or down?
*October 27, 2010*

**phsics can someone check if i did it right**

A block of wood of mass 3kg is on a rough incline of 37degrees. Find the min value of the coefficient of static friction for the block to remain stationary? Fn=3*9.8cos37 Fn=23.4 3*9.8sin37-us(23.5)=0 us=.743
*October 27, 2010*

**phsics**

A block is at rest on an inclined plane whose elevation can be varied. The coefficient of static friction is μs= 0.4, and the coefficient of kinetic friction is μk = 0.16. The angle of elevation θ is increased slowly from the horizontal. At what value of θ ...
*October 24, 2010*

**Stats-BOB PURSLEY Help, do you know this?**

Is there a rule to figure out if this is a true or false statement? A sample size of 900 is not large enough to conclude that the sampling distribution of p is a normal distribution, when the estimate of the population proportion is .995.
*October 24, 2010*

**Physical Science**

Pitch is to make a plane descend or climb. The pilot adjusts the elevators on the tail to make a plane descend or climb. Lowering the elevators caused the airplane's nose to drop, sending the plane into a down. Raising the elevators causes the airplane to climb.
*October 24, 2010*

**chemistry**

Never mind i figured it out:)
*October 24, 2010*

**chemistry**

To what final volume should you dilute 50.5ml of a 4.75 M KI solution so that 27.5ml of the diluted solution contains 3.10g of KI
*October 24, 2010*

**Ap Chemistry**

:) Thanks you so much! :)
*October 24, 2010*

**12th grade**

Okay, sorry....I posted it again correctly :)
*October 24, 2010*

**chemistry**

Its just a general question. I'm trying to get the van't hoff factor and i think you need to know number of ions present. for example how do you know the # ions present in k2s
*October 23, 2010*

**chemistry**

How do you know the number of ions present in a compound.
*October 23, 2010*

**Chemistry**

Calculate the number of molecules in 3.1466x10^1 grams of sulfur dioxide, SO2
*October 22, 2010*

**Chemistry**

Calculate the number of molecules in 3.1466x10^1 grams of sulfur dioxide, SO2
*October 22, 2010*

**Chemistry**

calculate the grams of sodium in 17.606 g of Na2CO3
*October 22, 2010*

**5th grade**

88.8 or if you round 89
*October 14, 2010*

**4th grade**

all but a circle
*October 14, 2010*

**Physics**

A speedboat starts from rest and accelerates at 2.689x10^0 m/s2 for 6.5062x10^0 seconds. After that, the boat then accelerates at 1.7853x10^0 m/s 2 for 3.1299x10^0 seconds. What is the velocity of the boat at the end of this, expressed in 4 significant figures?
*October 13, 2010*

**chemistry**

please
*October 13, 2010*

**chemistry **

please
*October 13, 2010*

**chemistry**

Help please =)
*October 13, 2010*

**math**

math box! 5=15 10=25 15=35 20=45 25=55 what is the rule
*October 13, 2010*

**science**

try chicken wire
*October 13, 2010*

**Physics**

A car travels a total distance of 3.22911x10^2 m to the East in 6.7135x10^1 s. What is the speed of the car, in m/s with 4 significant figures? Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10
*October 12, 2010*

**math**

how do yu find the implicit differentiation for this porblem 4cosx*siny=1
*October 11, 2010*

**math**

Find two point on a circle x^2+y^2=1 where the slope of the tangent line is -2 write the equation for the normal lines at these points.
*October 10, 2010*

**math**

For the given function, find all points on an the graph where the tangent line is horizontal or vertical. y= xsqrt(4-x^2) y= sqrt(1-x^2)(4-x^2)
*October 10, 2010*

**chemistry**

225g
*October 1, 2010*

**chemistry**

of KCl
*October 1, 2010*

**chemistry**

A solution was prepared by dissolving 43.0 of in 225 of water. Calculate the mass percent of in the solution.
*October 1, 2010*

**math**

how?
*September 30, 2010*

**math**

wat is the answer for the pattern 1,3,6?
*September 30, 2010*

**physics**

The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I found the constant angular acceleration as 1.71rev/min^2. They also ask you to find What is ...
*September 28, 2010*

**Biochemistry**

What is the net ionic equation for Phosphate ion + ammonium molybdate in the presence of nitric acid?
*September 27, 2010*

**physics**

A coin with a diameter of 1.9 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 19 rad/s and rolls in a straight line without slipping. The rotation slows with an angular acceleration of magnitude 2.1 rad/s2. What is the ...
*September 27, 2010*

**physics**

The flywheel of a steam engine runs with a constant angular speed of 164 rev/min. When steam is shut off, the friction of the bearings and the air brings the wheel to rest in 1.6 h. I figured out the constant angular acceleration=1.71 rev/min2 but im not sure how to find:What ...
*September 27, 2010*

**phsics**

A coin with a diameter of 1.9 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 19 rad/s and rolls in a straight line without slipping. The rotation slows with an angular acceleration of magnitude 2.1 rad/s2. What is the ...
*September 27, 2010*

**phsics**

thanks that makes sense
*September 27, 2010*

**phsics**

You plan to throw stones by using a sling of length 1.8 m which you whirl over your head. Suppose you wish to throw a stone a distance of 29 m. What must be the centripetal acceleration of the stone just before its release if it is to reach this distance? Assume that the ...
*September 27, 2010*

**physics**

An arrow, starting from rest, leaves the bow with a speed of 16.5 m/s. If the average force exerted on the arrow by the bow were doubled, all else remaining the same, with what speed would the arrow leave the bow?
*September 25, 2010*

**physics**

A bat flying in a cave emits a sound and receives its echo 0.3 s later. How far away is the cave wall? Assume the speed of sound to be 340 m/s. Answer in units of m.
*September 23, 2010*

**chemistry**

What is the conjugate base of the following substances: a. (CH3)3NH /(CH3)3N b. H3N-CH2-COOH / H3N-CH2-COO c. H3N-CH2-COO / H2N-CH2-COO d. OOC-CH2-COOH / OOC-CH2-COO e. OOC-CH2-COOH / HOOC-CH2-COOH
*September 19, 2010*

**Algebra**

kewl
*September 12, 2010*

**Algebra**

Why is it necessary for the encoding function to be one-to-one?
*September 12, 2010*

**mathematics**

1/3 + 1/6 = simplify it later i need explanation of how you get this for example 3/4 + 1/8 = 3/4=6/8 6/8 + 1/8= 7/8 how did they get 6/8 im confused thanks for helping and please.
*September 12, 2010*

**Algebra**

A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is g(x)= 3x-94/4. A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the United States is f(x)=...
*September 12, 2010*

**science**

thanks drwls :)
*September 7, 2010*

**science**

This biome extends across Canada and down the Sierra Nevadas and Rocky Mountains. It has large coniferous forests. This biome is the _____. a) desert b) grassland c) tundra d) taiga e) deciduous forest I PICKED D
*September 7, 2010*

**science**

All the following are conservation practices, EXCEPT______? a) reducing consumption b) reducing production of goods using the resource c) recycling d) restoring the environment e) reducing waste I PICKED D
*September 7, 2010*

**science**

When cold air moves below warm air (which rises), we feel _______, depending on how fast the air moves. a) an earthquake or earth tremor b) a drizzle or rainstorm c) a breeze or wind d) a tornado or thunderstorm d
*August 26, 2010*

**algebra**

solve by elimination 3x+4y=2 6x+8y=4 stuck!!
*July 21, 2010*

**math**

Find y '. y = (2x^3 + 6)(2x^7 - 3)?
*July 4, 2010*

**COM 220**

nEED HELP WITH A FULL SENTENCE OUTLINE ON MEDIA VIOLENCE
*May 27, 2010*

**Aleg**

In 1991, the life expectancy of males in a certain company was 68.2 years. In 1997, it was 70.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1991. 1) The linear function E(t) that fits the date is E(t)=____t+____ Round to ...
*May 26, 2010*

**Math help please!!!**

edit: should be 3p^2q(1+3q-4q^2)
*May 20, 2010*

**Math help please!!!**

Factor completely 3p^2q + 9p^2q^2 - 12p^2q^3 I have done the following: 3p^2q(1+3q-4q^) but then i get stuck..not sure if that's the final answer..
*May 20, 2010*

**economic**

Rational people think at the margin that is one of the principle that I pickplay a major role out so can you provide an example for each about decision making interaction and the working of the economy.Explaine how that influences the marginal benefits and marginal costs ...
*May 14, 2010*

**economic**

which of the 10 principle do you think play a major role in your decision Provide an example for each about decision making interaction and the working of the economy.Explain how that influences the marginal benefits and marginal costs associated with the decision to purchase ...
*May 14, 2010*

**Math**

Use mathematical induction to prove that 5^(n) - 1 is divisible by four for all natural numbers n. Hint: if a number is divisible by 4, then it has a factor of 4. also, -1 = -5 +4 This is a take home test so I don't want the answer because I want to know how to do it. this...
*May 12, 2010*

**math**

1)In the figure, the vertices of right-angled isosceles triangle ABC are A, B(2,0) and C(8,0) respectively. find the equations of AB and AC 2)If the x-intercept and y-intercept of the straight line L: B(y-2) =Ax+8 are -8 and 3 respectively, find a)the value of A and B b)the ...
*May 11, 2010*

**math: not sure how to figure out**

Suppose a coin is biased so that it has the probilities below for landing on heads or tails on a single toss of the coin. P(h)=0.5020 P(t)=0.4980 If this coin is tossed twice find the probability P(hh)
*May 6, 2010*

**Chemistry**

The vapor pressure of nitrogen at several different temperatures is shown below. Temperature Pressure () 65 130.5 70 289.5 75 570.8 80 1028 85 1718 Use the data to determine the heat of vaporization of nitrogen. Determine the normal boiling point of nitrogen.
*April 29, 2010*

**chem**

Can someone help me I need to find out how to solve the following equation What is the PH/POH of a .0727m H3O+ Solution at 25 degrees c
*April 28, 2010*

**Chem**

The density of an unknown metal is 8.94 g/cm^3 and its atomic radius is 0.126 nm . It has a face-centered cubic lattice. Find the atomic weight of the unknown metal.
*April 28, 2010*

**chem**

Why are titrations using permanganate performed in acid solution?
*April 28, 2010*

**chem**

Why are titrations using permanganate performed in acid solution?
*April 28, 2010*

**chem**

Why are titrations using permanganate performed in acid solution?
*April 28, 2010*

**chemistry**

hmmmm this doesn't seem to help
*April 23, 2010*

**chemistry**

If this "point" for a particular titration occurs at pH x, a good indicator for for the titration would be indicator. Note: Provide only 1 indicator name (even if there are other indicators possible) and make sure the spelling is correct. X indicator 0.9
*April 23, 2010*

**Chemistry**

45.0 ml of 9.0x10 the negative 2m hno3 I am needing the steps to help solve the above chem equation
*April 20, 2010*

**chemistry**

If the stockroom fails to dry the KHP to remove the waters of hydration, the student's calculated concentration for the standardized base will be (low, high, or unaffected) A drop of NaOH is hanging from the buret tip before the titration of KHP. Once the student begins ...
*April 18, 2010*

**Chemistry**

question from my previous post answered by DrBob - is this because this acts as a polyprotic acid, or because the ratio in the Henderson Hasselbach for HA/A- remains the same?
*April 13, 2010*

**Chemistry**

is this because this acts as a polyprotic acid, or because the ratio in the Henderson Hasselbach for HA/A- remains the same?
*April 13, 2010*

**Chemistry**

How would the pH differ for a 0.1M solution of NaHCO3 vs 0.2M NaHCO3 - remain the same, double, half,or can't be calculated without Ka or Kb?
*April 13, 2010*

**math**

According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument. Given the obtuse angle x, we make a quadrilateral ABCD with DAB = x, and ABC = 90◦, andAD = BC. Say the perpendicular bisector toDC meets the ...
*April 1, 2010*

**math**

According to the Journal of Irreproducible Results, any obtuse angle is a right angle! Here is their argument.
*April 1, 2010*

**math**

Show that there are no positive integers n for which n4 + 2n3 + 2n2 + 2n + 1 is a perfect square. Are there any positive integers n for which n4 +n3 +n2 +n+1 is a perfect square? If so, find all such n.
*April 1, 2010*

**Chemistry**

Why is it important to use liquids with relatively lower boiling points when using the Dumas method?
*April 1, 2010*

**Chemistry**

How do you know that the NaCl has 100 ml. How much volume does the water which is also a product have?
*April 1, 2010*

**Chemistry**

How do you determine the moles of just NaCl? and is the moles of HCl and NaOH just the molar mass? Thanks
*April 1, 2010*

**MAth**

f(x)=x^2-9x+3
*March 28, 2010*

**MAth**

f(x)=x^2-9x+9
*March 28, 2010*

**History**

WHy ere the women in ancient egypt better off than the women in ancient greece? THANKS, HELP
*March 18, 2010*

**Chemistry**

Problem: In a first order decomposition reaction, 50% of a compound decomposes in 10.5 minutes. What is the rate constant of the reaction? The solution my professor gave says: k = .693 / 10.5min Where did the .693 come from? Thanks
*March 15, 2010*

**college STATISTICS**

Sample of 80 people randomly asked in casino shows that average lost per person is $160 with a standard deviation ó = $40. Based on this data create a 99% confidence interval for population mean. Does loss of $180 for single person contradict expectation? Explain your ...
*March 7, 2010*

**Math**

An urn contains 4 green, 6 blue and 10 yellow chips. You pay $5 to draw a chip from the urn. Here are the rules of the game: if you draw a green chip, the dealer returns you your bet and gives you an additional $5. if you draw a blue chip, the dealer returns you your bet and ...
*March 7, 2010*

**Physics**

An army of armadillios is attacking Cosine Castle where the coyotes reside. If an army must clear the 45 meter walls by 5 meters, at what angle must they set their cannons (from the horizontal) in order to fire inside the castle walls? The cannons fire cannonballs at 50 m/s. ...
*February 13, 2010*

**Business**

thnx:D
*January 30, 2010*

**Business**

Make sure to identify: • Your expectation of use of research by you in the workplace (ie: user, researcher, contributor) May i knoe what this quesiton is asking!!! thnx
*January 30, 2010*

**english!**

THNX.:D
*January 29, 2010*

**english!**

Write a short analysis of the use of researching in your future industry – how do they gather or use research ie: types of projects, proposals, etc… -can u explain this question to me plz. are they asking me to write a paragraph explaing how do they do research adn ...
*January 29, 2010*

**Math**

a) What is Agnessa's hourly rate of pay in a year with 26 biweekly paydays? b) Using your hourly rate computed in part a), what would Agnessa's gross earnings be for a pay period working an extra 10 hours overtime paid 1.50 times the regular rate of pay? (should be ...
*January 29, 2010*

**7th grade math**

can you help me ms.sue
*January 28, 2010*

**math**

plzzzzzzzzzzzzzz help me
*January 28, 2010*

**math**

tim and jim shared 35$ in the ratio 4:3 .how much did tim get ?
*January 28, 2010*

**math**

amy sloved 3/5 of her math problems and had 24 left to do. how many problmes did she solve ?
*January 28, 2010*

**science**

thank you so much for helping me.
*January 28, 2010*

**5th Grade Science**

oko;
*January 28, 2010*

**Earth Science**

Which of the following help create volcanoes? plate tectonics landslides cracks in Earth's crust built up magma
*January 28, 2010*

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