Tuesday

January 17, 2017
Total # Posts: 1,295

**Physics**

The blades in a blender rotate at a rate of 6500 rpm. When the motor is turned off during operation, the blades slow to rest in 2.6 s. 1. What is the angular acceleration as the blades slow down?

*November 22, 2010*

**Physics**

A laser beam is directed at the Moon, 380,000 km from Earth. The beam diverges at an angle of 4.6×10−5 rad. 1. What diameter spot will it make on the Moon?

*November 22, 2010*

**college physics**

An ideal gas (volume 1.1m3, pressure 103600 Pa, temperature 400 K) undergoes an isothermal process during which it absorbs 2000 J of heat. How much did the entropy of the system increase?

*November 19, 2010*

**college physics**

An ideal gas (volume 1.1m3, pressure 103600 Pa, temperature 400 K) undergoes an isothermal process during which it absorbs 2000 J of heat. How much did the entropy of the system increase?

*November 19, 2010*

**chemistry**

H2C=CH2(g) + H2(g) C2H6(g) Adding a small amount of platinum powder greatly increases the rate of the reaction above. How might the platinum be affecting the rate of the reaction? (Select all that apply.) 1) It increases the concentration of the reactants. 2) It increases the ...

*November 18, 2010*

**Math**

5/9 X (98.6 Fahrenheit - 32)=?

*November 16, 2010*

**Math**

5/9 (98.6 F - 32)=

*November 16, 2010*

**Physics**

You need to make a delta Y chart... Y= unknown (?) Vi= 0m/s (because he is starting from rest) Vf=3.8m/s (bottom of pole) a= found by using a=Fnet/mass equation below=7.34m/s t= not needed a=Fnet (720)/mass (98kg)= 7.34 m/s To find how far he slid down the pole, you must use ...

*November 16, 2010*

**chemistry**

Write the formulas for these compounds 1. manganese (IV) oxide 2. nickel (II) chloride 3. zinc chloride

*November 15, 2010*

**english 11**

King Arthur legend relates to sir gawain and the green knight and monty python and the holy grail?

*November 14, 2010*

**Physics Homework**

The answer is b. Archimedes principle states that if the the weight of the object is smaller than the displacement of the water, then the object will rise.

*November 13, 2010*

**Physics**

A 0.028 kg rifle bullet traveling 210 m/s buries itself in a 3.1 kg pendulum hanging on a 2.5 m long string, which makes the pendulum swing upward in an arc. 1. Determine the vertical and horizontal components of the pendulum's displacement.

*November 12, 2010*

**Physics**

A tennis ball of mass= 0.058 kg and speed= 19 m/s strikes a wall at a 45 degree angle and rebounds with the same speed at 45 degrees. 1. What is the magnitude of the impulse given to the ball? 2. What is the direction of the impulse given to the ball?

*November 12, 2010*

**Grammar**

The smell of cooking is delicious to the hungry campers

*November 11, 2010*

**Chemistry**

can you explain how to determine the shape of it though?

*November 11, 2010*

**Chemistry**

Draw the Lewis structures for each of the following, determine the shape of the molecules. a. H2S b. CN3- c. CCl4 d.NH4 e.PO4- f.PCL3 f.SF6 and explain how do you determine the shape of it

*November 11, 2010*

**Physics**

A 12 kg hammer strikes a nail at a velocity of 8.2 m/s and comes to rest in a time interval of 0.0083 s. 1. What is the impulse given to the nail? 2. What is the average force acting on the nail?

*November 11, 2010*

**Chemistry**

Explain how shielding contributes to the atomic radius trend within a group.

*November 10, 2010*

**Science**

Layers of rock

*November 7, 2010*

**social studies**

what is the official language of the phillopines

*November 5, 2010*

**7th grade**

give 2 other names for 2.5 dm measurement

*November 5, 2010*

**lever**

What is the definition of a lever

*November 3, 2010*

**9th grade**

A bowler rolls a 5 kg bowling ball down a magical frictionless bowling alley. The ball accelerates at an average rate of 2 m/s^2. How much force did the bowler apply to the ball?

*November 3, 2010*

**Physics**

A novice skier, starting from rest, slides down a frictionless 35.0 degrees incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom?

*November 2, 2010*

**orgo**

Which acid, maleic or fumaric acid appears to be more reactive to bromine addition? How does the cis/trans affect this?

*November 2, 2010*

**Organic Chemistry I**

Which acid, maleic or fumaric acid appears to be more reactive to bromine addition? How does the cis/trans affect this?

*November 2, 2010*

**3rd grade**

why did us want to buy small part of louisiana territory

*November 1, 2010*

**Physics**

A 87 g arrow is fired from a bow whose string exerts an average force of 105 N on the arrow over a distance of 76 cm. 1. What is the speed of the arrow as it leaves the bow?

*November 1, 2010*

**Physics**

A softball having a mass of 0.25 kg is pitched at 96 km/h. By the time it reaches the plate, it may have slowed by 9.0%. 1. Neglecting gravity, estimate the magnitude of the average force of air resistance during a pitch, if the distance between the plate and the pitcher is ...

*November 1, 2010*

**Physics**

A novice skier, starting from rest, slides down a frictionless 35.0 degree incline whose vertical height is 140 m. 1. How fast is she going when she reaches the bottom?

*November 1, 2010*

**Physics**

Two railroad cars, each of mass 7350 kg and traveling 80 km/h in opposite directions, collide head-on and come to rest. 1. How much thermal energy is produced in this collision?

*November 1, 2010*

**Physics**

A spring has a spring stiffness constant, k, of 420 N/m . 1. How much must this spring be stretched to store 30 J of potential energy?

*November 1, 2010*

**Physics**

A 66 kg bungee jumper jumps from a bridge. She is tied to a bungee cord whose unstretched length is 14 m, and falls a total of 34m. 1. Calculate the spring stiffness constant of the bungee cord, assuming Hooke's law applies. 2. Calculate the maximum acceleration she ...

*November 1, 2010*

**calculus**

find the inverse of q(x)=(x-5)^2

*October 31, 2010*

**calculus**

find the inverse of q(x)=(x-5)^2

*October 31, 2010*

**algebra**

For 1983 through 1995, the amount of private donations D (in millions) allocated to education can be modeled by D= 1.78t^3-6.02t^2+ 752t+ 6701 where t is the number of years since 1983. In what year was 14.3 billion of private donations allocated to education? (My main ...

*October 30, 2010*

**chemistry**

Thank you. I had quite a bit a trouble with this and appreciate the quick response.

*October 30, 2010*

**chemistry**

I'm kind of having difficulty with a question involving dimensional analysis. I'm confused how I would convert some units into others and what to divide. Here's the question. One 5lb Hershey's kiss is equivalent to how many little Hershey's Kisses? (1 ...

*October 30, 2010*

**MATHEMATICS**

HOW TO SOLVE THIS EQUATION: 0.2*Z + LOG(10.2*Z)= 3.512 THANKS IN ADVANCE

*October 29, 2010*

**Chemistry**

Cu (I): CN- Pb2+: CN-, SO3^2-, PO3^3-,MnO4- Ca2+: CN- Al3+: CN-, SO3^2-, PO3^3-,MnO4- Cr5+: CN-, SO3^2-, PO3^3-,MnO4- Pb4+: CN- Sn2+: CN- Mn2+:MnO4- Ag+:CN-, SO3^2-, PO3^3- H+: CN-, SO3^2-, PO3^3-,MnO4-

*October 27, 2010*

**Math PIZZAZZ**

Yeah it's halo

*October 25, 2010*

**pre-algebra**

what is 6 divided by 1 5/16?

*October 24, 2010*

**pre-algebra**

it takes 1 cup of liqiud fertilizer to make 7 1/2 gallons of spray. How much liquid is needed to make 80 gallons of spray?

*October 24, 2010*

**chemistry**

Which of the following would have a positive change in standard entropy at constant temperature? Choose all that apply. A) Burning octane to form carbon dioxide gas and water vapor B) Freezing titanium C) The endothermic dissolving of ammonium nitrate solid in water D) ...

*October 20, 2010*

**algebra**

10 2/3

*October 19, 2010*

**Organic Chemistry I**

You have isolated one of the isomeric dimethylcyclopentanes. on reaction it gives you 3 monochloroisomers, which of the possible pentanes is it? How do i do this? they don't give any choices, so how do i figure it out?

*October 18, 2010*

**Maths Calculus Derivative Integral - Urgent Please**

Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 (at the top) to x-5 (at the bottom) of square root of Sin(x)dx

*October 18, 2010*

**physics**

sin of angle = opp/hyp (SOH) cos of angle = adj/hyp (CAH) tan of angle = opp/adj (TOA)

*October 18, 2010*

**math**

7n^2+9n+2 (7n + 2)(n + 1)

*October 17, 2010*

**Math**

Ok, so if I change it to 2x^2 to x-5 of square root of Sin(x)dx, does it make sense? We haven't done any examples with an x in both the top and bottom of the integral sign. Thanks

*October 17, 2010*

**Math**

Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 to x-5 of square root of Sin(t)dt. Please help.

*October 17, 2010*

**math**

cosA = adj/hyp tanA = opp/adj sinA = opp/hyp

*October 17, 2010*

**Physics**

idk help

*October 15, 2010*

**chemistry**

In which solution (acidic, basic, neutral water, or doesn't matter) is potassium bromide most soluble? a. acidic b. basic c. neutral d. doesn't matter

*October 10, 2010*

**chemistry**

A buffer solution is 1.00 M in NH3 and 1.10 M in NH4Cl. If 0.230 moles of NaOH are added to 1.00 L of the buffer, what is its pH? Assume the volume remains constant. Kb of NH3 = 1.8 multiplied by 10-5.

*October 8, 2010*

**chemistry**

How many grams of HCOOH are needed to make 3.7 liters of aqueous solution of pH=3.5? I have followed the steps for a similar problem posted;I found x to 3.16e-4 mol/L but I'm having trouble converting it to grams.

*October 6, 2010*

**chemistry**

x=3.6e-4 mol/L x 3.7L x 43.06g HCOOH/mol = 0.050g HCOOH. my online homework counted this as incorrect. am I not going about it the right way?

*October 6, 2010*

**chemistry**

I found that problem, however I'm having trouble finding the amount of gram. I found x to 3.16e-4 mol/L

*October 6, 2010*

**chemistry**

How many grams of HCOOH are needed to make 3.7 liters of aqueous solution of pH=3.5?

*October 6, 2010*

**Thermochemistry**

Path A A sample of gas in a cylinder of volume 3.96 L at 327 K and 3.28 atm expands to 7.34 L by two different pathways. Path A is an isothermal, reversible expansion. Calculate the work for Path A. Answer in units of J. Path B Path B has two steps. In the first step, the gas ...

*October 5, 2010*

**AP Chemistry !**

Can you help me with this? If you can, do it as detail as you can. If not, you can just give me the answer, i'll try to figure how you did it :| A sample of gas in a cylinder of volume 3.96 L at 327 K and 3.28 atm expands to 7.34 L by two different pathways. Path A is an ...

*October 5, 2010*

**AP Chemistry**

What is the value of w (work) when 2.6 moles of H2 expands from 25 liters to 50 liters against a constant external pressure of 1 atm, then expands further from 50 to 100 liters against a constant external pressure of 0.1 atm? Answer in calories. Answer in units of cal.

*October 5, 2010*

**geometry**

what is the area of a hexagon with a 48 inch perimeter? i know its 166.277 but i need that in square root form?

*October 3, 2010*

**AMERICAN HISTORY**

After the Emancipation Proclamation, many African Americans A)boarded trains for the West. B)opened weapons factories. C)rushed to join the Union army. D)started getting paid by planters.

*October 1, 2010*

**HISTORY**

During the early part of the war, Lincoln's main goal was to.. A.)reduce the power of the states. B.)preserve the Union. C.)stop the spread of slavery. D.)free the slaves.

*October 1, 2010*

**history**

so they bring out their own opinion? yes I think politics would be more influential then. is there anything else that would back that up?

*September 27, 2010*

**history**

law because you cant change it so you have it follow it?

*September 27, 2010*

**history**

-Law: Original intent: Literalism Meaning of the words Logical reasoning Stare decisis Balancing approaches -Politics: Preference-based approaches Strategic approaches External factors Public opinion Political partisans Interest groups

*September 27, 2010*

**history**

Discuss the role of law and politics in Supreme Court decision making. Which is more influential? Why?

*September 27, 2010*

**MATH**

A triangle with vertices A(–3, 4), B(3, 1),and C(–1, –5) is translated 5 units left and 3 units up. Find the coordinates of A', B', and C'.

*September 27, 2010*

**MATH**

28. Chase Quinn wants to expand his cut-flower business. He has 12 additional acres on which he intends to plant lilies and gladioli. He can plant at most 7 acres of gladiolus bulbs and no more than 11 acres of lilies. In addition, the number of acres planted to gladioli G can...

*September 27, 2010*

**MATH**

A triangle with the vertices A(–3, 4), B(3, 1), and C(–1, –5) is dilated by a scale factor of 2. Find the coordinates of A', B', and C'.

*September 27, 2010*

**MATH**

Which term(s) describe(s) the system? 3x – 2y = 7 –9x + 6y = –10 dependent consistent and dependent consistent and independent inconsistent

*September 27, 2010*

**MATH**

Which term(s) describe(s) this system? 4x + y = 8 3x – 2y = –5 dependent consistent and dependent consistent and independent inconsistent

*September 26, 2010*

**preschool**

Reading,Math,Social Studies,Science,Gym,Music,Writing,and Health

*September 23, 2010*

**physics**

total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting on those palnes is 20 kpa. what must be the value of the pore pressure in the element if the minor principle stress in the elemnt is to be zero?

*September 19, 2010*

**10th grade**

see out of 500 if 6 people leave then how many will leave out of 600,000. so it will be (600,000 * 6) / 500.

*September 19, 2010*

**soil mechanics**

total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting on those palnes is 20 kpa. what must be the value of the pore pressure in the element if the minor principle stress in the elemnt is to be zero?

*September 19, 2010*

**math(please help)**

take 2 on left hand side which would be in denominator anr square both the sides so it will be (x/2)^2 = 6x-36 now solve the equation and thr u go with the ans.

*September 19, 2010*

**maths**

for tan2x=3 i get should get two values 71.56 and 251.56 but i dnt knw how to solve to get this two values. pls help me with this. thanx in advance.

*September 19, 2010*

**AP Chemistry**

HBr is mixed with water. Which is the best description of what you would expect to find in the solution? 1. H3O+, Br1−, and water molecules 2. HBr molecules, H3O+, Br1−, and water molecules 3. Br+, OH1−, and water molecules 4. HBr molecules and water ...

*September 17, 2010*

**AP Chemistry**

so what would be the answer?

*September 17, 2010*

**AP Chemistry**

Although soluble barium compounds are toxic, suspensions of insoluble barium sul- fate are routinely swallowed for upper gas- trointestinal X-ray studies. Why is barium carbonate not used? 1. Barium carbonate is too expensive. 2. Barium carbonate is soluble in plain wa- ter. 3...

*September 17, 2010*

**math**

m of angle 7=2x + 10 m of angle 3=3x - 15

*September 16, 2010*

**calculus**

thanks

*September 14, 2010*

**calculus**

Assume a substance has a half-life of 11 years and the initial amount is 144 grams. How much remains at the end of 5 years? How long will it be until only 30 % remains?

*September 14, 2010*

**language**

I am trying to do a report on the following and can't find any sites that contain info to make report. Looking for various types of humans that have lived on earth since time began. thanks for any help

*August 26, 2010*

**college- strength of material**

Thnx drwl but i knw the fomulas but i dnt knw hw to plot a graph wen juz max load is given.

*August 19, 2010*

**college- strength of material**

i have initial and final gauge length and diameter and also have max load. Now i have to draw stress strain diagram. I know how to draw that graph but i a not provided with failure load or yield load so i am not sure how to graph. We had performed experiment and data was given...

*August 19, 2010*

**college**

hey we performed experiment and lecturer mailed the results which doesnt have any series of results just one result. And gauge length is length of the specimen used.

*August 18, 2010*

**college**

I have initial and final gauge length and diameter and also have max load. Now i have to draw stress strain diagram. I know how to draw that graph but i a not provided with failure load or yield load so i am not sure how to graph. Appreciate any help. Thanx in advance

*August 18, 2010*

**Chemistry**

(50g)(0.107 cal/g degreesC)(tfinal-15C) +(25g)(1.000 cal/g degreesC)(tfinal-45C) is this correct

*August 7, 2010*

**Chemistry**

what is the final temp of the combination when 50 grams of chromium at 15 degrees celcius is added to 25 milliliters of water at 45 degrees celcius?

*August 7, 2010*

**trigo**

sin 47 degree 29 minutes = x/4728 x=4728(sin 47 degrees 29 minutes) x=3484.92m cos 47 degree 29 minutes= y / 4728 y= 4728(cos 47 degrees 29 minutes) y= 3195.20 m Am i correct?

*August 3, 2010*

**business communication**

Your boss wants to send a brief email message welcoming employees recently transferred to your department from your Hong Kong branch. They all speak English, but your boss asks you to review his message for clarity. What would you suggest your boss change in the following ...

*July 28, 2010*

**Physics**

Agree with Charlie, but try finding the net force and use Newton's 2nd law maybe.

*July 6, 2010*

**English**

So you go to Keystone Online Highschool? 9th grade? Me too. These answers were very helpful in me constructing my own answers. And you made many spelling errors, you also only had 1 space instead of 2 spaces after a period in many places. You should try putting your papers ...

*June 24, 2010*

**Management**

How is control related to planning, leadership, and to organizing? I know what the definition of control means in management. I just do not understand how control is related to planning, leadership, and organizing.

*June 22, 2010*

**algebra 2**

can somebody tell me how I am to solve this problem? x+8)(x-19)(x+3)>0 A. The solution set is {x|___} B. The solution is all real numbers. C. There is no solution.

*June 18, 2010*

**PARTICLE PHYSICS**

particle A has a mass of 2 and a charge of -1. particle B has a mass of 2 and a charge of +1. are particle A and particle B necessarily antiparticles? explain your answer

*June 9, 2010*