Friday

July 29, 2016
Total # Posts: 795

**physics**

You throw a 141 g ball straight up to a height of 45.0 m. Assume that the displacement of your hand is 0.70 m as you throw the ball straight up. How long is the ball is in your hand?
*March 6, 2012*

**PHYSICS**

conservation of mech energy... look at two spots, when the bob is at the lowest, and the highest... KE (lowest) + KE (highest) = U (lowest ) + U (highest) 40J + 0J = 0J + mgh 40J = 2.5kg(9.81m/s^2)(height) height = 1.6309m
*March 6, 2012*

**physics**

Half
*March 4, 2012*

**physics**

A rubber ball of mass 19.5 g is dropped from a height of 1.85 m onto a floor. The velocity of the ball is reversed by the collision with the floor, and the ball rebounds to a height of 1.55 m. What impulse was applied to the ball during the collision?
*February 24, 2012*

**MATH**

How do I find JK for J(3, 8)and K(-1, 4)? Please help!
*February 21, 2012*

**GEOMETRY**

If EF=3x-10, FG=2x-15 and EG=20, find the value of x, EF and FG.
*February 20, 2012*

**GEOMETRY**

Which property supports the statement: "If AC=DF, then DF=AC" Symmetric Reflexive Transitive Substitution
*February 20, 2012*

**GEOMETRY**

Which statement is contrapositive of the conditional: If a triangle is isosceles, then it has 2 congruent sides. 1. If a triangle does not have 2 congruent sides, then it is not isosceles. 2. If a triangle is isosceles, then it does not have 2 congruent sides. 3. If a triangle...
*February 20, 2012*

**grammar**

what is the direct object in the head of the stables often mistreated agba and the young colt
*February 14, 2012*

**Physics**

Three charged particles form a triangle: particle 1 with charge Q1 = 84.0 nC is at xy coordinates (0, 4.60 mm), particle 2 with charge Q2 is at (0, -4.60 mm), and particle 3 with charge q = 40.0 nC is at (6.40 mm, 0). What are the x component and y component of electrostatic ...
*January 29, 2012*

**Physics**

Three identical conducting spheres initially have the following charges: sphere A, 4Q; sphere B, -9Q; and sphere C, 0. Spheres A and B are fixed in place, with a center-to-center separation that is much larger than the spheres. Two experiments are conducted. In experiment 1, ...
*January 29, 2012*

**physics**

A force of 0.053 N is required to move a charge of 36 µ a distance of 30 cm in a uniform electric field. What is the size of the electric potential difference between the two points?
*January 12, 2012*

**volta**

What the formula for finding the % of 35% of 22. I know the answer is 7.7, but how do u get that answer
*January 11, 2012*

**physics**

Joe stands on a bridge kicking stones into the water below. If he kicks a stone with a horizontal velocity of 2.60 m/s, and it lands in the water a horizontal distance of 8.10 m from where Joe is standing, what is the height of the bridge? Enter m as unit.
*January 9, 2012*

**geometry**

An architect needs to design a rectangular room with an area of 75 ft What dimensions should he use in order to minimize the perimeter? Round to the nearest hundredth, if necessary
*January 6, 2012*

**physics**

After a shipwreck, a solid steel spoon lies at the bottom of the ocean, 5.75km below the surface. What's the water pressure at that depth? Find the fractional volume change in the spoon due to compression forces.
*December 11, 2011*

**Physics**

A 0.15 kg ball of dough is thrown straight up into the air with an initial speed of 5.7 m/s. a.)Find the momentum of the ball of dough at its maximum height. b.) Find the momentum of the ball of dough halfway to its maximum height on the way up.
*December 8, 2011*

**Math **

Peter bought a computer at a local electronics store. If the computer cost $750.00, and tax was 7%, how much did Peter pay in tax?
*December 8, 2011*

**math**

2sin2x+1=0
*December 1, 2011*

**trig**

Use the Law of Sines to solve each triangle. P=110 degrees p=125, r=200 in triangel PQR
*November 26, 2011*

**Math**

Find two consecutive whole numbers such that 3/4 of the first number is 5 more than the second number.
*November 17, 2011*

**Math**

Find two consecutive whole numbers such that 3/4 of the first number is 5 more than the second number.
*November 17, 2011*

**physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque ...
*November 12, 2011*

**physics**

An 83.2-kg propeller blade measures 2.24m end to end. Model the blade as a thin rod rotating about its center of mass. It's initially turning at 175rpm. Find the blade's angular momentum, the tangential speed at the blade tip, and the angular acceleration and torque ...
*November 12, 2011*

**math**

Find the mystery number im a number between 300 and 400 im divisible by 3 and 4 . but not 9 my tens digit is a square number the sum of the hundreds digit and the tens digit is a prime number. find the mystery number
*November 8, 2011*

**enlish/grammar**

Here are a few more of the predicate adjective or predicate noun sentences I need help with to see if I used the right one. Wildflowers look lovely on the hillsides. PA Mounties on horesback are a common sight. PN The Royal Canadian Mounted Police's nickname is the ...
*November 7, 2011*

**enlish/grammar**

I was wondering if these sentences are labeled right with either predicate noun or predicate adjective? Their presence was necessary in the far north country in the early days. preicate noun Now they are famous throughout the world. predicate noun They are the subject of many ...
*November 7, 2011*

**science**

On Apollo missions to the Moon, the command module orbited at an altitude of 150 above the lunar surface. How long did it take for the command module to complete one orbit?
*November 3, 2011*

**math**

long one is the minute hand short one is the hours hand
*November 1, 2011*

**math's**

5050 formula sum of sequence of numbers=(n/2)(first number plus last number) n is total amount of digits so total = (100/2)(1+100) =50(101) =5050
*November 1, 2011*

**math**

The symbol > means the first number is greater than the second. The symbol < means the first number is less than the second. These are true statements. 5 > 2 3 < 10 Your answer is 4 4/3 > 4 1/2
*November 1, 2011*

**psychology**

According to Piaget, egocentrism refers to?
*October 27, 2011*

**physics**

Tigger likes to play golf. For this particular shot, the distance between the spine and the clubhead (aka the distance of the golfclub + arm) is 1.6 m. When the clubhead hits the ball, it is travelling at 50 m/s. How fast is the body and the club rotating? That is, what is the...
*October 26, 2011*

**Chemistry**

2h2s g 3o2 g 2so2 g 2h2o g H=-1036KG/MOL calculate enthalpy change in kj when 18.2 g of hydrogen sulfide are burned
*October 23, 2011*

**chemistry 105**

.555 g
*October 23, 2011*

**physics**

George takes off for a long jump at an angle of 28 degrees, and lands 6.9 m away. How fast was he when he jumped?
*October 20, 2011*

**English**

Anyone know summary or any information about the story capital gains by rana dasgupta? it is from th ebest american nonrequired reading
*October 18, 2011*

**english**

I should write out the whole section for u here? i can do that
*October 18, 2011*

**physics**

Yes, it is in mechanical equilibrium. There is no longer a force acting upon the puck, which is why it remains at a constant speed. There was a force when the stick pushed it, and realistically there would be a very small force of friction which would slightly slow it down, ...
*October 17, 2011*

**Frank N. Osborne Middle School**

14 cm
*October 17, 2011*

**Chemistry**

3.4 L at 328 torr and 37 Celsius how many moles are there?
*October 12, 2011*

**Chemistry**

number of moles of NaOH required to titrate 38.05mL of a 1.500 M H3PO4 solution
*October 12, 2011*

**Chemistry**

How many moles and number of ions of each type are present in the following aqueous solution? 113 mL of .490 M aluminum chloride.
*October 4, 2011*

**Chemistry**

how many ions and moles does 113 mL of .490 M aluminum chloride have?
*October 3, 2011*

**Chemistry**

Is C12H22O11 soluble in water and is it ionic or a acid?
*October 3, 2011*

**Chemistry**

a mixture of .0285g of H and .0141 mol of oxygen in a closed container is sparked to initiate a reaction. How many grams of H2O can form?Which reactant is in excess and how many grams remain?
*September 28, 2011*

**Math**

Ramon planted 3 rows of seeds. He put 8 seeds in each row. Each row of seeds was 42 inches long. How far apart did Ramon plant the seeds?
*September 27, 2011*

**Business Communication**

I think the answer might be d.
*September 27, 2011*

**math **

jill has four of her five game scores: 8 6 6 3 her average score for the five games is 6 points. what is the fifth game score? write an equation to help solve the problem.
*September 25, 2011*

**algebra**

what is the exponent of 289
*September 22, 2011*

**Math**

Everyone in Mrs. Bowman's art class has 8 jars of paint ecept Jerome, who has 10. There are 74 jars of paint in the room. How many students are there in Mrs. Bowman's art class?
*September 22, 2011*

**Physics**

A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0.995 m (3.26 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?
*September 18, 2011*

**Physics**

A pitcher throws a baseball horizontally from the mound to home plate. The ball falls 0.995 m (3.26 ft) by the time it reaches home plate 18.3 m (60 ft) away. How fast was the pitcher's pitch?
*September 18, 2011*

**Math**

You have a 4inch by 6inch notecard and you intend to make a triangle out of the notecard by using one long side (call it AB) as the base of your triangle and by then placing the third vertex (point E) somewhere on the opposite side (call it CD). Where should you place point E ...
*September 15, 2011*

**Chem 151**

A solution of ammonia and water contains 3.50×10^25 water molecules and 5.00×10^24 ammonia molecules. How many total hydrogen atoms are in this solution?
*September 13, 2011*

**statistics**

write a data set that fits the following description. there are 7 numbers in the data set the minimum is 17 the range is 45 the median is 32 the mode is 41
*September 9, 2011*

**math**

The city is planning to install streetlights and wants five lights along a walkway of 60 yards. If there is a light at the beginning and at the end of the walkway and the lights are evenly spaced, what is the distance between each light
*August 29, 2011*

**Chemistry**

Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4 (g) ---> 2NO2 (g) Delta H rxn: 55.3 kJ At 298 K a reaction vessel initially containing .100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. -What percentage of N2O4 decomposes at 350 ...
*July 18, 2011*

**Chemistry**

Consider the rxn during the Haber Process: N2 + 3H2 ---> 2NH3 The equilibrium constant is 3.9 x 10^(5) at 300 K and 1.2 x 10^(-1) at 500 K. Find Delta H reaction and Delta S for reaction
*July 18, 2011*

**Chemistry**

How many grams of Ba(OH)2 must be added to 2.37L of water to make a saturated solution? I got 2.03 grams. Is this correct?
*July 17, 2011*

**chemistry**

Ok, I set up the ICE table and found that Ksp of Ni(OH)2 is 5.48x10E-16. 5.48x10E-16=4S3 S=5.16x10E-6 Molar Now when you said convert this to grams I'm confused because the problem gives to the amount of grams used. I appreciate the help.
*July 17, 2011*

**chemistry**

A student adds .137 grams of nickel(II) hydroxide powder to 10.0 L of distilled water at 25C with vigorous stirring. Did all of the powder dissolve? If not, how much powder remains undissolved? If so, how much more powder can be dissolved before a saturated solution is reached...
*July 17, 2011*

**science**

which of the following absorbs hear from the surroundings as it proceeds to completion? 1. CO(g)+1/2 O2 (g)=CO2 (g) 2.AL2O3(s)=2 Al(s) + 3/2 O2 (g) 3.SO3 (g) + 99.2kJ=S (s)+3/2 O2 (g) Hrxn = -283.0 kj (endothermic)
*June 29, 2011*

**math**

Determine the equation of joint variation. Then solve for the missing value. x varies directly with y and z. x = 400 when y = 8 and z = 10. Find x when y = 10 and z = 12.
*June 21, 2011*

**physics**

What amount of energy is used if 800 C of charge passing through a load with a potential difference of 120 v? answer is 9.6e+4
*May 26, 2011*

**physics **

I think it was a joke man.. throwing a "physics book off a cliff" because its physics.. aha..ha..?
*May 11, 2011*

**arithmetic**

Write the nth term of the following sequence in terms of the first term of the sequence. 10, 20, 40, . . .
*May 6, 2011*

**Chemistry**

Thanks Dr Bob! You da man!
*May 1, 2011*

**Chemistry**

Thanks Dr. Bob! Along those same lines. Which of the following compounds have more than one isomer? PtCl5NH3, Co(NH3)4Cl2, Pt(CO)2Cl2, Rb3[Cr(CN)6] Thanks!
*May 1, 2011*

**Chemistry**

Two isomers have the same formula but different structures: Co(H2O)5SCN, CO(H2O)5NCS. The 5's mean 5-H20's. Draw each of these structures and explain the difference between the two? I don't even know where to begin. I appreciate any kind of help at this point. Thanks!
*May 1, 2011*

**Chemistry**

What is the total energy transfer(in KJ) when 10.00 pounds of water vapor at 110 degrees C becomes ice at 253K? Assume that the specific gravity of water = 1.00. The answer I got was around 12,000 KJ. Is this correct?
*April 30, 2011*

**math**

I always thought it was funny how when your younger, they prohibit the use of calculators, only to make it so when you get into Algebra 2 and higher, you HAVE to have a calculator. Aha, just think thats amusing.
*April 28, 2011*

**Chemistry**

Also shouldn't there be another phase involving the Cs of ice where the ice is cooled down to the 253k?
*April 28, 2011*

**Chemistry**

In q1, did you mean to say (110-100)? I did it assuming that and after I added all the q values I got 13,759.78 KJ as my answer. Is that correct?
*April 28, 2011*

**Chemistry**

What is the total energy transfer(in KJ) when 10.00 pounds of water vapor at 110 degrees C becomes ice at 253K? Assume that the specific gravity of water = 1.00.
*April 28, 2011*

**Chemistry**

Yeah thats the same setup I have but I'm not sure once I divide 30800/8.314 if I take that number and multiply by the other side of the equation or if I'm supposed to FOIL it out with the temps in parenthesis? Thanks!
*April 27, 2011*

**Chemistry**

Thanks Dr. B, I know to use that equation but the math is the part that I'm stuck on.
*April 27, 2011*

**Chemistry**

The normal boiling point of benzene is 80 degree C and its heat of vaporizations is 30.8 kj/mol. What is its boiling point at the top of Pikes Peak where P=260 mmHg?
*April 27, 2011*

**science**

b. mountains
*April 27, 2011*

**Geometry**

The scale factor for two similar triangles is 4 : 3. The perimeter of the smaller triangle is 12. What is the perimeter of the larger triangle?
*April 27, 2011*

**physical Science**

Explain why a ceramic bowl will keep oatmeal hot longer than a stainless steel bowl?
*April 26, 2011*

**Sociology**

What do you think they are?
*April 3, 2011*

**Sociology**

Oh I am sorry!! I think It goes but I am not sure! 1. D 2. D 3. A 4. C 5. D
*April 3, 2011*

**Sociology**

I need help with these homework questions!! 1. if a young person aspiring to a career in environmental issues joins professional society he or she should be engaging in: a. primary group behavior b. cliques c. anticipatory socialization d. none of the above 2. the variable of ...
*April 3, 2011*

**Math**

What is the volume of a rectangular solid that measures 16 ft by 14 ft by 20 ft?
*March 31, 2011*

**Chemistry**

NF3 and PF5 are stable molecules. Write the electron-dot formulas for these molecules. On the basis of structural and bonding considerations, account for the fact that NF3 and PF5 are stable molecules but NF5 does not exist
*March 23, 2011*

**Algebra**

why is 5^0=1 Not understanding it. also can you explain when (-3)^n is positive and when it is negative.
*March 14, 2011*

**chem 1**

Using equation: 2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2O Question: How many molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?
*March 1, 2011*

**high school chem 1**

Equation: 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) question: What volume of NH3 is needed to react with 71.6 liters of oxygen?
*March 1, 2011*

**High School chem 1**

2Fe(OH)3 + 3H2SO4 -> Fe2(SO4)3 + 6H2) Question: How many molecules of H2O can be made from 9.21 x 10^22 molecules of H2SO4?
*March 1, 2011*

**High school chem 1**

Hi I put the wrong equation up should read 4NH3(g) + 5O2(g) -> 4NO(g) + 6H2O(g) Question then is what mass of H2O is produced from 350 liters of NH3?
*March 1, 2011*

**High school chem 1**

4NH3(g) + 5O2(g) -> 4NO(g) + 6H20(g) what mass of H2O can be produced from 350 liters of NH3?
*March 1, 2011*

**high school chem 1 **

The above equation has the wrong question attached it should read: How many molecules of H2O is made from 9.21 x 10 (to 22nd power) molecules of H2SO4?
*March 1, 2011*

**high school chem 1 **

2Fe(OH)3 + 3H2SO4 -> Fe2(SO4) + 6H2) How many molecules of H2O can be produced from 350 liters of NH3?
*March 1, 2011*

**math**

an experiment consists of rolling a fair die until it lands on two. What is the probability that it will land on at least two is
*February 28, 2011*

**geometry**

the angle of depression from d to f measures 10 degrees. if df equals 300m, find df. round to the nearest tenth.
*February 18, 2011*

**Lit/chem**

What is a acrostic for the element cesium
*February 15, 2011*