Sunday

August 30, 2015
Total # Posts: 1,149

**Chemistry (Stoichiometry)**

Magnesium powder reacts with steam to form magnesium hydroxide and hydrogen gas. a) Write a balanced chemical equation for this reaction. b) What is the percentage yield if 10.1g Mg reacts with an excess of water and 21.0g Mg(OH)2 is recovered? c) If 24g Mg is used and the ...
*March 2, 2011*

**algebra**

a 9 foot board is cut in two pieces . one is 3.5 feet longer than the other . how long is the longer piece
*March 1, 2011*

**physics**

Wnc=change in energy=ef-eo =.5mvf^2 - mgh Should get -32540.68 J
*February 28, 2011*

**math**

Create your own word problem that uses a system of equations to solve. Your problem must include the following words: beach,hammock,dance,and troll.
*February 24, 2011*

**math**

s=5k+5z
*February 16, 2011*

**math**

A 75ft diagnol brace on a bridge connects a support of the center of the bridge The horizontal distance that it spans is 15ft longer than the hieght that reaches on the side of the bridge.Find the horizontal and vertical distance spanned by this brace
*February 13, 2011*

**math**

Andrew factored the expression 54x^3-30x^2+15x as 5x(9x^2-6x+3) but when Melissa applied the distributive law and multiplied out 5x(9x^2-6x+3). she got 45x^3-30x^2+15x. thus andrew's solution does not appear to check. why is this? eplain your reasoning and correctly factor...
*February 11, 2011*

**Physics**

A guitar string, destined to be an upper E string, has length 100 cm and mass 0.400 g. a. What is its mass per unit length? u = m/L = 0.004 g/cm b. What length of this string should be used on a guitar if the fundamental frequency is to be 330 Hz and its tension is to be 100 N...
*February 10, 2011*

**math**

The are of a rectangular athletic field is represented by the expression 12y^3+48y^2+24y square meters.write an algebriac expression to represent one possible set of dimensions (in the same sense''length times width'')of the althetic field. include the correct ...
*February 10, 2011*

**Physics**

A fountain contains a 3 m tall cylinder with holes placed at a height of 1 m and 2m. The water level is kept constant at a height of 3 m by an input pipe. As water shoots out from the tube, it strikes the fountain pool at some distance x away from the cylinder. Find x for each...
*February 9, 2011*

**Chemistry **

Given the following equation: 2KClO3---> 2KCl+3O2 How many moles of O2 can be produced by letting 12.00 moles of KClO3 react?
*February 8, 2011*

**Chemistry**

for each of the following balanced chemical equations write all possible mole ratios. Mg+ 2HF---> MgF^2+ H^2
*February 7, 2011*

**Chemistry 2**

Styrene, C8H8, is one of the substances used in the production of synthetic rubber. When styrene burns in oxygen to form carbon dioxide and liquid water under standard-state conditions at 25°C, 42.62 kJ are released per gram of styrene. Find the standard enthalpy of ...
*February 6, 2011*

**algebra**

(y^4+3y-5)/(y^2+7) find the quotient
*February 6, 2011*

**physics**

CALCULATE THE ACCELERATION FOR A 10.0 KG BLOCK WHICH IS BEING PULLED UP A 35.0 DEGREE SLOPE BY A FORCE OF 140 N IF THE COEFFICIENT OF SLIDING FRICTION IS 0.100
*February 6, 2011*

**physics**

CALCULATE THE ACCELERATION FOR A 10.0 KG BLOCK WHICH IS BEING PULLED UP A 35.0 DEGREE SLOPE BY A FORCE OF 140 N IF THE COEFFICIENT OF SLIDING FRICTION IS 0.100
*February 6, 2011*

**math**

how do I solve (4x^2-9y^2)/2x+3y)
*February 3, 2011*

**math**

how do I solve (4x^2-9y^2)/2x+3y)
*February 3, 2011*

**Chemistry**

What are the products for the combustion of a a hydrocarbon.
*February 1, 2011*

**Science**

when a cell has a specific function, it is called what?
*February 1, 2011*

**math**

(1/3 +5/6)divided by 2/5=? in simplest form
*January 31, 2011*

**7th grade math**

21/8 divided by 5/6=? in simplest form
*January 31, 2011*

**Calculus**

A ladder 41 feet long that was leaning against a vertical wall begins to slip. Its top slides down the wall while its bottom moves along the level ground at a constant speed of 4 feet per second. How fast is the top of the ladder moving when its 9 ft above the ground?
*January 30, 2011*

**Physics**

Two balls, each with mass 0.5g and carrying charge Q, are hung on strings 35cm and suspended from one point. The balls repel and form a 40 degree angle between them. What is the charge? CAN YOU WALK ME THROUGH THIS QUESTION?
*January 30, 2011*

**math**

find the difference (6x^2-3x-9)-(2x^2+8x+3)
*January 27, 2011*

**physics**

A typical sugar cube has an edge length of 1.0 cm. If you had a cubical box that contained 1.7 mol of sugar cubes, what would its edge length be? (One mole = 6.02 x 1023 units.) and A severe thunderstorm dumped 2.6 in of rain in 30 min on a town of area 32 km2. What mass of ...
*January 26, 2011*

**Chemistry**

I'm really not getting how to solve these chemical equations. If someone could explain to me their method of solving. I know you have to list the number of reactants and products for each side but I get confused what you add and what determines what you add. Stuff like ...
*January 25, 2011*

**Chemistry**

if each "hydrogen" atom has a mass of 1g and each "carbon" atom has a mass of 12g what is the ratio of the mass of 1 mole of carbon to one mole of hydrogen
*January 25, 2011*

**Physics**

After driving 20.0 km west, a car turns southwest and proceeds another 80.0 km. What is the displacement (in kilometers) of the car from the point of origin (magnitude only)?
*January 24, 2011*

**grammar**

Trumpets and trombones are part of our band. In some ways this feels like part is a direct object, but it also seems like this could be an intransitive sentence.
*January 22, 2011*

**grammar**

transitive :)
*January 22, 2011*

**grammar**

Miss, give me that cake. In this sentence, is the subject "you" since it is imperative, or is the subject Miss. If you think of the sentence like this: (You) give me the cake, miss, it seems like it would be intransitive with an active verb. Is that right?
*January 22, 2011*

**Grammar**

Can What be a subject? Or is song the subject?
*January 22, 2011*

**Grammar**

Is it also intransitive?
*January 22, 2011*

**Grammar**

I'm working with linking, transitive and intransitive verbs. For this sentence, do I need to write it as a statement? I think it is a linking verb. Intransitive? "What is the most popular song in the country this week?"
*January 22, 2011*

**math**

A plane travels at a rate of 425 miles per hour. Write an expression to show the distance it travels, if t reprents hours.
*January 19, 2011*

**math**

jonna and elizabeth found a level campsite and pitched thier tent as shown below.if m <2 explain your reasoning
*January 18, 2011*

**math**

a man hods a rifle in a horizontal postion 4 feet above the ground and shoots the bullet with an initial velocity of 2000 fps horizontally. it may be assumed that the ground is level, what will be the horizontal distance from the man to the point at which the bullet strikes ...
*January 10, 2011*

**Pre algebra(3)**

$29/kg is how many cents/g
*January 9, 2011*

**algebra (inequalities)**

a. 120p> 175 b. p> 1.46
*January 9, 2011*

**Geometry**

If AB = 3x +8 and GJ = 2x +24 what is AB? AB and GJ are ||
*January 6, 2011*

**math **

125x.1 explain the decimal movement when multiplying by .1
*January 6, 2011*

**7th grade math**

500 divided by 100 explain the decimal movement when dividing by 100.
*January 6, 2011*

**7th grade math**

125x.1 explain the decimal movement when mutiplying by.1
*January 6, 2011*

**7th grade math**

50 divided by 10 EXPLAIN THE DECEMAL MOVEMENT WHEN DIVIDING BY 10.
*January 6, 2011*

**geometry**

In isosceles triangle ABC, AB = BC, and D is a point between A and C on AC. Can you conclude MO > ML, MN > MO, angle L > angle BDA, or angle N > angle BDC
*January 5, 2011*

**math**

in the question 6radical x +3 radical y -2radical y +3 radical x -radical y is the answer 9 radical x +1 radical y. i just dont get it thanks
*January 3, 2011*

**science**

how does the distribution of animal tissues in an organism difer from the distribution of tissues in a plant
*December 20, 2010*

**Math**

7a/4
*December 20, 2010*

**math**

what's the final answer??
*December 16, 2010*

**english**

I need help really quick unscrambling this word!!! AAAATTTLIIRRONNME Its two words and its the name of a mall. the first words starts with I and the second starts with M.
*December 15, 2010*

**math**

substitution
*December 12, 2010*

**math**

Solve the following linear system of equations. 3x-2y+z=2 x-y+z=2 5x+10y-5Z=10
*December 12, 2010*

**Math**

Let f(x)=-(x-1)^2+4 Solve f(x)=0 to find the x-intercepts
*December 12, 2010*

**Math**

A lottery prize worth $1,000,000 is awarded in payments of $10,000 five times a year for 20 years. Suppose the money is worth 20% compounded five times per year. What is the formula used to find the present value of the prize?
*December 12, 2010*

**Math**

How much would have to be invested at the end of each year at 6% interest compounded annually to pay off a debt of $80,000 in 10 years?
*December 12, 2010*

**Legal aspects healthcare**

You are so right. It has to be true.
*December 11, 2010*

**Legal aspects healthcare**

Healthcare professionals who have a “need to know” access to medical records have a legal and an ethical obligation to protect the confidentiality of the patient information. I think it is not true, right?
*December 11, 2010*

**chemistry **

Predict the product: hydrogen peroxide (catalyzed by manganese dioxide)
*December 5, 2010*

**Geography**

region
*December 2, 2010*

**algebra**

43-n= 27
*November 30, 2010*

**English**

I need to find 2 medaphors in the book Among the Enemy by Margaret Peterson Haddix. I can't find them after I've read it twice.
*November 28, 2010*

**Science**

Thank you. That helped a lot.
*November 22, 2010*

**Science**

I have to write a project proposal about the global climate crisis so I can do a report and powerpoint. I need suggestions on what to write about by answering the following questions.... How do I affect the water and carbon cycle and what can I do to lesson my negative impact ...
*November 22, 2010*

**Physics**

A centrifuge rotor rotating at 10700 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.48 m * N. 1. If the mass of the rotor is 5.61 kg and it can be approximated as a solid cylinder of radius 0.0820 m, through how many revolutions will ...
*November 22, 2010*

**Physics**

A bicycle with tires .064 m in diameter travels 8.1 km. 1. How many revolutions do the wheels make?
*November 22, 2010*

**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*

**Grammer**

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*

**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*