Tuesday

April 28, 2015

April 28, 2015

Total # Posts: 868

**chemistry **

This soidum hydroxide solution was then used to determine the amount of acetic acid in vinegar. Three titrations of the sodium hydroxide solution against exactly 5mL of vinegar using phenolphthalein indicator required 22.85Ml, 22.67mL and 22.93mL of the sodium hydroxide ...
*November 25, 2012*

**English**

What is a great thesis statement for how supply and demand affects urbanization
*November 19, 2012*

**Physics**

Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.8 kg · m2 and an angular velocity of +6.7 rad/s. Disk B is rotating with an angular velocity of -8.9 rad/s. The two disks are then linked together without the aid of any external torques, so...
*November 16, 2012*

**Physics**

A 13.6-m length of hose is wound around a reel, which is initially at rest. The moment of inertia of the reel is 0.40 kg · m2, and its radius is 0.151 m. When the reel is turning, friction at the axle exerts a torque of magnitude 3.42 N · m on the reel. If the ...
*November 16, 2012*

**Physics**

A 13.6-m length of hose is wound around a reel, which is initially at rest. The moment of inertia of the reel is 0.40 kg · m2, and its radius is 0.151 m. When the reel is turning, friction at the axle exerts a torque of magnitude 3.42 N · m on the reel. If the ...
*November 15, 2012*

**Physics**

Workers have loaded a delivery truck in such a way that its center of gravity is only slightly forward of the rear axle, as shown in the drawing. The mass of the truck and its contents is 8340 kg. Find the magnitudes of the forces exerted by the ground on the following. a) the...
*November 15, 2012*

**Physics**

A rotational axis is directed perpendicular to the plane of a square and is located as shown in the drawing. Two forces, 1 and 2, are applied to diagonally opposite corners, and act along the sides of the square, first as shown in part a and then as shown in part b of the ...
*November 15, 2012*

**Physics**

A square, 0.36 m on a side, is mounted so that it can rotate about an axis that passes through the center of the square. The axis is perpendicular to the plane of the square. A force of 14.4 N lies in this plane and is applied to the square. What is the magnitude of the ...
*November 15, 2012*

**Physics**

The wheel of a car has a radius of 0.390 m. The engine of the car applies a torque of 282 N · m to this wheel, which does not slip against the road surface. Since the wheel does not slip, the road must be applying a force of static friction to the wheel that produces a ...
*November 15, 2012*

**algebra 2 trig**

8/2+√6
*October 29, 2012*

**Chemistry**

Okay. Please check. If you can please show me how its done when you put it together. I have it scattered so I was a bit stuck when I tried to do each step. I know dimensional analysis allows the cross cancelling when you do it on paper and its hard to see whats cancelled in ...
*October 26, 2012*

**Chemistry**

I don't know exactly how to start this question: A sample gas contains 2.95 x 10e24 molecules. The sample is 21.0% oxygen. Calculate volume of oxygen in liters assuming oxygen has a density of 1.308 g/L. Please help me how to do this. I have been stuck and still trying to ...
*October 26, 2012*

**Chemistry**

Ok. Please. Check. Thank you both so much. Mass of water: 43.0-26.1=16.9 g H2O Moles of water: (16.9 g H2O)(1 mol H2O/18.0 g H2O)= 0.939 mol H2O Moles of cobalt (II) sulfite: CoSO3= 58.9332+32.066+3(15.9994)=138.9974 g/mol (26.1 g CuSO3)(1 mol CuSO4/138.9974 g CuSO3)= 0.188 ...
*October 26, 2012*

**Chemistry**

A 43.0 g sample of hydrated cobalt (II) sulfite is heated to drive off the water. The anhydrous cobalt (II) sulfite has a mass of 26.1 g. Calculate the mass of water. Calculate the moles of water. Calculate the moles of cobalt (II) sulfite. Calculate the mole ratio of water to...
*October 26, 2012*

**Science**

For periodic waves, frequency has an inverse relationship to the concept of wavelength. Frequency is inversely proportional to wavelength λ (lambda). The frequency f is equal to the phase velocity v of the wave divided by the wavelength λ of the wave. f= v/w In ...
*October 25, 2012*

**Physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 92.5 kg. The mass of the rock is 0.310 kg. Initially the wagon is rolling forward at a speed of 0.550 m/s. ...
*October 22, 2012*

**Physics**

John's mass is 92 kg, and Barbara's is 67 kg. He is standing on the x axis at xJ = +7.50 m, while she is standing on the x axis at xB = +2.50 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch? Answer in ...
*October 22, 2012*

**Physics**

A girl is skipping stones across a lake. One of the stones accidentally ricochets off a toy boat that is initially at rest in the water (see the drawing below). The 0.094-kg stone strikes the boat at a velocity of 14 m/s, 15° below due east, and ricochets off at a velocity...
*October 22, 2012*

**Physics**

By accident, a large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with v1 = 2.75 m/s and v2 = 1.65 m/s. As the plate falls, its momentum has only a vertical component, and no component parallel to the floor. After the collision, ...
*October 22, 2012*

**Physics**

A 0.014 kg bullet is fired straight up at a falling wooden block that has a mass of 4.0 kg. The bullet has a speed of 760 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision ...
*October 22, 2012*

**Physics**

The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires a gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.015 kg, and its velocity is +726 m/s. Her mass (including the ...
*October 22, 2012*

**Physics**

A 42.4-kg boy, riding a 2.29-kg skateboard at a velocity of +5.37 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.30 m/s, 9.09° above the horizontal. Ignore any ...
*October 22, 2012*

**Physics**

In a science fiction novel two enemies, Bonzo and Ender, are fighting in outer space. From stationary positions they push against each other. Bonzo flies off with a velocity of +1.7 m/s, while Ender recoils with a velocity of −2.7 m/s. (b) Determine the ratio mBonzo/...
*October 22, 2012*

**Physics**

A volleyball is spiked so that its incoming velocity of +3.6 m/s is changed to an outgoing velocity of -16 m/s. The mass of the volleyball is 0.27 kg. What impulse does the player apply to the ball? Answer will be in kg*m/s
*October 22, 2012*

**Physics**

Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by seven-time-winner Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body mass. (a) How much work does he do during a 145-km race in ...
*October 20, 2012*

**Physics**

The cheetah is one of the fastest-accelerating animals, because it can go from rest to 18.2 m/s (about 41 mi/h) in 2.7 s. If its mass is 114 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in the ...
*October 20, 2012*

**Physics**

A semitrailer is coasting downhill along a mountain highway when its brakes fail. The driver pulls onto a runaway-truck ramp that is inclined at an angle of 10.0° above the horizontal. The semitrailer coasts to a stop after traveling 137 m along the ramp. What was the ...
*October 20, 2012*

**Physics**

hmm this isnt the write answer, i wonder what went wrong?
*October 20, 2012*

**Physics**

The model airplane in figure below is flying at a speed of 21 m/s on a horizontal circle of radius 18 m. The mass of the plane is 0.82 kg. The person holding the guideline pulls it in until the radius becomes 11 m. The plane speeds up, and the tension in the guideline becomes ...
*October 20, 2012*

**Calculus HELP PLEASE!!!**

Find all extrema for the function y=x^5-2x^3+3 on the interval [-10...10]
*October 18, 2012*

**Calculus HELP PLEASE!!!**

Find all extrema for the function y=x^5-2x^3+3 on the interval [-10...10]
*October 18, 2012*

**Word usage**

1-c 2-b 3-a 4-b5-b6-b7-a8-c9-d10-b11-a12-b13-b14-a15-b16-a17-b18-d19-b20-c
*October 17, 2012*

**physics...PLZ HELP! =)**

A constant force acts on a moving object. The object makes a fixed magnitude of displacement in some direction. In general, in what direction is the displacement that will result in the object traveling with the least kinetic energy after the displacement occurs? A.The same ...
*October 16, 2012*

**physics..help PLZ!!**

An object undergoes a displacement while being acted on by a constant force directed to the north. The work done on this object by the force is positive during the displacement. Which statement is necessarily true about the average velocity of the object during the ...
*October 16, 2012*

**calculus**

suppose f(x) is a function such that f(3)=5, f'(3)=0, and f''(3)=3. Is the point (3, 5) a relative maximum, minimum or inflection point?
*October 15, 2012*

**Calculus**

A metal cylindrical container with an open top is to hold 1 cubic foot. If there is no waste in construction, find the dimensions which will require the least amount of material.
*October 13, 2012*

**english**

2. According to the Pardoner, what is the best way to collect money from people? (1 point) appealing to their sense of piety openly condemning avarice and greed scaring them with prospects of divine punishment
*October 6, 2012*

**art 101**

According to the author, a. the interpretation of a work of art is objective. b. a work of art may fall into more than one theme. c. it doesn’t make sense to compare art from different cultures. d. all of these are the case: the interpretation of art is objective; a work ...
*October 5, 2012*

**Physics**

A 200 block on a 54 -long string swings in a circle on a horizontal, frictionless table at 90 A) What is the speed of the block? B) What is the tension in the string?
*October 3, 2012*

**10th Grade Literary Essay**

What does F. Scott Fitzgerald suggest about the state of the American Dream, the people who pursue it, and the impact of that pursuit through his depiction of Jay Gatsby and the people in Gatsby’s life? Include specific examples, quotations, and supporting details from ...
*September 28, 2012*

**math**

i need help in math but i dont get it
*September 26, 2012*

**Calculus**

A hot air balloon headed due east at a speed of 20 miles per hour and at a constant altitude of 180 feet passes directly over an intersection. Find an expression for the balloon's distance d (measured in feet) from the intersection t minutes later.
*September 26, 2012*

**english**

The letter is written by Max. I have to identify the simple & complete subject and verb in this sentence. Along with the verb. I am very confused.
*September 16, 2012*

**Spanish**

Letters are: a m i a t a m t d r s Need to unscramble to come up with a "member of the family" Thanks!
*September 11, 2012*

**math**

y – (–19) = 25 i'm in sixth grade
*September 10, 2012*

**physics**

A motor boat heads east across a river at 5.1 m/s. The river flows south at 2.1 m/s. Calculate the resultant speed.
*September 3, 2012*

**physics**

A plane flies south at 220 km/h and is blown west by a 90. km/h wind. Calculate the resultant speed.
*September 3, 2012*

**physics**

A boat heads directly west across a river at 8.0 m/s while the river flows directly north at 2.0 m/s. Find VR.
*September 3, 2012*

**physics**

A 26 N force and a 42 N force act concurrently at point P. The larger force is directed north and the other acts toward the east. Calculate the resultant force acting on point P.
*September 3, 2012*

**physics**

A plane is moving east at 100. km/h while the air around it moves at 30. km/h east. Find VR and draw a vector sketch.
*September 3, 2012*

**physics**

A westward force of 12 N acting simultaneously with another westward force of 4.0 N. Find FR and show a vector sketch
*September 3, 2012*

**math**

with each array write the factor pair. Rember that the # of row in the array are one factor and that the # of columns in the array is the other factor. Continue to build every possible array until you have all the possible factors of the number. 14 is the number, list the factors
*August 29, 2012*

**math**

Is the product of 9 and twice m translated 9(2m) or 9(m+m)?
*August 23, 2012*

**Math**

Its basically just fractions times each other 1/2 x 1/2 x 1/2 = 1/8 Its 1 eighth probability So 0.125 Or 12.5% Or 1/8
*August 7, 2012*

**Literature**

#11 is not correct the answer would be- realism
*August 4, 2012*

**Calculus **

Use newtons method and the function f(x)=x^2-a to derive the mechanics rule. Mechanics Rule for approaching sqrt(a), a>0, is Xn+1=1/2(Xn+a/Xn), n=1,2,3,...
*July 20, 2012*

**Calculus**

Thanks!
*July 18, 2012*

**Calculus**

Find the point on the graph of function that is closest to the point. f(x)=x^2 (2,1/2)
*July 18, 2012*

**Epidemiology**

Can anyone answer this question? The prevalence of undetected diabetes in a population to be screen ed is approximately 1.5% and it is assumed that 10,000 persons will be screened. The screening test will measure blood serum glucose content. A value of 180mg% or higher is ...
*July 12, 2012*

**Calculus**

Find the critical numbers of y=x(4-x)^1/2. The answer is x=8/3 but I got x=7/2.
*July 11, 2012*

**economics**

people are more likely to vote....when?
*July 8, 2012*

**sports**

hi the questions are based on the National Governing bodies of sports development we were give a list to chose from and i picked NGB they were some of the questions
*June 21, 2012*

**sports**

hi i am having problems with a essay on national governing bodies. can you help me with-- 1. who awards it 2. how do you achieve it. 3. what are strenghts in terms of improving quality of sports development opportunities for participants 4. and weeknessess as in question 3. I ...
*June 21, 2012*

**sports**

hello can you help??? swim 21 --- how will it be measured to see if it is -- was it -- will it be a success. thanks
*June 18, 2012*

**Physics**

v = Sqrt(v1^2 + v2^2) v = sqrt(98^2 + 100^2) V = 140.01 V = 1.4 * 10^2
*June 15, 2012*

**Tangent Line Approximation**

Given that f(−0.5) = 2 fŒ(−0.5) = 4 , using a tangent line approximation you would estimate f(0) to be?
*June 5, 2012*

**Science/Physics**

Explain why a rapidly spinning gyroscope, mounted in a frame that allows it to rotate in any direction independently of the frame’s rotation, tends to maintain its axis pointed in the same direction in space. I just am not getting this!
*June 3, 2012*

**Chemistry**

Help!
*June 2, 2012*

**Chemistry**

Just to add, salicylic acid reacts with methanol to produce methyl salicylate and water.
*June 2, 2012*

**Chemistry**

In the presence of an acid catalyst, salicylic acid reacts with methanol to produce oil of wintergreen and water. If water is added to the solution, a precipitate is formed. Identify the precipitate and explain why it is formed. Don't understand...!
*June 2, 2012*

**Calculus**

What is the limit of the following equation? Limit as x approaches infinity of ((e^x) - ln(x)) / (x^3)
*May 31, 2012*

**Health**

The 2010 Dietary Guidelines for Americans recommends that in managing one’s weight, a person should balance calories with…? A. Healthy eating B. Physical activity C. Educating oneself about health and wellness D. Community involvement c
*May 24, 2012*

**Health**

The 2010 Dietary Guidelines for Americans recommends that in managing one’s weight, a person should balance calories with…? A. Healthy eating B. Physical activity C. Educating oneself about health and wellness D. Community involvement c
*May 22, 2012*

**physics**

A tennis ball is thrown horizontally at a speed of 10 m/s from the top of a building 78.4 meters high. How long does it take the ball to hit the street?
*May 22, 2012*

**Math**

f(x) = 4 ; x = -3, -2, -1, 0, 1, 2, 3 how do i solve this?
*May 20, 2012*

**Math**

what is the slope and y intercept of this equation? x+2=0
*May 20, 2012*

**Algebra**

give the domain of the function: f(t)= 3t²+5t+2
*May 17, 2012*

**honors chemistry**

SWS fan?
*May 17, 2012*

**honors chemistry**

The term "halogen" means "salt-former" and compounds containing halogens are called "salts". All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1. The halogens exist, at room temperature, in all three states ...
*May 17, 2012*

**honors chemistry**

Their oxidation number of 0 prevents the noble gases from forming compounds readily. All noble gases have the maximum number of electrons possible in their outer shell (2 for Helium, 8 for all others), making them stable.
*May 17, 2012*

**math**

Give the slope and y-intercept of the given line. 1.2x-3y=6 2. y=-2x 3. y=3 4. x+2=0 Find the slope of the line that is a) parallel and b) perpendicular to the given line. 1. x=-8 2. y=10
*May 10, 2012*

**Homework Help**

A ruling of the FTC requires that every used car must display a(n) ________ spelling out the warranty terms under which the vehicle is offered for sale. A. vehicle identification chart B. agreement C. option chart D. buyer's guide
*May 9, 2012*

**math**

after noon would be 4 hours not 7.
*May 7, 2012*

**chemistry**

They are actually found in aqueous solutions, though they are not always written down because they form naturally. In reactions in acidic and basic equations, they are written down. The presence of hydrogen ions are actually measured by pH. They are found with hydronium ion = ...
*May 7, 2012*

**chemistry**

HCN(aq) + SO4-2(aq) HSO4-(aq) + CN -(aq) a. What is the Bronsted - Lowry acid in this equation? b. What is the Bronsted - Lowry base in this equation? c. What is the conjugate acid in this equation? d. What is the conjugate base in this equation?
*May 7, 2012*

**Honors Chemistry**

I need someone to check these questions. I know its a lot of questions. 2NH3 + Ag+ Ag(NH3)2+ a. What is the Lewis acid in this equation? [Ag+] b. What is the Lewis base in this equation? [NH3] Given H2SO4 is sulfuric acid, HNO3 is nitric acid, and H3PO4 is phosphoric acid, ...
*May 7, 2012*

**math**

A rectangular prism has 2 ends and 4 sides. Opposite sides have the same area. The surface area is the sum of the areas of all six sides. Find the area of two sides (Length*Height)*2 sides Find the area of adjacent sides (Width*Height)*2 sides Find the area of ends (Length*...
*May 7, 2012*

**Chemisrty**

How many grams of lithium metal would be produced if 0.500g of magnesium was added to a solution of lithium chloride?
*May 5, 2012*

**Chemisrty**

How many L of carbon dioxide gas will be produced from the decomposition of 5.0g of sodium hydrogen cardonate?
*May 5, 2012*

**Calculus**

Breathing is cyclic and a full respiratory cycle from the beginning of inhalation to the end of exhalation takes about 5 seconds. The maximum rate of air flow into the lungs is about 0.5 L/s. This explains, in part, why the function f(t)=(1/2)sin((2pi*t)/5) has often been used...
*April 27, 2012*

**calculus**

In a certain city the temperature (in degrees Fahrenheit) t hours after 9 a.m. was approximated by the function T(t) = 50 + 14sin((pi*t)/12). Find the average temperature (in degrees Fahrenheit) during the period from 9 a.m. to 9 p.m. I got (1/12)((12/pi)(50(12)-14cos((pi)))+(...
*April 27, 2012*

**sociology**

Explain the concept of socialization and highlight one agent of socialization that can be impactful on your life, stating how and why.
*April 26, 2012*

**Chemistry**

Using the solution: NaOH + HCl yields NaCl + H20 What mass of H20 would be produced by combining 10.0 mL of each reagent? Thanks for any help; it's greatly appreciated!
*April 25, 2012*

**Child Development**

When both parents believe that men are capable of nurturing infants a. mothers devote time to caregiving b. fathers devote less time to caregiving c. fathers devote more time to caregiving d. the marital relationship tends to suffer, particulary when me spend little time in ...
*April 23, 2012*

**Child Development**

thank you
*April 23, 2012*

**Child Development**

So then it is Roles maybe This lesson is kicking my butt
*April 23, 2012*

**Child Development**

Dean associates certain activies, roles, and traits as being typical for either males or females. His associations conform to cultural stereotypes and encompass many gender-linked responses. This is an example of gender A.Atypicality B.roles C.typing D.identity I think it is A...
*April 23, 2012*

**math**

m= y2 - y1/ x2-x1 m being slope
*April 23, 2012*

**Chemistry**

Solubility Rules: 1. Salts of group 1 and ammonia are soluble. 2. Acetates and nitrates are soluble. 3. Binary compounds of group 17, except F, are soluble with metals, except Ag, Hg+, and Pb. 4. All sulfates are soluble, except those of Ba, Sr, Pb, Ca, Ag, and Hg+ . 5. Except...
*April 23, 2012*

**Algebra2**

If f (x) = x² + 3 and g (x) = 3x - 1 then find the following: 1. (f/g)(x) 2. (f o g)(x) 3. (f o g)(1) 4. (g o f)(x)
*April 23, 2012*