Questions Asked in 2011
Most Popular Questions of 2011

freedom similes and metaphors?
I'm stuck on what to write for freedom similes and metaphors? help? Thanks!
asked by Skye on April 3, 2011 
Chemistry
write the balanced equation for the ionization of the weak base pyridine, C5H5N, in water
asked by Kristin on May 8, 2011 
Chemistry
The speed of light is 3.00x 10^8 m/s . How fast is this in miles per hour (miles/h)? Use the conversion . 1mile =1610m
asked by Okoye on August 31, 2011 
Chemistry
Classify the possible combinations of signs for a reaction's ∆H and ∆S values by the resulting spontaneity. A) Spontaneous as written at all temperatures. B) Spontaneous in reverse at all temperatures. C) Spontaneous as written above a certain
asked by Jessica on November 9, 2011 
calculus
a boat leaves a dock at 2:00 pm and travels due south at a speed of 20 km/h. Another boat has been heading due east at 15 km/h and reaches the same dock at 3:00 pm. at what time were the two boats closest together
asked by LALA on November 14, 2011 
Physic
A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on
asked by Don on September 28, 2011 
Calculus
A stone is dropped from the upper observation deck of a tower, 200 m above the ground. (Assume g = 9.8 m/s^2.) a)Find the distance (in meters) of the stone above ground level at time t. b)With what velocity does it strike the ground? (Round your answer to
asked by John on November 13, 2011 
Physics
Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 402 N and F2 = 364 N. (Assume up and to the right as positive directions.)(F1 is 10degrees and F2 is 30degrees) (a) What is the resultant of these two
asked by Dani on May 3, 2011 
Chemistry
Write a balanced net ionic equation (include physical states) for the following reaction: Fe(NO3)3(aq) + LiOH(aq) → LiNO3(aq) + Fe(OH)3(s)
asked by Emily on June 27, 2011 
social studies
give me examples of physical features?
asked by jennifer white on September 27, 2011 
chemistry
Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction: 2 NO(g) + O2(g) → 2 NO2(g), ΔH°rxn = ? Given: N2(g) + O2(g) → 2 NO(g), ΔH°rxn = +183 kJ 1/2 N2(g) + O2(g) → NO2(g), ΔH°rxn = +33 kJ
asked by Amber on June 14, 2011 
Math
Does anyone know the answer to the math riddle "Did you hear about..." the answer is 12 words and it's pg 167.
asked by Maddie on December 6, 2011 
calculus
Let f be a differentiable function such that f(3) = 2 and f'(3) = 5. If the tangent line to the graph of f at x = 3 is used to find an approximation to a zero of f, that approximation is? So confused
asked by Matt on April 21, 2011 
chemistry
Ammonia chemically reacts with oxygen gas to produce nitric oxide and water . What mass of ammonia is consumed by the reaction of 4.5g of oxygen gas? Round your answer to significant digits.
asked by Anonymous on September 27, 2011 
English Check
My Answer: 1. Venture 2. calamity 3. turmoil 4. Flagrant 5. comprehensive 6. rehabilitate 7. fluctuate 8.ponder 9.persevere 10. Conventional We tried to stop Anna from jumping, but her 1)___ disregard of our warnings led to a 2)__ that would change her
asked by ME on September 14, 2011 
physics
A sports car moving at constant speed travels 120 m in 5.1 s. If it then brakes and comes to a stop in 4.0 s, what is its acceleration? Express the answer in terms of g's, where g = 9.80 m/s2. (Take the positive direction to be the direction of travel.)
asked by Hal on August 18, 2011 
calculus
The function f is continuous on the closed interval [0,2] and has values that are given in the table below x = 0 1  2 ____________ f(x) = 1 k  2 The equation f(x) = 1/2 must have at least two solutions in the interval [0,2] if K = ? The answer is 0,
asked by Joan on April 20, 2011 
chemistry
The solubility of KI is 50 g in 100 g of H2O at 20 ?C. If 110 grams of KI are added to 200 grams of H2O, what would happen?
asked by Glo on June 20, 2011 
physics
A 3.1kilogram gun initially at rest is free to move. When a 0.015kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?
asked by ashley  HELP PLEASEE!!! on May 7, 2011 
physics
You are traveling on an airplane. The velocity of the plane with respect to the air is 180 m/s due east. The velocity of the air with respect to the ground is 40 m/s at an angle of 30° west of due north. 1)What is the speed of the plane with respect to
asked by aaa on September 17, 2011 
Physics
A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. Assume the plane is traveling horizontally with a speed of 195 km/h (54.2 m/s). Suppose, instead, that the plane releases the supplies a horizontal distance
asked by Bridge on September 17, 2011 
Calc
If a rock is thrown upward on the planet Mars with a velocity of 17 m/s, its height (in meters) after t seconds is given by H = 17t − 1.86t^2. (a) Find the velocity of the rock after one second. (b) Find the velocity of the rock when t = a. (c) When will
asked by Katrina on October 17, 2011 
maths
Which angle between 0° and 360° has the same cosine as the angle 58°? give your answer as an integer. how do i do this please?
asked by susan on May 8, 2011 
Chemistry
Many power plants produce energy by burning carbonbased fuels, which also produces CO2. CO2 is a greenhouse gas, so overproduction can have negative effects on the environment. Use enthalpy of formation data to calculate the number of moles of CO2 (g)
asked by Harold on January 27, 2011 
Chemistry
How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^5. I just wanted to make sure I dd this write, can you please check my work? Thank
asked by Jessica on October 8, 2011 
chemistry 105
Lithium reacts with nitrogen gas according to the following reaction: 6Li(s)+N2(g)>2LiN(s) What mass of lithium (in g ) is required to react completely with 59.9 mL of N2 gas at STP?
asked by JULIE on October 23, 2011 
English check please help me out
My answers: 1. Suffice 2. Sinister 3. Intricate 4. Incoherent 5. Implausible 6. Degenerate 7. Intercede 8. Sanctuary 9. Vulnerable 10. Scrutiny One summer, Nan worked in a factory with an employee who had recently arrived from France, a soft spoken young
asked by ME on October 6, 2011 
English check please I've corrected it again
. Dispatch 2. Orient 3. Enigma 4. Discern 5. Enhance 6. Attribute 7. Nocturnal 8. Exemplify 9. Mobile 10. Attest Animals Possess sensory powers that humans lack. Homing pigeons fly with great speed and accuracy when 1)___(e)d with messages to faraway
asked by ME on September 14, 2011 
English grammar
I need to identify the subject, verb, and any complements (direct object, indirect object, subject complement, objective complement) and the prepositional phrases of the following sentances. I thought i had them more or less right but when i turned them in
asked by Eddie on July 5, 2011 
Calculus 1
A fence is to be built to enclose a rectangular area of 220 square feet. The fence along three sides is to be made of material that costs 6 dollars per foot, and the material for the fourth side costs 13 dollars per foot. Find the dimensions of the
asked by Olivia on October 31, 2011 
Chemistry
The Hydrolysis Reactions  Write netionic equations for the reaction of each salt with water below. If there is no reaction, write N.R. 1. NH4C2H3O2 2. NH4Cl 3. NaCl 4. Na2CO3 5. NaC2H3O2 6. NaHSO4 7. FeCl3 8. NaH2PO4 9. NaHCO3
asked by K on April 30, 2011 
math
Michael has a total of $2000 on deposit with two saving institutions. One pays interest at the rate of 6% per year whereas the other pays interest at a rate of 8% per year. If Michael earned a total of $144 in interest during a single year, how much did he
asked by SUBSTITUTION METHOD on May 16, 2011 
Math
How did the Hunter get hurt while benind over to study some tracks? Algebra with Pizzazz! pg 123 OBJECTIVE: to divide a polynomial by a binomial EX: (x^2+8x+150/(x+5)
asked by k on January 2, 2011 
English
Need some advice! What to do the with the class for the first time? I don't know the class and they don't know me. They are not children. The youngest person is 20 and the oldest around 3540 There are 10 of them in the group and they are learning English
asked by tee on February 27, 2011 
physics
A father racing his son has 1/3 the kinetic energy of the son, who has 1/3 the mass of the father. The father speeds up by 1.4 m/s and then has the same kinetic energy as the son. What are the original speeds of (a) the father and (b) the son?
asked by nan on October 3, 2011 
Physics Honors
A lovesick lad wants to throw a bag of candy and love notes into the open window of his girlfriend's bedroom 10 m above. Assuming it just reaches the window, he throws the love gifts at 60° to the ground: a) At what velocity should he throw the bag? b)
asked by Jacqueline on December 2, 2011 
math
What might you have if you don't feel well?
asked by lolololol on January 15, 2011 
general chem
Determine the oxidation number for the indicated element in each of the following compounds: (a) Co in LiCoO2, (b) Al in NaAlH4, (c) C in CH3OH (methanol), (d) N in GaN, (e) Cl in HClO2, (f) Cr in BaCrO4.
asked by rob on October 9, 2011 
physic
Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?
asked by noah on July 2, 2011 
chemistry
Write molecular, ionic, and net ionic equations. AgNO3(aq) + KBr(aq) >
asked by Brea on June 20, 2011 
Physics
A 0.28kg stone is held 1.5 m above the top edge of a water well and then dropped into it. The well has a depth of 4.8 m. (a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone–Earth system before the stone
asked by Anonymous on September 27, 2011 
Physics
There are two forces on the 2.36 kg box in the overhead view of Fig. 531 but only one is shown. For F1 = 18.6 N, a = 11.4 m/s2, and θ = 26.7°, find the second force (a) in unitvector notation and as (b) a magnitude and (c) a direction. (State the
asked by Anonymous on September 28, 2011 
Chemistry
Part A Calculate the standard enthalpy change for the reaction 2A+B >2C +2D Use the following data: Substance Delta H(kJ/mol) A 263 B 391 C +203 D 523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART BTHIS ONE I NEED
asked by tina on June 16, 2011 
vocab
The living room looked immaculate except for a lump under the carpet, an gaunt
asked by me on October 19, 2011 
Physics
Two electrostatic point charges of +60.0 uC and +50.c uC exert a repulsive force on each other of 175 N. What is the distance between the two charges?
asked by Pablo on January 16, 2011 
CHEM please!!! help
Calculate the lattice energy of potassium oxide from the following data: Enthalpy of sublimation of potassium: +89.24 kJ/mol Bond energy of oxygen: +498 kJ/mol First ionization energy of potassium: +419 kJ/mol 1st electron affinity of oxygen: 141 kJ/mol
asked by Joanie on April 19, 2011 
physics
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 12 m/s at an angle 35 degrees; with respect to the horizontal. Sarah catches the ball 1.5 meters above the ground. 1)What
asked by aaa on September 17, 2011 
Chemistry
Write the net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydrobromic acid are combined. I know that the first part of the formula would be BaOH + HBr but I do not know what the product would be since HBr is
asked by Hannah on October 9, 2011 
physics
when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is
asked by joe on November 6, 2011 
Physics
A boat moves through the water with two forces acting on it. One is a 1500 N forward push by the motor, and the other is an 1400 N resistive force due to the water. (a) What is the acceleration of the 1100 kg boat? m/s 2 (b) If it starts from rest, how far
asked by Savannah on October 7, 2011 
Chemistry
1)How many protons and electrons are in a sulfate ion SO4^2 ? I know the answer is 48 protons and 50 electrons but i do not know how to get this from the ion. 2) What is the charge on a sulfide ion? The answer is 2 but im not sure why. Is sulfide always
asked by Hannah on December 4, 2011 
math
Find two numbers the exact answer is between. 3 X 567
asked by andrew on October 5, 2011 
phy
A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 meters above the
asked by a on September 13, 2011 
Operations Management
Joe Henry's machine shop uses 2,500 brackets during the course of a year. These brackets are purchased from a supplier 90 miles away. the following information is known about the brackets. annual demand 2,500 holding cost per bracket per year $1.50 order
asked by Jeff on July 6, 2011 
physics
An object with mass m1=5.00 kg rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2= 10.0 kg. Find the acceleration of each object and the tension in the cable.
asked by Dee on September 26, 2011 
Physics
A 1200 kg car pushes a 2100 kg truck that has a dead battery to the right. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4500 N . What is the magnitude of the force the car applies to the
asked by Help Physics college on November 1, 2011 
physics
A bike first accelerates from 0.0 m/s to 5.0 m/s in 4.5 s, then continues at this constant speed for another 4.5 s. What is the total distance traveled by the bike?
asked by lindsey on September 5, 2011 
Chemistry
(a) Calculate the molarity of a solution that contains 0.175 mol ZnCl2 in exactly 150 mL of solution. (b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid? (c) How many milliliters of 6.00 MNaOH solution are needed to
asked by Anon on October 31, 2011 
Physics
Hot air balloons float in the air because of the difference in density between cold and hot air. In this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. To do this, use the following variables
asked by Jenny on July 13, 2011 
math
what is the answer to What Do You Get if a Bunch of Bad Guys Fall in the Ocean?
asked by jeremy on April 25, 2011 
Chemistry
A sample of propane,C3H8, contains 14.4 moles of carbon atoms. How many total moles of atoms does the sample contain?
asked by The Desperado on September 30, 2011 
Chemistry
Rank the following fertilizers in decreasing order of mass percentage of nitrogen: NH3 NH4NO3 (NH4)2HPO4 KNO3 (NH4)H2PO4 (NH4)2SO4
asked by Anonymous on January 16, 2011 
Chem
Bromine has two natural occurring isotopes (Br79 and Br81) and has an atomic mass of 79.904 amu. The mass of Br81 is 80.9163 amu, and its natural abundance is 49.31%. Calculate the mass and natural abundance of Br79.
asked by Davis on August 28, 2011 
Calculus
A parcel delivery service will deliver a package only if the length plus the girth (distance around, taken perpendicular to the length) does not exceed 100 inches. Find the maximum volume of a rectangular box with square ends that satisfies the delivery
asked by Anonymous on November 1, 2011 
Calculus
A ball is thrown straight down from the top of a 220foot building with an initial velocity of 22 feet per second. What is its velocity after 3 seconds? What is its velocity after falling 108 feet?
asked by Susana on October 3, 2011 
statistics
72% working women use computers choose 5 at random whats the probility at least 1 does not use a computer whats the probility that all 5 use a computer
asked by max on September 17, 2011 
cheistry
Write a net ionic equation for the overall reaction that occurs when aqueous solutions of hydrosulfuric acid and potassium hydroxide are combined. Assume excess base.
asked by savannah on November 17, 2011 
calculus
The sides and diagonal of the rectangle above are strictly increasing with time. At the instant when x=4 and y=3, dx/dt=dz/dt and dy/dt=k(dz/dt). What is the value of k at that instant. solved for z with pythagorean theorem and stuck at that step. z=5
asked by Repost on April 27, 2011 
physics
Archer pulls her bow string back 0.4 m by exerting a force that increases uniformly from zero to 230 N. What is the equivalent spring constant of the bow? This is what I did: F = kx 230 N = k(0.4 m) 575 = K My question is this: Is the answer just 575 or is
asked by Nabil on February 21, 2011 
Physics
Block 1 of mass m1 slides from rest along a frictionless ramp from height h and then collides with stationary block 2, which has mass m2 = 3m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction is μk and comes to
asked by Isabel on November 1, 2011 
Math
Two fire towers are 30 kilometers apart, tower A being due west of tower B. A fire is spotted from the towers, and the bearings from A and B are E 14 degrees N and W 34 degrees N, respectively. Find the distance d of the fire from the line segment AB.
asked by Mike on May 10, 2011 
College Physics
Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in a glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving with a speed vi. After the collision, the orange disk moves along a
asked by Josh on May 18, 2011 
Spanish
doy a la profesora los libros de español. Amelia pregunta a nosotras si queremos ir al cine. El empleado busca trabajo a sus primas en el almacén. Julio quiere traer un televisor nuevo a sus padres. Los clientes dicen a nosotros que todo está muy caro.
asked by Anonymous on September 22, 2011 
Math
Write the fact family for 3, 9, , and 12.
asked by khrys on October 4, 2011 
calculus
A rectangular beam is cut from a cylindrical log of radius 25 cm. The strength of a beam of width w and height h is proportional to wh2. (See Figure 4.70.) Find the width and height of the beam of maximum strength.
asked by Maria on November 1, 2011 
physics
if a car generates 18 hp when traveling at a steady 88 km/h, what must be the average force exerted on the car due to friction and air resistance
asked by eli on December 9, 2011 
Alg2
How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be on an end?
asked by Rock on December 4, 2011 
math
If the line 3x4y = 0 is tangent in the first quadrant to the curve y = x^3 + k, then k is
asked by S on December 28, 2011 
Chemistry
Write a balanced equation showing how you could prepare each of the following salts from an acidbase reaction: KNO3, NaBr, CaS.
asked by Stacey on April 5, 2011 
pysics
A projectile of mass 0.777 kg is shot from a cannon, at height 6.6 m, as shown in the ﬁgure, with an initial velocity vi having a horizontal component of 7.8m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and
asked by steve on October 4, 2011 
math
The radius r of a sphere is increasing at the uniform rate of 0.3 inches per second. At the instant when the surface area S becomes 100pi square inches, what is the rate of increase, in cubic inches per second, in the volume V?
asked by Tim on December 29, 2011 
PHYSICS
A 900 kg car pushes a 1900 kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push against the ground with a force of 4800 N. (a) What is the magnitude of the force of the car on the truck? (b) What is
asked by Kate on June 21, 2011 
physics
A 0.50 kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules. Approximately how high will the ball rise ?
asked by lucy on April 30, 2011 
physics
a pet truck is moving at 25m/s north, a dog inside moves at 1.75 m/s at angle 35 degrees east of north. What is the velocity of the dog relative to the road?
asked by anna on November 13, 2011 
can you please look over my answers? clauses
Can you please look over the answers that I have for the different clause questions? Thanks ahead of time! Ohh, & Ssubject, DOdirect object, PNpredicate noun, OPobject of preposition. Thank you! [What I wanted to do] was to finish my work. S The
asked by Amy on December 11, 2011 
Chemistry
will a red blood cell undergo crenation, hemolysis, or no change in each of the following solutions? 1% (m/v) glucose 2% (m/v) NaCl 5% (m/v) NaCl .1% (m/v)NaCl
asked by Curlyqty on May 9, 2011 
chemistry
Consider the reaction, C2H4 (g) + H2 (g) C2H6 (g) where 137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?
asked by Sandy on July 10, 2011 
Physics
A driver of a car going 90.0km/h suddenly sees the lights of a barrier 40.0 metres ahead. It takes the driver 0.75 seconds before she applies the brakes, and the average acceleration during braking is 10.0 m/s squared. Does the car hit the barrier?SHow
asked by Steph on February 13, 2011 
Math
By default, your numerical entry is scored as correct if it is within 1% of the correct answer. A rule of thumb is always to enter at least 3 digits for numerical questions. If the correct answer is 7.48809, which of the following entries would be counted
asked by Angel on September 28, 2011 
Math
A pile of 108 identical books has a mass of 30 kg. Find (a)the mass of 150 books and (b)the number of books that has a mass of 20 kg
asked by Julie Charmster on May 15, 2011 
Chemistry
Assuming equal concentrations , rank these solutions by pH. RbOH(aq), NH3(aq), HF(aq) HBr(aq), Ca(OH)2(aq). I know the most acidic solution has the lowest pH and the most basic solution has the highest pH. But how am i supposed to know the pH if i don't
asked by Nia on October 17, 2011 
physics
In an arcade game a 0.142 kg disk is shot across a frictionless horizontal surface by compressing it against a spring and releasing it. If the spring has a spring constant of 174 N/m and is compressed from its equilibrium position by 8 cm, find the speed
asked by rm on December 25, 2011 
cell biology
What is the mass of 2.00 L of an intravenous glucose solution w/ a density of 1.15 g/ml?
asked by Ann on February 25, 2011 
Chemistry
Write a balanced chemical equation for the reaction of propylamine with water. Is propylamine > CH3CH2CH2NH2? Is the equation CH3CH2CH2NH2 + H2O > CH3CH2CH2NH3+ + OH right? Isn't this balanced?
asked by Steph on November 13, 2011 
Physics
In the figure, a chain consisting of five links, each of mass 0.100 kg, is lifted vertically with constant acceleration of magnitude a = 2.50 m/s2. Find the magnitudes of (a) the force on link 1 from link 2, (b) the force on link 2 from link 3, (c) the
asked by Sarah on March 19, 2011 
physics
You are trying to ﬁnd out how high you have to pitch a water balloon in order for it to burst when it hits the ground. You discover that the balloon bursts when you have pitched it to a height of 14 m. With what velocity did the balloon hit the ground?
asked by jj on October 2, 2011 
physics
Two forces, of magnitudes F1= 80.0N and F2= 50.0N, act in opposite directions on a block, which sits atop a frictionless surface, as shown in the figure. Initially, the center of the block is at position x1= 3.00cm. At some later time, the block has moved
asked by physics please show steps on June 15, 2011 
Geometry
On a rectangular piece of cardboard with perimeter 11 inches, three parallel and equally spaced creases are made. The cardboard is then folded along the creases to make a rectangular box with open ends. Letting x represent the distance (in inches) between
asked by Valerie on January 21, 2011 
Calculus
Suppose f(pi/3) = 3 and f '(pi/3) = −7, and let g(x) = f(x) sin x and h(x) = (cos x)/f(x). Find the following. a. g'(pi/3) b. h'(pi/3)
asked by Christina on November 7, 2011 
Chemistry
Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ion K+ NH+4 Mg2+ Fe3+ Cl OH CO3 2 PO3 4 Complete the fourth row of the table.
asked by Lauren on November 16, 2011