Questions Asked on
November 18, 2011

chemistry
CH4 + 2O2 > CO2 + 2H2O Delta H H2O= 285.8 kJ/mole Delta H CO2= 393.3 kJ/mole What is the standard heat of formation of methane, Delta H CH4, as calculated from the data above
asked by kc 
calculus
an open box is to be made from a piece of metal 16 by 30 inches by cutting out squares of equal size from the corners and bending up the sides. what size should be cut out to create a box with the greatest volume? what is the maximum volume?
asked by lulu 
Chemistry
In the industrial synthesis of ammonia, the equilibrium constant expression may be written as: Keq= [NH3]^2/[N2][H2]^3 Calculate the value of this equilibrium constant, if the equilibrium concentration of nitrogen in the reaction mixture at 600°C if [N2]
asked by Chemistry Chick 
chemistry
use oxidation states to identify the element that is being oxidized and the element that is being reduced in the redox reaction Sn + 4HNO3 > SnO2 + 4NO2 + 2H2O I see that SN is oxidized 0 > 4+ and book says N is reduced +5 > +4 I don't see that.
asked by Monique 
Math
In a volleyball a player on one team spikes the ball over the net when the ball is 10 ft above court. The spike drives the ball downward with initial vertical velocity of 55 feet per second. Players on the opposing team must hit the ball back over the net
asked by Lynn 
physics
A rotating uniform cylindrical platform of mass 240 kg and radius 5.7 m slows down from 3.9 rev/s to rest in 16 s when the driving motor is disconnected.
asked by Ari 
US GOV
Which of the following statements concerning the Twentyfifth Amendment is incorrect? a. It allows the vice president to serve as acting president in the case of presidential disability. b. It allows the vice president alone to declare the president
asked by Brooke 
Chemistry
Rank the following atoms in terms of decreasing atomic radius. 1. Na, N, O, Mg, F 2. F, O, N, Mg, Na 3. F, Mg, Na, O, N 4. Na, Mg, N, O, F 5. F, O, N, Na, Mg
asked by Bob 
geometry
B is the midpoint of and D is the midpoint of . Solve for x, given BD = 3x + 5 and AE = 4x + 20.
asked by Anonymous 
Physics
A man stands on a platform that is rotating (without friction) with an angular speed of 1.21 rev/s; his arms are outstretched and he holds a brick in each hand The rotational inertia of the system consisting of the man, bricks, and platform about the
asked by Aimee 
psychology
I need help with this! A recent controversy in the media surrounded the complaints of serious physical symptoms in veterans returning from the 1991 Gulf War. Allegations that the physical symptoms were due to exposure to chemical or biological agents could
asked by Marilyn 
Chemistry AP HELP!
Tausonite, a mineral composed of Sr, O, and Ti, has the cubic unit cell and the chemical formula is SrTiO3..... Ti is coordinated by 6 O atoms, because the Ti is located at the center of the unit cell. To see the full coordination environment of the other
asked by kali mata 
chemistry
Consider 4.00L of a gas at 365mmHg and 20*C. If the container is compressed to 2.80L and the temperature is increased to 35*C, what is the new pressure,P2 , inside the container? Assume no change in the amount of gas inside the cylinder
asked by unknown 
Physics
A 26.0 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.490 and the coefficient of kinetic friction between the table and the block is
asked by Millie 
Physics
A hoop of mass M = 3 kg and radius R = 0.5 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is
asked by Nho Neim 
chemistry
calculate the mass of solid NaCl that must be added to 1.5L of 0.100M AgNO3 solution to precipitate all the Ag+ ions in the form of AgCl?
asked by NONO 
chemistry
The mole fraction of nitrogen in air is 0.7808. calculate the partial pressure of N2 in air when the atmospheric pressure is 760 torr?
asked by NONO 
chemistry
Consider the following reaction 4Al + 3O2 = 2Al2O3 It takes 2.00 L pure oxygen gas at STP (0C ,1atm ) to react completely with a certain aluminum. What is the mass of aluminum reacted?
asked by NONO 
chemistry
Imagine that you have a 5.00L gas tank and a 3.50L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145atm , to what
asked by unknown 
statistics
If on an average, one ship out of 10 is wrecked. Find the probability that out of five ships expected to arrive the post at least four wil arrive safely.
asked by Anonymous 
math
the regular price of a ZebraFX skateboard is $180, but is on sale at a 25% discount A. How much is the discount? B. What is the sale price?
asked by sarah 
psychology
Describe how you might design a community health campaign. In your description, consider both risky behaviors and health promoting behaviors. I really need help with this. Thanks!
asked by Marilyn 
chemistry
calculate the halflife of a first order reaction if the concentration of the reactant is 0.0396 M at 12 seconds after the reaction starts and is 0.00579 M at 47 after the reaction starts. How long does it take for the reactant concentration to decrease
asked by saud 
chem 121
Iron and oxide react to form iron(lll) oxide: 4Fe(s) + 3O2(g)+ 2FeO2(s) Determine the limiting reactant in each of the following mixtures of reactants: 2.0 moles of Fe and 6.0 moles of O2
asked by claire 
chemistry
What volume of ammonia at 7.0 atm and 235C would you get from 333g of nitrogen reactin with enough mass of hydrogen?k calculate the density of hydrogen at STP?
asked by NONO 
math
The area is 17m2. iT HAS TO BE A SQUARE. WHAT IS THE PERIMETER
asked by Dylan Hughes 
Psychology
Sarah has noticed at work that office meetings held in the late morning go more quickly than those scheduled after lunch. She tells her boss she'll bet that, if he holds his meetings at 11a.m., the group will spend more time on the agenda and less
asked by Amy 
Calculus AB
Find a, b, c, and d such that the cubic function ax^3 + bx^2 + cx + d satisfies the given conditions Relative maximum: (2,4) Relative minimum: (4,2) Inflection point: (3,3) So this is what I have so far: f'(x) = 3a^2 + 2bx + c f''(x) = 6ax + 2b f(2) = a(8)
asked by Savannah 
Math
Find the discriminant of the quadratic equation and give the number and type of solutions of the equation. s^2√5 + s + √5 = 0 I'm confused because of the radical...
asked by Linda 
chemistry(reacting masses)
When a 1 g sample of limestone was dissolved in dilute hydrochloric acid completely,0.38 g of carbon dioxide was generated.What was the percentage by mass of calcium carbonate in limestone?(Relative atomic masses : C=12, O=16,Ca=40.1)
asked by mary 
Chemistry
a real gas would behave most like an ideal gas under conditions of
asked by tom 
chemistry
Write a balanced net ionic equation for the following reactions in acid soln Hydrogen Peroxide reacts w/an aqueos soln of sodium hypochlorite to form oxygen and chlorine gas
asked by anonymous 
Chemictry
A calorimeter contains 32.0 of water at 11.5. When 1.70 of (a substance with a molar mass of 74.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 26.5. Calculate the enthalpy change, , for this reaction per mole
asked by Priscilla 
math
there are 7 red balloons and 4 fewer blue ballons. use cube trains to model the set of ballons.
asked by nancy 
psychology
Can someone please help me with this psychology question asap? Describe how you might design a community health campaign. In your description, consider both risky behaviors and health promoting behaviors. I really need help with this. Thanks!
asked by Marilyn 
Physical Chemistry
Derive an expression for number of electrons N(E) with energy that can escape from a metal in terms of Z(E) (density of state) and F(E) (Fermidirac function) and ф (work function).
asked by John 
chemistry
calculate the halflife of a first order reaction if the concentration of the reactant is 0.0396 M at 12 seconds after the reaction starts and is 0.00579 M at 47 after the reaction starts. How long does it take for the reactant concentration to decrease
asked by saud 
math
find the solution of (x2y2)dx + 3xydy =0 Please help me to find the right answer,I sovled many ways but I don't get the right one with answer key. Thank you so much in advance
asked by lyn 
My First Quarter Grades (PLEASE READ!!!!)
What is my grades for the first quarter? I didn't get my report card because my parents didn't go to the parents teacher conference so yeah but today my guides counselor show it to me (my grades for the first quarter) they didn't calculated my average.
asked by Laruen 
Physics
#4. Rain is falling at a velocity of 10,0 m/s at an angle of 30* towards the west. At what velocity and direction does a marathon runner have to go in order for him to get rain on his head?
asked by Jim 
math
you have a 20 x 20 area and you have 4 14 foot fences plus 4 4 foot fences and you need to house 9 dogs and none can be together how do you do it?
asked by heidi 
Learning Math
Please solve 9x+x
asked by June 
Spanish
I would just like to know if these sentences are grammatically sound. Esta es la receta para empanadas de pera de Chile. Estos son los ingredientes: Dos tazas de peras secas Dos tazas de agua Tres cuartos tazas de azucar Una cucharilla de canela Una
asked by Mishaka 
Psychology Please Help!!
One of the arguments against inherited racial differences in intelligence is based on data that shows: a. a college education reduces the gap between the IQ scores of white and black races. b. nutrition reduces the gap. c. scores for black test takers
asked by Anonymous 
4th grade
753m when m=8. Thanks!
asked by Dominique 
Learning Math
why is it when 9x+x= 10x are we adding the x? Please help me to understand
asked by June 
MATH
THANK YOU! Brenda and her family were driving to her grandmother’s house during a holiday. During the drive, Brenda fell asleep halfway through the trip. When she awoke, her family still had to travel half the distance that she had traveled while she was
asked by To; Millie 
Science
What are the equivalents of K, 0°C, and 0°F in the other temperature scales?
asked by Shirley 
physics( PLEASE READ)
a bicyclist is finishing his repair of a flat tire when a friend rides by at 3.5 m/s. two seconds later, the bicyclist hops on his bike and accelerates at 2.4 m/s^2 until he catches his friend? (a) how much time does it take until he catches his friend?
asked by taylor 
physic (PLEASE READ)
a model rocket rises with constant accerleration to a height of 3.2 m, at which point its speed is 26.0 m/s. (a) how much time does it take for the rocket to reach this height? (b) what was the magnitude of the rocket's acceration? (c) find the height and
asked by taylor 
physics (PLEASE READ)
referring to the previous problem, if you had entered the same sandy patch with a lower speed, say 7.0 m/s, would the patch have the same effect on your speed, say 7.0 m/s, would the patch have the same effect on your speed? that is, assuming the sandy
asked by taylor 
physics (PLEASE READ)
when a chameleon captures an insect its tingue car extend 16 cm in 0.10 s. (a) Find the magnitude of the tongue's acceleration, assuming it to be constant.(b) In the first 0.050 s, dones the tongue extend 8.0 cm, more than 8.0 cm, or less than 8.0 cm?
asked by taylor 
Science 9
Please help, i really don't understand what this question means, in what s Videos Maps News Gmail More Stephanie Chu order are ions named in an ionic compound: negative ion followed by positive ion or postive followed by negative. Please no links, i
asked by Stephanie 
physics
While fishing, you get bored and start to swing a sinker weight around in a circle below you on a 0.24 m piece of fishing line. The weight makes a complete circle every 0.60 s. What is the angle that the fishing line makes with the vertical?
asked by Danielle 
finding math
find the decimal notation for the fracton 3/10
asked by June 
Free Enterprise
why might it be a plus for a company to have such a high share price that trading in its stock is discouraged?
asked by CP 
Language Arts
I have a big packet of homework can somebdy help me?1,000 qstn. :(
asked by Yessica 
FLUID MECHANICS
An inclined triangular plate is held in water with the base at the surface.Base=4m an height=6m.The inclination of the plate to the horizontal is 60.Find the resultant force and the center of pressure.
asked by michael 
physical science
A 1200kg car reaches a speed of 11 m/s from rest in 10 seconds. Determine the cars power.
asked by Mish 
Math prediction
how to add the following 94+(19)
asked by June 
math
prove these identies sin^2+tan^2=sec^2cos^2 sin^2 sec^2 +sin^2=tan^2+sin^2
asked by melissa 
physics
Resultant force=203.89KN
asked by michaeL 
Math
What the base b1 of an Isosceles trapezoid if b2=57ft,h=17ft6inches and both legs are 23ft? or the formula for the solution?thank you.
asked by Jason 
Alg. II/Trig
If m and n are real numbers, i^2=1, and (mn)4i=7+ni, what is the value of m?
asked by Lily 
world history
What strategy did Buddhist and Christian missionaries employ to spread their faith that Muslims didn't? A. Forceful conversion of others B. Conversion of merchants C. Use of artifacts D. Conversion of kings and other elite figures im 70% sure it's D what
asked by firedup 
economics
# You produce shoes. Currently you produce 4 pairs of shoes at a total cost of %40. a)what is your average total cost (ATC) b)Suppose you could produce one more( fifth)pair at a marginal cost of $20. If you do produce that fifth pair of shoe, what will
asked by gopak 
chemistry
why is NO equal to nitrogen oxide isn't the charge of N ion +3?
asked by anonymous 
math
what is the volume of a rectangular prism with a height of 481 ft and length 756 ft?
asked by Adetola 
math
the ratio of cube to sphere in a geometry box is 16 to 9. If there are 225 cubes and spheres in the geometry box altogether. Then how many cube are there?
asked by dashawn 
Physics
Tom the cat is chasing Jerry the mouse across a table surface 1.9 m off the floor. Jerry steps out of the way at the last second, and Tom slides off the edge of the table at a speed of 4.6 m/s. Where will Tom strike the floor? The ac celeration of gravity
asked by Emma 
world history
What strategy did Buddhist and Christian missionaries employ to spread their faith that Muslims didn't? A. Forceful conversion of others B. Conversion of merchants C. Use of artifacts D. Conversion of kings and other elite figures im 70% sure it's D what
asked by firedup 
RES/342
Suppose you devised a training program to raise student scores on a standardized test, such as ACT, or AIMS (like in Arizona). You first administer the test to a random sample of students, record their scores, administer the training to these students, and
asked by Hamilton 
Learning
9(1)
asked by Rocky 
business
define a supply chain driver and show it's relation to supply chain focus with a couple of examples
asked by Edwin 
economics
How do “rules of the game” affect productivity and growth? What types of “rules” should a government set to encourage growth?
asked by payal 
practical exercise
The Holland Flower Book illustrates
asked by Anonymous 
economics
Explain how output per capita can grow faster than labor productivity. Is it possible for labor productivity to grow faster than output per capita?
asked by payal 
social studies
what are the main assumptions underlying organizational communication?
asked by Edwin 
Math Help
9(1) please help me solve with explanation
asked by Rocky 
Math
Ms. SUE, Is this correct? 4. 5/8 + 5/6 = 1 11/24 5. 13 1/2 + 7 2/3 = 21 1/6
asked by Brad 
Social studies
What were the causes of the French and Indian war?
asked by Lauryn 
laguadia
we are 95% confident that the mean number of weekly hours that u.s. adults use computers at home is between ?
asked by stacy 
English
I am writing an essay on As I Lay Dying by William Faulkner. What are some biblical allusions in the novel?
asked by Morgan 
statistics
can you place 44 coins in 10 containers and have them distributed evenly
asked by charlie 
Science
I said D for the following question but I got it wrong, I know it's not B though because the disease isn't sexlinked and not C because people who get the disease are usually older (50's). Would the Answer be A then? Even though it's deadly the
asked by Jon 
Physics
Two disks are mounted (like a merrygoround) on lowfriction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 2.58 kg·m2 about its central axis, is set spinning
asked by Emily 
american history
In the election of 1860, the _______ won the electoral votes of all the free states, except a fraction of the New Jersey votes. A. Constitutional Union Party B. Republicans C. Democrats D. Whigs
asked by Anonymous 
chemistry
How long would it take for the concentration of the reactant to drop to oneforurth its initial value? initial concentration of reactant=0.64mol/L halflife=30s
asked by saud 
physics help
A 10 g bullet moving at 370 m/s strikes a ballistic pendulum of mass 2kg. The bullet emerges with a speed of 100 m/s. What height does the pendulum rise to? I don't want the answer, i just need hints!!! thnaks
asked by mary 
algerbra
7y=5x, for y
asked by Connie 
college algebra... LOG
log4(little 4) 8 how do i write this in y=?
asked by brianna 
English
I urgently need you to check these sentences. Thank you. 1) As our students we'll probably have to learn science in English in their last year of high school, we would rather they used English as the lingua franca for their Comenius project. 2) I think
asked by Henry2 
financial managemnt
3. CDL Inc. currently has a $10 million bond issue outstanding, which carries a coupon rate of 8.3% paid semiannually, has 4 years remaining until maturity, and is priced to provide for a yield to maturity of 8.16%. The firm’s underwriter has indicated
asked by sheldon 
american history
In 1866, the Sioux Chief Red Cloud ambushed and massacred Union soldiers in an incident that would be referred to as the _______ Massacre. A. Wounded Knee B. Little Big Horn C. Chivrington D. Fetterman
asked by Anonymous 
English
Rewrite the passage below correcting any errors of grammar and usage The mechanic drove out the car to Joe that was lubricated. As a matter of fact, he has not done enough on it as Joe has expected. But whatever it was he decides to take it like that. The
asked by richard 
chemistry
Fe2+ + MnO4 > Fe3+ + Mn2+ Fe2+ = +2 Mn = +7 O4 = 4(2) = 8 Fe3+ = 3+ Mn2+ = 2+ ok so next I gave 8H to MnO4 and 4 H20 to Mn2+ Next I starting adding my electrons. 1e to Fe3+. I understand that. This is where Im lost according to my book I give 5e
asked by Monique 
chemistry
How does the N in NO2 have a oxidation state of 4+ please explain
asked by Monique 
science
Where do subduction zones occur? What happens at them? What becomes of a subducted plate edge?
asked by Shirley 
american history
The WadeDavis Bill passed by Congress, then vetoed by Lincoln, stipulated that _______ percent of voters in a Confederate state must take an oath of future loyalty to the Union before a process of restoration could begin. A. 10 B. 70 C. 20 D. 50 i thinkit
asked by Anonymous 
English
I urgently need you to revise these sentences. 1) Do you intend to start the project before Christmas? 2) I need to know which and how many students you are going to involve. 3) What do you think of our proposal of including 20 students from year 11? 4) I
asked by Henry2 
science
Why are most fossils found in beds that were once the floors of shallow seas?
asked by Shirley 
UNIVERSITY OF EDUCATION,WINNEBA
How would one use the elements of the marketing mix to advise a hairdresser?
asked by DAVID 
amercian history
If you were a reformminded person who, above all, loathed the social problems associated with alcohol, you would have been especially sympathetic to the A. WCTU. B. Mugwumps. C. Comstock Law. D. evangelical efforts of Dwight L. Moody. I think it is a is
asked by Anonymous 
English
I may write this. I need to know if you both agree to include students from years 10/11.
asked by Henry2 
american history
A series of legislative acts passed under the Grant administration in 1870 and 1871 authorized federal protection for black suffrage through the use of the Army against the Ku Klux Klan. Together, these were known as the _______ Acts. A. Reconciliation B.
asked by Anonymous 
algebra
how do you do this problem? perform indicated operation write answer as a fraction, simplify. 1/11+ 5/6
asked by melinda 
physics
4. The physics class is having a tug of war – the men against the women. For a long time the two teams are pulling with equal force and the knot in the centre of the rope isn’t going anywhere. But then one boy sneezes and stops pulling as hard for just
asked by aishah 
RES/342
A political action committee decided to poll its membership to determine if they were in favor of a certain potential law, similar to gun control. The results that came back were 125 in favor of the law, and 120 against. Given that the crew at the center
asked by Hamilton 
math
What is the minimum diameter of a round stock necessary to make a square key 5 inches to each side?
asked by j2j 
chemistry
Balance the following redox reaction occurring in acidic solution. H+ + Cr > H2 + Cr3+ H+ > H2 do I add H+ to this side since H2 = 0? Also what about electrons. Cr > Cr3+ + 3e Hope I make sense
asked by Monique 
Res/342
Suppose you devised a training program to raise student scores on a standardized test, such as ACT, or AIMS (like in Arizona). You first administer the test to a random sample of students, record their scores, administer the training to these students, and
asked by Hamilton 
Literature
Can you please help me understand the poem "I many times thought Peace had come"?
asked by Anonymous 
Math
What is the antisymmetric relations on the set {0,1}?
asked by Eddie 
Chemistry
if the initial concentration of the reactant in the first order reaction A→products is 0.64 mol/L and the halflife is 30 s, calculate the concentration of reactant 120 s after initiation of the reaction
asked by saud 
chemistry
A solution is prepared by dissolving 0.5842g of oxalic acid (H2C2O4) in enough water to make 100.0ml of solution. A 10.00ml aliquot (portion) of this solution is then diluted to a final volume of 250.0ml. What is the final molarity of thus prepared oxalic
asked by NONO 
algebra
1. Find the LCM of (8+7), (6449v^2), and (87v) 2. Find the LCM of 14x^7 and 98x^5 3. Find all numbers for which the rational expression is undefined 5/v9
asked by lisa 
Math
The relation R on {1,2,3,...} where aRb means a/b for reflexive, symmetric, antisymmetric or transitive in the binary family. Also, the relation R on the set of all pepole where aRB means that a is at least as tall as b. Where is the releation R on N where
asked by Adam 
Math
Construct R3, S2 and S º 3, by supposing R and S are relations on {a,b,c,d), where R={(a,b),(a,d),(b,c),(c,c),(d,a)} and S = {(a,c), (b,d)(d,a)}.
asked by Nat 
Math
What are the partitions of {1,2,3,...10}?
asked by Adam 
algebra
1. Jodie biycles 5km/h faster than Predup. In the same time it takes Predup to bicycle 60km, Jodie can bicycle 75km. How fast does each bicyclist travel? 2.The officejet printer can copy Janet's dissertation in 20min. The LaserJet printer can copy the same
asked by lisa 
Math
Suppose R is the relation on N where aRb means that a ends in the same digit in which b ends. Determine whether R is an equivalence relation on N. And, Suppose that R and S are equivalence relations on a set A. Prove that the R ¿ S is also an
asked by Martin 
Math
Use elements in the order given to determine rows and columns of the matrix. R on {1,2,3,4} where aRb means ab
asked by Tony 
MLA format English
. An article accessed through a library data base by May Gottchalk titled Reconsidering Dyslexia. The article was published in the May 24, 2002, issue of Education Matters and you retrieved the article using Wilson Select on November 22, 2003, on the
asked by HM 
Chemistry
An oil whose density is 0.775g/mL was used in a openend manometer to measure the pressure of a gas in a flask, as shown in figure (b). If the height of the oil column is 7.68cm and Pbar = 760.0mmHg. What is the pressure of the gas in the flask in mmHg?
asked by Chris 
Physics
I just want to be sure if my answers make any sense! A kid throws a ball in the air and catches it 5 seconds later a) What is the initial velocity of the ball? No air friction. b) What is the maximum height which the ball has reached above its departure
asked by Tommy 
english
This is a room that has no floor, no walls, no windows, and also no door. what is it?
asked by Tracy 
Genetics
1) For each of the following partial diploids, give the cellular phenotypes for A and B. Explain. A B a. for a negatively regulated gene: F’pR poAB/ pR poAB F’pR poAB/ pR poAB b. for a positively regulated gene: F’pR poAB/ pR poAB
asked by Tommy 
US Gov
The greatest source of presidential power is: a. the power to remove members of Congress from office for violating their oath of office. b. the power of referendum. c. politics and public opinion. d. the threat of a veto. e. the power to make political
asked by Brooke 
econ
12. A monopolist faces a constant marginal cost of $1 per unit. If at the price he is charging, the price elasticity of demand for the monopolist’s output is –0.5, then
asked by jay 
econ
2. Suppose that firms in an industry have the following cost function: C = 100 + 0.25q2, and the industry faces an inverse demand curve of P = 90 – 2Q. a. I f the industry is competitive, find the longrun equilibrium price, quantity, and profit of a
asked by jay 
math
a slide 5.4 meters long makes an angle of 29 degrees with the ground. how far above the ground is the top of the slide?
asked by sundai 
chemistry
To identify a diatomic gas (x2), a researcher carried out the following experiment: She weighed an empty 3.4L bulb, then filled it with the gas at 1.20 atm and 22.0 C and weighed it again. The difference in mass was 4.7g . Identify the gas. Express your
asked by unknown 
mathi just need help getting startedPLEASE!
Let W be the set of all continuous functions from the set of real numbers R to R. For f,g in W define f+g by (f+g)(x)=f(x)+g(x) and (f*g)(x)= f(x)g(x). Verify that W is a commutative ring. Does W have unity? Why or why not?
asked by Mary 
English
I still have a few more doubts. 1) Thank you for being so quick in answering my letter. 2) I wish you all a nice weekend and I look forward to receiving your email. (Can you help me express these two concepts). 3) Could you start a question with "in
asked by Henry2 
physics
A wheel 80.0 cm in diameter accelerates uniformly from 215 rpm to 360 rpm. If in this process a point on the edge of this wheel have traveled 118 m, how long does this process take?
asked by Alex 
physics
When a 19.9 kg wheel with an angular speed of 3.10 rad/s is disconnected from a motor, a 0.124 N · m frictional torque slows the wheel to a stop. If the wheel has radius of 0.71 m, how long will it take for the wheel to come to rest after being
asked by Alex 
Physics
A Ferris wheel with radius 11.0 m rotates at a constant rate, completing one revolution every 33.9 s. Suppose the Ferris wheel begins to decelerate at the rate of 0.227 rad/s2 when a passenger is at the top of the wheel. Find the magnitude and direction
asked by Jacob 
Physics
A ball of mass 5.3 kg and radius 8 cm rolls without slipping horizontally at 4.3 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring if the spring constant k=41100N/m? (Assume the floor is frictionless)
asked by Jacob 
Physics
Find the angle that the vector R = A + B makes with the positive x axis, use counter clockwise as the positive angular direction, between the limits of −180 degrees and +180 degrees. Answer in units of degrees
asked by Shana 
physics
The hero pursues the villain up to the top of a bungee jumping apparatus. The villain appears trapped but to create a diversion she drops a bottle. The hero quickly straps on the bungee cord to his leg and dives straight down to grab the bottle while its
asked by Jack 
physics
A block is released on an inclined plane from a height of 1m. There is friction (static and kinetic =.4) and the mass of the block is 5 kg, the mass of the pulley is 1 kg and it has a radius of 5 cm. The slope of the incline is 30 degrees. Find the
asked by Rachael 
physics
when a chameleon captures an insect its tingue car extend 16 cm in 0.10 s. (a) Find the magnitude of the tongue's acceleration, assuming it to be constant.(b) In the first 0.050 s, dones the tongue extend 8.0 cm, more than 8.0 cm, or less than 8.0 cm?
asked by taylor 
Physicss
A guy playing basketball needs to make the penalty shot for his team to win. Given that the ball is thrown from a height of 2 meters at an angle of 60 degrees, that the post is situated at a distance of 7 m and standing at 3.5 m: a) What does the initial
asked by Brian 
Psychology Please Help!!!!
As Marcia took her place in the classroom on her first day of class, a familiar feeling surged inside of her. She found herself "scoping out the competition," considering topics for the "best in class" paper, and listening for an opportunity to add to
asked by Anonymous 
Math
I have 6 pairs of socks lying unmatched in my dresser drawer. Each pair is a different color(brown, black, red, yellow, green, and purple). When I wake up in the morning, I randomly grab 2 of the loose socks and put them on without looking. If 2 socks are
asked by John 
physics
referring to the previous problem, if you had entered the same sandy patch with a lower speed, say 7.0 m/s, would the patch have the same effect on your speed, say 7.0 m/s, would the patch have the same effect on your speed? that is, assuming the sandy
asked by taylor 
physics
a model rocket rises with constant accerleration to a height of 3.2 m, at which point its speed is 26.0 m/s. (a) how much time does it take for the rocket to reach this height? (b) what was the magnitude of the rocket's acceration? (c) find the height and
asked by taylor 
physics
a bicyclist is finishing his repair of a flat tire when a friend rides by at 3.5 m/s. two seconds later, the bicyclist hops on his bike and accelerates at 2.4 m/s^2 until he catches his friend? (a) how much time does it take until he catches his friend?
asked by taylor 
meadowcreek
a square fishpond has an area of 68 square feet, to the nearest thenth of a foot, what is the length of a side of the fishpond
asked by mishell lopez 
math
please solve 5.68(4)
asked by cree