Questions Asked on
February 24, 2012

Chemistry 101
if 95j of heat is added to a pure gold coin with a mass of 16 grams, what is its temperature change? Specific heat capacity of gold is 0.128 j/g degrees C.
asked by Haley 
physics
. An inquisitive physics student and mountain climber climbs a 50.0m cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of
asked by ai 
statistics
A student scored 84 points on a test where the mean score was 79 and the standard deviation was 4. Find the student's z score, rounded to 2 decimal places
asked by RGCLARK 
statistics
A scatter plot would be useful for A. Showing the relative number of sales of four different brands of blank DVDs B. Showing the trend of sales, over time, of five different brands of blank DVDs C. Showing the relationship between the sales of blank CDs
asked by RGCLARK 
chemistry
Separate this redox reaction into its component halfreactions. O2 + 2Zn >2ZnO
asked by Anonymous 
chemistry
a quantity of gas is collected over water at 15C. The manometer indicated a pressure of 24.0kPa. what would be the pressure of the dry gas?
asked by garrett 
physics
two charged bodies exert a force of 86N on each other. If they are moved so that they are 6 times farther apart, what is the new force that they will exert on each other?
asked by Anonymous 
chemistry
The quantity of antimony in a sample can be determined by an oxidationreduction titration with an oxidizing agent. A 6.35g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the
asked by Anonymous 
3 grade english
singular and plural pronouns direction revise each sentence. replace the underlined words with sigular or plural pronouns. 1 some people thought of a new sport, and the sport became popular. in this sentence the word underline is (the sport) my son write
asked by dw 
chemistry
The reaction: A + 3 B = D + F was studied and the following mechanism was finally determined A + B = C (fast) C + B = D + E (slow) E + B = F (very fast) The step with largest activation energy is a. the first step b. the second step c. the third step d.
asked by bob 
Math
If paul pays the newspaper company 70% of what he collects how much would he keep for himself in a month when he collected $450.00
asked by Yazmin 
chemistry
How many liters of pure oxygen at STP is consumed by a human being in 24 hours if the human body requires daily energy that comes from metabolizing 816 grams of sucrose (C12H22O11)? C12H22O11(s ) + 12 O2(g) => 12 CO2(g)+11 H2O
asked by garrett 
more math needed
You have a 70% dextrose solution. How many grams of dextrose are in 400ml?
asked by Vicki 
chemistry
Separate this redox reaction into its component halfreactions. Cl2 + 2Na > 2NaCl
asked by Anonymous 
math
A pie chart of total number of students in a school has a sector 35degree representing 14students.how many students are there in the school altogether?
asked by Tony 
physics
A person of mass 84.5 kg is initially at rest on the edge of a large stationary platform of mass 150 kg, supported by frictionless wheels on a horizontal surface. The person jumps off the platform, traveling a horizontal distance of 1.00 m while falling a
asked by John 
Healthcare Finance
You are considering starting a walkin clinic. Your financial projections for the first year of operations are as follows: Revenues (10,000 visits) $400,000 Wages and benefits 220,000 Rent 5,000 Depreciation 30,000 Utilities 2,500 Medical Supplies 50,000
asked by anonymouscoward 
chemistry
For a certain chemical reaction, the rate constant at 250.0 °C is 0.00383 s1 and the activation energy is 22.40 kilojoules. Calculate the value of the rate constant at 335.0 °C. a. 0.00513 s1 b. 0.00946 s1 c. 0.00787 s1 d. 0.0224 s1 e. 0.000640 s1
asked by bob 
Math
Kelly plans to put her graduation money into an account and leave it there for 4 years while she goes to college. She receives $750 in graduation money and she puts it into an account that earns 4.25% interest compounded semiannually. How much will be in
asked by Anonymous 
Physics
The force exerted by the wind on the sails of a sailboat is Fsail = 440 N north. The water exerts a force of Fkeel = 160 N east. If the boat (including its crew) has a mass of 250 kg, what are the magnitude and direction of its acceleration?
asked by Gregg 
chemistry
For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is 20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than
asked by bob 
chemistry
is the low solubility of KHT a result of an unfavorable delta H or an unfavorable delta S value
asked by Anonymous 
chemistry
Al(NO3)3 + NH3 > ?
asked by Jimmy 
Physics
What is the total charge of all the electrons in a 13 kg bar of silver? (Silver has 47 electrons per atom and an atomic mass of 108 u.)
asked by Millie 
chemistry
For a particular chemical reaction, the rate constant at 30.0 °C is 1.38 X 104 L mol1 s1, while the value at 49.0 °C is 1.21 X 103 L mol1 s1 . What is the activation energy for this reaction? a. 92.8 kJ b. 200 kJ c. 40.4 kJ d. 343 kJ e. 56.4 kJ ln
asked by bob 
chemistry
calculate the freezing point of 12.0g FeCl3 in 142g water...
asked by globamabob 
PHYSICS
You ride your bike along a straight line from your house to a store 1030 m away. On your way back, you stop at a friend's house which is halfway between your house and the store. a) What is your displacement? b) What is the total distance traveled? c)
asked by MARÝA 
Physics
If the angle decreases what will happen to the tension? Please explain why.
asked by Anonymous 
Math
Match each ratio in the first row with an equivalent ratio from the second row if angle A plus angle B = 90 degrees. SinA CosA TanA CscA SecA CotA SinB CosB TanB CscB SecB CotB Pleaseeee help!!
asked by krista 
Chemistry
The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I  = H2O + IO  (slow) H2O2 + IO  = H2O + O2 + I  (fast) Which
asked by Mohamed 
physics
What are the factors that affect the quantity of heat needed to raise the temperature of a substance?
asked by jaquie 
math
the straight L has gradient 3 and passes through the point A(6,4). a) find an equation for L in the form y=mx+c b) straight line R has the equation in the form of 7y+x+14=0. Given that R crosses the yaxis at the point B and intersects L at the point C,
asked by aminath 
Physics
A point charge (m = 1.0 g) at the end of an insulating string of length L = 51 cm (Fig. 1666) is observed to be in equilibrium in a uniform horizontal electric field of E = 9200 N/C, when the pendulum's position is as shown in Fig. 1666, with the charge
asked by Millie 
chemistry
The decomposition of hydrogen peroxide in solution and in the presence of iodide ion was studied in laboratory, and the following mechanism proposed based on the experimental data. H2O2 + I  = H2O + IO  (slow) H2O2 + IO  = H2O + O2 + I  (fast) Which
asked by bob 
math
how do you format hours/daypercentage of time spent during an 8 hour work day ?
asked by Tiffany 
chemistry
The equation A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a. rate = k(A]2 b. rate = k(B]2 c. rate = k(A][B] d. rate = k(A][B]2 e. none of the above represents the rate law for this
asked by bob 
chemistry
The quantity of antimony in an ore can be determined by an oxidationreduction titration with an oxidizing agent. The ore is dissolved in hot, concentrated acid and passed over a reducing agent so that all the antimony is in the form Sb3 (aq). The Sb3 (aq)
asked by Katie 
Math
A man walks one mile east, then he walks one mile northeast and then he walks one mile east. How far is he from his initial position?
asked by Bailee 
Physics
Calculate the resistance per unit length of a nichrome wire, which has a radius of 0.436 mm. The resistivity of nichrome is 1.5×10−6 Ω·m. Answer in units of Ω/m If a potential difference of 20 V is maintained across a 3.7 m length of the nichrome
asked by Kudo 
Chemistry
How many grams of carbon dioxide are produced in C3H8+5O2 > 3CO2+4H2O
asked by Lily 
chemistry
A particular reaction has an activation energy of 51.6 kJ/molrxn. How much faster is the reaction at 50 degrees C versus 25 degrees C? a. 2 times b. 5 times c. 3 times d. half as fast d. 20% as fast help
asked by bob 
Chemistry(Please check)
1) The reaction: A + 3B = D + F was studied and the following mechanism was finally determined A+B=C (fast) C+B=D+E (slow) E+B=F (very fast) Which step has the largest activation energy? I chose the second step because it is slow and should have the most
asked by Hannah 
Chemistry
Balance the redox equation by oxidation number method: Cr2O7 2 + Br + H+ = Cr 3+ + Br + H2O Please help!
asked by Sarah 
English 3
Why are stories and poems about the "realms of darkness" so popular with many readers? Thanks MC
asked by mysterychicken 
physics
A horizontal wire of length 0.78 m, carrying a current of 6.8 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 20°, it experiences a magnetic
asked by Anonymous 
ethics
This is the question i was asked, "The things that will destroy us are: politics without principle; pleasure without conscience; wealth without work; knowledge without character; business without morality; science without humanity; and worship without
asked by leanne 
Calc 1
A farmer with 700 ft of fencing wants to enclose a rectangular area and then divide it into four pens with fencing parallel to one side of the rectangle. What is the largest possible total area of the four pens?
asked by Grant 
Physics  grade 11
The speed of light of a plastic is 1.4x10^8. What is the index of refraction in the plastic?
asked by crystal 
chemistry
In a particular redox reaction, Cr is oxidized to CrO42– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Phases are optional. Cr + Cu2+ = CrO42 + Cu+
asked by Anonymous 
Bussiness
The market for carrots is comprised of two segments: fresh market carrots, which have excellent, uniform color and a small core, and processing carrots, which are larger than fresh market carrots but still have good flavor, color, and sweetness. Annual
asked by Ricky 
Chemistry
A + 2 B = C + D describes an elementary reaction, which takes place in a single step. Thus, the rate law must be a) rate = k (A)^2 b) rate = k (B)^2 c) rate = k (A) (B) d) rate = k (A) (B)^2 I think its D because there are 2 moles of B and 1 mole of A. Do
asked by Mohamed 
physics
The acceleration of a particle moving only on a horizontal plane is given by a= 3ti +4tj, where a is in meters per secondsquared and t is in seconds. At t = 0s, the position vector r= (20.0 m)i + (40.0 m)j locates the particle, which then has the velocity
asked by amy 
calculus
Xy+3=x?x^3
asked by Anonymous 
physics
The acceleration of a particle moving only on a horizontal plane is given by a= 3ti +4tj, where a is in meters per secondsquared and t is in seconds. At t = 0s, the position vector r= (20.0 m)i + (40.0 m)j locates the particle, which then has the velocity
asked by amy 
US HIstory
In what ways was dulles's policy of brinkmanship different from truman's cold war policies? Thanks
asked by Sarah 
physics
A 90 cm length of steel wire with a diameter of 0.5 mm is stretched between the inside walls of an oven the wire is just taut with no tension when the temperature in the oven is 250 °C. What is the the tension force in the wire when the oven cools to a
asked by sand 
math
after passing therough a material t centimeters thick, the intensity I(t) of a light beam is given by I(t) =(4^ct)Io, where Io is the initial intensity and c is a constant called the absorption factor. Ocean water absorbs light with an absorption factor
asked by Suzie 
physics
The temperature in a room is kept at a constant 20 °C but the humidity is only 20%. If the room has a volume of 30m³, and the room’s door and windows closed, how many kilograms of water must be put into the vaporizer to increase the humidity from 20%
asked by sand 
science
A 70 liter tank containing an ideal gas at a pressure of 40 atmospheres is connected by a valve to a 30 liter tank of an ideal gas at 70 atmospheres. The valve is opened slowly and the gases in two tanks mix. Assuming the temperature throughout is
asked by Stephanie 
science
A piston pump containing 2 liters of nitrogen gas at 3000 psia (absolute) pressure empties its entire contents into a 10 liter pressure container. Before the transfer of gas the 10 liter container already contained nitrogen gas at 100 psia (absolute)
asked by Stephanie 
RecheckEssay
By studying in the USA, I believe that I am not only getting an internationally recognized education, but also a thrifty one. My decision to study here will help me become independent. In addition, the money I save by studying here will eventually help me
asked by Hero 
Psychiatry
Application of psycology in developing country
asked by Bayush 
Stem
What controls move robotic arm?
asked by Dj John 
math
The 5th grade marching band includes boys & girls. There are 28 boys in a marching band. The boys are 7/10 of the students in the marching band. What fraction of students in the marching band girls? What is the total number of students in the marching
asked by nina 
physics
If the mass of an object was 0.500 kg and it started from rest, then the object's final velocity at the end of 0.86 seconds is ?
asked by sarah 
Calculus
Evaluate the limit: lim ((7x)^2)9 / 4x x>4
asked by Labiba 
statistics
If the means for our groups on calories consumed a day were Group A = 2000, Group B = 2500, and Group C = 3000 could we just assume that all of the groups had statistically different means? How could we determine which groups were significantly different
asked by pat 
english 3
11. Which one of the following statements is not true about the president Ratcliffe portrayed in The General History? He wasn't very popular. His judgment was weak in times of peril. He voluntarily turned over leadership to John Smith. He was greedy and
asked by helpp 
chemistry
Calculate the number of moles in each of the following: 0.150 g of salicylic acid 0.30 mL of acetic anhydride (density = 1.08 g/mL)
asked by Pat 
Chemistry
This is probably easier then my making it but... Calculate the ph of a forming acid solution that contains 1.35% forming acid by mass. Assume a density of 1.01g/ml for the solution.
asked by L.Bianchessi 
Chemistry
What is the [H3O] concentration in a 1.0M CH3COONa solution? (The Ka for CH3COONa is 2.0*105.)
asked by Brianna 
math
find x such that (x,7) is 10 units from (4,1)
asked by shain 
Physics
Any assistance explaining how to work this would be great! The force exerted by the wind on the sails of a sailboat is Fsail = 480 N north. The water exerts a force of Fkeel = 240 N east. If the boat (including its crew) has a mass of 350 kg, what are the
asked by Student 
math
Nick is writing the 4 letters in his name in different orders. In how many orders can he put the letters?
asked by unknown 
math
Keith, Annie, Elizabeth, and Marcus are taking a picture. How many different ways can the friends stand in a horizontal line?
asked by unknown 
US Government
What should be the goals of the US government today? I have to write an essay with this very question but I need help to formulate at least 4 different topics that the US Government should focus on.
asked by Sam 
chemistry
Explain how you would prepare a saturated aqueous solution of table sugar. Heat the solution to near its boiling point. With stirring, add table sugar to water. Keep adding sugar until no more dissolves. Allow the solution to cool. With stirring, add table
asked by krystal 
Biology
Is nail sulcus and nail fold the same thing?
asked by Lil 
math
A box holds 2 blue marbles and 6 red marbles. How many and what color marbles could you remove from the bag to make the probability of picking red 1/2?
asked by unknown 
math
what is the process for solving the following question? John is 72 inches tall and casts a 40 inch shadow. A monument casts a 24 foot shadow. How tall is the monument?
asked by n 
Orgo
What volume of 1.20 M nitric acid is needed to convert 5.5g of mchlorophenol to 3chloro2,6dinitrophenol? I So far I have converted the 5.5g chlorophenol to mols and I got .043 mol. I know Volume * Molarity (1.2M)=moles. At this point I am stuck.
asked by Sam 
books
In "Touching Spirit Bear," the book, I have to answer these questions. 1. Why does Cole think the bear attacked him? 2. In what way has Cole's mother changed? 3. What happened to Cole's dad when he was a child? 4. Who is the surprise visitor to Circle
asked by Alexis Herda 
Chemistry
I need to convert these 5 values of time into minutes. 1)1.07 1min 7 seconds 2) 6.00 3) 5.02 4) 1.32 5) 25.5 seconds The example that was given for conversion was 5 min 40 sec = 5.67min These are the values that I got after dividing by 60. 1) 1.07 =
asked by Hannah 
college algebra
Given f(x)= 3x^2+x30 and g(x)=x3 find f(x)g(x)
asked by melissa 
physics
A 5.0 {\rm nC} point charge sits at x = 0. At the same time, a 3100 {\rm N/C} uniform electric field (created by distant source charges) points in the positive xdirection.
asked by Anonymous 
social studies
From the point of view of an environmentalist, which is probably the most significant argument against offshore drilling for oil?
asked by Anonymous 
college algebra
Given f(x)=sqrt x+4 and g(x)= 1/x find (fog)(x)
asked by Missy 
Physics
A bowling ball weighing 67.0 N initially moves at a speed of 4.80 m/s. How long must a force of 54.5 N be applied to the ball to stop it?
asked by Anonymous 
physics
Two forces are applied to a car in an effort to move it, as shown in the following figure, where F1 = 416 N and F2 = 363 N. (Assume up and to the right as positive directions.)
asked by Anonymous 
calculus
A 29ft chain with mass density 3 lb/ft is initially coiled on the ground. How much work is performed in lifting the chain so that it is fully extended (and one end touches the ground).
asked by Sara 
Physics
A rubber ball of mass 41.5 g is dropped from a height of 1.75 m onto a floor. The velocity of the ball is reversed by the collision with the floor, and the ball rebounds to a height of 1.55 m. What impulse was applied to the ball during the collision?
asked by Anonymous 
Calculus
find f'(x) if f(x)= (cosx)^sinx
asked by Jesse Stone 
Calculus
find f'(x) if f(x)=x^2*e^x*(3x1)^3
asked by Johnathan 
chemistry
A catalyst alters the rate of a reaction by a. changing the products in the reaction. b. increasing the activation for the reaction. c. always providing a surface on which the molecules react. d. providing an alternate pathway for the reaction. e.
asked by bob 
math
how many feet in a dozen
asked by sami 
chemistry
If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given
asked by bob 
Chemistry
I had to perform an experiment for rate of reaction. I have to calculate the concentration of Na2S2O3 in the reaction solutions based on the volume used in each reaction flask and the total volume calculated. There were five flasks used and for all 5 of
asked by Hannah 
History
Is there any "European bias or bias" in this article? To obtain the necessaries of life, they (he Indians of Arcadia) endure cold and hunger in an extraordianry manner. During eight or ten days, if the necessity is imposed on them, they will follow the
asked by Cara 
Calculus
I could really use the help on this as soon as possible. what is the slope of the line tangent to the curve (/x)^2 at point (4,16)
asked by Jesse Stone 
math
Solve variation problem if m varies jointly as z and p, and m=10 when z=2 and p=7.5, find m when z=5 and p=7
asked by Anne 
Business
" performance can't be measured , so any effort to link pay with performance is a fantasy. Difeerence in performances are often caused by the system, which means the organization ends up rewarding the circumstances. It's the same thing as rewarding the
asked by Stephanie 
physics
Find the acceleration of the block of mass M = 4.79 kg (m = 4.03) (KE = 0.1)
asked by John 
Business
Regarding the question I posted about performance if you agree or don't agree why?
asked by Stephanie 
physics
Find the gravitational force exerted by a 0.515 kg mass on a 0.108 kg mass 1.94 m away.
asked by John 
Business
Describe five different bases (other than productivity) by which organizations can compensate employees. Based on your knowledge and experience, do you think productivity is the basis most used in practice?
asked by Giggles 
plz help math
solve variation problem. if y varies directly as x and inversely as m^2 and r^2 and y=5/3 when x=1, m=2 and r=3, find y when x=3, m=1 and r=8
asked by Anonymous 
music read
After completing your study reading, it is vital that you complete which of the following steps?
asked by Anonymous 
Embedded Software
How would you write a linux program to read data from a joystick, and turn that data into a command that is pushed onto the queue?
asked by Adhi 
algebra
solve by the substitution method. 6x+3y=21 4x+y=41
asked by kim 
math
a perso increases the number of tosses of a fair coin the actual number of heads will get farther and farther away from the number of tosses divided by 2
asked by marie 
PHYSÝCS
At the end of the spring term, a high school physics class celebrates by shooting a bundle of exam papers into the town landfill with a homemade catapult. They aim for a point that is 31.1 m away and at the same height from which the catapult releases the
asked by MARÝA 
PHYSÝCS
You are walking on a moving walkway in the airport. The length of the walkway is 40.1 m. If your velocity relative to the walkway is 2.41 m/s, and the walkway moves with a velocity of 1.59 m/s, how long will it take you to reach the other end of the
asked by MARÝA 
PHYSÝCS
The position of a particle moving along the xaxis is given by x = 3.49t2 – 2.21t3, where x is in meters and t is in seconds. What is the position of the particle when it achieves its maximum speed in the positive xdirection?
asked by MARÝA 
Math
x+y=5 xy=3 Please help me solve this system of equation and show your work thanks
asked by Kim 
PHYSICSelectricity & magnetism
An electric field exits inside a fluorescent tube of diameter 3.00cm. In one second, 2.00x10^18 electrons and 0.50x10^18 positive ions pass through a certain cross section. What is the current in the tube?
asked by Brandon 
criminal procedure
In which areas of search and seizure do you feel that the courts have not gone far enough? In which areas of search and seizures do you feel that the courts have not gone far enough? suport your position. Use actual court cases to support position.
asked by marie 
chemistry
Al(NO3)3 + NH3 > ?
asked by Lucas 
american history
I nee help revising my essay here it is This is what my general view on American History. Well let me tell you it’s a course that we all have to take in high school to graduate. In school we are confronted with American History, state History and general
asked by connie 
Biology
Denny, who is allergic to wool, accidentally wears a scarf that is 50% wool. one hour later, after removing the scarf, she finds that the skin around her neck is red and swollen. Explain what has happened to her. (Our unit is Blood and immunity)
asked by Soar 
psychology
NREM sleep is characterized by
asked by Anonymous 
physics
An American standard analog television picture (nonHDTV), also known as NTSC, is composed of approximately 485 horizontal lines of varying light intensity. Assume your ability to resolve the lines is limited only by the Rayleigh criterion, the pupils of
asked by mina 
Java
create a java program that accepts students names, and test scores from a file, and displays theri name, average score and letter grade to the screen.
asked by Big Daddy 
Statistics
For sample mean x = 150, sample size n = 36 and sample standard deviation s = 40 find 80% confidence interval for population mean. Population standard deviation is not known
asked by Tina 
physics
an 84 kg fisherman jumps for a dock into a 122 kg rowboat at rest on the westside on the dock. if the velocity of the fishermen is 4.8 m/s to the west as he leaves the dock what is the final velocity of the fishermen and the boat?
asked by Anonymous 
English
Writeacher, I need to write phrasal verbs related to work. I wonder if you could help me. I wanted to include them in a story but some phrasal verbs are more used in dialogues. 1) My mum works as a secretary for the personnel manager in the Ferrero firm.
asked by Henry2 
Chemistry
An aqueous sugar solution is formed by adding 50.1 g sucrose (C12H22O11) to 200.0 g water. What is the boiling point (in Celsius) of this sugar solution (this is NOT the ΔTb). Kb H2O = 0.51 Celsius/m
asked by amy 
Chemistry
An aqueous salt solution is formed by adding 11.67 g sodium sulfate (solute) to water (solvent). What mass (in g) of water is used if the freezing point of the solution is 12.9 Farenheit. Kf H2O = 1.86 Celsius/m
asked by jenny 
algebra
(48x^6)/(48x^6/12x^212y^2)/(4x^5)/(3xy+3y^2)
asked by Sasha 
chemistry
Cocaine is a nonelectrolyte that has a molecular weight of 303.4 g/mole. How many grams must be dissolved in 25.0 mL of Chloroform (density = 1.484 g/mL) to raise its boiling point to 65.5 Celsius? The boiling point of pure Chloroform is 61.2 Celsius. Kb
asked by anna 
Chemistry Help PLEASE!!
I don't know how to do this question, I understand we have to use ICE but I keep getting the wrong answer when I solve for x, it's just not working for me. Consider the following reaction: A(g) > 2B (g) Find the equilibrium partial pressures of A and B
asked by Student 
social studies
A study of the causes of the American Revolution of 1776, the French Revolution of 1789, and the Russian Revolution of 1917 best supports the generalization that revolution is most likely to occur when?
asked by Anonymous 
probability problem
A box contains 6 green, 8 red, 5 yellow, and 10 blue marbles. Four marbles are drawn from the box at the same time. a) What is the probability that all four marbles are the same color? b) What is the probability that none of the marbles is blue? c) What is
asked by Sam 
Chemistry(Please check)
1) A catalyst alters the rate of a reaction by a. changing the products in the reaction. b. increasing the activation for the reaction. c. always providing a surface on which the molecules react. d. providing an alternate pathway for the reaction. e.
asked by Hannah 
CHEM
How does the neutron to proton ratio affect the stability of an atomic nucleus ?
asked by NILA 
math
The surface area of any shape is expressed in:
asked by isaac 
math
What is the surface area of a circle that has a diameter of 14 inches?
asked by isaac 
math
What is the surface area of a circle that has a diameter of 14 inches?
asked by isaac 
computer
To all computer programmer or people know or use computer programming. what tags can we use to connect the comment of the web page to your email. thanks to all of you to help me...
asked by shiela 
math
Write expression for the other five trigonometric ratios for each acute angle: A) cscƒÆ=a/b B) secƒÀ= x+1/x1, x‚1
asked by Christine 
Calculus
The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a) determine the legal speed that will maximize the fuel efficiency using speed limit of 50 km/h
asked by Jake 
Calculus
what is the slope of the line tangent to the curve (/x)^2 at point (4,16) * (/x)= the squareroot of x
asked by Jesse Stone 
math
int( absolute(x1) + sqrt(9x) ) Hint: you may interpret the integral as an area.
asked by Calculas 
speech
I am looking for an attention getter for my imformative speech about doghuman communication, In the speech, I am going to be talking about verbal and non verbal dog behaviors and then how dogs repond to human verbal and non verbal behaviors. I was
asked by rebekah 
statistics research
What proportion of adults use between 15 and 23 gallons of gas per week if it is normally distributed with a mean of 16 gallons and a standard deviation of 5 gallons?
asked by Lauren 
physics
A 1.50 103kg car starts from rest and accelerates uniformly to 18.5 m/s in 11.3 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. 1 W (b) Find the instantaneous power output of
asked by Mark 
physics please help
one kilwatt/hour (kWh) is the amount of work or energy generated when one kilowatt of power is supplied fr a time of one hour. a kilowatt/hour is the unit of energy used by power companies when figuring your electric bill. determine the number of joules of
asked by taylor 
Statistics
How do you find the proportion bewtween two numbers, for example, proportion of people drink between 18 and 26 gallons of water per week?
asked by Laurena 
math
If you need 240 oz of paint to cover 1200 in. How much paint do you need to cover 2000 in.?
asked by Lindsey 
AP US History (Help Required ASAP)
Explain the rise of the republicans and the international challenges faced following world war I?
asked by Amy 
chemistry
A quantity of gas has a volume of 121 L when confined under a pressure of 2.50 atm at a temperature of 20.0 C. At what pressure will its volume be 30.0 L at 25.0 C?
asked by garrett 
chemistry
what volume does 2.5 moles of carbon monoxide occupy at 50.5 kPa pressure and 20.0 C?
asked by garrett 
physics please help
the floors in a typical house are separated by a vertical distance of approximately 8.0 ft. a teenager (1.0x 10^2 lb) climbs the stairs between floors at a steady speed. find the power necessary to accomplish this if the stairs are climbed in (a) 10.0 s
asked by taylor 
Math
Solve triangle ABC if b = 10, c = 9.1, and C = 53.6 degrees. How many solutions are there? First Solution:What are angle A and B and Side a. Second Solution: What are angle A and B and Side a. Thanks!
asked by Rosetano 
american history
Ineed help revising my assignment
asked by connie 
Geology
Is the distribution of geologic activity clumped, random, uniform, or some other pattern? Explain\ Is the distribution of geologic activity clumped, random, uniform, or some other pattern? Explain
asked by steph 
Algebra 2
My question involves "Graphic Representation of Radicals of the Second Order" I know that the length of the hypotneuse of a right triangle equals the square root of the sum of the lengths of the two legs. The problems I'm having trouble with are the square
asked by Josh S 
Math
john earns $10 per hour and made a total $825. How many hours did he work during this period? Write an equation to represent this situation.
asked by Brianna 
BA
use scientific notation to divide the two numbers, express answer using scientific notation, retain at least 3 decimal place for (8.4.10^6)/(5.97.10^2)
asked by Dechols 
Physics
The boiling point of helium at 1 atm is 4.2 K. What is the volume occupied by helium gas due to evaporation of 70 g of liquid helium at 1 atm pressure and a temperature of 6.2 K?
asked by Gabe 
math
what is 9+9d=8d12
asked by taylor 
Probability
Suppose that an unfair coin comes up heads 54.1% of the time. The coin is flipped a total of 13 times. a) What is the probability that you get exactly 6 heads? b) What is the probability that you get exactly 6 tails? c) What is the probability that you get
asked by Vikki 
Biology
Some questions fall outside of the realm of science;which of the following questions could not be ansewered usingf the scientifec method
asked by Anonymous 
physics
A car starting from rest accelerates uniformly are attaing a speed of 80m/s in 30s it maintains this stedy speed for another 30s. It then slow down uniformly until it comes to rest in the next 40s
asked by adeyemi 
chemistry
weight of watch glass+funnel= 121.573g weight of watch glass+funnel+CaC2O4H2O=122.044 g how many moles of CaC2O4H2O were isolated during the experiment? related equations: HO2CCO2H + OH > O2CCO2 + H2O Ca2+ + O2CCO2 + H2O >CaC2O4*H2O
asked by anna 
physics
A 2.80 kg steel ball strikes a massive wall at 12.8 m/s at an angle of alpha = 50.9° with the plane of the wall. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.156 s, what is the magnitude of the average force
asked by Tom 
chemistry
How many moles of sodium hydroxide are produced when 0.155 mole of sodium reacts with excess water?
asked by Cris 
math
lisa made a longdistance telephone call to her friend Jane. the cost was $.42 for the fist minute and $.19 for each additional minute. what was the total length of the call if it cost $2.89
asked by NELLIE 
math
The building is 16 by 12 feet so, to the nearest tenth of a foot what distance (x) fom the building should time place the 16ft ladder so that the top of the ladder will be 12 feet above the ground?
asked by Nicole 
math
antonio wants to buy a car that costs $2,500. he plans to put $400 down and pay the rest in six equal payments. find the amount of each payment
asked by PATRICE 
chemistryhelp
what does the electrolyte in batteries do?
asked by joe 
physics
A 16.3 kg block is dragged over a rough, horizontal surface by a constant force of 157 N acting at an angle of 35 degree above the horizontal. Find the work done by the 157 N force.
asked by Anonymous 
Chemistry
A 300.0g sample of ice at 30.OC is mixed with 300.0G of water at 90C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capazities of H2O(s) and H20(L) are 2.03 and 4.18 j/g*C respectivly, and the entahply
asked by Keru 
physics
A rubber ball of mass 19.5 g is dropped from a height of 1.85 m onto a floor. The velocity of the ball is reversed by the collision with the floor, and the ball rebounds to a height of 1.55 m. What impulse was applied to the ball during the collision?
asked by Tyler 
physics
A bowling ball weighing 43.0 N initially moves at a speed of 4.90 m/s. How long must a force of 51.0 N be applied to the ball to stop it?
asked by John 
math
. In the annual walkathon, Lee jogs for 5 3/4 miles more than he walks. If he travelled a total of 15 miles, how many miles did he walk?
asked by shelby 
algebra 1
(w^357w+43) / (w+8)
asked by amanda 
physics
A skater of mass 74.0 kg initially moves in a straight line at a speed of 4.60 m/s. The skater approaches a child of mass 45.0 kg, whom he lifts on his shoulders. Assuming there are no external horizontal forces, what is the skater's final velocity?
asked by John 
Math
This question is from my workbook (PreCalculus 11). Can someone please help me understand it? Suppose theta is an angle in standard position with terminal army in quadrant III and tan theta = 6/3. Determine the exact calues of the other two primary
asked by David 
Math
y=5x2 6x+3y=15 Please help me solve this system of equation and show your work thanks
asked by Haylie 
TRIG/ALGEBRA
1) Find the exact value. Use a sum or difference identity. tan (15 degrees) 2) Rewrite the following expression as a trigonometric function of a single angle measure. cos 3x cos 4x  sin 3x sine 4x
asked by cheyanne 
law
• What is the role of police in society? What would happen if the role of the police were lessened as it applies to the theory and practice of community policing?
asked by dan 
World History
Around 700 B.C.,Athernians became unhappy with their form of government. What new type of government replaced it? A.aristocracy B.democracy C.oligarchy D.monarchy My answer is D ?
asked by ciara 
Physics  Newtons laws
A block (mass m1 = 8kg) is moving on an inclined plane, coefficient of kinetic friction of 0.45, whose angle is 30degrees. This block is connected to a second block (mass m2 = 22kg) by a cord that passes over a small frictionless pulley. Find the
asked by Anonymous 
Physics
What is energy
asked by Vivek 
computer science
my code works in c++ so the logical I am getting error must be in the reading of the problem, but I can't see it: Given a type Money that is a structured type with two int fields, dollars and cents. Assume that an array named monthlySales with 12 elements,
asked by Cheryl 
algebra
How much water should be added to 20oz of a 15% solution of alcohol to dilute it to s 10% alcohol solution?
asked by rhonda