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September 30, 2014

Posts by bob


Total # Posts: 2,411

6th grade Math
I don't get this question, can someone please explain it, thanks. Heres the question: A lighthouse beacon can be seen 24 mi in all directions. What is the area over which the beacon can be seen? - I think it's circumfrence, but I don't really know what to do. ...
March 2, 2009

physics
A flight attendent pulls her 78.6 N flight bag a distance of 344 m along a level airport floor at a constant velocity. The force she exerts is 44.8 N at an angle of 64.2 degrees above the horizontal. Find the coefficient of kinetic friction between the flight bag and the floor...
March 1, 2009

math ws
Hey
March 1, 2009

Chemistry: Molarity
4.82 mL of a 0.262 M NaOH solution reacts completly with 4.79 mL of HCl solution according to the balanced chemical reaction shown below: HCl (aq) + NaOH (aq) -> NaCl*aq) + H2O (I) What is the molarity of the HCl solution? 4.82 x (1L/1000 mL) = .00482L 4.79 x (1L/1000 mL...
March 1, 2009

Chemistry
Alright, I see my error. I appreciate the help :)
February 28, 2009

Chemistry
Aren't you looking for the molarity in this equation. If so, the molarity equation is M = moles of solute / Liters of Solution
February 28, 2009

Chemistry
Use the dilution relationship (Mi x Vi = Mf x Vf) to calculate the volume of 0.500 M NaOH needed to prepare 500 mL of .250 M NaOH. This is my work ? L Solution = 500mL x (1L/1000mL) = .500L ? mol NaOH = .500 L Solution x (0.250 M NaOH/1 L Solution) = .125 mol NaOH ? L solution...
February 28, 2009

3rd grade math
the greens family they had 8 people plus 2 they r going to disenyland they have $3.40 and each person cost 38 cents will they hav enough money to go to thier destionation please explain
February 27, 2009

physics
A mass of .50 kg attached to a vertical spring stretches the spring 37 cm from its original position. The accel of gravity is 9.81 m/s2. What is the spring constant?? Answer in units of N/m
February 25, 2009

biology
a fatty acids is most closely associated with what?
February 25, 2009

6th grade Social Studies
Thanks.
February 24, 2009

6th grade Social Studies
Well, This is my box's [ ] [O] [ ] [ ] [S] [ ] I don't think its frozen. ~Thanks
February 24, 2009

6th grade Social Studies
Crossword- 3 DOWN The most common type of land in Russia. 6 (Six) boxs.
February 24, 2009

Physics
You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.15 m. a) determine frequency of these water waves in units of Hz?? b) determine the period of these water waves in units of s. ?? c) determine the speed of these ...
February 24, 2009

Physics
When these two spheres come in contact, the stronger forces of repulsion on the second sphere will move two electrons onto the first sphere. When this occurs, the electrical forces will be in balance and there will be no further net movement of electrons.
February 24, 2009

Chemistry
What is the theoretical yield of calcium carbonate if 2.97 grams of calcium chloride dihydrate reacts with excess sodium carbonate according to the balanced chemical reaction shown below? CaCl2•2H20(aq)+Na2CO3(aq)->CaCO3(aq)+2NaCL(aq)+2H20(I) Please use molar mass ...
February 23, 2009

Chemistry
I apologize about the length of the message. This will be the last long one I post. To figure out the molar mass of CaCl2•H2O (rounding to the hundredths place), I did Ca = 40.08 Cl2 = (35.45) x 2 = 70.9 2H2O = (18.02) x 2 = 36.04 40.08 + 70.90 + 36.04 = 147.02 g/mol 2....
February 22, 2009

Chemistry
Hi, I have a few questions that I am struggling with. Any help would be greatly appreciated. Question 1 Calculate the molar mass of calcium chloride dihydrate, CaCl2 • 2H2O. Please use the Periodic Table values rounded to the hundredths place for your calculation and ...
February 22, 2009

SAT Essay
off topic. its not about failure its about expectations
February 18, 2009

math
First rearrange the equation into Y=mx+b form. where m represents the slope & y represents the Y intercept. The X & Y represent the two coordinates that you are solving for. When you rearrange it into y=mx+b form then the equation should read y=3x-5. 3 is your slope and -5 is ...
February 17, 2009

Math
francois is stokcing a new fish pond on his farm. The pond is filling slowly and the volume of water in it can support a certain number of fish,(variable-F). F=42m+250, where m is the number of months the pond has been filling. the pond was stocked initially with 110 fish, a ...
February 17, 2009

math
u first have to rearrange this equation so it is in y=mx+b form after u do that u first graph the y-intercept then depending on ur slope u grpah it if u slope is 2 that basically means 2 over 1. the rise is 2 and run 1. so u go up 2 from ur y-intercept and 1 right and u ...
February 17, 2009

physics
a 1600-kg vehicle moves with a velocity of 19.5 m/s. calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s
February 16, 2009

Microeconomics
1. A country's consumption possibilities frontier can be outside its production possibilities frontier if a. the country engages in trade. b. the citizens of the country have a greater desire to consume goods and services than do the citizens of other countries. c. the ...
February 13, 2009

Microeconomics
1. A country's consumption possibilities frontier can be outside its production possibilities frontier if a. the country engages in trade. b. the citizens of the country have a greater desire to consume goods and services than do the citizens of other countries. c. the ...
February 13, 2009

sociology perspective
do your own homework
February 12, 2009

Physics
An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of % I got 36.5% but the teacher is saying that's wrong!! Please help with calculation.
February 11, 2009

math
g(13)= 3(13)-2 =39-2 =37
February 10, 2009

physics
I used the theorem and got a answer of 37% but I don't think its right??
February 10, 2009

physics
An engine has a hot reservoir of 520K and a low temperature reservoir of 330K. What is the theoretical efficiency of this engine? Answer in units of %
February 10, 2009

math
1,000,000+245-4564+3984068568+45-21x75.5675x500,000 :]
February 10, 2009

calculus
Find a formula for the inverse of the function f(x) = (4 x-1)/(2x+3)
February 10, 2009

calculus
Find an equation of the tangent line to the following curve at the point (0, 4). xe^y+ye^x=4
February 10, 2009

physics
a 2390 kg car traveling to the west at 22.4 m/s slows down uniformly under a force of 8740 N to the east. (a) How much force would be required to cause the same acceleration on a car of mass 3140 kg? Answer in units N (b) How far would the car move before stopping? Answer in ...
February 9, 2009

Physics
A weight suspended from a spring is seen to bob up and down over a distance of 37 cm twice each second. What is frequency in units of Hz? What is the period in units of s.? What is the amplitude in units of cm?
February 9, 2009

U.S.History
in reference to your question about the Puritans. I believe the answer is B. The puritans came to America to set up a society without religious persecution
February 9, 2009

english
Excerpts from Walt Whitman’s Song of Myself Number 33 Space and Time! now I see it is true, what I guess'd at, What I guess'd when I loaf'd on the grass, What I guess'd while I lay alone in my bed, And again as I walk'd the beach under the paling stars...
February 9, 2009

chemistry help
how do you balance these chemical equations NH4)3PO4 + Mg (CH3COO)2 -> Mg3(PO4)2 + NH4CH3COO MoO3 + H2SO4 + Zn -> Mo2O3 + H2O + ZnSO4
February 8, 2009

chemistry need help asap
how do you balance these equations? Ag2O -> Ag + O2 C6H6 +O2 -> CO2 + H2O
February 8, 2009

algebra
5x=-2x-6
February 7, 2009

english paper
so basically i am "summarizing" all the different sources but i need to put it all at once...right?
February 6, 2009

english paper
Hello I have a quick question. I have to write an english paper on the recent issues in business. it says that "purpose in writing this report is to SYNTHESIZe current, reported information on a recent issue in bussiness" The reason why i have the work synthesize in ...
February 6, 2009

poop
i hate all of you
February 5, 2009

math
Farmer Brown had some animals. One-fourth were horses, one-half were cows, and the rest were pigs. He had 8 pigs. How many animals did he have altogether? I know you would get a common denominator for 1/4 and 1/2 which would be 4 so you would have 1/4+2/4= 3/4 and then take 4/...
February 4, 2009

algebra
Factor x^2+6x+5 and x^2+8x+15
February 3, 2009

algebra
Simplify x^2-16 and x^2-100
February 3, 2009

english
What information can you get from a poem?
February 2, 2009

algebra II
solve each equation. 5y-2(y+3)=4y
February 2, 2009

algebra II
Solve each a equation. 5x=-2x-6 -5y+7=-18
February 2, 2009

analogies
What is the analogy for South America: Brazil :: North America:
February 2, 2009

math
what is the greatest common factor of 106 and 320
February 1, 2009

chemistry
Hydrogen cyanide is produced industrially from the reaction of gaseous ammonia, oxygen, and methane. 2 NH3(g) + 3 O2(g) + 2 CH4(g) → 2 HCN(g) + 6 H2O(g) If 5.35 103 kg each of NH3, O2, and CH4 are reacted, what mass of HCN and of H2O will be produced, assuming 100% yield...
February 1, 2009

calculus
Compute the area of the region in the fi…rst quadrant bounded on the left by the curve y = sqrt(x), on the right by the curve y = 6 - x, and below by the curve y = 1.
January 31, 2009

calculus
Find the average value of the function on the given interval f(x) = 2x^3(1+x^2)^4, [0,2]
January 31, 2009

calculus
Consider the solid obtained by rotating the region bounded by the given curves about the line x = 6. y = sqrt(x), y = x Find the volume V of this solid.
January 31, 2009

calculus
Consider the solid obtained by rotating the region bounded by the given curves about the x-axis. y = 6 x^6 , y = 6 x , x >= 0 Find the volume V of this solid.
January 30, 2009

science245
In answer to your question yes these are some of the rudest people on the planet. I guess their brains are so huge with information that they do not have the capacity for compassion.
January 27, 2009

algebra
1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h. How long would the drive take at 50 mi/h?
January 27, 2009

algebra
The volume V of a gas varies inversely as the pressure P and directly as the temperature T. A certain gas has a volume of 20 L, and a temperature of 320 K, and a pressure of 1 atm. If the gas is compressed to a volume of 15 L and is heated to 330 K, what will the new pressure...
January 27, 2009

algebra
1. The time t that it takes for a salesman to drive a certain distance d varies inversely as the average speed r. It takes the salesman 4.75 h to travel between two cities at 50 mi/h. How long would the drive take at 50 mi/h?
January 27, 2009

algebra
Direct and Joint Variation 2. The volume V of a rectangular prism of a particular height varies jointly as the length l and the width w, and V = 224 ft when l = 8 ft and w = 4 ft. Find l when V = 210 ft and w = 5 ft.
January 26, 2009

math
Direct and Joint Variation 2. The volume V of a rectangular prism of a particular height varies jointly as the length l and the width w, and V = 224 ft when l = 8 ft and w = 4 ft. Find l when V = 210 ft and w = 5 ft.
January 26, 2009

U.S.History
yes that is the ansswer for sure. good job!
January 25, 2009

algebra
write in standard from: 8.36 x 10^5 and -6.43 x 10^-4
January 25, 2009

algebra II
f(x)=|x-2|-2
January 25, 2009

math
Can you tell me if this could be right? First take 10000x18=180,000 Second divide 180,000 by 12=15000 Third divide 15000by 5280= 2.84 which would round to 3 Please tell me if this could be right
January 25, 2009

math
would you not divide in the first step?
January 25, 2009

math
Suppose that humans walk about 10,000 steps perday on average. Your average step is probably about 18 inches. If so, how many inches per day do you walk? How many feet per day do you walk? How many miles per day do you walk, to the nearest whole mile?
January 25, 2009

math
(6) Which equation is equivalent to 4^-x=8? a. log8 4=x b. logx = -4 c. log -x 4=8 d. log 4 8= -x
January 23, 2009

algebra
i think it is d
January 23, 2009

algebra
Which best describes the following function? f(x)=2^3.5x-7 a. exponential b. linear c.cubic d. quadratic
January 23, 2009

math
What is $600 invested at 9% interest, compounded quarterly, worth in 3 years? a. $640.50 b. $641 c.$762 d.$784
January 23, 2009

algebra
Solve the equation 10 x = 20 for x. a. x=1/2 b.x=2 c.x=1.3 d.x=10
January 23, 2009

Math
Suppose that humans walk about 10,000 steps per day on average. Your average step is probably about 18 inches. If so, how many inches per day do you walk? How Many feet per day do you walk? How many miles per day do you walk, to the nearest whole number?
January 23, 2009

physics
How fast WAS it rolling on the table before it fell off. I don't think the height of the table (1.5m) or distance from table (.8m) are relavent to the problem. Is this a trick problem???
January 20, 2009

physics
A 72 g baseball rolls off a 1.5 m high table and strikes the floor a distance of .8 m away from table. How fast is it rolling on the table before it fell off?? Accel of gravity is 9.81 m/s2.
January 20, 2009

physics
so is it A B OR C
January 20, 2009

physics
A wheel of diameter 0.700 meters rolls without slipping. A point on the top of the wheel moves with a tangential speed of 2.00 m/s with respect to the ground. 1. If the wheel suddenly stops spinning and skis along the ground then a. v=rù b. v>rù c. v<r&...
January 20, 2009

physics
Calculate the speed at the edge of a disc of radius 8.5 cm that rotates at the rate of 4 rev/s. Answer should be in units of m/s Thanks
January 20, 2009

physics
a person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the board by the post ...
January 20, 2009

physics
i am sorry but i don't get how to do it
January 20, 2009

physics
person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the board by the post on...
January 20, 2009

chemistry
Given the following reaction: 4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 How many moles of O2 will be produced if 2.46 moles of CO2 react completely? moles
January 20, 2009

physics
a person stands a distance of 0.300 meters from the right end of a 2.00 meter long uniform platform that is supported by two posts, one at each end. The board has a mass of 20.0 kg and the person's mass is 75.0 kg. a. determine the force exterted on the board by the post ...
January 20, 2009

phil
1. the roosevelt corollary was first put into effect in a. dominican republic b. hawaii c. cuba d. puerto rico i think it is A
January 19, 2009

history
i don't get why it's not A
January 19, 2009

history
1.Which best describes the US foreign relations or policies for the entire 19th cnetury a. american foreign policy frequently became entwined in the issues raised by conflicts between european powers b. the united states maintained a small military and naval establishment ...
January 19, 2009

physics
A quarterback throws the football to a stationary receiver who is 18.3 m down the field. Football is thrown at an angle of 44.9 degrees to the ground. Acceleration is 9.81 m/s2. What initial spped must the quarterback throw ball to reach receiver and what is the highest point ...
January 19, 2009

biology
Suppose that for an organism, 2n=8. How many chromosomes do the organism's gametes contain?
January 19, 2009

chem
I have a problem i don't get... H3PO4+3NaOH -> 3H2O+Na3PO4 How many moles of Na3PO4 will be produced from 1.7 moles of NaOH in the presence of excess H3PO4?
January 18, 2009

physics
225
January 16, 2009

algebra II
y=mx+b (x,y) You multiply x by m, the slope. You get to y by adding b. (2,-4) You multiply 2 (x) by -1/3 (m), the slope. You get to -4 (y) by adding -3.33 (b) = -10/3 Therefore, y=(-1/3)x-(10/3) The next one is done the same way.
January 14, 2009

algebra II
Find the equation of the line With a slope of 2/3 that goes through the point (4, 5) With a slope of (-1/3) that goes through the point (2, -4) With a slope of 3 that goes through the point (-5, -1)
January 14, 2009

english
i think so what do you say
January 14, 2009

english
but do he really admire his father
January 14, 2009

english
i think dislike
January 14, 2009

english
What is the speaker's attitude towards his father? Father My father knows the proper way The nation should be run; He tells us children every day Just what should now be done. He knows the way to fix the trusts, He has a simple plan; But if the furnace needs repairs, We ...
January 14, 2009

business
What is a microsoft surface? And how could I make it better?
January 13, 2009

computer
What is a microsoft surface? And how could I make it better?
January 13, 2009

english
Ozymandias I met a traveller from an antique land Who said: Two vast and trunkless legs of stone Stand in the desert…. Near them, on the sand, Half sunk, a shattered visage lies, whose frown, And wrinkled lip, and sneer of cold command, Tell that its sculptor well those ...
January 13, 2009

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