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September 14, 2014

Posts by bob


Total # Posts: 2,387

math
andy has 23 coins worth 3.65 consisting of only quarters and dimes.how manydimes does he have?
October 5, 2010

VESPR theory
But is a molecule with an electronic geometry of tetraheydral and a molecular geometry of bent the only one like that? Why doesn't a square pyramidal have <120 degree angles when it has a lone pair? Or does it? I feel like more of the bond angles should be less than the...
October 5, 2010

VESPR theory
On one of my pages of notes, it lists all the different shapes and the bond angles that go along with them. Next to bent (2 lone pairs, 2 bonds), it says <109.5 degrees for bond angles. I don't understand why that one is less than 109.5, when a trigonal pyramidal isn&#...
October 5, 2010

VESPR theory
Is a bent tetraheydral the only shape that doesn't have a precise angle (as in it's less than 109.5 degrees)?
October 5, 2010

Physics
Forgot to put my question at the end of it XD This is from me trying to interpret what you've done in the previous times this question has been asked, but obviously, I'm wrong somewhere. At what point in the work am I messing up?
October 3, 2010

Physics
Let me try to clarify v1=22.222 m/s v2=13.278 m/s x=vi(t)+1/2a(t^2) 56.7=22.222t+1/2a(t^2) 24.4=13.278t+1/2a(t^2). Through elimination 32.3=8.94t t=3.611s From there I separated to -vi=at as vf is 0 -22.222=a(3.611) -13.278=a(3.611) -35.5=7.222a a=-4.92 m/s^2
October 3, 2010

Physics
To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 80.0 km/h, and 24.4 m when the ...
October 3, 2010

calculus
Find the sum of the series (-1)^n (5^(2n))/n! 1. sum = e^25 2. sum = e^−5 3. sum = 5 4. sum = e^5 5. sum = 25 6. sum = e^−25
September 30, 2010

calculus
017 10.0 points Lance Armstrong is moving with speed 35 feet/sec and acceleration 4 feet/sec2 when he crosses the starting line of a stage in the Tour de France. Use a degree two Taylor polynomial T2(t) to estimate how far he travels in the next second. 1. distance = 38 feet 2...
September 30, 2010

1st grade
2 bones + 3 dogs is 5 objects or 2 bones - 3 dogs = -1 bones
September 27, 2010

Chemistry
What is the chemical equation for white flour? Thanks!
September 27, 2010

Chemistry
How many molecules are in 2.6 grams of H2O?
September 26, 2010

phy
a=6750
September 26, 2010

calculus
With power series, is an endpoint convergent if you plug it back into the original series, and get an alternating series that is conditionally convergent?
September 22, 2010

Chemistry 1145
These UV photons can break chemical bonds in your skin to cause sunburn—a form of radiation damage. If the 310 nm radiation provides exactly the energy to break an average chemical bond in the skin, estimate the average energy of these bonds in \rm kJ/mol.
September 22, 2010

Algebra 1
trtyrt
September 21, 2010

Geometry
The perimeter of a regular pentagon is 31 cm. Find the length of each side.
September 21, 2010

Math
z x 12 = 60
September 21, 2010

science
2000
September 20, 2010

math
75Z% lil lames
September 20, 2010

physics 2
yo mama
September 19, 2010

physics
Aerial skiing involves speeding down a steep ramp that curves sharply upward at the end to launch the skiers into the air. Once airborne, the skier twists and turns in complex combinations to score points in the competition. Consider an aerial launch ramp that has a final ...
September 19, 2010

calculus
The sum from n=1 to infinity of cos(npi/3)/n! Does this absolutely converge, conditionally converge, or diverge?
September 19, 2010

cjs 230
I need some information for the project that I can use not word for word in my own words.
September 18, 2010

cjs 230
I need help with my final project in cjs/230
September 18, 2010

Biology
Wow, your no help Sra
September 18, 2010

health
What would be the major steps in implementing electronic health record proposal? I have some ideas are they right? planning commitmment of staff active involvement training
September 17, 2010

health
Describe a place where organizations share information among competitors electronically.
September 17, 2010

chemistry
A 281 lb fullback runs the 40 yd dash at a speed of 23.0 ± 0.1 mi/h.(a) What is his de Broglie wavelength (in meters)?(b) What is the uncertainty in his position? i determined the wavelength correctly, but how do you determine the uncertainty
September 16, 2010

Chemistry
8.6*10^-19
September 15, 2010

5th grade economics
i am a 4-digit number greater than 9000. My hundreds digit is twice than ny ten digit. My ones digit is greater than my tens digit. The sum of my digit is 20. What number am i?
September 14, 2010

math
a person has $4 in nickles, quarters, and dimes. there is a total of 36 coins altogether. the number of quarters is 4 less then the number of dimes. Algerbaicly determine the number of each type of coin using a system of 3 equations with 3 variables.
September 13, 2010

science
What are the chemical elements in citric acid?
September 13, 2010

math
how many differnt ways can 50 players in a marching band be arranged in rectanagle arrangement?
September 12, 2010

chemistry
Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 18.5-\rm g sample of tin that absorbs 183 {\rm J} when temperature increases from 35.0 ^\circ \rm C to 78.6 ^\circ \rm C
September 12, 2010

8th grade Math
what is more dense 14cm3 or 8cm3
September 9, 2010

math
I can't find the variable and expression for the poulation of oakland. Here's something to help you with Oakland, California is 5,417 less than the poulation of omaha, nebraska.
September 8, 2010

english
LOL! Is this for the Dillon's gift card?
September 8, 2010

math
andy and kate are running around a 400 meter track. if they run in the same direction. andy will pass kate in 100 secounds. if they run in the opposite direction they will meet in 25 seconds. what is andys velocity in meters per seconds?
September 8, 2010

Physics
The problem contains graphics that I don't know how to show other than in an image format: h t t p : / / b i t . l y / c D H P V M h t t p : / / b i t . l y / 9 m b y C R
September 7, 2010

Physics
A long jumper jumps at a 45 degree angle towards the right bank which is 10.0 m away horizontally and 2.5 m vertically below. How long, or short, of the opposite bank will she land?
September 7, 2010

Algebra 2 URGENT PLEASE HELP
h t t p : / / b i t . l y / b z p B K 9
September 7, 2010

Algebra 2 URGENT PLEASE HELP
f(x1)=y1 ------------ f(-1)=1 So x1=-1 and y1=1 f(x2)=y2 ------------ f(1)=-2 So x2=1 and y2=-2 We have two points: (x1, y1) and (x2, y2) = (-1, 1) and (1, -2). The slope between those two points is (y2-y1)/(x2-x1) = (-2-1)/(1-(-1)) = -3/2 = m The equation for a line is (y-y1...
September 7, 2010

physics
How far does the object travel during this time?
September 5, 2010

physics
An object with an initial velocity of 5 m/s accelerates uniformly for 15 s. (a) If the final velocity is 37 m/s, what is the acceleration?
September 5, 2010

geometry
Make a conjecture about the next item in the sequence:2-6,18,-54
September 2, 2010

math
a 9 percent salt water solution is mixed with 4 oz. of an 18 percent salt water solution in order to obtain a 15 percent salt water solution. how much of the first should be used?
September 2, 2010

analogy
dock is to what as park is to garage? open is to close as retreat is to what?
September 1, 2010

9th grade
what does it mean to name the intersection of the planes in a triangular prism
August 31, 2010

Math
6/5hrs
August 31, 2010

Math
Solve: 5g² - 13g + 6 = 0
August 31, 2010

Algebra
-1<5-2p<5
August 26, 2010

math
drove from rich to boston at avg speed of 50 mph,if it took 5 hrs to drive from rich to phila at an avg speed of 70 mph and if the whole trip took 13 hrs how far is it from phila to boston?
August 25, 2010

algebra
(1/t-1)-(1/t+2)
August 25, 2010

math
what is range
August 24, 2010

math
how many ways are there to chose a three digit lottery number? numbers like 003,014,222,232 or 123 are all allowed.
August 18, 2010

math
suppose T is a right angle whose sides have a b c. is it possible that each of a b c is an odd integer?
August 12, 2010

arithmetic
In a certain arithmetic sequence, t6 + t15 = –141 and the common difference is –7. What is the first term of the sequence? explain how to do this please
August 11, 2010

math
the digits of a two digit number are reversed. when both of these numbers are added the result is 88 and when subtracted the result is 54. the original two digit number contains which of the following digits 2 3 5 or 7
July 28, 2010

Chemistry
Don't you mean divide? Don't you get L^2mol /mol^2 Lxs The thing is idk if it can be reduced to L/molxs or A) Can it?
July 24, 2010

Chemistry
What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting
July 24, 2010

Chemistry
When zinc, iron and lead are reacted with hydrochloric acid the variable most easily measured in order to determine the effect of the chemical nature of the reactants on reaction rate is a)temperature b)colour c)surface area d)volume of gas e)concentration Think it's d. Am...
July 24, 2010

Chemistry
What is the overall order of reaction for the elementary system A+2B=products? a)0 b)1 c)2 d)3 e)5 Can somebody explain this question to me. I don't get it.
July 24, 2010

Chemistry
So the answer is a?
July 24, 2010

Chemistry
Consider the following two thermochemical equations N2+2.5O2-> N2O5(s) Delta H=xkJ N2+2.5O2-> N2O5(g) Delta H=ykJ The enthalpy change in kJ for the sublimation of one mole of N205 solid to gas would be represented by the quantity a)x+y b)x-y c)y-x d)-x-y Assuming it'...
July 24, 2010

Chemistry
Can you explain why you have to subtract the other way?
July 24, 2010

Chemistry
I thought what your suppose to do is -1275 - ((-875) + (-283))= -117kj/mols Don't u just subtract? To find the difference?
July 24, 2010

Chemistry
The molar enthalpies of combustion of CH3COCOOH(l)CH3COOH(l) and CO(g) are respectively -1275kJ/mol, -875kJ/mol, and -283kJ/mol. What is the enthalpy change for the reaction below? CH3COCOOH= CH3COOH +CO a)1867kJ b)-1867kJ c)117kJ d)-117kJ e)-2433kJ I think it's d)
July 24, 2010

Chemistry
The pressure of a gas is 35 atm at a temperature of 48 (degrees) C with constant volume. What will the new pressure be if the temperature is increased to 36 (degrees) C?
July 23, 2010

Finance
if you bought 12,000 shares of stock at .50 per share and the stock falls to .25 per share how many additional shares would you have to buy to get your bottom line down to .25
July 21, 2010

algebra
Invest $5,000 in a savings account at 6.6% interest compounded monthly
July 20, 2010

math
weighted coin has property that heads comes up 60 percent of time. two flips of coin is it more likely that outcome from two flips are the same or outcome from two flips are different?
July 14, 2010

geometry
How many hours will it take a bicyclist traveling 17.6 feet per second to finish a 90-mile race? Round your answer, if necessary, to the nearest tenth.
July 13, 2010

geometry
Why don't parallel lines exist in elliptical geometry?
July 13, 2010

GEOMETRY
A __________ __________ touches every vertex exactly once, but does not return to its origin. ________________________________________ A. Hamiltonian circuit B. Hamiltonian path C. Euler circuit D. Euler path
July 13, 2010

GEOMETRY
Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above
July 13, 2010

geometry
Which of the following are measurements of the sides of a right triangle? ________________________________________ A. 3, 4, 5 B. 28, 26, 12 C. 17, 14, 6 D. all of the above
July 13, 2010

geometry
The width of a rectangle is 6 feet, and the diagonal is 10 feet. What is the area of the rectangle?
July 13, 2010

chem 121
^good hints
July 9, 2010

Geometry
Which of the following is NOT a way you can show that triangles are similar? ________________________________________ A. AAA similarity B. SAS similarity C. SSA similarity D. SSS similarity
July 8, 2010

Geometry
If an object is reflected twice over parallel lines, and corresponding points of the original and final translation image are 30 centimeters apart, how far apart are the parallel lines?
July 8, 2010

science
Ear defenderes reduce the amount of noise (sound power) that gets to your ears by producing a physical barrier that absorbs the noise and muffles it.
July 8, 2010

Geometry
nvr mind i found it its c
July 8, 2010

Geometry
Congruent triangles have a relation. Which is not an equivalence relation? ________________________________________ A reflexive B symmetric C distributive D transitive
July 8, 2010

algebra
solve by subsitution 6x + 5y = 27 x = 17 -8y my answer was (3,-7)
July 8, 2010

Geometry
Points (5, 3) and (6, 2) lie on line k. Which is the slope of the line that is parallel to k?
July 7, 2010

algebra
find the slope (4,-4)
July 7, 2010

Geometry
The side of a square measures 3 cm. What is its area?
July 1, 2010

Physics
I have a formula for inertia torque T(inertia) = .09 x Wk^2(inertia)/S(stops) x t(move)^2 This is a shaft that indexes 36 degrees at a time so that how we determine 10 stops for S. I do not know where the factor .09 comes from. Can you explain
June 25, 2010

Physics
I have a formula for inertia torque T(inertia) = .09 x Wk^2(inertia)/S(stops) x t(move)^2 This is a shaft that indexes 36 degrees at a time so that how we determine 10 stops for S. I do not know where the factor .09 comes from. Can you explain
June 25, 2010

geometry
ur mom
June 16, 2010

Statistics
there are 120 possible sample of size n=3 which can be drawn from this population of 10 score: 3,4,5,6,7,8,9,10,11,12
June 16, 2010

TI-83 CALC PROGRAM
F you
June 14, 2010

geometry
a bug lives on a corner of a cube and is allowed to travel only on the edge of the cube. in how many ways can bug visit each other of the other seven corners once and only once, returning to its home corner only at the end of the trips?
June 13, 2010

geometry
a bug lives on a corner of a cube and is allowed to travel only on the edge of the cube. in how many ways can bug visit each other of the other seven corners once and only once, returning to its home corner only at the end of the trips?
June 13, 2010

Math
A television manufacturer makes console and wide-screen televisions. The profit per unit is $125 for the console televisions and $200 for the wide-screen televisions. Write the objective function that describes the total monthly profit. Write a system of three inequalities ...
June 12, 2010

Math
Objective Function z = 3x - 2y Constraints x > or equal to 1 x < or equal to 5 y > or equal to 2 x - y > or equal to -2
June 12, 2010

Math
Using 3.14 for pi, rounding to the nearest tenth, if necessary. A spherical storage tank has a diameter of 48 ft and is full of water. How many delivery trucks with cylindrical tanks measuring 8 ft in diameter and 10 ft long can be completly filled from the storage tank?
June 12, 2010

chemistry
Calculate the hydroxide ion conc. and the % ionization @20oC in a 1.25 M NH3 solution. The Kb for NH3 = 1.70x10-5 @20oC.
June 10, 2010

Trigonometry
Okay that makes sense. I knew i was overlooking something. Thanks for the help Reiny! it really helped me out
June 9, 2010

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