Friday
December 19, 2014

Posts by bob


Total # Posts: 2,499

materials science
Consider a copper lattice with an excessive average of one vacancy in every 100 unit cells. What will be its density? Compare this to the theoretical density of copper.
January 30, 2012

Chemistry
How many grams of CO2 are formed when 32 g of O2 reacts with 23 g of C2H5OH?
January 29, 2012

algebra
parking lot had a length that is 7 yards greater than thre width. the area of the lot is 450 square yards. what is the length and width?
January 29, 2012

Chemistry
Using VSEPR what is the shape of ammonia (NH3) and water (H2O) when bonded to a hydrogen bond?
January 28, 2012

Chemistry
Using VSEPR what is the shape of ammonia (NH3) and water (H2O)?
January 26, 2012

Math
Rebecca gives gifts to 12 employees. Each gift is in a box that is 12 inches by 10 inches by 3 inches. How much wrapping paper does Rebecca need to completely the cover the boxes? F. 360 in(insert exponent 2) G. 1,720 in(insert exponent 2) H. 4,320 in(insert exponent 2) J. 14,...
January 25, 2012

Chemistry
1000
January 23, 2012

Chemistry Lab
we reacted acetic acid with butanol and formed butyl acetate which is supposed to smell like banana but it smelled like sharpie/nail polish remover why might this be
January 22, 2012

chemistry
An insulated beaker contains 250.0 grams of water at 25C. Exactly 41.6 g of a metal at 100.0C was dropped in the beaker. The final temperature of the water was 26.4C. Assuming that no heat is lost in any other way, calculate the specific heat of the metal.
January 21, 2012

Physics
A wooden block of mass 29.0 kg sits on a horizontal table. A wire of negligible mass is attached to the right side of the block and goes over a pulley (also of negligible mass, and frictionless), where it is allowed to dangle vertically. When a mass of 15.5 kg is attached to ...
January 20, 2012

physics
An astronaut in his space suit has a total mass of 275 kg. His weight on the asteroid Erewhon is 0.3 N. What is the acceleration of gravity on Erewhon?
January 20, 2012

math
what is the sum of the odd numbers 1-2009
January 18, 2012

pre cal
Given triangle ABC, A = 120, a = 8, b = 3; determine B to the nearest whole degree
January 18, 2012

physics
Hey there, Did anyone give you an answer? I'm just wondering because I too have a similar question.
January 17, 2012

physics
Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 82.0 m and the coefficient of friction is 0.39?
January 16, 2012

finance
12.2%
January 11, 2012

chemisty
The molar heat capacity of C6H6(ℓ) is 136 J/mol ·◦C and of C6H6(g) is 81.6 J/mol · ◦C. The molar heat of fusion for benzene is 9.92 kJ/mol and its molar heat of vaporization is 30.8 kJ/mol. The melting point of benzene is 5.5 ◦C, its ...
January 11, 2012

chemistry
When 0.373 g of compound X is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.341 C is observed. What is ∆Urxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3.19 kJ/ ◦C...
January 11, 2012

math
4square root.Of 5
January 10, 2012

PARALLELOGRAM WRITING A PROOF
given 1.vx is con to xt by csctc ux con xs 2. x is midpoint of those 2 lines 3.vuts is a paarlelogram
January 8, 2012

physics
A 640-kg racing car completes one lap in 14.3 s around a circular track with a radius of 45.0 m. The car moves at constant speed. (a) What is the acceleration of the car? m/s2 (b) What force must the track exert on the tires to produce this acceleration?
January 6, 2012

Physics
65
December 20, 2011

Physics
A 18 kg object and a 26 kg object are connected by a massless compressed spring and rest on a frictionless table. After the spring is released, the object with the smaller mass has a velocity of 2 m/s to the left. What is the velocity of the object with the larger mass?
December 20, 2011

Math
Five employees at the Wild Fowl Publishing Company each come to work by a different one of five means: car, railroad, subway, and walking. They hold these positions at the company: art director, editor, publisher, receptionist, and secretary. Two of them are men named Finch ...
December 15, 2011

math
A popular new secretary at the law firm of Farnsworth, Newman, O’Malley, Price, and Reynolds, is taken to lunch by a different one of those five men on each of her first week on the job. Each man took her to eat at a different one of these five types of food: Chinese, ...
December 15, 2011

chem
How many grams are in 3.6 moles of agcl2?
December 15, 2011

math
what is equivalent to 98% o.49 or 100/98 or o.98 or 49/100
December 15, 2011

6 th grade Math
You can find the total number of different 4-digit numbers of choices for each digit (9) to the number of digits (4), or 9 to the 4th power. Based on this pattern, how many different 5-digit numbers could you make from the digits 1 through 8?
December 14, 2011

math 6th grade
How to write out 10 the negative 6?
December 14, 2011

math 6th grade
How to write out 10 to the negetive two?
December 14, 2011

math 6th grade
(1/2) to the 5th power= Need to know how to write this?
December 14, 2011

chemistry
Atom X has atomic mass (A) = 40 and atomic number (Z) = 20. Atom Y has A = 42 and Z = 20. How are these two atoms related?
December 12, 2011

Math Grade 3
You move the decimal to the left for example: 123 divide by 10 is 12.3
December 12, 2011

chemistry
. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added? ***Dr BOB222 THE 4:1 RATIO IS ...
December 11, 2011

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added?
December 11, 2011

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added?
December 11, 2011

chemistry
by moles
December 11, 2011

chemistry
6. Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1 moles ratio. What volume of compound D is to be added?
December 11, 2011

can you please look over my answers? clauses
Select the abbreviation that tells how the italicized noun clause is used. S-subject, DO-direct object, SC-subject complement, OP-object of preposition A lecture on cleanliness was not what the children wanted to hear.
December 11, 2011

trig
The manufacturer of a propeller for a small aircraft mandates a maximum operating angular velocity of 300 rad/s. Determine whether it is safe to install this propeller whose aircraft whose engine is expected to run at a maximum of 2800 rpm
December 10, 2011

chemistry
the ratio is moles
December 10, 2011

chemistry
Compound C (MW = 550) is provided at a concentration of 25g/100mL. 1mL is taken and compound D is to be added (MW = 1025, concentration = 75mM) to give a final ratio of compound C:D of 4:1. What volume of compound D is to be added?
December 10, 2011

help!!!!
A navy destroyer is exactly 68 miles North of an aircraft carrier, which is travelling West 21 degrees North at 18 mph. what speed and bearing must the destroyer maintain if it is to reach the aircraft carrier in exactly 3 hrs? is it 226mph?
December 8, 2011

pre calc
each of three circles touches the other 2.circle A has a radius of 8 cm. circle B has a radius of 4 cm.circle C has a radius of 1 cm.a triangle is formed by connecting the centers of the 3 triangles. determine the largest angle for the triangle and in which circle is the ...
December 8, 2011

pre calc
you are 7 miles north and 4 miles west of a cabin.how far are you from the cabin? on what bearing must you walk to reach the cabin?
December 8, 2011

math
find all solutions on 0 is greater than or equal to theta < 2pi cos theta= 2sqrt3/3 4-1/2sin theta= (-16+sqrt3)/4 3(sqrt3)= -3cot theta -2=-1-2sin theta
December 8, 2011

math
the hour hand of a clock is 5 inches long and the minute hand is 6 inches long. determine the distance between the tips of the hands at 11:40 pm????
December 8, 2011

science
Is melting ice a physical or chemical change? I think it is a physical change. Am I correct?
December 8, 2011

geometry
do ur own homework
December 8, 2011

la poetry
i need help with narrative soccer
December 7, 2011

physics
An 77 person stands on a uniform ladder 4.0 long, that weighs 100 , as shown in the figure . The floor is rough; hence, it exerts both a normal force, , and a frictional force, , on the ladder. The wall, on the other hand, is frictionless; it exerts only a normal force, . the ...
December 7, 2011

Physics
A 86.0 kg diver falls from rest into a swimming pool from a height of 6.3 m. It takes 1.44 s for the diver to stop after entering the water. Find the magnitude of the average net force exerted on the diver during that time.
December 6, 2011

physics
Gas is confined in a tank at a pressure of 10 atm and a temperature of 14◦C. If 58 percent of the gas is withdrawn and the temperature is raised to 50◦C, what is the new pressure in the tank?
December 5, 2011

chemistry
4.89 atmospheres
December 5, 2011

Math
Rewrite cos(arcsin(v)) as an algebraic expression in v. i know that the answer is squroot of 1-v^2 but i dont know the process of how to come to this answer. Thanks for the help!
December 4, 2011

10th grade World History
fdsgdfgdfgsdf
December 3, 2011

physics
A spaceship of mass m travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. (a) At what distance from the center of the Earth is the force due to the Earth three times the magnitude of the force due to the Moon?
December 2, 2011

math
WAZUPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP NMY FRIEND HAHA
December 2, 2011

math
HIHIHIH
December 2, 2011

calculus
What is the area under each of the given curves? y=e^x/2 ; x=0 x=1
December 1, 2011

English 7 Essay: Rosa Parks (Ms. Sue)
hi
December 1, 2011

Calculus
for the function F(t)=ln(t^2), let f(t)=F'(t). Write the integral from a to b of f(t) dt and evaluate it with the fundamental theorem of calculus. the integral from 1 to 3 ___ dt= __
November 30, 2011

Economics
Suppose that some firms in a competitive industry are earning zero economic profits, while others are experiencing losses. All else equal, in the long run, we would expect the number of firms in the industry to A. increase. B. decrease. C. remain the same. D. We do not have ...
November 29, 2011

Economics
If the market price falls below $4.50, the firm will earn A. positive economic profits in the short run. B. negative economic profits in the short run but remain in business. C. negative economic profits in the short run and shut down. D. zero economic profits in the short run.
November 29, 2011

Economics
A long-run supply curve is flatter than a short-run supply curve because A. firms can enter and exit a market more easily in the long run than in the short run. B. long-run supply curves are sometimes downward sloping. C. competitive firms have more control over demand in the ...
November 29, 2011

math
what is 2 times 5
November 28, 2011

Physics
Four particles in the xy plane have the following masses and coordinates: 1 kg at (3 m, 3 m), 2 kg at (-2 m, 4 m), 3 kg at (3 m, -2 m) and 4 kg at (-3 m, -4 m). Find the total moment of inertia about: x-axis? y-axis? z-axis?
November 28, 2011

history
where can i get facts about winchester cathedral
November 20, 2011

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
November 18, 2011

ELA
Those were great :D But do you have anymore ideas? We need to write at least a full page
November 17, 2011

ELA
Not that kind of funny but like its from this book and here was an example Don't bite your fingernails because the nails will look nasty. But the real reason not to bite your nails is cause when you take off a nail and it goes on the floor it will grow on the floor and it ...
November 17, 2011

ELA
I have to do this project and I have to say what funny stuff could happen if I cleaned my room. I dont know anything funny that could happen. so help me? :D
November 17, 2011

math
i dont know
November 16, 2011

physics
nkkn
November 15, 2011

Physics
(3kg)(8m/s)+ (5kg)(0m/s) 24kg*m/s = (3kg+5kg)vf (8kg)vf 24kg*m/s=(8kg)vf vf=3m/s
November 15, 2011

Physics
150kg*m/s
November 15, 2011

Math
what up
November 15, 2011

Math, Please Help!!!
an engineer designs a satellite dish with a parabolic cross section. The dish is 15 ft wide at the opening and the focus is placed 4 ft from the vertex. find an equation of the parabola. I know how to work this problem, but how do I know that I use the equation y^2 = 4px ...
November 15, 2011

READING
Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is...
November 14, 2011

Reading
Is it LINE 15?
November 14, 2011

Reading
Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is...
November 14, 2011

Chemistry
When non-polar materials suddenly become polarized the most likely reason is due to:
November 14, 2011

Reading
WAIT no line 15
November 14, 2011

Reading
Which line in the poem contains an example of onomatopoeia? A. Line 6 B. Line 7 C. Line 14 D. Line 15 Line 6: and you'll forget all about that broccoli you chop Line 7: Rock candy looks like beautiful glass Line 14: but spinach tastes all gritty and sandy Line 15: Taffy is...
November 14, 2011

Reading
Since the 1st line ends with me and the next line ends with disagree The first line is A and the next line is B?? Then the third line ends with true and the next line ends with chew so its AABB?
November 14, 2011

Reading
Does me and disagree rhyme? it doesn't right?
November 14, 2011

Reading
Ok heres some of it Mom says that vegetables are good for me, but I am afraid I must disagree. Candy is better. I just know it's true! Because bubble gum helps me learn how to chew
November 14, 2011

Reading
What is the rhyme scheme of "Great Glorious Gobs"? A. ABAB B. BBBA C. AABB D. AABA
November 14, 2011

Calculus- rates
5
November 13, 2011

Calculus- rates
5
November 13, 2011

Social Studies
what is your primary duty if you are at electoral college
November 12, 2011

trig/math
If A is between 270degrees and 360degrees, and cos A=12/13, find the exact value of: sin2a, cos2a, sin1/2a, cos1/2a
November 11, 2011

Math, Please Help!!!
a hot air balloon is rising vertically 10 ft/sec while the wind is blowing horizontally 5ft/sec. Find the speed of the balloon and the angle x that it makes with the horizontal. I know that the speed of the balloon is the square root of (10)^2 + (5)^2, but I was wondering if ...
November 10, 2011

6th grade Math
Light travels about 1 mile in 0.000005 seconds. If a spacecraft could travel at this speed, it would travel almost 10 to the 6th power miles in 5 seconds. About how far would this spacecraft travel in 50 seconds?
November 9, 2011

algebra
s^2-4/(s+2) Simplyby removing factors of 1
November 8, 2011

Science
What are they asking in this question? Which is an alternative source of energy?
November 8, 2011

Science
What are they asking in this question? Which is an alternative source of energy?
November 8, 2011

Science
I think its corn fields but im not sure
November 8, 2011

Science
corn fields?
November 8, 2011

Science
Which source is not a source for fossil fuels? coal mine ancient swamps ancient living organisms corn fields
November 8, 2011

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