# Posts by bob

Total # Posts: 3,273

physics
What angle does the tangent to the curve y(x)=sin^2(x/9)+16sin(x/9) at x=9\pi make with the x-axis?

physics
E^2/(e^(E/T)-1)Evaluate dn/dE at fixed T and enter it below.

Math [Interest]
Okay, so I've been away from school for three weeks, and we have a math test tomorrow. I only just found out, and my friend emailed me the review questions. If someone could help me out, and show me how to do this, I'd appreciate it. No, I do not want someone to do my ...

math
it is impossible

Finance
21

spanish
what does que te encatanda mas,el chocolate o la pizza mean

Physical Science
Would the change be a negative number?

Physical Science
A 1.0 kg glass bowl at 37 °C is placed in a freezer. How much heat will the freezer have to remove from the bowl to take it to 0 °C? (cglass = 0.2 cal/deg-gm)

Trig
If b=5 , the angle C=50 and the angle A=50 find the other angle B and the remaining sides and . Give your answer to at least 3 decimal places.

Chemistry
A. 1.6×±0^-4 M B. 6.3% C. 3.2×±0^-4 M

engineering
Using mechanics of materials principles, (i.e. equations of mechanical equilibrium applied to a free-body diagram), derive the following equations: s’ = s cos2q = s[(1+ cos 2q) / 2] t' = s sinq cosq = s [sin 2q / 2] s=sigma, q=theta, t=tau I have looked in "...

Math Algebra
kassie an kesya are dividing $39 into two parts in order that the sum of 2/3 of one part and 3/4 of the other part is$28. What are the parts?

PLEASE HELP
WOULD IT BE 13 OVER 30

PLEASE HELP
PLEASE ANSWER THE FRACTION 14 OVER 15 - THE FRACTION 1 OVER 2. HURRY!

calc
(e^x + e^-x)/2=1

Math
so the answer is 7/12?

history
i know how to write an essay, it's this topic that i need help with, like what can you learn from it? and was it neccesary or not?

history
explain reign of terror face in the french revoloution. discuss robesperre's involvement and evolution of \his political views. do u think it was neccessary in the revolution? what lessons can be learned from this event? i have to write an essay on this please give me any ...

math
wouldnt the distance be 3 miles though if the one mile train must travel 1 mile (distance of itsself) plus the distance of the other train which is 2 miles?

math
a freight train that is 1 mile long is traveling at 60mph. a second train that is 2 miles long is traveling 40mph. the trains are moving in opposite directions on parallel tracks. how many seconds does it take between the time their locomotives meet and their cabooses fully ...

math
find a such that f(x)= ax2-4x+3 has a maximum value of 12

math
find a such that f(x)= ax2-4x+3 has a maximum value of 12

calculus
Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.

calculus
Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.

calculus
find the area of the region bounded by the polar curve r=sqrt(6ln(theta)+3 as well as the rays theta=1 and theta=e

psychology
dont know

Algebra 2
Let (x1,y1) be a solution, other than (0,0), of a direct variation equation. Write an second direct variation equation whosegraph is perpindicular to the graph of the first equation.

Physics
Two identical point charges are fixed to diagonally opposite corners of a square that is .5m on a side. Each charge is 3.0E-6 C. How much work is done by the electric force as one of the charges moves to an empty corner?

Science
A mixture of 10.902 g if iron(II) oxide and 6.524 g of aluminum metal is placed in a crucible and heated in a high temperature oven, where a reduction of the oxide takes place: 3 FeO(s) + 2Al(ℓ) ! 3 Fe(ℓ) + Al2O3(s) . What is the limiting reactant? What is the ...

Chemistry
1.19 atm

chemistry
express liquid pentanol and gaseous oxygen as a chemical reaction

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

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...

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&#...

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)?

English
its b

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?

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

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 ...

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

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...

1st grade
2 bones + 3 dogs is 5 objects or 2 bones - 3 dogs = -1 bones

Chemistry
What is the chemical equation for white flour? Thanks!

Chemistry
How many molecules are in 2.6 grams of H2O?

phy
a=6750

science
middle letter is b but cant find the stupid answer!

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?

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.

Algebra 1
trtyrt

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

Math
z x 12 = 60

science
2000

math
75Z% lil lames

physics 2
yo mama

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 ...

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

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

cjs 230
I need help with my final project in cjs/230

phy
This question is impossible u should just quit

Biology
Wow, your no help Sra

AP Chemistry
You're all jerks 4 isn't the answer

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

health
Describe a place where organizations share information among competitors electronically.

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

Chemistry
8.6*10^-19

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?

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.

science
What are the chemical elements in citric acid?

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

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

8th grade Math
what is more dense 14cm3 or 8cm3

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.

english
LOL! Is this for the Dillon's gift card?

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?

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

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?

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

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...

physics
How far does the object travel during this time?

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?

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

6th grade math
How can you cut 3 sandwich for 8 people

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?

analogy
dock is to what as park is to garage? open is to close as retreat is to what?

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

Math
6/5hrs

Math
Solve: 5g² - 13g + 6 = 0

physics
A certain airplane has an acceleration of 15.0 m/s2 How fast will it be moving2.5s after it starts down runway How far down runway during the 2.5s

Algebra
-1<5-2p<5

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?

algebra
(1/t-1)-(1/t+2)

math
what is range

12th grade maths
5/6=1/3-x please solve

physics
41.209

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

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?

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

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