Thursday
July 31, 2014

Posts by ivan


Total # Posts: 98

math
A gumball machine contains orange, yellow and purple gumballs. The probability of getting an orange ball is 3/4 and the probability of getting yellow ball is1/6. What is the probability of getting a purple ball?

Algebra
List all asymptotes (both horizontal and vertical) of the rational function: f(x)=(10x−3)/(8−7x)

Dynamics
A linear spring of stiffness k is designed to stop the 20-Mg railroad car traveling at 8 km/h within 400mm after impact. Find the smallest value of k that will produce the desired result.

Physics
A linear spring of stiffness k is designed to stop the 20-Mg railroad car traveling at 8 km/h within 400mm after impact. Find the smallest value of k that will produce the desired result.

Dynamics
The man slides the 100-kg crate across force of 200 N. If the crate was initially at rest, how far will the crate move before its speed is 1 m/s? The coefficient of kinetic friction between the crate and the floor is 0.18. The man is pulling the crate at a 20 degree angle.

Math
Thank you Ms. Sue I get the same answer. The problem is that teacher offer this answers: a. 29 cm b. 28 cm c. 27 cm d. 33 cm What did we do wrong?

Math
The length of a rectangle is 3 cm less than 4 times its width. The perimeter is 74 cm. Find the length

Chemistry 2
ok thank you, exactly what i needed to know .

Chemistry 2
For the fist order reaction A <-> B, calculate the t1/2(half life) and k(rate constant) and also fill in the blanks. A-Concetration t-time 20 0 10 ? 5 40 sec 3 ? ? 500 sec t1/2=? k=?

Chemistry 2
ok thank you, whats the formula to find the time of the missing blanks in the question?

Chemistry 2
Thanks man that makes so much clearer. i posted another question similar to this but its a first order reaction. would that change how you work it or is it done the same?

Chemistry 2
For a second order reaction A <--> B, calculate the t1/2 (half life) and the k(constant) and also fill in the blanks. A (concentration) t(time) 20 0 sec 10 ? 5 40 sec 3 ? ? 200 sec t1/2=? k=?

Chemistry 2
ok i got that now thank you. how will i find the answer for the blanks in the time? is there a formula for it?

Chemistry 2
what do you mean?

Chemistry 2
For the fist order reaction A <-> B, calculate the t1/2(half life) and k(rate constant) and also fill in the blanks. A-Concetration t-time 20 0 10 ? 5 40 sec 3 ? ? 500 sec t1/2=? k=?

Chemistry 2
Thanks man both answers you have answered for me have checked out to mine that i have got.

Chemistry 2
When we mix 25.0 mL, 2.0 M BaCl2 with 25.0 mL, 3.0 M Na2SO4 what is the balanced equation? What is the ionic equation? what is the net ionic equation?

Chemistry 2
For the reaction: 2A + 3B <--> 4C Kinetic data are as follows A B time needed 10mL 5mL 720 seconds 20mL 5mL 180 seconds 20mL 10mL 90 seconds 30mL 20mL ?? The rate of the equation is?

Chemistry 2
Thanks man i appreciate it

Chemistry 2
What is the molarity of 50.0 mL solution of aluminum sulfite that contains 80.0 g of this salt? (Al=27.0, S=32.0,O=16.0)

Math
If a varies jointly as b and c, and if a = 100 when b = 5 and c = 25, find a when b = 12 and c = 60

Math
Thanks Reiny

Math
Solve the equation: |6x - 2| = |3x + 1|

physics
Participants in a road race take water from a refreshment station and throw their empty cups away farther down the course. If a runner has a forward speed of 6.20 m/s, how far in advance of a garbage pail should he release his water cup if the vertical distance between the lid...

Physics
Mary walks west at 2.0m/s for 15 seconds, then north at 3.0m/s for 2o seconds and then east at 4.0m/s for 0 seconds. What is her displacement answer is (108m(N56 DEgrees E)

Physics
At that height, you can evaluate the gradient of the normal(which is actually -2.5). then youu find the angle between the horizon and the normal at that height.Let the force acting from the surface along the normal as F.Decompose the force into F_x(parallel to the horizon) and...

math
NELSON GOT A PACK OF 12 PENCILS. HE TOOK 3 PENCILS TO PUT IN HIS DESK AT SCHOOL AND 2 PENCILS TO PUT IN HIS LOCKER AT SCHOOL. WHAT IS THE FRACTION OF TOTAL PENCILS THAT NELSON TOOK TO SCHOOL?

math
On a sunny afternoon. The stratosphere tower casts a shadow that is 140 meters long. At the same a nearby flagpole that is 10 meters tall cast a shadow that is 4 meters long . Wriré silve the problem

Physical Science
A truck whose bed is 2.5m long, 1.5m wide, and 1m high is delivering sand to a construction site. How many trips must the truck make to deliver 7? cubic meters of sand? Plese explain your answer.

Physical Science
A truck whose bed is 2.5m long, 1.5m wide, and 1m high is delivering sand to a construction site. How many trips must the truck make to deliver 7? cubic meters of sand? Plese explain your answer.

physics
A small cork with an excess charge of +7.0 µC is placed 0.16 m from another cork, which carries a charge of −3.2 µC. What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 × 10 9 N · m2 /C 2 . Answer in uni...

physics
Calculate the net charge on a substance consisting of a combination of 8.9 × 10 13 protons and 4.4 × 10 13 electrons. Answer in units of C

physics
A negatively charged balloon has 4.5 µC of charge. How many excess electrons are on this balloon? Answer in units of electrons

physics
An unclothed student is in 24 ◦ C room. If the skin temperature of the student is 37 ◦ C, how much heat is lost from his body in 6 min, assuming that the emissivity of the skin is 0.83 and the surface area of the student is 1.5 m2 . The Stephan-Boltzmann constant i...

Physics
During a certain thermodynamic process a sample of gas expands and cools, reducing its internal energy by 3690 J, while no heat is added or taken away. How much work is done during this process?

English
I need help on; how to contrast Walt Whitman perspective of America with the perspective that the members of Occupy Wall Street and the the Tea Party movement have about America.?

Pre-calculus
2^(x)/(1-2^(x))=3

physical science
absolute zero is the same as

chemistry
hey! help me

chemistry
in saturated sugar solutions what is the solute? what is the solvent?

phy
A 3.50 kg block on a smooth tabletop is attached by a string to a hanging block of mass 2.80 kg. The blocks are released from rest and allowed to move freely. 1-Is the tension in the string greater than, less than, or equal to the weight of the hanging mass? 2-Find the acceler...

phy
correction i- 92 mi/h ii- 0/15 m iii- 803 N

phy
A major-league catcher gloves a 92 {\rm mi}/{\rm h} pitch and brings it to rest in 0.15 {\rm m}. 1-If the force exerted by the catcher is 803 {\rm N}, what is the mass of the ball?

chemistry
1-why should the maximum percent yield never be above 100%?

history
2. Why did European economic practices and financial institutions (trading companies, banks, investments, creation of global markets) weaken Middle Eastern and Asian economies and upset local politics? 3. How did countries or empires in the Middle East and Asia attempt to mode...

history
How did European explorations and commercial activities in the early modern period affect regions of the Middle East and Asia?

math
10 degrees of circle in fraction

nalya sec sch
do people accomplish more to do things in thiere own way

Geometry
How large is an angle whose supplement is three times its complement?

Geometry
If we want to find the height of an object like a flagpole, what type of triangle do I use?

Geometry
An alloy of copper is 10% copper and weighs 25 pounds. A second alloy is 18% copper. How much (to the nearest tenth lb.) of the second alloy must be added to the first alloy to get a 13% mixture.

Geometry
Find the area of the bedroom in square feet of 11' x 13' 10"

Geometry
If a rectangular lot measures 120 ft. x 80 ft., and 10 foot set backs are required from each lot line, how much area is left? If a kennel for 50 dogs requires 12,500 square feet, how many dogs can be accommodated in the small rectangle?

Geometry
Mr. Thompson has been asked to add storage space to a garage. He estimates 6 square feet per individual will be required to meet the needs of 12 people. If the storage space is 15% of the total amount of space required, how much total space does Mr. Thompson have?

Geometry
Two angles are complementary. One contains 20° more than the other. Find both angles.

Geometry
If the boy is 4' 9" tall and his shadow is 6 ft. and the shadow of the flagpole is 19 ft., determine the height of the flagpole (to the nearest tenth).

Geometry
The sides of a triangular lot are represented by x, 2x, and 3x + 2. Find each side if the perimeter is 362 feet. What are the 3 lengths?

Geometry
A square measures 8 inches on each side. What is its area rounded off to the nearest whole number. (Note: 1 inch ≈ 2.54 cm)

Geometry
A trapezoid has an altitude of 12 cm. Its parallel sides measure 10 and 8 cm, respectively. What is it's area?

Geometry
Compute the area of the triangle. (Express answer in cm2) h = 6 cm b = 12 cm a = How many cm2?

Geometry
Compute the area of a triangle with sides. 15 × 15 × 18 a = How many square units?

Geometry
A lot is in the shape of a trapezoid. The sum of the bases is 180 feet. If the area of the lot is 8,100 square feet, what is the distance across the lot, i.e., the altitude of the figure? The altitude of the trapezoid is how many feet?

Geometry
a = 12 ft. b = 8 ft. a = How many sq. ft. ?

Geometry
a = 12 cm b = 14 cm h = 8 cm. Compute the area. How many cm2?

Geometry
Find the area of the following circle. r = 9 yd. a = How many square yards?

Geometry
Find the area of the following ellipse (round to nearest tenth). a = 9 in.; b = 8 in. a = How many sq. in.?

Geometry
Find the area of the following ellipse (round to nearest tenth). 2a = 10 cm; 2b = 24 cm. a = How many cm2?

Geometry
A contractor is pouring a concrete driveway. The perimeter is 108 ft. What length will the driveway be if the width is 12 ft.? How many feet is the Drive Way?

Geometry
A gardener is installing a circular garden. The radius of the circle 28 feet. He needs to know the circumference in order to buy materials for the edging. What is the circumference if he uses = 22/7. The circumference is ?

Geometry
Find the area of the following circle. ( = 3.14; round answer to the nearest whole number). Circumference = 120 cm. (Hint: Find r from C = 2r (round r to tenths); then find area).

calculus5
I understand what you guys think I am a soldier on duty and I have to turn these in I am runnning out of time and I need help thanks

calculus5
I understand what you guys think I am a soldier on duty and I have to turn these in I am runnning out of time and I need help thanks

calculus5
(y^2+2)^3=x^4y+e^2 find dy/dx using differentiating implicity

calculus4
2y^3-y=7-x^4 find dy/dx using differentiating implicity

calculus3
x^2/3+y^2/3=5 find dy/dx using differentiating implicity

calculus2
x^2+2y^2-11=0 find dy/dx using differentiating implicity

calculus1
x^5-5y=6-x find dy/dx using differentiating implicity

Calculus
6x-3y=4 find dy/dx using differentiating implicity

Physics
Four identical 12µC charges are placed at the corners of a square of sides 44 cm, with one additional 12µC charge placed at the center. Find the electric potential at the midpoint of one of the sides.

Calculus 1
Calculate f'(-1) f(x) = x^7 * h(x) h(-1) = 5 h'(-1) = 8 Answer is 27, but I got no idea how to get there.

french
"How many days are there in the month of october?"

3rd math homework
6-4=2 2+4=6 you can use other numbers too 6-5=1 1+5=6 etc.

Math.
420cal = 2.25 cans ? cal = 1can To find the number of calories we just do the cross product, so: 420cal x 1can / 2.25cans = ? cal 420cal/2.25cans = 186.6667cal

English check
Lasted only about a century as a way of life but has persisted as an influence

Electronic Timing inc
good

sunshine math-4
mark hid a 10 bill inside his favorite book. he forgot the pages where he hid it. is the sum of the pages where the bill is hidden is 177, on what pages will mark find his money

math
use the digets 2,4,6,and 8 to create an expression with a value of 2

Alegebra 1
1/35

Stoichiometry
6 NaOH + 2 Al ---> 2 Na3AlO3 + 3 H2 How many moles of NaOH are required to produce 3 g of hydrogen?

Calculus
find the x-coordinate of the point P on the parabola y=1-x^2 for 0<x<1 where the triangle that is enclosed by the tangent line at P and the coordinate axes has the smallest area.

writing
Is this a run-on: Martha moans and groans upon getting in the morning she sounds like a crazy woman.

science
eukaryote

eukaryoyoinacrosticpoem
into

READING
HELP ON HOW TO START A 5TH GRADE BOOK REPORT

math
4 HR AND 47 MIN, WHAT I DONT UNDERSTAND IS WHY DO I CHANGE 6:30 to 5:90, thank you Ms.Sue

math
FIND THE ELAPSED TIME START 1:43 FINISH 6:20 HOW DO I FIND IT

Accounting 1
business

Math-approximation with fractions:7th grade math
in 2001, 32 out of 80 members of New Jerseys House of representatives were democrasts and 25 out of 60 members of oregons house of representatives were democrasts. for each state, write a fraction for the number of democrats in the house to the total number of house members.wr...

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