Saturday

October 1, 2016
Total # Posts: 764

**Physics**

A batted baseball leaves the bat with a velocity of 41.4 m/s at an angle of 51.2°. If the ball just barely clears the 3.05 m (10 ft) center field wall, a. How long was the ball in the air? ___s b. What must the range be from home plate to the center field wall? ___m c. How...

*September 25, 2016*

**Physics**

Physics teacher has this question for hw. 38. An electric powered model car starts from rest and moves in a straight-line for 4.0 s. The relationship between time and position is x^2+ 2 t^2 = 32, t in seconds and x in cm. Find the velocity at t= 1 s & t = 3 s. he gave us the ...

*September 17, 2016*

**Chemistry**

When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 26.4 g of carbon were burned in the presence of 82.1 g of oxygen, 11.7 g of oxygen remained unreacted. What mass of carbon dioxide was produced? Express your answer to one decimal place and ...

*September 14, 2016*

**Educational Technology and Online Learning**

what is the purpose of the introduction in an expository essay

*September 14, 2016*

**Math**

Whats the function rule when inputs 2,3,4,5 and outputs 2,5,8,11?

*September 7, 2016*

**Maths**

Ruby has 20 oranges. she eats 3/5 of the oranges. How many oranges did she eat

*June 6, 2016*

**Maths**

how to solve 150 pupils went to concert.3/4 of the number of boys was equal to 1/7 of the number of girls. how many boys went to the concert?

*May 4, 2016*

**Geometry **

A vertical pole 24ft. high is to be braced securely by four wires attached 8ft. from the top. If the wires are fastened to stakes in the level ground at the vertices of square with its center at the foot of the pole and sides 20ft., what should be the length of each wire?.

*April 30, 2016*

**Chemisty**

Will Cd(OH)2 precipitate if 10.00 g of Cd(NO3)2(s) (MM = 236.42 g/mol) is added to 0.500 L of a 0.800 M NH3 solution?

*April 13, 2016*

**Math**

The large rectangle shown, is composed of five congruent smaller rectangles, each with whole number dimensions. If the perimeter of each smaller rectangle is 20 com, find the are of the entire large rectangle in sq cm.

*March 17, 2016*

**Physic**

A large concave mirror has radius of 6.32m. To magnify an object 1.25m tall by a factor of +2.5 Must the object be placed Will the image appear to be Describe the image 3 things What is the image height

*March 1, 2016*

**Physic**

A large concave mirror has radius of 6.32m. To magnify an object 1.25m tall by a factor of +2.5

*March 1, 2016*

**Chemistry**

Using the equation: 2C2H6 + 7O2--> 4CO2 + 6H20 How many moles of CO2 are produced by the reaction of 21.0 mol O2? Again, not sure how to write it correctly, but if I multiply 7O2 by 3, then I should do the same to the other side of the equation to make it 12CO2?

*February 19, 2016*

**Chemistry**

From the same equation as above, how many moles of CO2 are produced by the reaction of 21.0 mole of O2? 21 moles of O2 means that you would need to multiply 7O2 in the quay ion by 3, so 3 x 4CO2= 12CO2?

*February 18, 2016*

**Chemistry**

Using the equation: 2C2H6 + 7O2--> 4CO2 + 6H20 How may moles of 02 are needed to react with 4.0 mol of C2H6? I think the answer is 14, because if you double the C2H6 to make 4.0 mol, then in the equation you will need to double the O2 to 14. Is this correct?

*February 18, 2016*

**math**

x= -13

*February 17, 2016*

**math**

A number plus itself, plus twice itself, plus 4 times itself, is equal to -104. What is the number?

*February 17, 2016*

**math**

A pair of dice is rolled.What is the probability that the sum of the pips is either an even number on a multiple of 3? total number of space is 36.

*February 4, 2016*

**Math**

An enclosed rectangular garden is 6 meters by 15 meters. Additional fencing within the garden can divide it into three smaller plots, two of them square and one rectangular. What is the least number of meters of additional fencing that is needed?

*January 28, 2016*

**Algebra**

Tell whether the lines for each pair of equations are parallel perpendicular of neither y=-3x+7 -2x+6y=3 Tell whether the lines for each pair of equations are parallel perpendicular of neither y=(-1/5)x=6 -2x+10y=5

*January 18, 2016*

**Algebra (Urgent)**

There should be three answers:) Thanks for your help LadyPhantomhive

*January 18, 2016*

**Algebra (Urgent)**

Which of the following lines are perpendicular to the line y=-1/4x+6 (you may choose more than one answer) 4x-y=2 y=4x 4x+y=6 1/4x-y=6 -4x+y=3

*January 18, 2016*

**Physics **

Three positive point charges are located at the corners of a rectangle. Find the electric field at the fourth corner if q1 = 5 nC, q2 = 6 nC, and q3 = 7 nC. The distances are d1 = 0.6 m and d2 = 0.2 m. (Let the positive x-direction be to the right, and the positive y-direction...

*January 18, 2016*

**Physics**

In the bloodstream, an erythrocyte (red blood cell) of mass m moves with velocity v to the right. Ir collides head-on with a leukocyte (white blood cell) of twice its mass moving to the left with three times its speed. After the collision, the became stuck together. What would...

*December 14, 2015*

**Physics**

A spring with k=1400N/m is firmly anchored to the bottom of a swimming pool. A diver in full SCUBA gear with total mass of 100kg and density of 0.65g/cm3 holds on to the top of the spring. The system reaches a new static equilibrium. After the print is elongated by a length ...

*December 14, 2015*

**Physics**

Imagine a horizontal spring with an elastic constant of 26.5 N/m, held in place just above an air table. If a 2.00 kg mass traveling at 1.50 m/s slams axially into the end of the spring, by how much will it be compressed in bringing the mass to rest?

*November 17, 2015*

**Science**

25.6g

*November 11, 2015*

**Introduction to computers**

You call the help desk to report a problem you are having on your computer. The technician asks you what operation system you are running. You know it is windows 7 but you forgot which version . How can you find out.

*November 10, 2015*

**Introduction to computers**

Which Microsoft operating system started the process of authenticating users with a username and password

*November 10, 2015*

**Introduction to computers**

The command prompt found on Windows 7 and Windows 8 is very similar to the interface of what past operation system.

*November 10, 2015*

**Chemistry **

Is nickel 2 chloride an anion or cation ?? Is sodium chloride an anion or cation ?

*October 25, 2015*

**physics 11**

A swimmer swims perpendicular to the bank of a 20.0 m wide river at a velocity of 1.3 m/s. Suppose the river has a current of 2.7 m/s [W]. (a) How long does it take the swimmer to reach the other shore? (b) How far downstream does the swimmer land from his intended location?

*October 20, 2015*

**math**

From cape to home is 500km I drive from Home at a 100km/h how long will it take in hours

*October 20, 2015*

**Algebra 2 **

Solve the following sequence systems algebraic ally x+2y=17 x-y=2

*October 13, 2015*

**Algebra 2**

Create an explicit equation for each recursively defined sequence below a1=17,an+1=an-7

*October 13, 2015*

**Algebra 2**

x-3/x=3/5

*October 13, 2015*

**physics**

While John is traveling along a straight interstate highway, he notices that the mile marker reads 256 km. John travels until he reaches the 144 km marker and then retraces his path to the 173 km marker. What is John’s resultant displacement from the 256 km marker? How ...

*October 13, 2015*

**Algebra 2**

Solve each system 3x-9y=3 and 2x=16-y

*October 11, 2015*

**Algebra 2**

Solve each system 6x-2y=10 and 3x-2=y

*October 11, 2015*

**Algebra 2**

For the function f(x)=square root 3x-2 find the value of the expression below. What value of x makes f(x)=6

*October 11, 2015*

**Kitondo boys**

A triangle has vertices X(2,2) ,Y(4,2)and Z(3,4).The triangle is enlarged by a scale factor 2 through the origin.What are the coordinates of the image?

*September 28, 2015*

**Physics**

Basically... distance is 4 km Takes 4 min to go down river Takes 6 min to come up How fast is the river?

*September 22, 2015*

**Statistics/probability **

You are considering two mutual funds for your investment. The possible returns for the funds are dependent on the state of the economy and are given in the accompanying table. State of the Economy Fund A Fund B Good 20% 40% Fair 10% 20% Poor -10% -40% You believe that the ...

*September 13, 2015*

**Physics-Trajectory **

A particle's trajectory is described by x =(12t3−2t2)m and y =(12t2−2t)m, where t is in s. What is the particle's speed at t=0s ? What is the particle's speed at t=5.0s ? Express your answer using two significant figures. What is the particle's ...

*September 11, 2015*

**Physics **

Three forces are exerted on an object placed on a tilted floor. Forces are vectors. The three forces are directed as shown in the figure. If the forces have magnitudes F1 = 2.0 N, F2 = 17.0 N and F3 = 15.0 N, where N is the standard unit of force, what is the component of the ...

*September 11, 2015*

**Physics**

The components of vector A⃗ are Ax = + 3.90 and Ay = -4.00. What is the angle measured counterclockwise from the +x-axis to vector A⃗ ?

*September 11, 2015*

**Physics-VECTORS**

Find the vector's magnitude and direction. Part A A⃗ = 4 i^− 8 j^ A =? θA =?

*September 11, 2015*

**Physics **

A rocket-powered hockey puck moves on a horizontal frictionless table. The figure below shows the graphs of vx and vy, the x- and y-components of the puck’s velocity. The puck starts at the origin. The graph of the X-velocity is v=8t cm/s and the Y-velocity is V=30cm/s ...

*September 11, 2015*

**Chemistry**

a) Biphenyl, C12H10, is a nonvolatile, nonionizing solute that is soluble in benzene, C6H6. At 25 degrees Celcius, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 13.8 g of biphenyl in 32 g of benzene? b) Express...

*August 29, 2015*

**Math**

Interval it exists on: (5-x)y"+3xy'-y=1 y(0)=2

*August 8, 2015*

**english**

How can animated jungle animals, sea creatures, fairies, cars and other non-human characters can be used to represent race?

*August 3, 2015*

**biology**

lymphocyte

*July 9, 2015*

**nutrition**

Which of the following is one of the ways that the endocrine system interacts with the digestive system? a) Eliminates wastes generated in the body b) Transports nutrient to cells c) Controls the passage of food in the blood stream d) Secretes hormones that regulate how much ...

*July 9, 2015*

**nutrition**

Which is the best way to balance your dietary choices? a) If you overeat at lunch, you should skip dinner. b) If you eat two slices of pizza at lunch, you should walk an extra mile after dinner. c) If your dinner has no vegetables, you should eat a cereal containing fiber at ...

*July 9, 2015*

**nutrition**

I say it is D

*July 8, 2015*

**nutrition**

Which is the best way to balance your dietary choices? a) If you overeat at lunch, you should skip dinner. b) If you eat two slices of pizza at lunch, you should walk an extra mile after dinner. c) If your dinner has no vegetables, you should eat a cereal containing fiber at ...

*July 8, 2015*

**nutrition**

Which of the following is one of the ways that the endocrine system interacts with the digestive system? a) Eliminates wastes generated in the body b) Transports nutrient to cells c) Controls the passage of food in the blood stream d) Secretes hormones that regulate how much ...

*July 8, 2015*

**Math**

there is a swimming pool, 3 meters in width and 4 meters in length. the owner wants to built a uniform deck around the swimming pool which is 3 times of the area of the pool. what's the width of the deck?

*June 16, 2015*

**Differentail Equations**

I cant figure out how to do this type of problem! Consider the first order differential equation y′+(x/(x^2−4))y=(e^x)/(x−9) For each of the initial conditions below, determine the largest interval a<x<b on which the existence and uniqueness theorem for...

*June 6, 2015*

**History **

How did the success of the civil rights movement and abolishment of slavery open doors to the election of the first Black American President of the United States, Barack Obama? Can I have some examples?

*June 3, 2015*

**Physics**

A massive steel cable drags a 20kg block across a horizontal, frictionless surface. A 100N force applied to the cable causes the block to reach a speed of 4.2m/s in a distance of 2.1m . What is the mass of the cable?

*May 30, 2015*

**english**

Cuba is one of the few remaining communist countries in the world. Since the collapse of the Soviet Bloc in 1990, however, the country has promoted capitalism in the form of tourism in order to stimulate the economy.

*April 28, 2015*

**pre - CALCULUS**

the solution would be: ( det 8 1 det 2 8 24 3 6 24 _____ ______ det 2 1 2 1 6 3 , 6 3 ) which is (0/0, 0/0) The zero in the denominator indicates that the system can not be solved using cramer's rule and is therefore not consistent and independent. I have not read this but...

*April 11, 2015*

**math**

a swimming pool has an area of 40 square metres and a perimeter of 26 metres what is the length and width of the swimming pool and is it possible for a pool to have the same area but a larger perimeter?

*April 11, 2015*

**geometry**

Given: AC perpendicular BD and AB congruent CB. Prove AD congruent CD. It is a kite figure. I need statements and reasons. Problem states Plan: prove triangle ABE congruent CBE. The use congruent corresponding parts AE and CE to show right triangle AED congruent CED. AD and CD...

*April 10, 2015*

**Math**

Yes because the point where the 2 lines meet to make a angle is the end point of a ray and an angle can go forever.

*April 8, 2015*

**geometry**

if m<1 = 60 degrees, then m<3 + m<5 = what? | \2| 1 \| 3 ------- | ------ 6 |\ 4 |5\ | what is the transitive property of angle congruence?

*April 6, 2015*

**geometry**

use diagram given: m<XWY = 2x+5, m<YWZ = 5x-79, and m<XWZ = 122 degrees. m<YWZ= what? (x) (y) (w) (z) connect x to w, w to z, w to y Does WY bisect ,XWZ? Please show work. Th u

*April 6, 2015*

**Physicsl**

What is the magnitude of the electric field a distance 3.5mm from an electron?

*April 5, 2015*

**Trigonometry**

1. y = 2(sin(4x - pi/8)) + 1 2. y = 4(sin((2pi/3)x - 2)) - 1 3. y = 4(sin(2x + pi/3)

*April 4, 2015*

**math**

what is 4(y*y)? is it 4y*4y, or can u not distribute, and why?

*April 1, 2015*

**Statistics**

initial dose 291.8529. 25% mark in 5.1 hours

*March 13, 2015*

**science**

What molecule found in the cell membrane serves as a communication molecule as well as involved in active transport?

*March 8, 2015*

**physics**

the work done is by lifting it up so you can use mgh The tricky part here is that you need to consider where the center of gravity is and it would be the center of the log so the COG is lifted half of the total length of the log 100kg x 9.8 N/Kg x 1.65 meters

*March 5, 2015*

**math(5th grade)**

😔😒😅😗😂😌😙😳😳😗😗😗😗😌😗😙😒😚😗😗😙☺☺😀😀😀👨👨👳👨👼&#...

*February 26, 2015*

**math(5th grade)**

Write the number in two other form

*February 26, 2015*

**math**

Isaiah and Andy had a total of 560 trading cards. After Isaiah gave1/9 of cards to Andy they had an equal # of trading cards. How many more cards did isiah have than Andy at the beginning?

*February 22, 2015*

**math**

Oh, thanks!

*February 17, 2015*

**math**

In terms of set notation.

*February 17, 2015*

**math**

I'm looking for the symbol ', and can you send me the link to it

*February 17, 2015*

**math**

Thanks, but there is no definition for the symbol '

*February 17, 2015*

**math **

I'm doing my math hw, what does the sign ' mean for sets? Thanks

*February 17, 2015*

**Math**

I dont no

*December 18, 2014*

**Calculus Please Help**

Can you please explain these two questions to me? Suppose the population size of a predator is given by P (x) = 0.006x2 + 0.005x, where x represents the population of its prey. If the population of the prey is 10,000 at the first of January and is reduced to 6,000 by May 1 of ...

*December 5, 2014*

**Math**

Nell made a pizza. she cut the pizza into fourths. then she cut each fourth. nell and her friens ate 6 of the smaller pieces of the pizza. What fraction of the pizza did Nell and her friends eat? What fraction of the pizza did Nell and friends Not eat?

*December 4, 2014*

**physics**

A roller coaster cart of mass m = 201 kg starts stationary at point A, where h1 = 27.7 m and a while later is at B, where h2 = 7.1 m. The acceleration of gravity is 9.8 m/s 2. What is the potential energy of the cart relative to the ground at A? Answer in units of J. (201*27.7...

*November 16, 2014*

**IBMY History 7**

What can we learn from the crusades?

*November 11, 2014*

**East and Southeast Asian**

D A C A B B B D A C C D A C

*November 7, 2014*

**Math help!**

Yes your answer is correct. 9^2 * 12^2 = 225. 225 squared is 15.

*October 30, 2014*

**math**

Katrina is studying the effect of foreign substances on bacteria populations. If she introduces a beneficial substance, such as food, the bacteria population grows. If she introduces a harmful substance, such as a poison, the bacteria population decreases. The function f(x) = ...

*October 30, 2014*

**Math**

I'm sorry but I do not follow. The question asks that (out of two dice) given the first dice is even - In which the first die will therefore be 2,4, or 6 - where 6 is the only option. And so what is the probability that the sum of the two dice will equal 12 given the first...

*October 20, 2014*

**Math**

If the first dice yields an even number, what is the probability that the sum of the two dices will be equal to 12? 1st Die P(even) = 3/6 = 0.50 P(6|even) = 1/3 = 0.333 2nd Die P(6) = 1/6 = .1667 So P(12) = 0.33*0.1667 ?

*October 20, 2014*

**Computer programming**

How to build a simple game in java that will allow a player to attempt to guess a randomly generated number between 0 and 10. The player can continue guessing the number until they get it right. The game should be able to do these things: 1. Game should remember each choice ...

*October 6, 2014*

**Chem HELP!!**

Which one of the following sets of quantum numbers can correctly represent a 3p orbital? a) (n = 3 l = 1, ml = 2) b)(n = 1, l = 3, ml = 3) c) (n = 3, l = 2, ml = 1) d) (n = 3, l = 1, ml = -1) e) (n = 3, l = 0, ml = 1)

*October 5, 2014*

**Math**

You have just isolated a new radioactive element. If you can determine its half-life, you will win the Nobel Prize in physic. You purify a sample of 2 grams.One of you colleges steals half of it, and 3 days later you find that 0.1 grams of the radioactive material is still ...

*September 16, 2014*

**PHI 208 Week 3 Readings Quiz**

Which one of these is not a principle that can be drawn from the Categorical Imperative? Act as if the maxim of your action were to become by your will a universal law. Act that you use humanity, whether in your own person or in the person of another, always at the same time ...

*September 14, 2014*

**algebra 2**

Let x = hourly wage 40x + 5(1.5x) = 475 40x + 7.5x = 475 47.5x = 475 x = $10/hour

*August 24, 2014*

**Calculus**

What is the derivative of 3sin(4x)? I have no idea where to begin!!!

*August 24, 2014*

**algebra**

(angle 1) + (angle 2) + (angle 3) = 180 Let's make an angle Q = (angle 1) + (angle 2). SO... Q + (angle 3) = 180 AND (angle 3) = Q - 45. SO... Q + (Q - 45) = 180 2Q = 225 Q = 112.5 Going back to the equation Q + (angle 3) = 180 or by rearranging it: (angle 3) = 180 - Q, if...

*August 24, 2014*

**Algebra**

thanks for the help!

*August 22, 2014*