Wednesday

October 1, 2014

October 1, 2014

Total # Posts: 1,136

**history**

What caused the rapid population growth of homo sapiens
*September 13, 2012*

**math**

x^2=8x-9 solve by completing the square to obtain exact solutions
*September 12, 2012*

**Physics**

Three men are trying to move a wardrobe. One pushes northward with a force of 100N; the second pushes eastward with a force of 173N; the third pushes in a direction 60 degrees west of south with a force of 200N. What is the resultant force on the wardrobe and it's direction?
*September 11, 2012*

**Chemistry**

In solution, hypochlorite ion is known to decompose with a second-order rate law. If [ClO-]0 = 0.0570 M and k = 2.06x10-4 M-1·min-1, calculate the half-life for this reaction 2ClO- 2Cl- + O2.
*September 6, 2012*

**Chemistry**

Calculate the temperature at which k = 2.0 s-1 if k = 10.0 s-1 at 371 K. The activation energy for the reaction is 30.0 kJ mol-1.
*September 6, 2012*

**math**

if the weight of a fish varies jointly as the length and the square of the girth, and if a fish 11 inches long with a girth of 7 inches weighs 0.7lbs, find the weight of a fish 23 inches long with a girth of 18 inches.
*September 5, 2012*

**math**

if Y varies jointly as X and the square of Z, and if Y=24 when X=2 and Z=6, find Y when X=10 and Z=9
*September 5, 2012*

**algebra**

an airplane is flying at an altitude of 3200 feet. an air- traffic controller in the tower keeps constant track of the planes distance from the tower in X feet. express the horizontal distance from the tower to a point directly below the airplane,d, in terms of X.
*September 5, 2012*

**algebra**

a rancher has 310 feet of fencing with which to enclose two rectangular corrals, both of the same size. the two corrals will share one side, and a barn forms one side of both corrals. suppose the width of each corral is X feet. express the total area of the two corrals as a ...
*September 5, 2012*

**math**

a farmer has 200 yards of fencing to enclose three sides of a rectangular piece of property that lies next to a river. the river will serve as the fourth side. find the dimensions of property if the area is 3200 yards^2
*September 5, 2012*

**Geometry **

Angle ABC and ange DBE are vertical angles,the measure of angle ABC =3x+20, and the measure or angle DBE =4x-10. Write and solve an equation to find the measure of angle ABC and the measure of angle DBEin
*September 2, 2012*

**Geometry **

Angle ABC and ange DBE are vertical angles,the measure of angle ABC =3x+20, and the measure or angle DBE =4x-10. Write and solve an equation to find the measure of angle ABC and the measure of angle DBEin
*September 2, 2012*

** college math**

prove f(x)= x^15+6 is increasing on the interval: I= (-‡,‡)
*September 1, 2012*

**math**

How fast would a ball have to be thrown upward to reach a maximum height of 49 ft? [Hint: Use the discriminant of the equation 16t2 − v0t + h = 0.]
*September 1, 2012*

**English**

For this quote 'their intercourse had been one continued series of opposition. Their opinions clashed; and indeed, she had never perceived that he had cared for her opinions, as belonging to her, the individual', can someone find a technique in it? It's a good ...
*August 31, 2012*

**HEALTH**

Correct
*August 22, 2012*

**health**

Yes, B is correct
*August 13, 2012*

**health**

It is D
*August 11, 2012*

**Science**

Which of the following is a vector quantity? speed weight distance traveled mechanical energy Which of the following is a scalar quantity? work velocity acceleration displacement
*August 8, 2012*

**stats**

If 95% of all people between 21 and 50 have had at least one adult beverage in their life, find these probabilities for a sample of 10 people in that age group: a) Exactly 10 have had an adult beverage b) At least 6 have had an adult beverage c) At most 8 have had an adult ...
*August 4, 2012*

**math**

I need a lot of help on multiplication and division.Will you help me?
*July 31, 2012*

**Science 10**

The symbol of the lead(IV) ion is ?
*July 26, 2012*

**trig HELP**

A barn is 30ft. wide by 60ft long; the rafters make an angle of 40degrees with the horizontal. Find the area of each of the two gable ends and the area of the roof. Please Include Solution And If Possible An Illustration. Thank You In Advance :)
*July 5, 2012*

**trig**

Find the radius of a circle which a 59-foot chord subtends an angle of 12degrees at the center. I Just Want To See The Illustration. I Can Handle The Rest. Thank You In Advance =)
*July 3, 2012*

**Algebra**

Given f(x) = radical x-2 and g(x) = x2 – x – 6. Find (g o f)(6). A. -4 B. 2 C. 24 D. 26 E. 48
*July 1, 2012*

**Algebra**

Given f(x) = radical x-2 and g(x) = x2 – x – 6. Find (f – g)(6). A. -26 B. 26 C. -22 D. 22 E. 2
*July 1, 2012*

**Trigonometry**

A person on a ship sailing due south at the rate of 15 miles an hour observes a lighthouse due west at 3p.m. At 5p.m. the lighthouse is 52degrees west of north. How far from the lighthouse was the ship at a)3p.m.? b)5p.m.? c)4p.m.? Please Show The Solution So That I Can Study...
*June 23, 2012*

**math foundations 20**

a right hexagonal prism is enlarged by a scale factor of 5.7 a)determine the value of volume of large prism/volume of small prism. do not round answer.. how do i figure this out?
*June 20, 2012*

**Math**

The horizontal range, R, is modeled by this formula: R(x)=(v^2*sin2(x))/32 The initial velocity (v) is 90ft per second. The ball is pitched at an angle of x degrees with the horizontal. When x=26 degrees, the ball travels 200ft. At what other value of x will the ball travel ...
*June 16, 2012*

**Geometry**

Two forces are pushing on an object, one at 12 lbs of Force and one at 5.66 lbs of Force. The angle between them is 35° (each is 72.5 from horizontal, such that the forces make a v with the object in the center). 17. What is the total Force on the object? 18. What is the ...
*June 5, 2012*

**Geometry**

A plane is is flying 225 mph heading S25°W. The wind is blowing S80°E at 60 mph. 11. What is the bearing of the plane? 12. What is the smallest angle of the triangle? 13. What is the largest angle of the triangle? 14. What is the remaining angle of the triangle? 15. ...
*June 5, 2012*

**Geometry**

A plane is is flying 240 mph heading N60°E. The wind is blowing S30°E at 30 mph. 6. What is ground speed of the plane? 7. What is the smallest angle in the triangle? 8. What is the biggest angle in the triangle? 9. What is the remaining angle in the triangle? 10. What ...
*June 5, 2012*

**Geometry**

A plane is heading west at 200 mph. The wind is blowing S30°W at 25 mph. 1. What is the ground speed of the plane? 2. When you solve the triangle, what is the smallest angle? 3. What is the largest angle of the triangle? 4. What is the remaining angle? 5. What is the ...
*June 5, 2012*

**Logic**

misinterprets a key term
*June 5, 2012*

**Geometry**

A plane is heading west at 200 mph. The wind is blowing S30°W at 25 mph. 1. What is the ground speed of the plane? 2. When you solve the triangle, what is the smallest angle? 3. What is the largest angle of the triangle? 4. What is the remaining angle? 5. What is the ...
*June 4, 2012*

**chemistry**

Marla drives her car to school each day. If it takes her 12 minutes to drive one way, how many hours a week does Marla spend driving? (Express the answer in decimal form.)
*May 30, 2012*

**chemistry**

What is the specific heat of an unknown substance if 2000 J of energy are required to raise the temperature of 4 grams of the substance 5 degrees Celsius?
*May 30, 2012*

**science**

- thanksss . ^_______^
*May 29, 2012*

**science**

i think its number 4 .
*May 29, 2012*

**science**

2 or 3 >????? -_-
*May 29, 2012*

**science**

the threat of global warming is mainly associated with ? 1 radioactive wastes 2 use of hydroelectric energy 3 burning of fossil fuels 4 thermal pollution of lakes and rivers
*May 29, 2012*

**Geometry**

A plane is heading west at 200 mph. The wind is blowing S30°W at 25 mph. 1. what is the ground speed of the plane? I could not figure this one out. Please help?
*May 21, 2012*

**algebra**

The equation that describes the path of a small rocket after it is shot into the air is h=1120-16t^2, where h is the height above the ground, in feet, after t seconds. How many seconds does it take for the rocket to return to the ground?
*May 19, 2012*

**business**

How does TerraCycle use its size and flexibility to gain a competitive advantage? How has the company extended its product line? How well do the new products fit the company’s strategy and image? Explain. How does TerraCycle’s culture reinforce its focus on innovation?
*May 15, 2012*

**MATH PLS HELP**

A research center claims that 50% of people believe that drivers should be allowed to use cellular phones with hands free devices while driving. In a random sample of 150 U.S. adults 58% say that drivers should be allowed to use cellular phones with hands free devices while ...
*May 11, 2012*

**Statistics**

A research center claims that 50% of people believe that drivers should be allowed to use cellular phones with hands free devices while driving. In a random sample of 150 U.S. adults 58% say that drivers should be allowed to use cellular phones with hands free devices while ...
*May 11, 2012*

**algebra 2**

Classify the conic section . Write its equation in standard form. 4x^2-y+3=0?
*May 3, 2012*

**algebra 2 please check**

Write an equation for a parabola with vertex at (-4 , 3) and focus at ( -4, -2)? I have this.... (X+4)^2=20(y-3)
*May 3, 2012*

**algebra 2 please check**

Identify the line(s) of symmetry for the conic section x-(y-1)^2=2 I have this... (Y-1)^2=(x-2) Vertex (2,1) Symmetry y=1. Is this correct?
*May 3, 2012*

**algebra 2**

Write the equation for a parabola with vertex (-2 , 3) and focus ( -2, 1).
*May 3, 2012*

**algebra**

Identify the line(s) of symmetry for the conic section x-(y-1)^2=2
*May 2, 2012*

**UMA**

Life Direction has three parts: vision, setting goals and a plan of action
*April 29, 2012*

**physics**

On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. This satellite was injected into an orbit 705 {\rm km} above the earth's surface, and we shall assume a circular orbit. How many hours does it take this satellite to make ...
*April 27, 2012*

**Math**

prove the identity: sin^2 O/ 1-cos O = 1+cosO O= theta
*April 27, 2012*

**Physics. PLEASE HELP!!**

How do you calculate the y component. Answer in units of Nm. How do you calculate the z component. Answer in units of Nm.
*April 25, 2012*

**Physics. PLEASE HELP!!**

A force F=Fx ˆi + Fy ˆj + Fz ˆk acts on a particle located at X= (x, y, z). Given Fx=−88.3N, Fy=7.56N, Fz=60N, x= −3.65m, y=1.67m and z=7.03m, calculate the three components of the torque vector ~ = xˆi + y ˆj + z ˆ...
*April 25, 2012*

**Physics. PLEASE HELP!!**

Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic energy of the ...
*April 25, 2012*

**Calc 1**

An 8 foot tall fence seperates Larry's yard from Evan's yard.The fence is 3 feet from Larry's house and runs parallel to the side of his house. Larry wants to paint his house and needs to position a ladder extending from Evan's yard over the fence to his house...
*April 24, 2012*

**Calculus**

A flower pot is dropped from a point 12 feet above the ground,so that it will land 4 feet from the base of a 12 foot lamppost. At what rate is the shodow of the flower pot moving along the ground when the pot is 8 feet above the ground?
*April 24, 2012*

**Physics. PLEASE HELP!!**

A force F=Fx ˆi + Fy ˆj + Fz ˆk acts on a particle located at X= (x, y, z). Given Fx=−88.3N, Fy=7.56N, Fz=60N, x= −3.65m, y=1.67m and z=7.03m, calculate the three components of the torque vector ~ = xˆi + y ˆj + z ˆ...
*April 23, 2012*

**Physics. PLEASE HELP!!**

Two ice skaters hold hands and rotate, making one revolution in 7.6 s. Their masses are 15 kg and 50 kg, and they are separated by 4.6 m. Find the angular momentum of the system about their center of mass. Answer in units of J · s Find the total kinetic energy of the ...
*April 23, 2012*

**writing**

Write a 150- to 200-word paragraph to explain how purpose, audience, tone, and content would impact the following topic: What do you hope to accomplish COM 155? Be sure to use the three components of a good paragraph covered in this week’s readings. In addition, be sure ...
*April 23, 2012*

**Physics. PLEASE HELP!!**

Consider a wheel (solid disk) of radius 0.748 m, mass 16 kg and moment of iner- tia 1/2 MR^2 . The wheel rolls without slipping in a straight line in an uphill direction 27 above the horizontal. The wheel starts at angular speed 20.5882 rad/s but the rotation slows down ...
*April 20, 2012*

**Physics. PLEASE HELP!!**

A uniform disk with a mass of 130 kg and a radius of 1.2 m rotates initially with an angular speed of 950 rev/min. A constant tangential force is applied at a radial distance of 0.5 m. How much work must this force do to stop the wheel? Answer in units of kJ
*April 20, 2012*

**Physics. PLEASE HELP!!**

A 1.2 m diameter wagon wheel consists of a thin rim having a mass of 11 kg and six spokes, each with a mass of 1.1 kg. Find the moment of inertia of the wagon wheel for rotation about its axis. Answer in units of kg · m2
*April 20, 2012*

**sliva**

a solution is made by dissolving 3.95g of NaCl in 78.2 mL what is the concentration of sodium chloride in units of weight/volume percent
*April 16, 2012*

**physics**

The magnitude of a vector is always : - a positive number - greater than 1 - an integer - none of the above.
*April 12, 2012*

**PHYSICS HELP !**

when telling someone how to get to your house from campus, you need to a) give your direction of travel b) give your distance they need to travel c)give both directions and distance d) not enough information
*April 12, 2012*

**Physics. PLEASE HELP!!**

A ball bounces to 45 percent of its original height. What fraction of its mechanical energy is lost each time it bounces? What is the coefficient of restitution of the ball-floor system?
*April 11, 2012*

**Physics. PLEASE HELP!!**

Your answers are incorrect. But thank you for your help. :)
*April 11, 2012*

**Physics. PLEASE HELP!!**

A ball bounces to 45 percent of its original height. What fraction of its mechanical energy is lost each time it bounces? What is the coefficient of restitution of the ball-floor system?
*April 11, 2012*

**health**

It's not c bc I got c wrong on my test
*April 11, 2012*

**Physics. PLEASE HELP!!**

A small car of mass 985 kg is parked behind a small truck of mass 1551 kg on a level road. The brakes of both the car and the truck are off so that they are free to roll with negligible friction. A 83 kg woman sitting on the tailgate of the truck shoves the car away by ...
*April 7, 2012*

**Physics. PLEASE HELP!!**

A 1.3 kg steel ball and 8 m cord of negligi-ble mass make up a simple pendulum that can pivot without friction about the point O. This pendulum is released from rest in a horizontal position and when the ball is at its lowest point it strikes a 1.3 kg block sitting at rest on ...
*April 7, 2012*

**Physics. PLEASE HELP!!**

When a 0.35 kg baseball is hit, its velocitychanges from 21 m/s to -29.5 m/s. What is the magnitude of the impulse de-livered by the bat to the ball? Answer in units of N · s
*April 7, 2012*

**Please Chemistry Help**

can you explain it a little more cuz i really didnt understand anything!!!! thank you!
*April 6, 2012*

**Please Chemistry Help**

for the transition of an electron in a hydrogen atom between the principal quantum number levels 4 and 3, calculate a) the energy released b) the wavelength of the line in the spectra.
*April 6, 2012*

**Trig Help Please!!!**

thank you!!!
*April 5, 2012*

**algebra**

In Chemistry class, Andrew has earned scores of 64, 69, and 73 on three tests. He must maintain an average of 70 to pass the course. What score must Andrew earn on the final exam to pass the course?
*April 5, 2012*

**Physics**

A 6 kg block moves at 5 m/s to the right while a 9.5 kg block moves at 8 m/s to the right. Find the total kinetic energy of the two-block system. Answer in units of J
*March 31, 2012*

**Physics**

Three balls with masses of 4 g, 6 g, and 4 g,respectively, are connected by massless rods. The balls are located (in meter intervals).What is the x-coordinate of the center of mass? Answer in units of m
*March 31, 2012*

**Physics**

if you had two ping pong balls (or golf balls, or tennis balls), both carrying the maximum possible positive electrical charge, and you also had insulating gloves that allowed you to pick them up without being shocked, would you be strong enough to make the charged balls touch...
*March 29, 2012*

**Chemistry Help!!!!!!**

i really need help with this right now!!!!
*March 29, 2012*

**Chemistry Help!!!!!!**

95.65 grams of barium hydroxide were dissolved in 2000ml of water. 88 grams of carbon dioxide were passed through the solution producing a white precipitate. what was this white precipitate and how many grams of it were produced. explain please!!!! i got so confused with this...
*March 29, 2012*

**ALGEBRA**

Perimeter of some traffic signs must be 74 inches.It's length is 11inches longer than it's width. What are the signs dimensions?
*March 28, 2012*

**ALGEBRA**

A non toxic floor wax can be made from lemon juice and linseed oil.The amount of oil should be 2 times the amount of lemon juice. How much of each ingredient is needed to make 30 ounces of floor wax?
*March 28, 2012*

**ALGEBRA**

A hardware supplier manufactures three kinds of clamps, types A, B, and C. Production restrictions force it to make 10 more type C clamps than the total of the other types and twice as many type B clamps as type A clamps. The shop must produce 250 clamps per day. How many of ...
*March 28, 2012*

**ALGEBRA**

The perimeter of a traffic sign must be 128 inches. It's length is 8 inches longer than the width. find the dimensions.
*March 28, 2012*

**ALGEBRA**

SOLVE IN LINEAR EQUATION? A university bookstore recently sold a wirebound graph paper notebook for $1.08, and a college ruled notebook for $3.12.At the start of the spring semester, a combination of 50 of these notebooks were sold for a total of $88.68 .How much of each type ...
*March 28, 2012*

**COLLEGE ALGEBRA**

An investment of $63,000 was made by a business club. The investment was split into three parts and lasted one year. The first part of the investment earned 8% interest, the second 6% and the third 9%. Total interest from the investments was $4950. The interest from the ...
*March 25, 2012*

**COLLEGE ALGEBRA**

An investment of $63,000 was made by a business club. The investment was split into three parts and lasted one year. The first part of the investment earned 8% interest, the second 6% and the third 9%. Total interest from the investments was $4950. The interest from the ...
*March 24, 2012*

**NCSU**

A man of mass 83.5 kg walks down the aisle of an airplane at a speed of 1.60 m/s in the forward direction while the plane moves at a speed of 295 m/s relative to the earth. (a) Find the man's kinetic energy relative to the plane. (b) Find the man's kinetic energy ...
*March 24, 2012*

**math**

Quotient: 47 Divisor:64 Dividend is what?
*March 13, 2012*

**college physics**

THIS IS NO HELP ???
*March 8, 2012*

**college physics**

a 1.0 N-weight is hanging at rest as shown. In each case, write in the magnitude of the unknown force. a) chain with a weight of 2.5 N has a 1.0 N hanging weight b) chain with a weight of .5 N has a 1.0 N hanging weight c) stretched elastic band with negligible weight has a 1....
*March 8, 2012*

**Physics**

What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp?
*March 6, 2012*

**Physics**

Pendulum A is 20 cm long and has a 5 g mass on it. Pendulum B is 30 cm long and has a 10 g mass on it. Which one has a faster period?
*March 1, 2012*

**math**

Write expressions for other five trigonometric ratios for each acute angle: a. csc(theta 0) = a/b b. sec(beta B) = x+1/x-1, x not equal 1
*February 25, 2012*

**Chemistry**

When 3.2 moles of Al react with excess HNO3 at STP, How many liters of H2 are formed
*February 23, 2012*

**Biology Lab**

HOw much Nacl (MW= 58.44g) would you need to ass to a solution if you wanted to make 100 ,mL of 4* 10 to the -3 M NaCl?
*February 22, 2012*

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