Monday

January 23, 2017
Total # Posts: 727

**physics**

When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 869 N and the drag force has a magnitude of 1096 N. ...

*January 5, 2017*

**physics**

Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 84 kg, and the mass of the woman is 49 kg. The woman pushes on the man with a force of 58 N due east. Determine ...

*January 5, 2017*

**physics**

In a quarter-mile drag race, two cars start simultaneously from rest, and each accelerates at a constant rate until it either reaches its maximum speed or crosses the finish line. Car A has an acceleration of 11.0 m/s2 and a maximum speed of 110 m/s. Car B has an acceleration ...

*January 5, 2017*

**math**

Only two forces act on an object (mass=3.19 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.

*January 5, 2017*

**physics**

An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +7.62 x 105 m/s to a final velocity of 2.56 x 106 m/s while traveling a distance of ...

*January 5, 2017*

**College Physics**

Two forces and are applied to an object whose mass is 5.75 kg. The larger force is . When both forces point due east, the object's acceleration has a magnitude of 0.979 m/s2. However, when points due east and &...

*January 5, 2017*

**math**

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 7.9-kg projectile from rest to a speed of 2.8 × 103 m/s. The net force accelerating the projectile is 6.7...

*January 5, 2017*

**History**

Peoples diets in Europe consisted mainly of bland bread and potatoes.

*January 5, 2017*

**math**

A person in a kayak starts paddling, and it accelerates from 0 to 0.614 m/s in a distance of 0.372 m. If the combined mass of the person and the kayak is 61.0 kg, what is the magnitude of the net force acting on the kayak?

*January 5, 2017*

**Math**

In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 46.6 m/s in a time of 6.82 s. The mass of the car and riders is 6.72 × 103 kg. Find the average net force exerted on ...

*January 4, 2017*

**RATIOS AND RATES**

At a local grocery store, Sabrina spends $3.96 for 2 pounds of blueberries. How much can she expect to pay for 6 pounds of blueberries?

*January 3, 2017*

**math**

Given that the roots of the equation 3x^2+x+2=0 are a and b, show that 27a^4=11a+10.

*December 30, 2016*

**Physics**

what metal is it if, it is 7.14g/mL => Cast Iron.

*December 28, 2016*

**Calculus applications**

6. The bending moment (M) along a beam is M = WLx/2 -Wx2/2 kNm where x is the distance of a beam length L from the left hand end. W is the weight per unit length. (a) Shear force is calculated as the differential of bending moment. Find an expression for shear force and ...

*December 5, 2016*

**history knowledge**

I just want to know this for fun because I saw it and one of my history books and want to learn about it. Why did Alexander the Greats empire fall?

*December 3, 2016*

**Calculus applications**

A steel factory wishes to make a cylindrical container, of thin metal, to hold 100cm³, using the least possible area of metal. If the outside surface is S cm² and the radius is r cm, show that S = 2?r² + 200r-1 and hence find the required radius and height for ...

*November 24, 2016*

**Algebra**

Please help!! x^2+y^2+6y+5=0 x^2+y^2-2x-8=0

*November 17, 2016*

**Physics**

A typical candy bar contains 300 kilo-calories of energy. if all the energy released by eating the candy bar could be used to do work in lifting a 1000 kg car, how high could it be lifted?

*November 10, 2016*

**brain drain**

pets e.g dogs

*November 4, 2016*

**math**

Tom used 5/8 yard of ribbon to tie weights on the tail of his kite. He cut the length of ribbon in equal pieces that were 1/12 yard long. How many pieces, each 1/12 yard long did Tom cut from the 5/8 yard ribbon?

*October 28, 2016*

**Math**

Three-dimensional tic-tac-toe can be played on three arrays of 3x3 lattice points. To win, three points in a line must be chosen. Examples of such lines are ABC, ADE, AFG, AHI, FHJ. How many different lines can be found?

*October 21, 2016*

**Public speaking**

B. Clapping

*October 13, 2016*

**Public speaking**

Nonverbal communication includes A.posture B.clapping C.eye contact D.all of the above

*October 13, 2016*

**physics**

which ball has more energy a 5 kg ball rolling at 4 m/s or a 6 kg ball rolling at 3 m/s?

*October 7, 2016*

**math**

i) P(X < 6200) P(Z < 6200-6300/400) P(Z < - 0.25) = 0.4013 The probably of sales being less than 6200L is 40.13% ii) Question is not complete, so I cannot answer it.

*September 25, 2016*

**Math**

Distance = Square Root ((x2-x1)^2 +(y2-y1)^2) Square Root ((2-(-1))^2 + (4-0)^2) Square Root ((2+1)^2 + (4)^2 Square Root ((3)^2 + 16) Square Root (9+16) Square Root (25) = 5

*September 25, 2016*

**Math**

All students in Peter's class have $1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combinations of coins are included. What is the probability that Peter is unable to give his friend Jenny ...

*September 21, 2016*

**Math**

All students in Peter's class have $1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combination of coins are included. What is the probability that Peter is unable to give his friend Jenny change...

*September 21, 2016*

**Math 6th grade**

$500 = 3 clients $22,000 = x clients 500x = 66,000 x = 132 Tony needs 132 new clients

*September 20, 2016*

**English**

soil

*September 15, 2016*

**Calculus**

tan(θ) = y/x = 5/12 Find r r^2 = x^2 +y^2 = 12^2 + 5^2 = 144 + 25 r = Square Root (169) r = 13 sin(θ) = y/r = 5/13

*August 28, 2016*

**U.S. Government and Politics**

Which statement best describes the significance of the Magna Carta?

*August 15, 2016*

**science**

What is the molarity of a solution of sodium chloride which contains 0.5moles in 200cubic centimeters? #2.what volume of 1m solution of hcl will contain 10moles?

*August 2, 2016*

**physics**

a helium atom is in one of its single states.one of the electrons is in an p-state and the other a D-sate.the atom is placed in a magnetic field,B,of strengh 3 tesla. sketch a diagram showing the degenerated states and all permissible transition from D-state b)Determine by how...

*April 27, 2016*

**Science**

0.9866 g

*April 26, 2016*

**Hamlet**

How does Hamlet show his Heroism?

*April 17, 2016*

**math**

70/800 8.75%

*March 17, 2016*

**math**

70/800

*March 17, 2016*

**math**

in an experiment, it was found that 70 out of 800 animals were happy in their surroundings. a find probability that an individual animal is happy in their surroundings. b. represent as a percent

*March 17, 2016*

**math**

second half is if both marbles are green

*March 17, 2016*

**math**

a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then draw from the jar. find the probabilty that both marbles are green

*March 17, 2016*

**math**

4 red marbles, 3 green, 2 yellow. you pick 2 at random.What is probability of a. 1 yellow & 1 red b. 2 green

*March 17, 2016*

**math**

a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then drawn from ther jar. find the probabilty that the first marble is red & second is green

*March 17, 2016*

**Descriptive Physics**

You are standing 5 feet from one speaker and 14 feet from another. Both speakers are producing the same sound. If the combined sound from both speakers is especially loud at your location, which of the following could be the wavelength of the sound? Choose all that apply. 1 ...

*March 13, 2016*

**math**

I am a number less than 3,000.When you divide me by 32, my remainder is 30. When you divide me by 58, my remainder is 44. What number am I.

*January 13, 2016*

**physics**

Pure helium is closed into cylinder with a movable piston. The initial volume, pressure, and temperature of the gas are 15 dm3, 2·105 Pa, and 300 K, respectively. If volume is decreased to 12 dm3 and the pressure increase to 3.5·105 Pa find the final temperature of ...

*January 11, 2016*

**physics**

A police car siren emits a sound wave with a frequency fs = 400 Hz and it is moving toward the wall at 25 /m/s. What frequency reflected from the wall does the driver of the police car hear ? The speed of sound is 340 m/s.

*January 11, 2016*

**math**

Dee used 2 1/3 cups of sugar for a cake recipe.If the amount of sugar the container holds is 3 times the amount she used,does the container hold more than,less than,or equal to 3 cups of sugar

*December 3, 2015*

**math**

Derek ran 3/8 of a race he had to stop for a break.If the race is 6 miles long,did Derek run more than,less than,or equal to 6 miles before he took a break?

*December 3, 2015*

**math**

Maresol spent 4/5 of her allowance on a pair of jeans.If she received $15 for allowance,did Maresol spend more than,less than,or equal to $15 on the jeans?

*December 3, 2015*

**Physics**

A ball with a mass of 4 kg and a velocity of 10 m/s strikes an 8kg ball that is initially at rest. If the collision is perfectly elastic, what are the velocities of the 4 kg and 8 kg ball after the collision?

*December 2, 2015*

**math 5 grade**

1: it is saying, six people are sleeping, to find total it is 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2. and your answer came out to be 51. TRUE :) 2: 6 1/2 * 1 1/2 is 13/2 * 3/2 which is 39/4! this is really 9 3/4 WHICH IS NOT 10! Oliva is wrong! hahaha! so that is your ...

*December 2, 2015*

**math**

maresol spent 4/5 of her allowance on a pair of jeans.if she received $15 for allowance,did maresol spend more than,less than,or equal to 3 cups of sugars?explain

*December 2, 2015*

**Chemestry**

2Fe + 3O2 --> 2Fe2O3

*December 2, 2015*

**Biology: Genetics**

that's true, also nucleotides affect DNA in deciding what it codes for; therefore it is affecting structure in general.

*December 2, 2015*

**Math**

A train leaves San Diego at 1:00 PM. A second train leaves the same city in the same direction at 4:00 PM. The second train travels 78 mph faster than the first. If the second train overtakes the first at 6:00 PM, what is the speed of each of the two trains?

*December 2, 2015*

**Vani school**

1 whole pizza, also quick grammar lesson, of each pizza* <3

*December 2, 2015*

**Geometry**

6/30 proportion of his height to where he is standing x/45 what we don't know and the distance of the flag pole 6/30=1/5 simplifying x/45 1/5=x/45 setting them equal x=9 if we sole we will get this For further help/ understanding draw the picture and see how these ...

*December 1, 2015*

**Language arts**

what about the Essay??

*December 1, 2015*

**Algebra**

a farmer fences off a small.rectangular plot of land thay is 60 feet by 100 feet. within that area, a garden is planted and surrounded by a walkway of uniform width. how wide is the walkway if the area of the planted area is one half of the area of the plot?

*December 1, 2015*

**math**

How can x-8 be modeled by being described as a situation? Answer:8x

*November 11, 2015*

**Finance**

Problem 10-32 Project Evaluation [LO1] Aria Acoustics, Inc. (AAI), projects unit sales for a new seven-octave voice emulation implant as follows: Year Unit Sales 1 86,000 2 99,000 3 113,000 4 108,000 5 89,000 Production of the implants will require $1,650,000 in net working ...

*November 7, 2015*

**U.S. History (Check)**

good job

*October 13, 2015*

**Math**

A bag contains 5 red, 7 yellow, 8 green, and 3 blue markers. What is the p(two green markers) will be chosen if the markers are not replaced as they are chosen?

*September 1, 2015*

**calculus**

A snowball is melting at the rate of 2 inches per hour. How fast is the surface area of the snowball changing at the instant the snowball has a radius of 3 inches i tried (d/dt) = 4pir^2 (dr/dt) its multiple choice and -72pi isnt there so im just trying to figure this out

*August 28, 2015*

**Physics**

Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? A.Increasing the distance to the screen. B.Increasing the number of lines per length. C.Decreasing the number of lines per length. D.Decreasing the ...

*August 11, 2015*

**BUSINESS STUDIES**

Q1.With the aid of a diagram discuss the marketing systems Q2.Discuss the problems that occur when universities and industry form joint ventures for research purposes.How have these problems been solved?

*July 8, 2015*

**probability**

E[T]=9

*May 16, 2015*

**chemistry**

under what conditions could the decomposition of Ag2O(s) into Ag(s) and O2(g) proceed spontaneously at 298 K? 2Ag2O(s)---->4Ag(s)+O2(g) dG=22.42 Kj answer= 0.000118 atm.

*May 9, 2015*

**chemistry**

dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...

*May 9, 2015*

**college chemistry**

at its melting point, O c, the enthalpy of fusion of water is 1.435 kcal/mol. what is the molar entropy change for the melting ice at 0C? answer: 5.26 cal/mol-k

*May 9, 2015*

**college chemistry**

thanks

*May 9, 2015*

**college chemistry**

for the reaction at 298 K 2A+b ---->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K

*May 9, 2015*

**college chemistry**

im confused i found those as the standard enthalpies and entropies for pcl3? i cant get answer

*May 9, 2015*

**college chemistry**

is it 306.4/33.2?

*May 9, 2015*

**college chemistry**

what is dHvap?

*May 9, 2015*

**college chemistry**

estimate the normal boiling point of Pcl3 answer: 333 K how do you get it?

*May 9, 2015*

**LA**

I need help too

*May 7, 2015*

**Chemistry**

Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...

*April 19, 2015*

**Chemistry**

4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...

*April 18, 2015*

**Physics**

A 1100- kg car collides with a 1400- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 25 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...

*April 16, 2015*

**GEOMETRY**

cASEY SIGHTS THE TOP OF AN 84 FOOT TALL LIGHTHOUSE AT AN ANGLE OF ELEVATION OF 58 DEGREE. IF CASEY IS 6 FEET TALL, HOW FAR IS HE STANDING FROM THE BASE OF THE LIGHTHOUSE. I DO NOT UNDERSTAND WHAT IS ANGLE OF ELEVATION CAN YOU SHOW ME AN EXAMPLE PLEASE THANK YOU.

*April 12, 2015*

**Earth Science**

You doing this? pkwy.k12.mo.us/homepage/skang/file/Astronomy%20Review.pdf From here the answer would be C - Full moon.

*April 9, 2015*

**Math**

Volume of cube = 1ml How many ml in 1.5L?

*April 9, 2015*

**science**

Compare today's temperature of the universe to the temperature of the universe right after the big bang. That will give you your answer.

*April 9, 2015*

**science**

The average temperature of the universe today is approximately 2.73 kelvins (−270.42 °C; −454.76 °F), based on measurements of cosmic microwave background radiation. What was it like back then?

*April 9, 2015*

**science**

I'm sorry but please reread the article. We even quoted the answers for you but you don't want to put any effort into reading them and trying to figure out what the quotes are saying. You want the answer to be handed you.

*April 9, 2015*

**science**

Thank you Ms. Sue

*April 9, 2015*

**science**

2 - 3 paragraphs down it says... "For the first 380,000 years or so, the universe was essentially too hot for light to shine, according to France's National Center of Space Research " Miss that too?

*April 9, 2015*

**science**

You obvously didn't read it. The very first sentence in that post the Ms. Sue posted is "The universe was born with the Big Bang as an unimaginably hot, dense point." ... how did you miss that??

*April 9, 2015*

**math**

As Ms. Sue mentioned you posting under many names today. Instead of asking questions, why not try to help others or even at least do some work on your questions instead of guessing. I don't mean to be rude here.

*April 9, 2015*

**math**

Wrong. Its B The office building is designed with n floors and each floor is 3.9m right so you have right now: 3.9n On top of entire office building is a antenna which is 15.85m tall so its 3.9n + 15.85 = h

*April 9, 2015*

**Math**

Yes, your answer is A as mentioned by Steve

*April 9, 2015*

**Calculus**

Thank you so much!

*April 9, 2015*

**Calculus**

Suppose that y=f(x) = sqrt(2x), x>=0 Find a c > 0 such that the tangent line to the curve y = f(x) at x = c has the same slope as the tangent line to the curve y = f^–1(x) at x = c. You get: c = 1/8 c = 1/2 c = (1/8)^(1/3) c = (1/3)^(2/3) c = (1/2)^(1/3)

*April 9, 2015*

**math**

coin = 1/2 Cube has number 1, 2, 3, 4, 5, and 6 so 2, 4, 6 are even numbers which is 1/2 of the cube So 1/2*1/2 = 1/4

*April 9, 2015*

**Calc AB**

Thank you. I was taking the inverse of (x+3)^3 + 2 and then I got stuck after that.

*April 9, 2015*

**Calc AB**

Let f(x) = (x+3)^3 + 2. The graph of the inverse function y = f^–1(x) has a vertical tangent at: (Hint: Think about the symmetry of the 2 graphs.) (66, 1) (2, –3) (10, –1) (–3, 2) (–1, 10)

*April 9, 2015*

**Math**

Got this one. Its 1/24 correct?

*April 9, 2015*