Sunday

April 20, 2014

April 20, 2014

Total # Posts: 1,398

**Physics**

It should have read Physics as subject- I mistyped it-Please help me understand this

**Physcis**

An airplane flying at 120km/h due west moves into a region where the wind is blowing at 40km/h due east. If the plane's original vecotr velocity is Vplane, what is the expression for the plane's resulting velocity in terms of Vplane. a. 1/3 >Vplane b. 2/3>Vplane ...

**Chemistry**

A 279 lb fullback runs the 40 yd dash at a speed of 18.5 ± 0.1 mi/h.(a) What is his de broglie wavelength (in meters)?(b)what is the uncertainty of his position?

**Physics**

I have a problem with an atwood's machine problem. i have three tensions where T1 and T2 are on the left and T3 is on the right. Bottom left corner is block 2kg with T1 then another block 2kg with T2 on the left side. On the right side i have a block of 7kg with T3. I am a...

**Physics**

This is what i've done: (i) T3sin 47 = mg (ii) 37 = T3cos 47 so i said T3 = 54.2523 N 54.25(sin47)/g = m m = 3.96776 kg

**Physics**

In the figure below the left hand calbe has a tension T1 and makes an angle of 42 with the horizontal. the right hand calbe as a tension T3 and makes an angle of 47 with the horizontal. The horizontal cable connecting the two masses has a tension of 37 N. Determine the mass M2.

**Algebra **

What is the problem precisely? What is the question?

**Algebra **

I think the question is asking you if the function f(x) equals 8 WHEN x equals 8; true of false? since the function is f(x)= x + 8 the answer is false because 8+10=18

**PHYSICS**

Since average a= delta v/ delta t 340(.05)= delta v v=17 m/s Furthermore this launch velocity has the angle of 51 degrees. You then use your handy dandy trigonometric skills to find the horizontal and vertical components of the launch velocity. 17cos(51)= horizontal find the v...

**math**

if a^2 + b^2 = c^2 *equation for right triangles and c in your case is 32 meters and because the obj. is a squared the sides are equal to each other therefore: 2x^2 = 32^2 x = side of square AREA= x^2 therefore : x^2 = (32^2) / 2

**physics**

You need an initial velocity

**9TH GRADE MATH**

21=5-3=7-9*2=

**Calculus**

gay....

**Anatomy**

If you stand with your arms down at your sides and lift them up to shoulder height is that Adduction or Flexion?

**science**

what is the scientific notation for 280 mm?

**geometry**

Rays PQ and QR are perpindicular. Point S lies on the interior of angle PQR. If m<PQS=4+7a adn m<SQR = 9+4a, find m<PQS and m<SQR

**math**

One year, China consumed 4 times as much energy as Brazil.Define a variable and write an expression for the amount of energy China used that year.I don't get the variable part and expression. Not the same person.

**math**

One year, China consumed 4 times as much energy as Brazil.Define a variable and write an expression for the amount of energy China used that year.I don't get the variable part and expression. Not the same person.

**college**

a rock is dropped off a bridge. How fast is it moving when it hits the water 2.5s later?

**math**

(17-5)(6+5) Do you know what's an expression is? Can you teach me how to do it?

**math**

(17-5)(6+5)

**math**

It means 14 divide by 2

**math**

14/2+3(5)

**math**

so, what's the right problem??????????

**Math**

Dave has quarters, dimes and nickles in his bank. He has 3 more dimes than quarters and 6 less nickles than quarters. There are 63 total coins. How many are quarters?

**8th grade**

what is a root word

**PHYSICS LEC**

please help...i need this immediately.. rolling friction. two bicycles are set rolling with the same initial speed of 3.50m/s on a long, straight road, and the distance each travels before its speed is reduced by half is measured. One tire is inflated to a pressure of 40psi an...

**geometry**

The length of a rectagle is 9 centimeters more than half the width. Find the legth if the perimeter is 60 centimeters.

**chemistry**

What mass of solute is needed to prepare 140 mL of 0.560 M KCl? how do i work this out?

**PHYSICS LAB**

a gold ball is hit with an initial velocity v0 = 53m/s at an angle of 50degrees above the horizontal. a)how high the ball go? b)what is the total time the ball is in the air? c)how far will the ball travel horizontally before it hits the ground?

**physics**

A long, vertical, straight wire carries a current I going upwards. The wire is perpendicular to the plane of a circular metal loop and passes through the center of the loop. The loop is allowed to fall and maintains its orientation with respect to the straight wire while doing...

**physics**

thanks, Bob!

**physics**

A step-down transformer has a turns ratio of 1:10 and its primary is connected across the terminals of a standard 120 V wall socket. A 330 ohm resistor is connected across the secondary of this transformer. What power P is dissipated in the resistor?

**physics**

The primary coil of a transformer is connected to a standard wall socket. A resistance R is connected across hte secondary coil. The resistance across the secondary coil is increased. What happens to the current in the primary coil, and what happens to the power being supplied...

**PHYSICS**

if by some suitable mechanism the falling body had been given an initial downward push instead of just being released, would the resulting value of (g) acceleration due to gravity have been different?why? tnx....please answer it...

**PHYSICS**

a)speed is the magnitude of instantaneous velocity. Is the average speed equal to the magnitude of the average velocity? Justify b)under what condition is the average equal to instantaneous velocity? c)a car travels 40 mph for 2 hrs and 60 mph for 3hrs.what is the average speed?

**Eth 125**

Ms. Sue. If you are uneducated enough as to refer to the concept of orientalism as people from asian countries. Please check your facts before posting answers. Orientalism clearly defined is answer C

**physics**

the forces on the table act on a ring but are said to be concurrent. if the cords were rigidly to the ring would the forces necessarily be concurrent?? will you please give me some explanation answers about this...thanks a lot..

**pHysics**

yeah...tnx drwls...you're the best...how can you answer all those questions in just one click... i hope to have that kind of knowledge too.. tnx again

**pHysics**

a rope 26 ft long is attached to two points A and B, 20 ft apart at the same level. A load of 250lb is carried at the middle of the rope. what force is exerted on A. please answer this immediately i need it...thanks a lot...

**physics**

a brick is dropped (0 initial speed) from the top of a building. the brick strikes the ground in 2.5 seconds. you may ignore air resistant so the brick is in free fall. A)how tall in meters is the building? B) what is the magnitude of the brick's velocity just before it re...

**college**

a ball is thrown vertically upward from the ground with the velocity of 30m/s, a)how long will it take to rise to its highest point? b)how high does the ball rise? c)how long after projection will the ball have the velocity of 10m/s upward? tnx

**Geometry**

An antique dealer visited three shops. She spent $25 at the first shop. At the second shop, she spent half of her remaining money. At the third shop, she spent one third of her remaining money and had $60 left. How much money did the dealer have originally?

**Geometry**

Larry, Lionel, and Lester painted a fence. Larry painted the first 1/3 of the fence. Lionel painted 3/5 of what rtemained. Lester painted the final 40 ft. How long is the fence?

**geometry**

A snail is crawling along a meter stick. At a certain point the snail stops. The snail needs to crawl three times as far as it has already crawled in order to be 4 cm from the end. How far has the snail already crawled?

**physics**

A person with mass 70 kg is climbing a ladder (length 6m, mass 20 kg) that leans against a smooth wall (no friction). A frictional force fs between the ladder and the floor keeps it from slipping. The angle between the ladder and the wall is 30 degrees. What is the magnitude o...

**physics**

Two identical loudspeakers are 2 m apart. A person stands 4.6 m from one speaker and 3.4 m from the other. What is the lowest frequency at which destructive interference will occur at this point?

**physics**

A 1210 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1820 N crate hangs from the far end of the beam. The angle between the beam and the horizontal is 30 degrees upwards and the angle between the horizontal and th...

**physics**

your approach makes a lot of sense. thanks for your help!

**physics**

a 20 g bullet strikes a 0.7 kg block attached to a fixed horizontal spring whose spring costant is 5600 N/m and sets it into vibration with an amplitude of 25 cm. What was the speed of the bullet before impact if the two objects move together after impact?

**algerbra**

i cant solve this can someone help me. 19.6 + X^2/2 ={(.007852*X /.001285)^2}/2 i know the answer is 1.01 but how do i get that

**physics**

how fast does the level of water in a full 2m high, 10cm diameter tank reduces when a 4cm diameter hole is opened at the bottom?

**college physics**

how fast does the level of water in a full 2m high, 10cm diameter tank reduces when a 4cm diameter hole is opened at the bottom?

**college physics**

find the weight of a piece of wood with a density of .5 g/cm cubed. which when attached to a 5kg stone in water it will sink. the density of the stone is 3g/cm cubed

**Psychology**

Post Hypnotic suggestions are best represented by which of the following Cocercive statements commands new ideas for self improvement Criticisms

**Psychology**

Either nightmares, night terrors, daydreams, or archetypical dreams

**Psychology**

What are dreams that contain symbolic characters and appear surreal?

**health**

The primary goal of wellness is the ability to achieve A.freedom from disease. B.a multicultural view of health. C.the highest possible quality of life. D.greater control over lifestyle decisions.

**Science**

using filtration??

**Chemistry**

LOL

**college physics**

find the frictional force exerted on a 20kg block pulled slowly over a horizontal floor using a rope which makes a 30 degree angle over the horizontal. the pulling force is 100N??? i found the Fn to be 146 N what do i do from there?

**philosophy**

What are key differences between the ontological, teleological, and cosmological arguments? Identify the philosopher who you think best supports his or her argument. Explain your answer briefly.

**physics**

a sled is pulled at a velocity across a horizontal snow surface. if a force of 8.0x10 to the first power N is being applied to a sled rope at an angle of 53 degrees to the ground, what is the magnitude force of friction

**10th grade**

the circle is circumscribed by the pentagon as shown (not drawn to scale). If QZ=10, YX=9, XW=9, UW=17, and SU=10, find the perimeter of the pentagon.

**englsh 3**

we are doing conjuction and compound sentences in class, and i need help diagraming this sentence: Little Red Ridinghood and her mother packed her basket witk cookies for her grandma.

**Government**

Which of the following is not a long term trend marking the expansion of suffrage in the United States?

**5th grade math**

Thanks! It was hard when I wasnt thinking that way! Now, I am able to do the rest of my homework without any trouble! Thanks for explaining it!

**5th grade math**

I came up with the answer of 12. Common greatest factor is 12. hope I did it right!Thanks again!

**5th grade math**

My class is selling flowers. We want to arrange them so that they are all in equal rows with no row containing different types of plants. Using the numbers from the table provided, what is the largest # of plants we can put in each row? (Marigolds-48 pots, Pansies-24 pots, Pri...

**Math**

Oh that makes sense. I forgot to look at the largest common factor. Thank you, I was thinking it was every other and how many can fit onto a tray! Thank you! That may help me in my other problem as well!

**Math**

It is a story problem. Courtney has 27 chocolate chip cookies and 36 oatmeal raisin cookies. She needs to arrange them on trays. She doesnt want to combine either type of cookies and she wants the same number on each tray. What is the largest number of cookies she can hve on e...

**algebra**

solve x-5/x*x-54 -7x+8/x*x-3x-54 +x-2-x*x+12x+36

**algebra 2**

The volume ( v) of a gas in a container at a constant temperature varies inversely as the pressure (p). If the volume of a gas is 24 cubic centimeters when the pressure is 16 pounds, what is the volume under a pressure of 30 pounds?

**geometry**

A right cylinder has a radius of 3 and a height of 12. What is its surface area? If necessary, round your answer to two decimal places.

**college physics**

A typical wavelength of infrared radiation emitted by your body is 25 µm (2.5 multiplied by 10-5 m). What is the energy per photon of such radiation?

**chemistry**

use resonance theory to account for the fact that aniline(pKb 9.37) is a weaker base than cyclohexanamine(pKb 3.34)

**Chemistry**

1)Write the general equation used to determine the volume of stock required to make a given concentration of standard? Define any terms you used. ----use the 100ml flasks to create four serial dilutions of the stock 10,000uM nitrate solution that has been provided. Prepare thr...

**chemical oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface-----------...

**chem 1p1**

An automobile tire at 22oC with an internal volume of 20.0L is filled with air to a total pressure of 30. psi(pounds per square inch). [1 atm = 14.696 lb/in2]. What is the amount in moles of air in the tire? If the air is mostly nitrogen, how many grams of it would be in the t...

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface-----------...

**Chemical Oceanography**

Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units. ------ represents a Box outline Surface-----------...

**chemistry**

write the two half-reactions for the reduction of nitrate to nitrite using Cd2+

**home economics**

okay so i have these 4 questions that i have no clue about...i asked my mom and aunts but they dont make clothes so im stuck on these 4 question i would appreciate if you could please help me 7. You're sewing a child's nylon jacket. You notice the fabric frays easily. ...

**college**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

**statistics**

The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5 please write out the eq for me

**physcis**

THIS WEBSITE IS SO SLOW. NO ONE EVER ANSWERS.

**English lit**

Have writers block. Need help with Julia Alvarez poem!? I have to write a 1000 word analysis of the Julia Alvarez poem "Ironing Their Clothes". I need help with a thesis. I have no idea what to write about! 1 year ago Additional Details With a hot glide up, then down...

**chemistry-please someone answer...i am clueless**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

**chemistry**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

**analytical chemistry**

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

**college chem**

can you elaborate a little more on how to so it

**college chem**

can you elaborate a little more on how to so it

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5? can someone please help me with steps to get the answer

**college chem**

what are the numbers for Conjugate acid and conjugate base

**college chem**

how did u get that can you please explain the steps

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5

**math**

Thank you the site was very helpful.

**math**

I really don't understand this question and I can't seem to be able to solve it. Can anyone help me? Write a composite number between 7 and 20.

**chemistry**

A certain reaction has a delta H= -75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the Activation energy of the forward reaction by 15 kJ. What is the activation energy of the reverse reaction in the presence of this same catalyst?

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