Friday

July 25, 2014

July 25, 2014

Total # Posts: 850

**Trigonometry**

Solve SSA: B= 12.1 degrees b= 16 a= 23.9

**Trigonometry**

Use Heron's formula: a=46 b= 52 c= 67

**Trigonometry**

verify the identity: 1-cos^2x/1-sinx= -sinx

**U.S. History**

True or False? "The rebels are our country men again." Is a quote that is referring to the Emancipation Proclamation.

**U.S. History**

True or False? General Sherman's 60 miles path of destruction was from Atlanta, Georgia to Savannah, Georgia?

**U.S. History**

True or False? If a soldier had a wounded arm, it would most likely be amputated during the Civil War.

**U.S. History**

Life for African Americans in the South changed after the Civil War because many Africans Americans...?

**MATH ~~**

HELP Please!! Sample autocorrelations at lag1, lag2, and lag3 denoted by r1, r2, and r3 of weekly sales of shampoo bottles was found 0.4551, 0.3376, and 0.2514. Using the criteria of your text, the maximum number (‘n’) of weeks for shampoo bottles sales to be station...

**physical science**

true/false All units of energy are vectors.

**physical science**

true /false for every action, there is an equal and opposite reaction is best defined as Newton's Third Law

**physical science**

true/false A lens that converges light is concave

**physical science**

true/false the force of friction always opposes motion.

**Geometry**

A square is circumscribed about a circle. What is the ratio of the area of the circle to the area of the square? A. 1/4 B. 1/2 C. 2/π D. π/4

**math**

Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6

**math**

Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6

**math**

Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6

**physics ( need answer very very soon pleaseeeee)**

how do we find out the electron charge and mass if we dont know what type it is?

**physics ( need answer very very soon pleaseeeee)**

a. Acceleration is a = e*E/m e is the electron charge and m is the electron mass b. Solve the equation Since the electron's velocity component parallel to the plates remains the same as when it entered, t = 0.10 m/(3*10^6 m/s)

**Astronomy**

In what ways do Earth and the moon move through space? How do these motions produce such phenomena as day and night, the seasons, phases of the moon, and eclipse?

**Astronomy**

You are correct.

**Physics**

Explain why objects experience a buoyant force when immersed in a fluid. How can you find the value of the buoyant force?

**calculus**

The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres for a sample of 30 use...

**Chemistry**

Explain why carbohydrates, lipids, and proteins are important parts of a well-balanced diet.

**Chemistry**

so 3 to 6...

**Chemistry**

What is the ratio of carbon atoms to hydrogen atoms in the compound 2CH2 = C2H4? A. 1 to 9 B. 9 to 1 C. 3 to 6 F. 6 to 3

**Chemistry**

What is an unsaturated hydrocarbon?

**Chemistry**

Material X is an organic compound that mixes poorly with water and is highly flammable. Of the following choices, material X is most likely a(n): A. Carbohydrate B. Ester C. Alcohol D. Hydrocarbon

**Chemistry**

C5H11Oh represent... A. Amino Acid B. Organic Acid C. Alcohol D. Ester

**Math**

It would be mostly addition or subtraction...

**pre algebra**

If you wanted factored its 2(5x+37). If wanted it simplified its 10x+74. If you wanted to combine the expressions its 10x+74. If you wanted it evaluated plug in x.

**physics**

A block of mass M connected to an untstretched horizontal spring of spring constant k is hit by a bullet of mass m which has a velocity V just before the collision. The bullet stays in the block. The coefficient of friction between the block and surface is b. Explain how do yo...

**Pre-Calculus Vectors**

nvm got it

**Pre-Calculus Vectors**

Let u = 2i − j, v = −i + j. Find 2u - 3v.

**Pre-Calculus**

My "diagram" messed up. The y axis is broken its supposed to look like a Cartesian plane.

**Pre-Calculus**

Let F1 = 219.5, F2 = 447.3, θ1 = 52.79◦, θ2 = 7.831◦. Find the magnitude of the resultant F1 _\|_ θ1 (in quadrant 3 positive) | F2 _|/_ θ2 (in quadrant 1 positive) | I know this is probably hard to understand but I cannot draw diagrams on here

**algebra 1**

given;n+8(n+20)=110 1;n+8n+20=110 2;9n+20=110 3;9n=110-20 49n=90

**Physics 20**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?

**Physics 20**

dynamics A curling stone has a mass of 20kg. a curler pushed the stone across the ice to launch it down the rink. a)if the curler starts to move the stone by pushing it with 15N, what is the stones initial acceleration? b)once moving, how much force is required to keep the sto...

**physics**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?

**physics 20**

DYNAMICS: a skier starts at the top of a 30m hill ta an anle of 20 degrees. the skier goes straight down the firctionless slope. How long will it take the skier to get to the bottom?

**Physics 20**

Dymamics unit A car standing still is struck by 2 other cars simultaneously. a beetle applies a force of 2350N [N60degreesE] and a truck applies a force of 4150N [SW]. What is the net force acting on the stationary car?

**physics 20**

DYNAMICS: A 54kg fireman slides down a pole of a distance of 3m. if the man hits the groung at 4.4m/s than what will the force of friction acting on the man due to the pole?

**Physics 20**

Dymamics unit A car standing still is struck by 2 other cars simultaneously. a beetle applies a force of 2350N [N60degreesE] and a truck applies a force of 4150N [SW]. What is the net force acting on the stationary car?

**English**

what is art online? ( online art galeries, virtual art, nowadays art or something different?)

**English**

What is the role of art in people’s life?

**Physics 1301**

ac = (omega^2)*(radius) = (31.2^2)*(0.12 m) = 116.8

**english**

Section I: Make all necessary corrections to the following sentences. If a sentence has no errors, mark it correct as written: I did it but need reassurance. first sentence is teachers the second one is mine. 1. I’ve always wanted to go to college, it is something my moth...

**world geography**

Start locally and then work your way up is basically very common if you start with little.

**Pre-calc**

for some reason i am gettin 23pi/24

**Pre-calc**

how many radians are displaced by the minute hand of a clock between 1:00 pm and 6:45 pm of teh same day

**equal to greater than and less than**

bryce and jewel were playing with kick balls in gym class. Bryce kicked seven tenths of the kick balls into the net. Jewel kicked twenty three thirtieths of the balls into the net. Which athlete scored more goals?

**geometry**

I got this problem wrong on a test and i want to know how to fix it. In triangle ABC, angle A is 20 degrees and side AC is 7.89 units, find the other sides and angles

**physics**

A certain roller coaster has a circular, vertical loop of radius 10 meters, such that at its top the riders are upside down. How fast does the roller coaster move at this point if the riders feel perfectly weightless when passing the top of the loop?

**chemistry**

how would you say in words LiMnO2 ? would lithium manganese oxide be correct?

**physics**

magine a straight line connecting the centers of the earth and the moon. At some point along this line the gravitational forces pulling a spacecraft towards the moon and towards the earth exactly balance each other, and the craft could just sit there in (an unstable) equilibri...

**chemistry**

what effect would each of the errors decribed below have on the concentration of potassium hydrogen phthalate... 1) so of the solids potassium hydrogen phthalate will spilled when transfering into the beaker... 2) not enough water was added to bring the volume up to the mark

**Chemisrty**

What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3) = 1.8 × 10−5]

**math**

The Wildlife Federation surveyed 170 San Diego residents. The results are as follows: 26 had a membership to the Birch Aquarium 44 had a membership to the San Diego Zoo 17 had both construct a venn diagram answering the foloowing questions i. How many had only a zoo membership...

**Physics**

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s2 . What is the mass of the car?

**physic**

examples of mechanicals waves

**Chemistry**

moles of NaOH = .100 x 35.46 / 1000 = 0.003546 2NaOH + H2A = Na2A + 2H2O so moles of H2A = 0.001773 these are in .43 g so mass of 1 mole = .43 /0.001773 = 242.53 g / mole .. molar mass of the acid

**hum**

Explain the basis of judgement you believe should be used for addressing the moral questions oe delimmas surroundingclimate change

**Math**

What is the circumference of a circle with a diameter of 10 m.

**Math**

If a right triangle has legs of 9in. and 12in. What is the length of the hypotenuse?

**Alg II**

I have a rectangle whose sides are in the proportion b:a, where b is the longer side. I draw a line parallel to a inside the rectangle in order to break it up into a square with sides of length a and a second rectangle. Amazingly, the sides of the new smaller rectangle are in ...

**geometry**

I've got it! Thank you very much for your help!

**geometry**

The real problem is that I do not comprehend the question. The part I'm really stumbling over is the "rotated about the side AB". I have no idea what that means.. I have another question that is quite similar...so if anyone can explain, it would be greatly apprec...

**geometry**

The rectangle ABCD is rotated about the side AB. Find the volume of the solid defined by this rotation. AB = DC = 4cm AD = CB = 2cm

**Math **

to identical jars are filled with equal amount of marbles. the marbles are coloured red or white. the ratio of red to white marblesis 7:1 in jar 1 and 9:1 in jar 2. if there are 90 white marbles altogether, determine the number of red marbles in jar 2.

**physics**

10cm * 10 cm *10 cm

**french**

How would you say it would be necessary using the verb falloir?

**physics cant firgure this out**

would it be 310/(298-310) im just makeing sure let me know please thank you

**physics cant firgure this out**

A Carnot air conditioner maintains the temperature in a house at 298 K on a day when the temperature outside is 310 K. What is the coefficient of performance of the air conditioner?

**physics**

why does the voltage across the thermistor and resistor add up to the voltage of the battery? thanks :)

**physics**

why is the current the same in the resistor and the thermistor in a series circuit? thanks :)

**integration**

Find the area of the region under the graph of the function f on the interval [-1, 2]. f(x) = 6x + 1 bound by the x axis

**physics**

Battery supplies a potential difference of 6v At a certain temperature the current in the 45ohms resistor is 0.08A How would you calculate the potential difference across the thermistor? thanks :)

**physics help**

A cylindrical air duct in an air conditioning system has a length of 3.5 m and a radius of 5.00 10-2 m. A fan forces air (ç = 1.8 1 x0-5 Pa·s) through the duct, such that the air in a room (volume = 242 m3) is replenished every 12 minutes. Determine the differenc...

**Chemistry**

suppose a pippetting error was made when preparing the diluted vinegar, but the diluted vinigar solution was uniform and the naoh titration values were consistant. when will the student learn that the experiment result was not accurate explain

**Chemistry**

suggest why the acetic acid concentration of a food vinegar must be known for regulatory health and saftey reasons

**physics**

what is the first anwser? (A)

**Chemistry**

so then would it look like N= 14.01 and h= 1.008 add them and times by 40?

**Chemistry**

Given the following equation: NH3 +O2 ¨ NO + H2O Calculate the number of grams of ammonia needed to form 40.12 moles of nitrogen monoxide. ok so is this how its to look 4(NH3) + 5(O2) --> 4NO + 6(H20)

**Chemistry**

does that work the same way with moles

**Chemistry**

Given the following equation: NH3 + NH3 +O2 ¨ NO + H2O Calculate the number of grams of ammonia needed to form 40.12 moles of nitrogen monoxide.

**physics**

A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beam. (a) Calculate the magnitude of the tension in the wire. (b) Calculate the magnitude of the horizontal and vertic...

**physics**

A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beam. (a) Calculate the magnitude of the tension in the wire. (b) Calculate the magnitude of the horizontal and vertic...

**4th grade**

why is 7 times 8 not a number sentance

**4th grade math**

forget it

**4th grade math**

umm can i ask you something???????

**4th grade math**

idk math

**math-algebra**

how do i solve this using the substitution method 3x+2y=7 2x-3y=-4 x=7-2y/3 2(7-2y/3)-3y=-4 this is where i get stuck help would be much apprieciated

**7th grade Math**

Describe at least two ways of finding a missing side length in a pair of similar figures.

**help physics**

the earth (mass=5.98x10^24kg) rotates around the sun in a orbit that is approximately circular, with a radius of 1.5x10^11m find the orbital speed of the earth around the sun

**physics**

the earth (mass=5.98x10^24kg) rotates around the sun in a orbit that is approximately circular, with a radius of 1.5x10^11m find the orbital speed of the earth around the sun

**math**

completing the square 3x^2 +15 -33 =0 a=3 b=15 c=-33 -15+or- sqrt225-4*3*-33/2*3 -15+or-sqrt225+396/6 is this right because don't you have to subtract not add the 396 please help. thanks

**Chemistry**

Well i don't think its the first two but i'm not sure about the last two I think it might be d

**Chemistry**

Sea water conducts electricity. Which statements give the best explanation for this a) Ions are able to move around in sea water b) Electrons can pass from ion to ion in the sea water c) The sea water contains more ions with positve charges than ions with negative charges d) T...

**physics**

the heating effect of the fuse wire is caused by... a) emmision of moving electrons by stationary atoms b) absorption of moving electrons by stationary atoms c)collisions by moving electrons and stationary atoms thanks

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