Wednesday
August 27, 2014

Posts by peter


Total # Posts: 867

physics
A diver leaves the board traveling at 3.5 m/s at an angle of 75º with respect to the horizontal. What is her speed when she hits the water, 3 meters below?
September 27, 2011

math
A cube measures 2 meters on each side. What is the volume of the cube?
September 25, 2011

Math
simplify (8 – i) – (4 – i) using Complex Numbers
September 7, 2011

algerbra
if 16-b<7 then, a) b < or equal to 8 b) b > 9 c) b < or equal to 7 d) b > or equal to 7
September 4, 2011

chemistry
Q(H20)=100g x 4.18 JK-1g-1 x 30K =100 x 4.18J x 30 (Since the rest cancel each other out) Wallah
September 3, 2011

Algebra II
"The smallest integer divisible by 10 and 32 is 160, and the smallest integer divisible by 6 and 20 is 60. The difference between them is 100." - Princeton Review
July 26, 2011

Algebra II
I think it's C.
July 26, 2011

Pre-Calc
Let cis Θ = cos Θ + i sin Θ. Let z1 = 3 cis 25 and let z2 = 4 cis 115 Find z2^6
July 25, 2011

Occ
(x^2 +4)y = 2x
July 25, 2011

Math
Let cis Θ = cos Θ + i sin Θ. Let z1 = 3 cis 25 and let z2 = 4 cis 115 Find z2^6
July 25, 2011

geometry
You can't find out the scale factor if you aren't given any numbers for the sides of the triangles.
July 21, 2011

Algebra
If A + B = 12, and B + C = 16, What is the value of A + C? A. -4 B. -28 C. 4 D. 28 E. The answer cannot be determined from the given information.
July 13, 2011

math
each side of a square painting id 5 ft long.what is the painting area.what is the painting perimter?
June 20, 2011

algebra
use 2 as the base!, 2 raise to the power of n, where n is the number of elements in a set.
June 11, 2011

algebra
whats the fastest and most easiest way to find all the subsets in a given set?
June 11, 2011

Chemistry
How do you balance the equation when citric acid is added to NaOH?
June 8, 2011

Geometry
A solid is composed of a cube with side length 6 meters and a hemisphere with diameter 6 meters. Find the volume of the solid.
June 1, 2011

Geometry
A rectangular prism with 2 little square bases of a radius of 1m. It's height or rectangular length is 5m. Please help me find the surface area. The answer should be less than 50m².
June 1, 2011

Mathematics
Plug in d. D = the number of minutes the practice drills last "30 minutes are spent on practice drills." 20 + 30 + 10 = 60 minutes.
June 1, 2011

Trigonometry
Solve SSA: B= 12.1 degrees b= 16 a= 23.9
May 30, 2011

Trigonometry
Use Heron's formula: a=46 b= 52 c= 67
May 30, 2011

Trigonometry
verify the identity: 1-cos^2x/1-sinx= -sinx
May 30, 2011

U.S. History
True or False? "The rebels are our country men again." Is a quote that is referring to the Emancipation Proclamation.
May 25, 2011

U.S. History
True or False? General Sherman's 60 miles path of destruction was from Atlanta, Georgia to Savannah, Georgia?
May 25, 2011

U.S. History
True or False? If a soldier had a wounded arm, it would most likely be amputated during the Civil War.
May 25, 2011

U.S. History
Life for African Americans in the South changed after the Civil War because many Africans Americans...?
May 25, 2011

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 ...
May 25, 2011

physical science
true/false All units of energy are vectors.
May 23, 2011

physical science
true /false for every action, there is an equal and opposite reaction is best defined as Newton's Third Law
May 23, 2011

physical science
true/false A lens that converges light is concave
May 23, 2011

physical science
true/false the force of friction always opposes motion.
May 23, 2011

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
May 18, 2011

math
Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6
May 18, 2011

math
Basically 41 and 17/12 minus 27 and 7/12. So it's 14 5/6
May 18, 2011

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?
May 13, 2011

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)
May 13, 2011

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?
May 12, 2011

Astronomy
You are correct.
May 12, 2011

Physics
Explain why objects experience a buoyant force when immersed in a fluid. How can you find the value of the buoyant force?
May 12, 2011

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 ...
May 12, 2011

Chemistry
Explain why carbohydrates, lipids, and proteins are important parts of a well-balanced diet.
May 10, 2011

Chemistry
so 3 to 6...
May 10, 2011

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
May 10, 2011

Chemistry
What is an unsaturated hydrocarbon?
May 10, 2011

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
May 10, 2011

Chemistry
C5H11Oh represent... A. Amino Acid B. Organic Acid C. Alcohol D. Ester
May 10, 2011

Math
It would be mostly addition or subtraction...
May 9, 2011

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.
May 9, 2011

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 ...
April 21, 2011

Pre-Calculus Vectors
nvm got it
April 18, 2011

Pre-Calculus Vectors
Let u = 2i − j, v = −i + j. Find 2u - 3v.
April 18, 2011

Pre-Calculus
My "diagram" messed up. The y axis is broken its supposed to look like a Cartesian plane.
April 18, 2011

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
April 18, 2011

algebra 1
given;n+8(n+20)=110 1;n+8n+20=110 2;9n+20=110 3;9n=110-20 49n=90
April 11, 2011

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?
April 6, 2011

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 ...
April 6, 2011

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?
April 6, 2011

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?
April 6, 2011

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?
April 6, 2011

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?
April 6, 2011

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?
April 6, 2011

English
what is art online? ( online art galeries, virtual art, nowadays art or something different?)
April 6, 2011

English
What is the role of art in people’s life?
April 5, 2011

Physics 1301
ac = (omega^2)*(radius) = (31.2^2)*(0.12 m) = 116.8
April 4, 2011

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 ...
April 1, 2011

world geography
Start locally and then work your way up is basically very common if you start with little.
March 31, 2011

Pre-calc
for some reason i am gettin 23pi/24
March 29, 2011

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
March 29, 2011

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?
March 29, 2011

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
March 29, 2011

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?
March 23, 2011

chemistry
how would you say in words LiMnO2 ? would lithium manganese oxide be correct?
March 21, 2011

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) ...
March 20, 2011

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
March 13, 2011

Chemisrty
What is the pH of a 0.20 M solution of NH4Cl? [Kb(NH3) = 1.8 × 10−5]
February 22, 2011

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...
February 20, 2011

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?
February 1, 2011

physic
examples of mechanicals waves
January 31, 2011

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
January 24, 2011

hum
Explain the basis of judgement you believe should be used for addressing the moral questions oe delimmas surroundingclimate change
January 19, 2011

Math
What is the circumference of a circle with a diameter of 10 m.
January 17, 2011

Math
If a right triangle has legs of 9in. and 12in. What is the length of the hypotenuse?
January 11, 2011

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 ...
January 11, 2011

9th grade alegbra
IDK
January 11, 2011

geometry
I've got it! Thank you very much for your help!
January 9, 2011

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 ...
January 9, 2011

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
January 9, 2011

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.
December 18, 2010

physics
10cm * 10 cm *10 cm
December 17, 2010

french
How would you say it would be necessary using the verb falloir?
December 15, 2010

physics cant firgure this out
would it be 310/(298-310) im just makeing sure let me know please thank you
December 10, 2010

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?
December 10, 2010

physics
why does the voltage across the thermistor and resistor add up to the voltage of the battery? thanks :)
December 8, 2010

physics
why is the current the same in the resistor and the thermistor in a series circuit? thanks :)
December 8, 2010

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
December 8, 2010

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 :)
December 8, 2010

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 ...
December 4, 2010

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
December 3, 2010

Chemistry
suggest why the acetic acid concentration of a food vinegar must be known for regulatory health and saftey reasons
December 2, 2010

physics
what is the first anwser? (A)
December 2, 2010

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