Friday
April 18, 2014

Posts by peter


Total # Posts: 804

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 ...

9th grade alegbra
IDK

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

math
(5)/(x) - (2)/(x-3) = 0 5(x-3) - 2(x) = x(x-3) 5x-15-2x = x^2 -3x 3x-15 = x^2 -3x this is where i get stuck please help thanks

math
4x-5/1-6x = x+10/x-6 your help would be much appreciated

math
please can you help me solve the following equations and please can you show your method. thanks 1) 4x+3/5x-6 = x-1/x-6 2) 4x-5/1-6x = x+10/x-6 thanks once again

economics
3 . The production of housing has the following form: H = number of housing units = 4(L + 10)1/2 + 80 (M + 3)3/4, where L is land and M is materials. One unit of L costs 100 and 1 unit of M costs 12. Find the cheapest ways to produce 1000 housing units, 2000 housing units, and...

MATH
Determine the diameter of the largest circle that can be drawn between the parallel lines y=2x and y=2x-5.

math
find x 4x-5/1-5x = x+1/x+7 please can you show me the method thanks

math
factorise 9x^2-29x+34 thanks

math
find x x^2-3x-4 = x^2 +11x+24 please can you show me you method thanks

5thgrade math
214 = 200 182 = 200 est. 200 + 200 = 400 sol. 396 1532 = 1500 176 = 200 est. 1500-200 = 1300 sol. 1356

math
22010 + 2056

math
find x x-5/x-2 = x-9/x-7 Method (x-5)(x-7) = (x-9)(x-2) x^2-12x+35 = x^2-11x-18 I get stuck here help would be must appreciated

math
rationalize 3/7-root3 would it be 21+3root3/46

math
5/11+root5 How would I rationalize this I think it would be - Multiply both sides by 11-root5 then use the foil method on the denominator to give you 55-5root5/121+5root11-5root11-5 the 2 roots would cancel out giving you 55-5root5/12-5 so would the answer be 55-5root5/7 thank...

Chemistry
A new element, Canadium, not found on earth, contains 3 isotopes. given the following information, calculate the atomic mass of Canadium. Isotope Mass (amu) % abundance 1 429.633 21.29 2 429.121 42.47 3 429.398 ?

math
(3x + 5) + (2x - 3)

physics
A 1.20*10^2 kg crate is being pushed across a horizontal floor by a force P that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.350. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force ...

chemistry
I am completing a lab where I had to determine the mass percent of Mg(OH)2 in an antacid tablet , and I am trying to determine sources of error for my lab. I was wondering if when I back-titrated with NaOH after I overshot on purpose would the added OH- ions form extra Mg(OH)2...

Physics
An object with a mass of 3.09x10^0 kg is subjected to a force of 8.8505x10^2 N directed at an angle of 1.6968x10^2 degrees from the x axis. A second force of 2.98725x10^3 N acting in the negative Y directions is also applied to the object. To two significant figures what is t...

Physics
A dynamite blast sends a piece of rock (shatter) straight upwards. After 2.31x10^0 s the piece of rock has a velocity of 1.56x10^1 m/s. Assuming there is no air resistance, what is the initial velocity of the rock, to two significant figures?

Physics
A worker at the top of a deep well, drops a hammer into the well. The hammer takes 2.81x10^-2 minutes to fall. How deep is the well?

physics
a force of 125N is required to extend a spring by 2.8cm. what force is required to stretch the same spring by 3.2cm

adult education
how is the plot period and amplitude?

adult education
I´ve got this question y=5cosx-3sinx

physics
A object is throw up with a speed of 25m/s. suppose that the gravity is 10m/s^2. Define the position and the velocity of the particle for the following times: 1second, 4second and 10second

English
Which sentence is more common: 'I like seeing people happy' or 'I like to see people happy'?

Physics
The sum of 5.2713x10^3 + 6.54014x10^3 expressed to 4 significant figures would be?

Physics
2.3x10^8?

Physics
so would it be 2.35 x 10 ^6

Physics
ok i got an answer of 2352363.975

Physics
The result of 1.51751x10^4 divided by 6.451x10^3 to 2 significant figures is?

math
set shauna =x jorge = 2x-1 kenya= 2x tony= 2x-3 (x+2x-1+2x+2x-3)/4=4.5 (7x-4)=4.5 shauna=3 1/7 jorge=5 2/7 kenya=6 2/7 tony=3 2/7

physics
you are mean

Math
Statements: Reasons: 1.AE=BE 1.Opposite the equal sides. 2.angle AED = Angle BED SSS congruent triangle EAD = triangle EBD

Math
Given a circle with chord AB and diameter CD, prove that triangle ABD is isosceles if AB is perpendicular to CD.

Chemistry
A volume of 70.0mL of aqueous potassium hydroxide(KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the solution if 19.2mL of 1.50M H2SO4 was needed? The equation is 2KOH+H2SO4->K2SO4+2H20

Chemistry
Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, , can be titrated against a solution of potassium permanganate, . The following equation represents the reaction: 2KMnO4+H202-> 3H2...

chem
one isotope of carbon has the atomic # 6+ the mass #14. An Atom of this isotope contain how many elctrons

physics 2
A thin nonconducting rod is bent to form a semi-circle of radius R. A charge Q is uniformly distributed along the upper half and a charge -Q is uniformly distributed along the lower half, as shown int he sketch at the right.find E vector at P, the center of the semi-circle. th...

physics
A thin nonconducting rod is bent to form a semi-circle of radius R. A charge Q is uniformly distributed along the upper half and a charge -Q is uniformly distributed along the lower half, as shown int he sketch at the right.find E vector at P, the center of the semi-circle. th...

analogy
large is to small, feast is to

math
I would say its quite likely because it is greater than 50% but less than 100% (certain)

College Physics
A red car and a green car, identical except for color, move toward each other in adjacent lanes and parallel to an x-axis. At time t=0, the red car is at x sub r = 0 and the green car is at x sub g = 220m. If the red car has a constant velocity of 20km/h, the cars pass each ot...

literature
I think its a sentence from Shakespeare's Sonnet 116.

math
15 dollers

biology
Research the sea lamprey, an exotic species that has had a great impact on the fish communities of the Great Lakes. a) Describe the niche of the sea lamprey. b) Find out how sea lampreys may have entered the Great Lakes ecosystem. c) Identify the interspecific interactions of ...

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