Saturday
August 30, 2014

Posts by Rory


Total # Posts: 86

math
A vehicle having a mass of 1.5tonnes is standing on an incline of 18degree to the horizontal.Determine the components of its weight parallel and perpendicular to the road surface.
March 11, 2014

Math
Haha me and Rory r having a hard time of this we go to the same school
March 6, 2014

Math
What is the least number that is both a multiple of 35 and a multiple of 20?
March 6, 2014

Physics HELP!!
Sound enters the ear travels through the auditory canal and reaches the ear drum, The auditory canal is approximately a tube open at only one end. The other end is closed by the eardrum. A typical length for the auditory canal in an adult is about 2.775 cm. The speed of sound ...
November 30, 2012

Physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
November 30, 2012

Physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
November 30, 2012

Physics
A standard man shouting loudly produces a 87.4dB sound at a distance of 7.05m. At what rate does he emit sound energy? Express the result in J/s.
November 30, 2012

Physics HELP!!
The sound intensity of 1.2x10-12J/m2s is the threshold of hearing for humans. What is the amplitude of the motion of the air molecules if the speed of sound in the air is 343m/s and the density of air is 1.28kg/m^3? Take the frequency of the air molecules as 1000 Hz
November 24, 2012

Physics
An FM radio station broadcasts at 82.3MHz. Determine the period of the radio waves. I already go the answer: 1.22×10-8 s but help me with part b please!!! b). What is the wavelength of the waves?
November 24, 2012

Physics
Bats can detect small insects that are about equal in size to the wavelength of the sound the bat makes with its echolocation system. A bat emits chirps at a frequency of 17.7kHz. Using the speed of sound as 340m/s, what is the smallest insect the bat can detect?
November 21, 2012

Physics
A traveling wave has displacement D(x,t)=(3.00cm)sin(5.36x-6.71t), where x is in meters and t is in seconds. What is the wave speed of this wave? **snapshot graph at t=1/4 s
November 21, 2012

Physics
A hammer taps on the end of a 8.13m long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 10.00ms. What is the ...
November 21, 2012

Math/Statistics
Can anyone please help me explain confidence intervals. How does one tell/determine if a confidence interval is too wide? What indicates too wide? Thanks in advance!
October 2, 2012

Physics
Thank you all for your help, but I'm still confused, I converted miles to feet 145 miles= 765600 feet then what?
December 28, 2011

Physics
The De-orbit Burn The Shuttle must reduce its velocity at a pre-calculated point in its orbit in order to return to Earth. In order to reduce the velocity and change the orbit of the Shuttle, a maneuver called the de-orbit burn is performed. For this maneuver, the Shuttle is ...
December 28, 2011

Calculus
Let f(t) be an odd function Using properties of the definite integral plus simple substitution show that if f is continuous on [−a, a] for a positive number a, then Z a −a f(t) dt = 0
December 4, 2011

Math
find the equation to the tangent to the curve y = (4x + 3)^5 at the point (-0.5, 1), giving your answer in the form y = mx + c
October 4, 2011

Math
i need the answer to finding the number of three letter permutations of the letters l,s,u,v,r
April 13, 2011

chemistry
Acetic acid ionizes in water according to the following equation: CH3COOH = H^+ +CH3OO- if the solution is .773 M acetic acid, what is the concentration of H^+?
November 13, 2010

chemistry
When heated, CaCO3 decomposes as follows: CaCO3 (s) = CO2 (g) +CaO (s) in an experiment, 10.00 g of CaCO3 was placed in a .500 L container, and when it was heated to a constant temperature, 50% of the solid decomposed. What is the value of Kc for this reaction under these ...
November 4, 2010

Chemistry
i ended up with x=.28 and i multiplied it by 2 and it was not the right answer
November 4, 2010

Chemistry
Pheromones are compounds secreted by the females of many insect species to attract males. One of these compounds contains 80.78%C, 13.56%H, and 5.66%O. A solution of 1.41g of this pheromone in 9.23g of benzene freezes at 2.73 degrees C. what are the molecular formula and molar...
October 18, 2010

algebra
(-3x+4)+(x tothe 2nd power +x-5)
May 15, 2010

Italian
Hello, I am teaching myself Italian from a textbook, Ciao! Sixth edition, but I am getting confused with some of the answers, as the information is lacking in a sound explanation. Does anyone know where I can find the answers to the textbook questions, so I know if I am ...
December 8, 2009

Health (Methods of Knowing)
Hello, in class we are discussing scientific methods of knowing (tenacity, a priori, etc.) We have been discussing that fact that each is different, and how to approach patient-therapist solutions. My question: what is a unique way of bringing together the different methods of...
October 7, 2009

Chem
Sulfuric acid, H2SO4, reacts with CaF2 according to: CaF2 + H2SO4 ---> CaSO4 + 2 HF What is the minimum amount, in g, of impure H2SO4 (which is 83.5% H2SO4 by mass) that would be required to produce 16.2 g of HF when reacted with excess CaF2 ? Could someone walk me through ...
May 16, 2009

College Finite Math
Suppose for this problem that Pr[E]=13/24 and Pr[F]=5/8 and Pr[(E U F)'] = 0. Finding Pr[E/F] and Pr[F/E]. For this problem I added 13/24 + 5/8 and got 1.17, therefore, I assumed that .17 is the intersection between Pr(E) and Pr(F). I know that to solve these problems I ...
March 16, 2009

Sose
Hi there iam stuck with question on my sose assignment the qustion is what is the differance between a tidle wave and a tsnarmi? Hpoefully you can help ffrom Rory p.s im in grade 8
March 8, 2009

math
Change 72 inches into feet: 72/12 = 6 ft 6 X 8 = 48 square feet
February 17, 2009

Finite Math
That is the only information I know. There is a problem in the book similar to this one and I have that answer perhaps that would help. In the book, the problem is 5 skits and 3 commercials and the answer is 3240. I have no idea how they got that or how to apply it to my ...
February 17, 2009

Finite Math
Unfortunately that is not the right answer... It was a really good effort though and I do appreciate you helping.. Any other ideas? This problem is driving me crazy! :)
February 17, 2009

Finite Math
A producer wants to put on a variety show on television. Assume that the producer has 9 skits and 6 commercials available. In how many ways can the producer create a television show? We assume that a skit is never repeated, but (unfortunately) commercials can appear any number...
February 17, 2009

Re-writeacher
thankyou for finding those sites they are very helpful. ive got a few more questions im struggling on but im going to try and find the info myself. is it ok if i ask again for help?
January 11, 2009

english
i am doing a school project about william shakespeare. i am struggling to find out who his influences were . thanks for your help!
January 11, 2009

physics help
i didnt get that....
December 14, 2008

physics help
a particle moves uniformly around the circumference of a circle whose radius is 8 cm with a period of pi/20 s. the angular velocity w of the particle is a. 2.5 rad/s b. 3.2 X 10^2 rad/s c. 40 rad/s d. 7.9 rad/s e. 96 rad/s please explain thanks!
December 14, 2008

physics
ohh... nevermind!
December 14, 2008

physics
but.. what formula do i use?
December 14, 2008

physics
thanks
December 14, 2008

physics
a penny is placed .1 m from the center of a turntable. if the coefficient of static friction between the penny and the turntable is .5, the maximum linear speed at which the penny can travel without slipping is approximately a) .49m/s b) .7 m/s c) 1.3 m/s d) 1.4 m/s e) .2 km/s...
December 14, 2008

physics
thank you
December 14, 2008

physics
a wheel is rotating at 30 rev/min. The angular velocity of the wheel is a. 2pi^2 rad/s b. 2pi rad/s c. 2 rad/s d. pi/2 rad/s e. pi rad/s explain please!
December 14, 2008

us history
a majority of the early english migrants to the chesapeake bay area were a. families with young children b. indentured servants c. wealthy gentlemen d. merchants and craftsmen e. disfranchised catholics is it b?
December 14, 2008

us history
thanks!
December 13, 2008

us history
which of the following best describes the situation of freedmen in the decade following the civil war? a. each was given 40 acres of land and a mule by the union government b. all were immediately granted political equality by the Emancipation Proclamation c. the majority ...
December 13, 2008

physics- please help me!
Earth turns on its axis approximately once every 24 hours. The radius of Earth is 6.38 X 10^6 m. a.) If some astronomical catastrophe suddenly brought Earth to a screeching halt (a physical impossibility as far as we know), with what speed would Earth's inhabitants who ...
December 9, 2008

physics
thanks!
December 7, 2008

physics
a spaceship is traveling to the moon. at what point is is beyond the pull of the earth's gravity? a. above the atmosphere b. half way there c. when it's closer to the moon than the earth d. never beyond the pull of the earth
December 7, 2008

physics
yeah you were right thanks.
March 1, 2008

physics
A 62.0 kg diver falls from rest into a swimming pool from a height of 3.50 m. It takes 1.92 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.
March 1, 2008

physics
yeah the only thing you did wrong was the final answer it should be 34.72E3 W
March 1, 2008

physics
A car (m = 690.0 kg) accelerates uniformly from rest up an inclined road which rises uniformly, to a height, h = 49.0 m. Find the average power the engine must deliver to reach a speed of 24.9 m/s at the top of the hill in 15.7 s(NEGLECT frictional losses: air and rolling, ...)
March 1, 2008

physics again it didnt work.
get it right thanks
March 1, 2008

physics again it didnt work.
A moving 1.60 kg block collides with a horizontal spring whose spring constant is 295 N/m. The block compresses the spring a maximum distance of 3.50 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.500. What is ...
March 1, 2008

physics
A man pulls a crate of mass 63.0 kg across a level floor. He pulls with a force of 174.0 N at an angle of 22.0° above the horizontal. When the crate is moving, the frictional force between the floor and the crate has a magnitude of 124.0 N. If the crate starts from rest, ...
February 29, 2008

physics
A moving 1.60 kg block collides with a horizontal spring whose spring constant is 295 N/m. The block compresses the spring a maximum distance of 3.50 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.500. What is ...
February 28, 2008

physics
yep i noticed that =P
February 28, 2008

physics
could i get some help damon
February 28, 2008

physics again...
thanks!
February 28, 2008

physics again...
yeah its still not working i did that i think it wants us to more of an kinetic energy or work method to solve for it.
February 28, 2008

physics again...
they want us to use the height somehow.
February 28, 2008

physics again...
A 62.0 kg diver falls from rest into a swimming pool from a height of 3.50 m. It takes 1.92 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.
February 28, 2008

Science
ok well the elements that are the least reactive are located at the furtherest right side they are called the halogens or the noble gases and the least reactive are on the other side and they are called the alkali metals the non-metals are on the left side and then the metals ...
February 28, 2008

physics
A 62.0 kg diver falls from rest into a swimming pool from a height of 3.50 m. It takes 1.92 s for the diver to stop after entering the water. Find the magnitude of the average force exerted on the diver during that time.
February 28, 2008

physics
A bullet of mass m= 0.0290 kg is fired along an incline and imbeds itself quickly into a block of wood of mass M= 1.55 kg. The block and bullet then slide up the incline, assumed frictionless, and rise a height H= 1.65 m before stopping. Calculate the speed of the bullet just...
February 28, 2008

physics
ha wrong question sorry.
February 28, 2008

physics
i've gotten 41.57 41.92 and 5.68 when i only used the mass of the bullet
February 28, 2008

physics
yeah you wanna do that and tell me what you get or just tell me what you used for the masses because i keep getting wrong.
February 28, 2008

physics
A Princeton prof. (mass = 67.0 kg), surprised by the large stopping force he calculates for jumping flat footed from a height of 0.11 m, decides to try the experiment. Calculate he deceleration (in g's) if he stops in a distance of 0.30 cm. (Do not try this. You could ...
February 28, 2008

Physics
1 false 2 false 3 false 4 false 5 true 6 true that should be right its capa. =]
February 28, 2008

german
technically, god Morgen means good mornings. What you want is guten Morgen
February 27, 2008

PLEASE RESPOND!!
Impurities in the sand Old/contaminated equipment Uncontrolled environment (impurities in the air) Sorry for not posting those before, I suppose that would have been more helpful..Thank you!
February 27, 2008

PLEASE RESPOND!!
Question: hi, i did this lab, from this website and I was wondering if anyone could come up with 3 sources of error, and they can't be human error. Thanks! You are saving me! Seeing as I am not allowed to post to the website :(, search on google liver lab with sand, and it...
February 27, 2008

Labs: Biology 12
Question: hi, i did this lab, from this website and I was wondering if anyone could come up with 3 sources of error, and they can't be human error. Thanks! You are saving me! Seeing as I am not allowed to post to the website :(, search on google liver lab with sand, and it...
February 27, 2008

physics
i dont think the conversion will be necessary because it wants the answer to be in scientific notation
December 21, 2007

physics
still cant get this one? so damon i know you wanna help! or anyone else im open for suggestions haha Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from ...
December 21, 2007

physics
this was what i did and it worked for me ok but the Fb*d the d=0 so that cancels out so i have 83.7(-9.8)(3.2)+30.5(-9.8)(2.25)-Fa(4.5) where the guy weighs 83.7 Kg the board weights 30.5 kg the distance between the saw horses is 4.5 m and Fb of the second saw horse cancels ...
December 20, 2007

physics
its cool the answer is 732.57 N i got it =]
December 20, 2007

physics
A construction supervisor of mass M = 83.7 kg is standing on a board of mass m = 30.5 kg. The board is supported by two saw horses that are a distance of 4.50 m apart. If the man stands a distance x1 = 1.30 m away from saw horse 1 as shown, what is the force that the board ...
December 20, 2007

science
due to natural selection the amount of birds that have lived throughout the 20 year period have been the birds with the bigger beaks because the food they need for survival burrows further into the ground therefor the lengths of the beaks for the birds must accommodate for the...
December 17, 2007

Physics
ok so i solved all that out and it said i was wrong and told me this There are two forces acting on the saw horses. One is due the weight of the board. This is evenly distributed between the two saw horses, because the board is placed symmetrically on them. The other force ...
December 17, 2007

Physics
I still don't quite understand how you got 2.25 meters...
December 17, 2007

Physics
A construction supervisor of mass M = 83.7 kg is standing on a board of mass m = 30.5 kg. The board is supported by two saw horses that are a distance of 4.50 m apart. If the man stands a distance x1 = 1.30 m away from saw horse 1 as shown, what is the force that the board ...
December 17, 2007

physics
yeah didnt understand that hence me posting it again!
December 15, 2007

physics
Three very small spheres are located along a straight line in space far away from everything else. The first one (with a mass of 2.59 kg) is at a point between the other two, 10.50 cm to the right of the second one (with a mass of 5.03 kg), and 20.40 cm to the left of the ...
December 15, 2007

math
Factor 2x²+13x+40 I thought with this sort of problem you are supposed to multipy 40 by 2 and get 80 and then come up with two factors that equal 13. If this doesn't work, you are supposed to factor out a number/variable. Since neither of these methods work, is this ...
November 16, 2006

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