Rory

Most popular questions and responses by Rory
  1. 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

    asked on October 18, 2010
  2. 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

    asked on February 17, 2009
  3. 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

    asked on December 28, 2011
  4. geometry

    1)A scale model of a yacht is 15 inches long. The actual length of the yacht is 157.5 feet. How many times as long as the actual yacht is the model? *i think it is 15/157 2)An artist is making a scale model of a statue she has been commissioned to create.

    asked on July 31, 2018
  5. 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!

    asked on December 14, 2008
  6. 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!

    asked on December 14, 2008
  7. 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

    asked on November 21, 2012
  8. 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

    asked on May 16, 2009
  9. 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

    asked on December 9, 2008
  10. 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

    asked on November 30, 2012
  11. 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

    asked on November 21, 2012
  12. 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

    asked on February 29, 2008
  13. 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

    asked on December 7, 2008
  14. 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

    asked on February 28, 2008
  15. 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

    asked on March 1, 2008
  16. 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

    asked on February 27, 2008
  17. 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?

    asked on December 14, 2008
  18. 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

    asked on December 13, 2008
  19. 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

    asked on February 27, 2008
  20. 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

    asked on December 20, 2007
  21. 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

    asked on October 7, 2009
  22. 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

    asked on November 30, 2012
  23. 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

    asked on November 4, 2010
  24. 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

    asked on December 14, 2008
  25. 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:

    asked on March 1, 2008
  26. 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

    asked on February 28, 2008
  27. 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

    asked on February 28, 2008
  28. 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

    asked on December 8, 2009
  29. 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

    asked on December 17, 2007
  30. geometry

    Find the coordinates of A' and D if ABCDE∼A′B′C′D′E′, the center of dilation is F (-6,1), and the scale factor is 3. . A (2,2), B (-2,2), C (-3,4), E (2,5), B' (6,4), C' (3,10), D' (9,19), and E' (18,13). i really need help on this, thank you

    asked on July 31, 2018
  31. 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.

    asked on November 30, 2012
  32. 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?

    asked on November 24, 2012
  33. 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

    asked on November 21, 2012
  34. 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

    asked on December 4, 2011
  35. 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

    asked on October 4, 2011
  36. 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.

    asked on February 28, 2008
  37. 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

    asked on December 21, 2007
  38. 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

    asked on November 30, 2012
  39. 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

    asked on November 24, 2012
  40. 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^+?

    asked on November 13, 2010
  41. algebra

    (-3x+4)+(x tothe 2nd power +x-5)

    asked on May 15, 2010
  42. 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

    asked on March 16, 2009
  43. english

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

    asked on January 11, 2009
  44. 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.

    asked on March 1, 2008
  45. 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

    asked on December 15, 2007
  46. 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

    asked on November 16, 2006
  47. 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.

    asked on March 11, 2014
  48. Math

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

    asked on April 13, 2011
  49. 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.

    asked on February 28, 2008
  50. Math

    What is the least number that is both a multiple of 35 and a multiple of 20?

    asked on March 6, 2014
  51. 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!

    asked on October 2, 2012
  52. Sose

    Hi there i am 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

    asked on March 8, 2009
  1. math

    12

    posted on March 7, 2018
  2. Social studies

    hw helper is correct

    posted on March 1, 2017
  3. Social studies

    Yeetballer33 and Anza are correct

    posted on February 16, 2017
  4. American government

    Oh my god, this entire comment section went to hell. I don't even know whose answer to trust at this point...

    posted on September 27, 2016
  5. Stats

    301

    posted on July 16, 2016
  6. englise

    What kind of complement is the underlined word? Some sharks have no natural enemies. A. predicate nominative B. direct object C. predicate adjective D. indirect object

    posted on January 20, 2016
  7. Math

    Haha me and Rory r having a hard time of this we go to the same school

    posted on March 6, 2014
  8. Physics

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

    posted on January 6, 2012
  9. Chemistry

    i ended up with x=.28 and i multiplied it by 2 and it was not the right answer

    posted on November 4, 2010
  10. 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

    posted on February 17, 2009
  11. 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! :)

    posted on February 17, 2009
  12. math

    Change 72 inches into feet: 72/12 = 6 ft 6 X 8 = 48 square feet

    posted on February 17, 2009
  13. english

    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?

    posted on January 11, 2009
  14. physics help

    i didn't get that....

    posted on December 14, 2008
  15. physics

    ohh... nevermind!

    posted on December 14, 2008
  16. physics

    but.. what formula do i use?

    posted on December 14, 2008
  17. physics

    thanks

    posted on December 14, 2008
  18. physics

    thank you

    posted on December 14, 2008
  19. us history

    thanks!

    posted on December 13, 2008
  20. physics

    thanks!

    posted on December 7, 2008
  21. physics

    yeah you were right thanks.

    posted on March 1, 2008
  22. physics again it didnt work.

    get it right thanks

    posted on March 1, 2008
  23. physics

    yeah the only thing you did wrong was the final answer it should be 34.72E3 W

    posted on March 1, 2008
  24. physics again...

    thanks!

    posted on February 28, 2008
  25. physics

    yep i noticed that =P

    posted on February 28, 2008
  26. physics

    could i get some help damon

    posted on February 28, 2008
  27. 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.

    posted on February 28, 2008
  28. physics again...

    they want us to use the height somehow.

    posted on February 28, 2008
  29. 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

    posted on February 28, 2008
  30. physics

    ha wrong question sorry.

    posted on February 28, 2008
  31. physics

    i've gotten 41.57 41.92 and 5.68 when i only used the mass of the bullet

    posted on February 28, 2008
  32. 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.

    posted on February 28, 2008
  33. Physics

    1 false 2 false 3 false 4 false 5 true 6 true that should be right its capa. =]

    posted on February 28, 2008
  34. german

    technically, god Morgen means good mornings. What you want is guten Morgen

    posted on February 27, 2008
  35. 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!

    posted on February 27, 2008
  36. physics

    i don't think the conversion will be necessary because it wants the answer to be in scientific notation

    posted on December 22, 2007
  37. 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

    posted on December 21, 2007
  38. physics

    its cool the answer is 732.57 N i got it =]

    posted on December 20, 2007
  39. 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

    posted on December 17, 2007
  40. 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

    posted on December 17, 2007
  41. Physics

    I still don't quite understand how you got 2.25 meters...

    posted on December 17, 2007
  42. physics

    yeah didn't understand that hence me posting it again!

    posted on December 15, 2007