1. Physics

    A metal ball tied to the end of a string 1.8 m long is whirled in a horizontal circle at 4 m/s. What is the mass of the ball if the tension on the string is 30 N? What formula/s should I use?

    asked by Fey on September 13, 2015
  2. math

    the formula for potential energy is p= mgh, where Pis potential energy, m is mass, g is gravity, and h is height. which expression can be used to represent g? 1 p-m-h 2 p-mh 3 p/m0-h 4 p/(mh)

    asked by Anonymous on May 7, 2009
  3. Chemistry

    Hello, I am looking just for someone to tell me how I go about doing this problem, ie. the formula that i would need to know for it. I would really like to figure it out on my own but I'm not sure how to. The mass ratio of Kr to F in a particular compound

    asked by kathryn on September 30, 2010
  4. Physics ~MOMENTUM~

    a) what is the momentum of a 4.6 kg baseball moving at 1.4 m/s? b) a child is running with a velocity of 4.5 m/s and has a momentum of 120 kgm/s. What is the child's mass? ~formula~ P=mv help please!!!

    asked by Isis on February 16, 2013
  5. Chemistry

    Can somebody check my answers? I Failed this test one time already. I do not want to fail it again. 1. When a pair of electrons is shared between two atoms, a covalent bond is said to have formed. Most often, the pair is formed A. by excess valence

    asked by Amanda on August 26, 2011
  6. Statistics

    Use the Empirical Rule to find what two values 95% of the data will fall between for a data set with a mean of 294 and standard deviation of 13.

    asked by Denise on May 16, 2011
  7. Astronomy

    We can calculate the kinetic energy of any moving object with a very simple formula: kinetic energy = 1/2 mv^2 ,where m is the object's mass and v is its velocity or speed. Table Energy Comparisons shows that metabolizing a candy bar releases about 10^6

    asked by Isabelle on October 19, 2010
  8. Statistics

    Quick Normal/InvNormal Calculator In a study of human mortality rate, an Actuary estimated that in US and Canada, about 78% (fictional figures) of life insurance claims resulted from accidental deaths. Suppose a study is being planned to estimate the

    asked by Nina on November 17, 2010
  9. Chemistry 219

    An amount of 1.250g of an alloy (90% Ag, 10% Cu) was treated with HNO3 and H2SO4 to form Ag2SO4 and CuSO4. The solution was then treated with Cu wire to precipitate silver. The resulting solution was treated with excess zinc to precipitate copper. (show

    asked by Anonymous on February 8, 2011
  10. science

    1) When an alkali metal is involved in a chemical reaction with a nonmetal, what charge will its atoms most likely form? 1- 2+ 1+ 2- 2) Which properties increase when moving down a group of the periodic table? Select all that apply. reactivity valence

    asked by help me please on December 11, 2018
  11. Physics(Please help, thank you)

    I had to do an experiment where a tiny steel ball was measured using a micrometer. There was then a series of calculations that needed to be completed and then a percent error had to be calculated. I think that my data may be incorrect or maybe I am just

    asked by Hannah on August 30, 2012
  12. physics

    A box drops down from a small height onto a horizontal conveyor belt. The mass of the box is 95 kg. The belt moves with speed 1,4 m/s. The coefficient of sliding friction between the box and the belt is 0,42. How long does it take for the box to come to

    asked by Anonymous on February 13, 2012
  13. CHEM

    The mass of an electron is 9.11*10^-31kg. If the de Broglie wavelength for an electron in a hydrogen atom is 3.31*10^-10m, how fast is the electron moving relative to the speed of light? The speed of light is 3.00*10^8m/s. Express your answer numerically

    asked by K on November 4, 2007
  14. Physics

    A 41.2-kg boy, riding a 2.57-kg skateboard at a velocity of +5.82 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.12 m/s, 9.72° above the

    asked by noodle on March 3, 2013
  15. Physics

    *62. A 40.0-kg boy, riding a 2.50-kg skateboard at a velocity of +5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 9.50° above the

    asked by Cornelius on November 11, 2010
  16. Physics

    A 41.2-kg boy, riding a 2.57-kg skateboard at a velocity of +5.82 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.12 m/s, 9.72° above the

    asked by noodle on March 3, 2013
  17. Physics

    *62. A 40.0-kg boy, riding a 2.50-kg skateboard at a velocity of +5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 9.50° above the

    asked by Cornelius on November 11, 2010
  18. Physics

    A 38.0-kg boy, riding a 2.37-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.06 m/s, 10.35° above the

    asked by Steven on October 15, 2014
  19. English

    Let's work in pairs. Say the specialty of your friend you know well to your partner. Use the following pattern. * I have a friend who ___________. For example, if one of your friends swims very well, say to your partner,"I have a friend who can swim very

    asked by Tom on October 26, 2009
  20. physics

    How many uniform, identical textbooks of width 25.0 cm can be stacked on top of each other on a level surface without the stack falling over if each successive book is displaced 3.00 cm in width relative to the book below it? If the books are 5.00 cm

    asked by melissa on January 16, 2011
  21. Henderson-Hasselbalch

    If the same volume (130-mL) of the buffer were 0.265 M in NH3 and 0.400 M in NH4Br, what mass of HCl could be handled before the pH fell below 9.00? I used the henderson-hasselbalch equation to solve this. i set it up as

    asked by Kyle on March 28, 2010
  22. Chemistry

    If the same volume (130-mL) of the buffer were 0.265 M in NH3 and 0.400 M in NH4Br, what mass of HCl could be handled before the pH fell below 9.00? I used the henderson-hasselbalch equation to solve this. i set it up as

    asked by Kyle on March 28, 2010
  23. Chemistry

    1. Which of the following is one way to prevent the corrosion of iron? A. Paint exposed iron parts with protective paint. B. Protect the iron from polluted air. C. Add carbon to the iron. D. Let the iron develop a natural coat of carbonate. 2. The source

    asked by StarBuddy on October 3, 2013
  24. Chemistry - please help-thanks

    Posted by anne on Saturday, October 15, 2011 at 1:03am. Hi, Please advise on the following: - A procedure for the determination of Impurities A & B in a compound says to use a 4.6 x 150mm x 3um column (stationary phase: octadecylsilyl silica gel). The

    asked by anne on October 15, 2011
  25. physics

    Using Newton's Law of Universal Gravitation, compare the gravitational pull of the Sun on the Earth to the gravitational pull of the Moon on the Earth. Constants: Mass of the Moon, M☽= 7.348E22 kg. Moon's semi-major axis, a☽= 3.844E8 m. You can find

    asked by Maria on November 16, 2011
  26. chemistry

    Can specific heat be negative? I know energy can be (as in joules or calories) because when something cools down the temperature difference is a negative, and because the energy is an important part of the formula for specific heat, couldn't it be

    asked by Fido on October 22, 2006
  27. chemistry

    A 10.0L flask contains 3.0atm of ethane and 8.0 atm of oxygen at 28 degrees C. The contents of the gas are reacted and allowed to return to 28 degrees C. What is the pressure of the flask? Using n=RT/PV I converted atm to moles and then used the balanced

    asked by TJ on December 8, 2011
  28. Chemistry

    Complete the following table for aqueous solutions of caffeine, C8H10O2N4. a) molality b) mass percent solvent c) Ppm solute All we're given is Mole fraction solvent= .900. How do I solve for the other parts with only this?? It XH2O = 0.9, then

    asked by Chris on March 20, 2007
  29. science

    I need help to find the answer to this problem: The formula for aluminum sulfate is Al2(SO4)3. Figure the molar mass of aluminum sulfate to the nearest gram?

    asked by wizzkid01 on December 16, 2008
  30. chemistry

    When 3.761g of a hydrate of strontium chloride is heated to 60 degree C it forms strontium chloride dihydrate of mass 2.746g What is the formula of the original sample?

    asked by aryan on June 8, 2011
  31. chem

    A sample of an alcohol is tested and found to contain 52% carbon, 35% oxygen, and 13% hydrogen by mass. Tests indicate that the molecular weight of the molecule is between 30 and 80. What is the molecular formula of the alcohol?

    asked by greeny on August 19, 2012
  32. College Physics

    A uniform ladder of mass, m, and length, l, leans at an angle, theta, against a frictionless wall. Determine a formula for the minimum angle at which the ladder will not slip.

    asked by Andrew on April 20, 2013
  33. Chemistry

    How many neutrons in carbon-12 and how did you get yuor answer The atomic number is the number of protons. Look for element number 6 on the periodic table and see carbon. For carbon, there are 6 protons. # protons + # neutrons = mass number 6 + # neutrons

    asked by Schooler on October 15, 2006
  34. ship problem

    A [B]ship P [/B] is travelling due [B]East at 30 km/h[/B] and a [B]Ship Q[/B] is travelling due [B]South at 40 km/h. [/B] Both ships keep constant speed and course. [B]At t=0 they are each 10 km [/B] from the point of intersection of their courses and

    asked by rav on July 15, 2006
  35. chemistry

    I have two problems that I'm stumped on. I know the correct anwers but I'm having problems coming up with the co rrect anwsers. Here are the problems: 1) Magnesium has a density of 1.7g/cm^3 and iron has density of 7.9 g/cm^3. A block of iron has a mass of

    asked by pat on September 29, 2007
  36. chemistry

    Is this correct? A 0.1471 g sample of a compound containing C, H, and F was burned to produce 0.1960 g CO2 and 0.08024 g H2O. If the molar mass of the compound was determined to be approximately 66.05 g/mol, what is its molecular formula? My answer is:

    asked by mark on January 21, 2012
  37. physics

    A car with a mass of 1000kg is travelling at a constant velocity. The force from the engine is 200Newtons. Calculate the acceleration of the car using the formula f=ma. How long will it take this car to travel 0-60 mph (n.b. 1mph = 0.45m/s)

    asked by j on May 16, 2013
  38. College physics 1

    A 40.0-kg boy, riding a 2.50-kg skateboard at a velocity of +5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 9.50o above the

    asked by Bren on March 30, 2010
  39. Physics

    A 39.2-kg boy, riding a 2.39-kg skateboard at a velocity of +4.97 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.48 m/s, 9.54° above the

    asked by Jamie on June 30, 2013
  40. physics

    A 43.0-kg boy, riding a 2.20-kg skateboard at a velocity of 5.30 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 8.00° above the

    asked by brad on April 19, 2016
  41. PHYSICS

    the consumption of natural gas by a company satisfies the empirical equation V= 1.5t + 0.008t^2 where V is in volume in millions of cubic feet and t is the time in months. what are the dimensions of the constants 1.5 and 0.008?

    asked by ANN on November 21, 2011
  42. college math

    During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, and 13 people. Use this information to determine the empirical probability that the next call will be answered in person.

    asked by Rose on December 10, 2007
  43. physics

    A billiard ball of mass 0.16 kg has a speed of 1.80 m/s and collides with the side of the billiard table at an angle of 34.6°. For this collision, the coefficient of restitution is 0.841. What is the angle relative to the side (in degrees) at which the

    asked by sara on February 9, 2012
  44. chemistry

    Block A of an unknown metal has a volume of 125 cm3. Block B of a different metal has a volume of 145 cm3. If block A has a greater mass than block B, what can be said of the relative densities of the two metals? (Assume that both blocks are solid.)

    asked by lexie on September 1, 2014
  45. physics

    The mass of a carbon atom is 2 x 10 ^ -26. What is the kinetic energy of a carbon atom moving with a speed of 500 m/s? What is the formula I would need?

    asked by Julia on November 30, 2009
  46. math

    the formula for potential energy is p=mgh, where p is potential energy, m is mass, g is gravity, and h is height. what expression can be used to represent g?

    asked by derek on May 30, 2008
  47. math,algebra

    can someone help me out factor out this 0=16t^2-122t+180 i have so far this but the last one i am not sure 8(2t^2-14t + ?) you need to use the quadratic formula: -b(+or-)[sqrt(b^2-4ac)/2a] so you are saying that i don't have to factor it out any further i

    asked by jasmin20 on April 6, 2007
  48. Physics

    As your bus rounds a flat curve at constant speed, a package with mass 0.300 , suspended from the luggage compartment of the bus by a string 46.0 long, is found to hang at rest relative to the bus, with the string making an angle of 30.0 with the vertical.

    asked by dalke on July 3, 2011
  49. One more A.P Chemistry

    Three volatile compounds X,Y, and Z each contain elements Q. The precent by weight of element Q in each compound was determined. Some of the data obtained are given below Percent by weight Molecular Compound of Element Q Weight X 64.8% ? Y 73.0% 104. Z

    asked by Brianna on October 24, 2006
  50. college chemistry

    Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

    asked by anne on October 15, 2012
  51. chemistry

    Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

    asked by claire on October 15, 2012
  52. CHEMISTRY

    An analysis of a compound gave 40% carbon 3.7% hydrogen. the vapour density of the compound is 30. calculate the empirical and molecula fomular.

    asked by NEMUEL on November 17, 2015
  53. grammar

    Indicate whether each of the following pronouns (in parentheses) is demonstrative, interrogative, indefinites, or relative. 1. Was Macduff the one (who) discovered the murdered king? relative 2. (Who) else went to the king's chamber? interrogative 3.

    asked by anonymous on November 4, 2007
  54. Physics 111

    A boat is crossing a river. The velocity of the boat relative to the water is 4.0 m/s directed perpendicular to the river's current. The velocity of the current relative to the shore is 2.0 m/s. How long will it take for the boat to cross the river?

    asked by Hannah on September 13, 2015
  55. Physics

    A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

    asked by Lori on February 23, 2013
  56. College Physics PLEASE HELP

    A spring stretches 0.150 m when a 0.30 kg mass is hung from it. The spring is then stretched an additional 0.100 m from this equilibrium point and released. Determine a). the spring constant, k, b). the maximum velocity of the mass, c. ) the maximum

    asked by Lori on February 23, 2013
  57. Psychology Statistics

    2 For a sample of n = 20 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with  = .05? 3 The Pearson correlation is calculated for a sample of n = 25 individuals. What value of df should be

    asked by Chioma on April 26, 2013
  58. Chemistry

    An industrial raw materials as the following composition by mass : iron = 28.1% chlorine = 35.7% and water of crystalization = 36.2%. Calculate the formula for the material given that Hydrogen is 1, oxygen is 16, chlorine is 35.5 and iron is 56.

    asked by Christy on January 12, 2019
  59. chemistry

    What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the unit! (gram formula mass of solute = 24 g)

    asked by archie on September 30, 2011
  60. chemistry

    What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the unit! (gram formula mass of solute = 24 g)

    asked by archie on September 30, 2011
  61. physics

    A curling rock with a mass of 20.0kg slides down a sheet of ice at a speed of 60.0 m/s. What is the kinetic energy of the curling rock? Uhmm, i think the formula is.. Ek= 1/2mv2 Solve?

    asked by chyanne on April 29, 2008
  62. Algebra 2

    Can someone please explain how to do this problem? A regional soccer tournament has 64 participating teams. In the first round, the number of games played decreases by a factor of one half. Find a rule for the number of games played in the regional soccer

    asked by Jane on February 24, 2014
  63. physics

    a)a box having mass of 500kg is placed on a horizontal surface.find the pressure exerted on the surface?do not forget to write formula. b)a pond of water filled with water upto 60m.1)write formula to find the pressure of water exerted on the base of

    asked by sweetie on November 24, 2010
  64. Math

    Beginning at age 35, Ms. Trinh invests $4000 each year into an IRA account until she retires. When she retires she plans to withdraw equal amounts each year that will deplete the account when she is 80. Find the annual amounts she will receive for each of

    asked by Lena on March 13, 2015
  65. chemistry

    unknown element X combines with oxygen to form the compund XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X? X + O2 ==> XO2 8.00 g x (1 mol O2/32 g O2) = 0.25 mol O2. 44.0 g element X must represent

    asked by alexa on April 29, 2007
  66. chemistry

    what is the oxidation half reaction, reduction half reaction, and the complete balanced reaction of the following? (a) Al(s) + MnO4‾(aq) → MnO2(s) + Al(OH)4‾(aq) (b) Cl2(g) → Cl ‾(aq) + ClO ‾(aq) (c) NO2‾(aq) + Al(s) → NH3(g) + AlO2‾(aq)

    asked by Anonymous on October 28, 2010
  67. Science

    Consider a neutral atom that has 17 electrons A.) how many protons does it have? B.) what is it's atomic number? C.) which element is it?

    asked by Tessa on February 18, 2014
  68. chemistry

    3.429 X2 (SO4)3 contains 0.12 mol of oxygn tom.what is the atomic wight of x?

    asked by faisal on December 18, 2011
  69. science

    please draw an atomic diagram showing electrons in different energy levels LI + N = MG + F = NA + F = AL + O = LI + O = K + S = MG + O =

    asked by kingsley on January 17, 2015
  70. math

    give diameter of the atomic nucleus of lead atom is 1.75x10m

    asked by adlfa on December 6, 2017
  71. physical science

    What physical quantities are governed by the quantum numbers of an atomic electron?.

    asked by Dee on March 22, 2013
  72. chemistry

    What are the materials used to create a free standing atomic model of iodine?

    asked by Mimi on January 3, 2012
  73. math

    what is diameter of the atomic nucleus of a lead atom is 1.75x10 negative15m

    asked by angel laica baa on November 19, 2015
  74. sci

    explain why most isotopes of elements with a high atomic number are radioactive??

    asked by ashley on October 30, 2008
  75. Math

    A dipole of 1 Debye is equal to 3.33 x 10^-30 C m . Show that in atomic units 1 D = 0.39345 au.

    asked by Adam on April 14, 2013
  76. Chemistry

    Explain how shielding contributes to the atomic radius trend within a group.

    asked by Nick on November 10, 2010
  77. Chemistry

    How does the outer energy level(period)relate to the atomic radius?

    asked by Sandy on November 30, 2010
  78. CHEM

    How does the neutron to proton ratio affect the stability of an atomic nucleus ?

    asked by NILA on February 24, 2012
  79. Conversion Math

    A dipole of 1 Debye is equal to 3.33 x 10^-30 C m . Show that in atomic units 1 D = 0.39345 au.

    asked by Taylor on April 14, 2013
  80. Chemistry

    Then, do isotopes have different atomic radii? since they all have different numbers of neutrons. Even if they only differ by 10^-23 m, there is still some diff right?

    asked by Kurst on February 29, 2008
  81. Chemistry

    What is the trend in atomic size in the series of Group IIA elements Be through Ra?

    asked by Tom on November 14, 2011
  82. Chemistry

    What are the atomic ratios of Berylium, Magnesium, Silicon, Chlorine and Calcium?

    asked by Stephan on January 16, 2018
  83. chem

    what colored lines are expected in the atomic emission spectrum for mercury?

    asked by natash on April 14, 2008
  84. chemistry

    How is collaboration necessary and important for scientific advancement. use examples from the atomic theory please help

    asked by Anonymous on August 25, 2017
  85. Social studies

    Against what country was the atomic bomb used? A)Japan B)France C)Europe D)Russia

    asked by Lea on October 31, 2015
  86. Science

    If neons atomic number is 10 how many electrons are in the outer energy level?

    asked by Melissa on June 10, 2010
  87. Chemistry

    consider a neutral atom with 69 protons and 80 neutrons what is the atomic number of this element

    asked by christine on September 29, 2010
  88. physical science

    How is an isotope and a nuetron related? how is an atomic number and a proton realted?

    asked by liz on November 3, 2007
  89. CHEM

    Arrange the following in order of increasing atomic radii from smallest to largest. Mg Ra Sr Be Ca Ba

    asked by Lena on October 18, 2012
  90. history

    can someone help me find evidence to why the atomic bomb should not have been dropped in Hiroshima and Nagasaki?

    asked by peter on January 11, 2008
  91. Chemistry

    Sample A: Solid appearance:crystals, solids, white Solid Conductivity:no Solubility: soluble Solution appearance:substance disappears slowly Solution Conductivity: yes Relative melting point:2nd Sample B: Solid appearance:brown, tiny solids, dirt

    asked by Sarah on November 16, 2016
  92. Physics

    1.The mass of a string is , and it is stretched so that the tension in it is 180 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string? 2.A rocket engine emits of sound energy

    asked by Jena on December 6, 2006
  93. PHYSICS

    Consider holding a carton of milk in your hand, as shown in the image. The force of the bicep muscle acts at an angle of 15 o to the vertical, while the weight of the arm and the milk both act downwards. The distance from the elbow to where the bicep

    asked by GEORGE on July 9, 2015
  94. Chemistry

    Can you tell me if these are right please? When 2.50g of copper reacts with oxygen the copper oxide product has a mass of 2.81g. What is the simplest formula of the copper oxide. I got Cu2O (copper (I) oxide). Aluminum and oxygen gas react to produce

    asked by Jason on October 19, 2010
  95. Physics

    A boat crosses a river of width 113 m in which the current has a uniform speed of 0.933 m/s. The pilot maintains a bearing (i.e., the direction in which the boat points) perpendicular to the river and a throttle setting to give a constant speed of 2.58 m/s

    asked by Karen on January 28, 2013
  96. chemistry

    if the rms speed of NH3 molecules is found to be 0.510 km/s what is the temperature (in Celcius)? can someone solve this using the formula c=((2.55*R*T)/M)^1/2 c is the speed r is 8.314 constant M is the molar mass of NH3 17.031

    asked by Henry on August 5, 2011
  97. Chemsitry

    What is the pH of the buffer solution that results when 58.50 g of sodium acetate (NaCH3CO2) (Formula Mass = 82.02 g mol-1) is added to 1 litre of 0.45 mol L-1 acetic acid (CH3CO2H) ? Data: Ka for CH3CO2H = 1.8 x 10-5

    asked by Sue on April 20, 2015
  98. Math: Direct Variation

    I really don't get direct variation and I took a test on it and bombed it but now I can correct it so if anyone can just explain it to me I'd be really grateful. :) Generally, direct variation means that as one of the variables assumes increasing positive

    asked by Somebody on September 21, 2006
  99. Science

    An aluminium cube measures 10 cm on each side. The density of aluminium is 2.7g/cm–³. What is the cube's mass? I need help regarding the formula.

    asked by Jr on June 11, 2017
  100. statistics

    do we need to calculate z in order to use the critical value like we did when we calculated the p value?

    asked by Help on January 20, 2014

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