1. Quick calc question

    A particle moves on a line away from its initial position so that after t hours it is s = 4t^2 + t miles from its initial position. Find the average velocity of the particle over the interval [1, 4]. Include units in your answer.

    asked by Mel on January 29, 2016
  2. physics- projectile motion

    A player passes a basketball to another player who catches it at the same level from which it was thrown. The initial speed of the ball is 7.1 m/s, and it travels a distance of 4.6 m. What was (a) the initial direction of the ball and (b) its time of

    asked by Sugarplum on March 14, 2008
  3. physics

    Suppose a soccer player kicks the ball from a distance 28 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be 55° above the horizontal.

    asked by Anonymous on September 14, 2015
  4. Physics

    Suppose a soccer player kicks the ball from a distance 30 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be above the horizontal.

    asked by Drew on January 31, 2016
  5. Chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g) / 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond

    asked by Brenda on January 16, 2011
  6. Chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g) / 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond

    asked by Brenda on January 25, 2011
  7. Chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g)/ 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond

    asked by Brenda on January 16, 2011
  8. Chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g) 200.9 226.7 H2(g) 130.7 0 C2H6(g) - - -84.7 Bond Bond Energy

    asked by Brenda on January 15, 2011
  9. Chemistry

    How would you exactly start the first problem? My thermodynamic skills is a bit rusty. I am assuming I have to use ΔH°f under the given reaction..? But then..we barely covered ΔG° in class. Am I to use this equation, ΔG° = ΔH° - T ΔS°? Umm..can

    asked by Airin on March 27, 2014
  10. Statistics

    12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known

    asked by Amanda on October 24, 2013
  11. Statistics

    12) Allergic reactions to poison ivy can be miserable. Plant oils cause the reaction. Researchers at the Allergy Institute did a study to determine the effects of washing the oil off within 5 minutes of exposure. A random sample of 1000 people with known

    asked by Amanda on October 24, 2013
  12. chemistry

    I was having trouble with this problem. initial pressure for the compounds involved in the reaction displayed were determined to be P(CO(g)) = 0.5794 atm, P(H2O(g)) = 0.5662 atm, P(CO2(g)) = 0.7950 atm, P(H2(g)) = 0.2754 atm. Calculate the value of the

    asked by andy on April 8, 2010
  13. Chemistry

    Volume of reaction flask is 2ml. There are 273 nanomoles of molecular oxygen (O2)/ml of reaction volume at 25*C. What is the amount of atomic oxygen (nanomoles) in the reaction flask?

    asked by Chantèl on March 26, 2013
  14. Biochemistry

    Volume of reaction flask is 2ml. There are 273 nanomoles of molecular oxygen (O2)/ml of reaction volume at 25*C. What is the amount of atomic oxygen (nanomoles) in the reaction flask?

    asked by Chantèl on March 26, 2013
  15. Chemistry

    For the reaction: 2H^+(aq)+Zn(s)----->He2(g)+Zn^2+(aq) a) Write the reduction half-reaction b) Write the oxidation half-reaction c) Identify the oxidizing agent d) Identify the reducing agent

    asked by Anna on April 2, 2014
  16. physics

    A grasshopper jumps a horizontal distance of 1m from rest, with an initial velocity at a 45 degree angle with respect to the horizontal. Find the initial speed of the grasshopper and the maximum height reached.

    asked by zara on September 28, 2014
  17. math

    A particle moves on a line away from its initial position so that after t hours it is s = 6t2 + 2t miles from its initial position. Find the average velocity of the particle over the interval [1, 4]. Include units in your answer.

    asked by Anonymous on May 11, 2015
  18. PHYSICS

    15.0 moles of an ideal gas, at an initial pressure of 3.50 x105 N/m2 and an initial volume of 1.200 m3, undergo a small isothermal expansion to a volume of 1.220 m3. Find the work done by the gas.

    asked by Emma on November 15, 2012
  19. amet

    PART A 1. The acceleration of a body along a straight line is given by (a = 2 (ms-3) t -10 (ms-2). Initial position is 1.8 m and initial velocity is 15 ms-1. Determine the position of the particle, the total distance travelled and the velocity after 12

    asked by noorul on March 17, 2011
  20. physics

    A cannon sends a projectile towards a target 1390m away. The initial velocity makes an angel of 39 degrees with the horizontal. The target is hit. The acceleration of gravity is 9.8m/s^2. what is the magnitude of the initial velocity?

    asked by Anonymous on September 19, 2011
  21. Pre cal

    If a ball is hit with an initial velocity of 110 feet per second at an angle of 45 degrees from an initial height of 2 feet, how far will the ball travel before it hits the ground?

    asked by Anonymous on May 9, 2017
  22. physics

    A baseball is hit at a height of 1.1 m with an unknown initial velocity at 38 ° above the horizontal. It just clears a barrier of height 36.1 m at a horizontal distance of 63.0 m. Find: a) the initial speed;

    asked by Louis on October 7, 2013
  23. physics

    A car has an initial velocity of 20 m/s to the right, 17 seconds later it is seen to be moving at 46 m/s to the left. WHAT DISTANCE DID IT TRAVEL? Does the 17 seconds include the initial 20m/s? If not, how do I find the other distance. If so... What do I

    asked by Debby on August 30, 2014
  24. physics

    A baseball is hit at a height of 1.1 m with an unknown initial velocity at 38 ° above the horizontal. It just clears a barrier of height 36.1 m at a horizontal distance of 63.0 m. Find: a) the initial speed;

    asked by Louis on October 7, 2013
  25. Calculus

    An object has a constant acceleration of 40 ft/sec2, an initial velocity of -20 ft/sec, and an initial position of 10 ft. Find the position function, s(t), describing the motion of the object.

    asked by Niel on June 28, 2018
  26. calc

    An object has a constant acceleration of 30 ft/sec2, an initial velocity of −10 ft/sec, and an initial position of 4 ft. Find the position function, s(t), describing the motion of the object.

    asked by Anonymous on June 29, 2015
  27. math

    Sally made an initial deposit into an account bearing an interest rate of 7% compounded continuously. How long will it take for Sally's initial deposit to double in value?

    asked by Anonymous on March 26, 2014
  28. physics

    A particle has an initial horizontal velocity of 2.9 m/s and an initial upward velocity of 4.5 m/s. It is then given a horizontal accelera- tion of 1.2 m/s2 and a downward acceleration of 1.2 m/s2. What is its speed after 4.9 s? Answer in units of m/s

    asked by Sonia on October 25, 2012
  29. Chem

    COMPOUND 1 CH2 = CH-CH-OH with CH3 under the second CH Plus CH3-CH-CH2-C (double bond O off C and -OH off C) also a CH3 under CH i) complete the equation for this reaction ii) Indentify any new functional groups in the organic product(s)name them iii)State

    asked by Adam on March 12, 2007
  30. Bio

    One way to determine the concentration of protein in a solution is to perform a "protein assay". There are several assay kits on the market that one can use, but they all rely on the common paradigm that the aromatic amino acid residues of a protein

    asked by Josh on June 17, 2006
  31. Chemistry

    In the reaction: P4 (S) +Cl2 (g)PCl5(s), 1. If you have 10.00 grams of Phosphorus to react with 220 grams of Chlorine gas, what would be the theoretical yield of PCl5(s), in grams? 2. Why was there condensation of the beaker of cold water when a blue

    asked by Jerome on December 4, 2010
  32. Chemistry

    100 ml of 15 g/L silver nitrate reacts with an unknown concentration solution of copper (ll) chloride. the reaction for me only 2 grams of silver (l) chloride. If 75 mL of the copper (ll) chloride solution was mixed in, what is the initial concentration of

    asked by Hannah on March 24, 2015
  33. math

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -5t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in meters/sec and “k” is the initial height

    asked by Anne on June 15, 2010
  34. Chem Class

    The equilibrium constant for reaction 1 is K.....? how do i figure out problems like this? do i check which ones cancel out? The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is ___? (1) SO2 (g) + (1/2) O2 (g) (right and

    asked by Awr on October 25, 2010
  35. AP Chemistry

    Q - Aluminum metal reacts with zinc(II) ion in an aqueous solution by the following half-cell reactions: Al(s) → Al3+(aq) + 3e− Zn2+(aq) + 2e− → Zn(s) Predict the potential of the cell under standard conditions. Predict whether the reaction will

    asked by Jessica AP Chemistry on July 6, 2016
  36. compound interest

    How do I solve these problems? Complete the table for a savings account in which interest is compounded continuously. 1. Initial Investment: $1000 Annual % Rate: 3.5% Time to Double: ? Amount After 10 Years: ? 2. Initial Investment: $750 Annual % Rate: ?

    asked by anonymous on December 12, 2007
  37. Organic Chemistry

    Hello, I have done an experiment in Organic Chemistry called :SN1 Reaction: Synthesis of t-amyl chloride from t-amyl alcohol, there are some questions that I am unsure about, 1) What are the 2 rules of HCl in this reaction? Can you use NaCl instead of HCl

    asked by Mohammed on February 29, 2016
  38. "le Chat. principle".

    Hey, can you check this, this is regarding "le Chat. principle". Thanks! #1) The value of the equilibrium constant for the reaction H2CO3(aq) + energy >>> H2O(l) + CO2(g) can be changed by introducing a change to which component of the equation? My answer:

    asked by Dave on July 19, 2006
  39. math- precal

    If a ball is hit with an initial velocity of 110 feet per second at an angle of 45 degrees from an initial height of 2 feet, how long will it be in the air?The following parametric equations are used to represent the location of the ball after t seconds.

    asked by vicky on March 30, 2018
  40. physics

    if the system is a basket, the basket is tied to a rope and it is stopped by a fixed clamp when it is falling down, I know there is initial KE but how come initial work is negative. Isnt force and displacement are in the same direction, so work should be

    asked by eng on May 25, 2010
  41. Chemistry

    Why will a reaction that forms a very weak electrolyte not form an equilibrium reaction? Your preface is questionable. Do you have an example of one? All the weak electrolytes I can think of form in solution an equilibrium reaction. No the question did not

    asked by Chrissy on April 13, 2007
  42. Math

    An observational study is described. Determine the nature and scope of the conclusion the study can reach. In a group of 500 women, those who smoked moderately did worse on tests of reaction time than those who did not smoke. A) Smoking moderately causes

    asked by John on August 28, 2013
  43. physics

    a ball moves up a hill with an initial velocity of 3m/s. four seconds later, it is moving down the hill at 9.0m/s. find the displacement of the ball from its initial point of release

    asked by osama on November 12, 2011
  44. physics

    a ball moves up a hill with an initial velocity of 3m/s. four seconds later, it is moving down the hill at 9.0m/s. find the displacement of the ball from its initial point of release

    asked by osama on November 12, 2011
  45. Physics

    The force acts on a 1.7kg object whose initial speed is 0.44m/s and initial position is x = 0.27. Find the speed of the object when it is a the location x = 0.99m?

    asked by Anonymous on March 31, 2015
  46. Math

    You toss a rock up vertically at an initial speed of 34 feet per second and release it at an initial height of 6 feet. The rock will remain in the air for how many seconds?

    asked by Tane on September 25, 2012
  47. chem

    Is ammonium hydroxide a strong or weak base and how do you know that? Technically there is no such thing as ammonium hydroxide. NH3 gas (ammonia gas) dissolves easily in water and produces the NH4^+ and the OH^- from the reaction with water. It is a weak

    asked by Horacio on May 17, 2007
  48. chemistry

    Based on the following chemical equation, answer the questions below. Show all your calculation The balanced chemical reaction of iodine with hydrogen sulfide is as follows: H2S(g)+I2(s)-----2HI(g) + S(s) (a) Based on the above chemically balanced

    asked by Tasha on October 19, 2012
  49. Chemistry

    Based on the following chemical equation answer the question below show all your calculation The balanced chemical reaction of iodine with hydrogen sulfide h2s(g)+i2(s)-----2HI(g) + S(s) (a) Based on the above chemically balanced equation, how many grams

    asked by Tasha on October 21, 2012
  50. Chemistry

    For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 bar for all species. For the reaction C2H6(g)+H2(g)---->2CH4 the standard change in Gibbs free energy is ΔG° = -32.8 kJ/mol. What is ΔG for this reaction at 298 K when the

    asked by BOB on April 25, 2014
  51. chemistry

    enthalpy change^H is +23kJ mol-1 of phosphine (PH3) for the reaction 2P(s)red+3H2(g)---->2PH3(g) a) Calc. entropy change for this reaction. Explain how this information allows you to determine the spontaneity or non-spontaneity of this reaction at any temp

    asked by harry on February 13, 2013
  52. chemistry

    For the reaction shown below complete the following calculations. H2(g) + C2H4(g) --> C2H6(g) (a) Estimate the enthalpy of reaction using the bond energy values in Table 9.4. (b) Calculate the enthalpy of reaction, using standard enthalpies of formation.

    asked by hannah on October 28, 2008
  53. AP Chemistry

    This is the question I am having trouble with: A voltaic cell consists of a strip of lead metal in a solution of Pb(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode.

    asked by Sarah on April 20, 2015
  54. algebra

    im trying to help my son i have no ida about this stuff any help would be great When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v”

    asked by joni on January 13, 2010
  55. CHEMISTRY HELP ASAP PLEASE!!!!!!!!!!!!!!!

    In the commercial production of the element arsenic, arsenic (II) oxide is heated with carbon which reduces the oxide to the metal according to the following equation: 2As2O3 + 3C ----„³ 3CO2 +4As A>if 8.87 g of As2O3 is used in the reaction and 5.33 g

    asked by john on April 18, 2008
  56. chemistry

    In the commercial production of the element arsenic, arsenic (II) oxide is heated with carbon which reduces the oxide to the metal according to the following equation: 2As2O3 + 3C ----„³ 3CO2 +4As A>if 8.87 g of As2O3 is used in the reaction and 5.33 g

    asked by john on April 17, 2008
  57. chemistry

    aspirin is synthesized through the following reaction C7H603+C4H6O3=C9H8O4=HC2H3O2 a)Assuming the maximum yield that could be obtained is 76.8% what mass of Aspirin C9H8O4 could be obtained from this reaction when 2.00 * 10^2 grams of C7H6O3 reacts with

    asked by jackson on April 24, 2014
  58. chemistry

    Use the following steps to balance the redox reaction below: Mg + Au+ Mg2+ + Au -Write the oxidation and reduction half-reactions. Make sure each half-reaction is balanced for number of atoms and charge. -Multiply each half-reaction by the correct number,

    asked by Adrian on February 9, 2012
  59. chemistry-balanced redox equations

    Use the following steps to balance the redox reaction below: Mg + Au+ Mg2+ + Au a. Write the oxidation and reduction half-reactions. Make sure each half-reaction is balanced for number of atoms and charge b. Multiply each half-reaction by the correct

    asked by princess on March 25, 2012
  60. Chemistry

    Please help me set up these problems. I have been staring at them for hours and I can't tell where I went wrong. Question: Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures.

    asked by Albert on November 17, 2014
  61. chemistry

    For the reaction below,when the reaction when 0.5000g of X13 reacts completely, 0.2360g of XC13 is obtained. Calculate the atomic weight of element Xmas and identify it 2X13 + 3C12--->2C13+312

    asked by Chansa on May 4, 2016
  62. Chem

    Could someone explain to me how to prepare (a) zinc chloride by an acid-base reaction and (b) by a gas formation reaction. If the starting materials available are ZnCO3, HCL, CL2, HNO3, NaCL, Zn(NO3)2, and Zn. Thanks so much for any info.

    asked by Tiff on December 2, 2008
  63. chemistry

    Sulfuric acid is dripped onto samples of three metals: silver, =zinc, and aluminium a) Use the activity series to determine whether a reaction will occur with each metal b) Write a chemical equation for each reaction that occurs

    asked by Michelle on January 11, 2015
  64. chem

    Calculate the number of liters of hydrogen, measured at STP, that can be produced from the reaction of 0.155 mol of aluminum according to the following unbalanced chemical reaction equation. i got .193 L of H2 but it was wrong. i only have one submition

    asked by hannah on December 9, 2010
  65. Physics

    A fast, measured pitched baseball left the pitcher's hand at a speed of 48.6 m/s. The pitcher was in contact with the ball over a distance of 1.44 m and produced constant acceleration. I know that t=(Vf-Vi)/a based on a kinematic equation. Also, I setup:

    asked by Skylar on September 23, 2015
  66. college algebra

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in

    asked by Sherry on January 16, 2010
  67. Chemistry

    When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) delta G= 290.5 Kj/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What

    asked by Angela on January 15, 2014
  68. physics

    a body moves in a straight line with initial velocity and uniform acceleration.find how far it travels in12s,given that it travel 246m in the 1st 6seconds,and 69m in the last 3seconds.find also the initial velocity.

    asked by Fatima on February 13, 2013
  69. Physics

    Find the initial accerleration of a rocket if the sstronauts on board experience eight times their normal weight during an initial vertical ascent. (Hint: In this exercise, the scale force is replaced by the normal force.)

    asked by GY on November 7, 2011
  70. Physics

    A ball is thrown horizontally from a height of 16.01 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? Ok so I got a vertical final velocity of 17.714 m/s. Now I need to find the horizontal speed, correct?

    asked by Lindsay on November 4, 2007
  71. physics

    a body moves in a straight line with initial velocity and uniform acceleration.find how far it travels in12s,given that it travel 246m in the 1st 6seconds,and 69m in the last 3seconds.find also the initial velocity.

    asked by Fatima on February 13, 2013
  72. physics

    a body moves in a straight line with initial velocity and uniform acceleration.find how far it travels in12s,given that it travel 246m in the 1st 6seconds,and 69m in the last 3seconds.find also the initial velocity.

    asked by Fatima on February 13, 2013
  73. algebra

    when a ball is thrown up into the air it makes the shape of a parabola the equation s=-16t^2+v*t+k gives the height nof the ball at any time t in seconds where "v" is the initial velocity (speed)in ft/sec and "k" is the initial height in feet

    asked by angela toliver on August 2, 2010
  74. Chemistry

    A buffer solution A. contains approximately equal amounts of a weak acid and its conjugate base. B. increases its properties with an increase in the concentrations of the two buffer components. C. resists changes in pH. D. all of the above This one is D

    asked by Lili on August 11, 2015
  75. chemistry

    200g of HOCl is placed inside a 3L container and allowed to reach equilibrium. Find the equilibrium concentrations for all species. Given: 2HOCL (g) H20 (g) + Cl20 (g) when Delta H = +56 kJ and Keq = 11.11 at 25 C

    asked by Anonymous on April 9, 2013
  76. Chemistry (Check)

    In a calorimeter experiment done at constant pressure in which all the heat from a chemical reaction was absorbed by the surrounding water bath, the temperature of the water went up by 2.31 K. If the size of the water bath was 200 g, what was the amount of

    asked by Anonymous on November 13, 2015
  77. Chemistry

    I have read Le Chateliers principle but am having a little trouble explaining the effect of pressure and temperature on the equilibrium yield of methanol (CH3OH). Can anyone also tell me the effect of the increase of temp will have on the rate of the

    asked by Bean on March 11, 2007
  78. organic chemistry

    What will be the effect of adding solid NaHCO3 to hot concentrated H2SO4? Why should the reaction vessel containing a synthesized ester be cooled first before neutralization? My Guess #1: Since neutralization is an exothermic process and the ester is in

    asked by PIN on March 1, 2008
  79. chem+Acid-Base Reactions

    Hey..can you check this for me. It has to do with Predicting Acid-Base Reactions. So here it is: I have to: Predict the most likely acid base reaction(s) that occur. For each reaction, state if the reaction is quantitative, or, if not, state whether

    asked by blank on July 25, 2006
  80. algebra

    Library Assignment When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -16t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the

    asked by hilda on January 18, 2010
  81. Differential Equations (Another) Cont.

    For the following initial value problem: dy/dt=1/((y+1)(t-2)) a)Find a formula for the solution. b) State the domain of definition of the solution. c) Describe what happens to the solution as it approaches the limit of its domain of definition. Why can't

    asked by Erica on January 31, 2013
  82. Biology Asap!

    1. A hypothesis and a theory are related because A.a Theory is always used to develop a hypothesis B.They are both developed in the absence of observations. C. the data collected when a hypothesis is tested can support a theory. D. an experiment is done

    asked by 9th grade connections academy on September 26, 2017
  83. ap chemistry

    Some reactions that are predicted by their sign deltaG to be spontaneous at room temperature do not proceed at a measurable rate at room temperature. A suitable catalyst increases the rate of such a reaction. What effect does the catalyst have on deltaG

    asked by kali on February 28, 2008
  84. Environmental Science

    If global energy policies lead to stabilisation of CO2 concentrations at 660 p.p.m., what would the resulting increase in GMST be (to one decimal place)? In subsequent parts of the question this is referred to as the UN’s ‘de facto temperature

    asked by Paul on July 11, 2011
  85. Chemistry

    In 20 s, the concentration of NO2 decreases from 450 mM to 320 mM in the reaction 2 NO2 --> 2 NO + O2 (a) Determine the rate of reaction of NO2 (b) Determine the rate of formation of O2 (c) What is the unique rate of the reaction?

    asked by lawerence on May 2, 2015
  86. chemistry

    A certain reaction has a delta H= -75 kJ and an activation energy of 40 kJ. A catalyst is found that lowers the Activation energy of the forward reaction by 15 kJ. What is the activation energy of the reverse reaction in the presence of this same catalyst?

    asked by josh on March 22, 2010
  87. Chemistry

    I'm reviewing for a test and I'm on Le Chatelier's principle. Decreasing the temperature of an exothermic reaction shifts the equilibrium to the right? I understood this weeks ago but now I can't remember. Wouldn't decreasing the temperature cause there to

    asked by a Canadian on April 9, 2013
  88. chemistry - equilibrium Help

    you observed that very little corrosion occurred on the nail immersed in NaOH(aq) solution. This observation is difficult to explain from an electrochemistry perspective since electrochemistry principles predict a spontaneous reaction that should cause

    asked by Tara on November 13, 2012
  89. physics

    A quarterback throws the football to a stationary receiver who is 22.7 m down the field.The football is thrown at an initial angle of 39◦ to the ground. The acceleration of gravity is 9.81 m/s2 . a) At what initial speed must the quarter- back throw the

    asked by jay on November 27, 2010
  90. college algebra

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -5t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in ft/sec and “k” is the initial height in

    asked by renee on March 29, 2010
  91. Nuclear Physics

    An investigator receives Co-60 (5.27 year half life) for use in a research study. Unfortunately the Co-60 is contaminated with Cs-137 (30.0 year half life). The initial Co-60 activity is 400 times the initial Cs-137 activity. How long after the initial

    asked by amy on February 3, 2011
  92. Physics

    A projectile is launched vertically from the surface of the Moon with an initial speed of 1500. At what altitude is the projectile's speed one-half its initial value?

    asked by Turk on April 28, 2012
  93. AP Physics

    A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?

    asked by Vova on August 18, 2011
  94. physics

    is the height of a ball be thrown directly related to the initial velocity? if i were to graph initial velocity as y and height as x,would it be a linear trend?

    asked by Anthony on January 30, 2017
  95. physics

    A projectile is launched vertically from the surface of the Moon with an initial speed of 1210 m/s. At what altitude is the projectile's speed two-fifths its initial value?

    asked by Cam on April 25, 2014
  96. AP Physics

    A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?

    asked by Vova on August 18, 2011
  97. AP Physics

    A person on a trampoline bounces straight upward with an initial speed of 4.7m/s . What is the magnitude of the person's speed when she returns to her initial height?

    asked by Vova on August 18, 2011
  98. Physics

    A projectile is launched vertically from the surface of the Moon with an initial speed of 1130 m/s. At what altitude is the projectile's speed three-fourths its initial value?

    asked by Emily on November 15, 2009
  99. chemistry

    How long would it take for the concentration of the reactant to drop to one-forurth its initial value? initial concentration of reactant=0.64mol/L half-life=30s

    asked by saud on November 19, 2011
  100. Algebra

    When a ball is thrown up into the air, it makes the shape of a parabola. The equation S= -10t^2 + v*t + k gives the height of the ball at any time, t in seconds, where “v” is the initial velocity (speed) in meters/sec and “k” is the initial height

    asked by Martha on February 19, 2010