1. physics

    The initial velocity of a 1.55 kg block sliding down a frictionless inclined plane is found to be 1.27 m/s. Then 1.07 s later, it has a velocity of 5.37 m/s. What is the angle of the plane with respect to the horizontal?

    asked by sam on February 12, 2014
  2. Physics

    An object is thrown upwards at an initial speed of 19.6m/s from a height of 55m. How long will it take for the object to reach the ground.(from the time it was thrown)

    asked by Derp on August 22, 2012
  3. math

    an initial population of 865 quail increases at a annual rate of 15%. write an exponential function to model quail population

    asked by nick on February 20, 2014
  4. Physics

    A quantity of monatomic ideal gas expands adiabatically from a volume of 2.0 liters to 6.0 liters. If the initial pressure is P0, what is the final pressure?

    asked by Alex on February 13, 2013
  5. Calculus

    The position of a particle moving along the x-axis as a function of time,t, is given by x(t)=(1/6)t^3-t^2+3t-1 for t≥0. The particle's velocity becomes three times its initial velocity when t=? I know v(t)=x'(t)=(1/2)t^2-2t+3=9, but I do not understand

    asked by Mike on March 2, 2017
  6. Chemistry

    Cyclopropane is converted to propene in a first-order process. The rate constant is 5.4 × 10-2 hr-1. If the initial concentration of cyclopropane is 0.150 M, what will its concentration be after 22.0 hours?

    asked by Ericka on December 11, 2009
  7. physics

    You throw a ball vertically from an apartment balcony to the ground 14.2 m below. Find the ball's initial velocity if it hits the ground 1.08 s after you release it.

    asked by squad on October 1, 2013
  8. Solution Stoichiometry

    If 75.0 mL of an AgNO3 solution reacts with enough Cu to produce .25g Ag by single displacement, what is the molarity of the initial AgNO3 solution if Cu(NO3)2 is the other product?

    asked by Anonymous on March 29, 2009
  9. physics please help

    A soccer ball is kicked from the top of a 256 -foot building with an initial velocity of 6 ft/s. How far from the base of the building will the ball land?

    asked by carissa on October 19, 2008
  10. Physics

    A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 17 m/s. If the brick is in flight for 3.3 s, how tall is the building? m

    asked by Crown on September 12, 2012
  11. Math, Science

    A woman throws a 0.25 kg ball straight up in the air with a initial speed of 15 meters per second. how far above the woman will the ball go before it starts coming back down?

    asked by Wyatt Bendickson on April 2, 2015
  12. Chemistry

    Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a sample of Radium-223 to decrease to 1.00% of its initial value?

    asked by Michelle on March 1, 2013
  13. chemistry

    What is the final pressure gas sample that is subjected to a temperature change from 22.0 C to 30.0 C and a volume change from 85.4 L to 37.0 L with an initial pressure 105 kPa?

    asked by SK on May 1, 2013
  14. Biology

    The half -life of carbon-14 is 5,730 years.how much of an initial amount of this substance would remain after 17,190 years(3 Half-lifes

    asked by Eileen on November 23, 2010
  15. physics

    A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 2.5 s, how tall is the building?

    asked by Anonymous on September 25, 2010
  16. science

    A balloon with an initial volume of 2.8L at a temperature of 296K is warmed to 375K . What is its volume at the final temperature? (Assume constant pressure.)

    asked by michelle on October 22, 2012
  17. physics

    a stone is thrown vertically upward with an initial velocity u from the top of tower, reaches the ground with a velocity 3u. what is the height of tower?

    asked by pavatharani on July 13, 2011
  18. Physics

    Two identical objects of the same mass and at the same initial temperature cool off. If object A cools off faster than object B, what can you say about the specific heats of the two objects?

    asked by Anonymous on January 14, 2015
  19. Physics

    A 5 gm bulet initial velocity is 300ms-1 and after penetrating a 5cm plank then the bulet stopped . So how much time is needed to penetrate the plank..?

    asked by Alvi on November 23, 2016
  20. physical science

    a motorcycle has a mass of 2.50*1000 kg. a constant force is exerted on it for 60.0 s. The motorcycle's initial velocity is 6.00 m/s and its final velocity 28.0 m/s. What is its change in momentum?

    asked by Anonymous on September 26, 2011
  21. Physics

    A cork shoots out of a champagne bottle at an angle of 39.0 degrees above the horizontal. If the cork travels a horizontal distance of 1.10 m in 1.40 s, what was its initial speed?

    asked by Abby on February 16, 2010
  22. physics

    A brick is thrown upward from the top of a building at an angle of 15° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 2.8 s, how tall is the building?

    asked by Claudia on September 28, 2010
  23. physics

    A 240 g ice cube at -10 C is placed in an aluminum cup whose initial temperature is 70 C. The system comes to an equilibrium temperature of 20 C. What is the mass of the cup?(answer in kg)

    asked by ana on December 2, 2009
  24. physics

    A marble is thrown vertically downward at an initial velocity 200cm/s hits the floor in 2.5 seconds ,At what height is the marble thrown?

    asked by happy on July 15, 2015
  25. MATH

    a drug has a half life of 5 hours. write the exponential function that gives the concentration of the drug over time assuming an initial concentration of 2 mg/ml

    asked by Matt on September 22, 2016
  26. physics

    A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 14 m/s. If the brick is in flight for 3s, how tall is the building?

    asked by TNT on February 17, 2018
  27. physics

    Charlie now moved onto the next hole where he hit the ball with an initial speed of 30 m s-1 and at an angle of 60 degrees. This time the ball lands with a speed of 17.3 m s-1. Use g = 9.8 m s-2.

    asked by qwdsadasd on December 16, 2016
  28. Math

    An object is launched upward from the ground with an initial vertical velocity of 40 feet per second. After how many seconds does the object reach a height of 25 feet?

    asked by Amy on April 19, 2013
  29. PHYSICS

    Charlie now moved onto the next hole where he hit the ball with an initial speed of 30 m s-1 and at an angle of 60 degrees. This time the ball lands with a speed of 17.3 m s-1. Use g = 9.8 m s-2.

    asked by PHYSICS on December 16, 2016
  30. physics

    a ball is thrown upward with an initial velocity. What is it's velocity to halfway to its highest point? the answer is the square root of 2, but how do u get that answer?

    asked by Anonymous on October 19, 2008
  31. Physics

    A body is moving with uniform acceleration covers 100m in the first 10s and 150m in the next 10s. Find the initial velocity of the body.

    asked by BHAVIN on May 18, 2017
  32. Physics, newtons laws

    A bullet is fired with a certain velocity at an angle above the horizontal at a location where g= 10.0 m/s^2. The initial x any components of its velocity are 86.6 m/s and 50 m/s respectively. How long does it take before the bullet hits the ground?

    asked by Naf on October 29, 2012
  33. physics

    A brick is thrown upward from the top of a building at an angle of 10° to the horizontal and with an initial speed of 11 m/s. If the brick is in flight for 2.8 s, how tall is the building?

    asked by mel on February 10, 2010
  34. phy

    A baseball is thrown horizontally from the top of a cliff 50 meters up. The initial velocity of the ball is 10 m/s. How far from the base of the cliff will the ball land?

    asked by Anonymous on March 5, 2014
  35. Physics

    A stone is tossed upward at the moment a ball is dropped from a height of 25 meters. The stone's initial velocity is 25 m/s. At what height will the two meet?

    asked by Gigz on June 20, 2017
  36. physic

    A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)

    asked by mark on February 3, 2016
  37. physics

    A metal sphere is launched with an initial velocity of 1.5 m/s as it leaves the ramp. The end of the ramp is 1.2 m above the floor. Calculate the range of the sphere.

    asked by Christian on October 14, 2014
  38. physics

    A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.30 and the push imparts an initial speed of 4.0 m/s?

    asked by KatieC on October 18, 2010
  39. Chemistry

    The half life of a radioactive material is 120 months. How much of this material will be left after 350 months if the initial concentration is 2.40M?

    asked by Kay on May 1, 2017
  40. physics

    a ball is thrown vertically into the air because of air resistance its speed when it returns to its staring level compared to it initial speed is what?

    asked by Anonymous on February 6, 2011
  41. Calculus Physics

    A particle is subject to a time-dependent force: F(t)=5t√. If the particle's mass is 7 kg, what will its velocity be at t=6.7 seconds, assuming its initial velocity at t=0 is equal to 0.

    asked by danny on February 19, 2015
  42. physics

    The ball is thrown with an initial speed of 3.7 m/s at an angle of 15.4° below the horizontal. It is released 0.83 m above the floor. What horizontal distance does the ball cover before bouncing?

    asked by !!!! on September 12, 2011
  43. physics

    two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?

    asked by James on September 29, 2012
  44. physics

    two stones with initial speeds of 13 m/s and are thrown at an angle 30 degrees, one below the horizontal and one above the horizontal. What is the distance between the points where the stones strike the ground?

    asked by James on September 29, 2012
  45. Physics

    A ball rolls off the edge of a table that is 1.03 m high, and it strikes the floor at a point 1.40 m from the base of the the table. What is the initial speed in m/s of the ball?

    asked by Asia on November 14, 2012
  46. physics

    The initial velocity of a 2.56 kg block sliding down a frictionless inclined plane is found to be 1.13 m/s. Then 1.08 s later, it has a velocity of 3.99 m/s.What is the angle of the plane with respect to the horizontal?

    asked by Rachel on January 29, 2012
  47. physics

    A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.1 s, how tall is the building?

    asked by sid on February 21, 2012
  48. physics

    A boy moves 400m towards north 300m towards west and again 400m towards south calculate displacement of the boy from initial position

    asked by rom on June 25, 2016
  49. PHYSICS

    An athlete on a trampoline leaps straight up into the air with an initial speed of 9.3 m/s. Find the following: (b) the speed of the athlete when she is halfway up to her maximum height

    asked by Petrik on October 27, 2010
  50. physics

    A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.4 s, how tall is the building?

    asked by kaf on January 30, 2012
  51. physics

    A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. At what height will the balloon strike the building?

    asked by James on October 14, 2014
  52. Physics

    A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 3.5 s, how tall is the building?

    asked by Court on September 11, 2011
  53. physics

    A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building?

    asked by lisa on February 5, 2016
  54. chem

    What is the final temperature (degrees celcius) of 1.36g of water with an initial temperature of 23.0degrees celcius after 6.420J of heat is added to it?

    asked by Chironjit on November 19, 2012
  55. physics help please

    A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)

    asked by lisa on February 4, 2016
  56. chem

    Sb2S3(s) + 3 Fe(s) 2 Sb(s) + 3 FeS(s) When 14.7 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction? %

    asked by Anonymous on February 10, 2012
  57. Chemistry- Stoichiometry

    "Why must a chemical reaction be balanced before it can be used in stoichiometry?" I mean, I get it, that the equation will be off if it doesn't start out balanced, but, why? How do I phrase that?

    asked by Shelby on September 28, 2007
  58. chem

    write a mechanism for the reaction of sodium chloroacetate with 4-chlorophenolate. - i know its a sn2 mechanism, but I don't know who to go about from here

    asked by jason on January 30, 2009
  59. chemistry

    If 6.30 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction?

    asked by Natalie on October 15, 2015
  60. Chemistry

    How many milliters of 0.500 M magnesium nitrate can be produced from the reaction of 35.5 grams of magnesium bromide.

    asked by Arlene on April 3, 2011
  61. chemistry

    in reaction S + O2 -> SO2, determine percent yield if 4 grams of S produced 64 gram of SO2

    asked by Fakhrywik on February 13, 2013
  62. Chemistry

    10% of a sample reacts in 25 s. If the reaction follows first order kinetics, how long would it take for half the sample to react?

    asked by mandy on May 4, 2010
  63. Chemistry

    A cell has a standard emf of +0.177 V at 298 K. What is the value of the equilibrium constant for the cell reaction a) if n=1? b) if n=2?

    asked by Summer on April 9, 2013
  64. Chemistry

    Hi, i would like to know how hydrogen can be manufactured from methane using a nickel catalyst. What must be added to methane in the reaction? +Ni CH4 + ??? -----> H2 + ???

    asked by Monica on September 23, 2009
  65. chemistry please help!!

    what is the net ionic equation for the reaction between a strong acid and a strong base? what does it mean by this question?/ (: thanks.

    asked by yvette on March 5, 2013
  66. CHEMISTRY

    AT A CERTAIN TEMPERATURE, THE REACTION CO(g) + 2H2(g) CH3OH (g) has Kc = 0.500 CO= 0.180 M H2= 0.220 M WHAT IS THE CONCENTRATION OF CH3OH?

    asked by HELP IM LOST on October 16, 2011
  67. Chemistry

    How has the equilibrium been modified in Haber Process? what is the heat value for the following exothermic reaction : Hb(aq) + O2(aq) = HbO2(aq) + (Heat ?)

    asked by krish on November 28, 2011
  68. chemistry

    Would the reaction of NaOH and HCl be arrhenius, bronsted-lowry, or lewis? What about NaOH and H2SO4?

    asked by Amy on June 9, 2010
  69. Physics

    A car is traveling at 24.4 m/s. If the driver has a reaction time of 1 second, what will be his stopping distance if his car slows down at 8 m/s2?

    asked by Joseph on September 20, 2013
  70. physical science

    In terms of energy, the general chemical equation AB+CD+energy = AD+CB represents a (an)_________ reaction.

    asked by Jason on January 30, 2013
  71. Chemistry

    Once it is balanced, in the following chemical reaction NaHCO3(s) Na2O(g) + CO2(g) + H2O(l), what is the coefficient for Na2O (s)? a. 1 b. 2 c. 3 d. 4

    asked by Pennelope on November 2, 2009
  72. psychology

    a defense mechanism is an unconscious reaction used to protect the mind? true or false ,true right

    asked by M on August 23, 2008
  73. chemistry

    How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)

    asked by richard w on February 27, 2013
  74. Chemistry

    What is the theoretical yield of ethyl chloride in the reaction of 19.2g g of ethylene with 48g g of hydrogen chloride?

    asked by Allison on November 3, 2013
  75. Chemistry

    3O2(g)---> 2O3(g) At a given instant, the reaction rate in terms of [O2] is 2.17x10^-5 mol/L*s. What is it in terms of O3?

    asked by Amy on April 4, 2010
  76. Chem

    3O2(g)---> 2O3(g) At a given instant, the reaction rate in terms of [O2] is 2.17x10^-5 mol/L*s. What is it in terms of O3?

    asked by Mike on April 6, 2010
  77. CHEM

    Consider the reaction, 3 NO2(g) + H2O(l) ® 2 HNO3(aq) + NO(g), where DH = – 137 kJ. How many kilojoules are released when 92.3 g of NO2 reacts?

    asked by jerry on March 22, 2012
  78. chemistry

    in reaction S + O2 -> SO2, determine percent yield if 4 grams of S produced 64 gram of SO2

    asked by Fakhry on February 13, 2013
  79. chemistry

    What type of chemical reaction is this equation? CuO (s) + [2H+ + SO4 2-](aq) [Cu2+ + SO4 2-] (aq) + H2O (l)

    asked by Anonymous on March 29, 2017
  80. A & M

    how many grams of CaO are required for complete reaction with the HCl in 275mL of a 0.523 M HCl?

    asked by Roxie on July 29, 2010
  81. Chemistry-Stoichiometry

    what is the limiting reactant if 0.10 moles Fe and 0.16 moles O2 react according to the reaction 4Fe +3O2 -> 2Fe2O3?

    asked by Barbara on October 19, 2013
  82. chemistry

    How many mL of 0.40M NaOH are need to neutralize 30.0 mL of 0.50 M H2SO4 according to the following reaction. 2NaOH(aq) + H2SO4 (aq)----Na2SO4 (aq) + 2H2O(l)

    asked by Sara on March 21, 2013
  83. Chemistry

    The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate ∆E° for the following reaction. H2O (l) → H2 (g) + 1/2 O2 (g)

    asked by Mahnoor on November 16, 2014
  84. Chemistry

    Consider the Unbalanced Reaction: Al2O3(s) + CO(g) → Al(s) + CO2(g) Estimate ∆G at 298 K if 7.1 moles of Al2O3(s) is reacted.

    asked by Zachary on July 5, 2017
  85. College Chemistry

    The value of ΔG°f at 25°C for gaseous mercury is 31.85 KJ/mol. What is the vapor pressure of mercury at 25°C? [Hint: calculate the Kp for the reaction Hg(l)=Hg(g)]

    asked by alice on December 6, 2010
  86. chemistry

    the value of ΔH° for the reaction of 2 C6H6 (l) + 15 O2 (g) = 12 CO2 + 6H20 is -6535 kJ. how many kJ of heat are released in the combustion of 16.0 g of C6H6 (l) ?

    asked by Agnes on March 6, 2012
  87. chemistry

    the value of ΔH° for the reaction of 2 C6H6 (l) + 15 O2 (g) = 12 CO2 + 6H20 is -6535 kJ. how many kJ of heat are released in the combustion of 16.0 g of C6H6 (l) ?

    asked by Agnes on March 6, 2012
  88. Chemistry

    In this reaction, 4.58 L of O2 were formed at 745mm Hg and 308 K. How many grams of Ag2O decomposed. 2 Ag2O----> 4 Ag + O2 Please help I'm very confused

    asked by Monique on October 17, 2011
  89. Biology

    In the following chemical reaction, what is carbon dioxide (CO2)? 12 H20 + 6 CO2 -> 1 glucose molecule + 6 O2

    asked by Michelle on March 2, 2009
  90. Chemistry

    Draw the product(s) of the following reaction CH3-CH2-C(triple bond)C-CH2 ---------> ? (Na/NH3)

    asked by anon on October 27, 2016
  91. Chem

    A lake may be polluted with Pb2+ ions. what precipitation reaction might you use to test for the presense of Pb2+?

    asked by Josh on October 9, 2011
  92. chemistry

    Calculate ΔG for this reaction under the following conditions (assume an uncertainty of ±1 in all quantities). Assume that ΔH° and ΔS° do not depend on temperature.

    asked by Sarah on May 1, 2012
  93. Physical science

    Consider the following reaction that occurs at STP:what mass of N2 gas is needed to react with 12g H2 gas?

    asked by Thandi faith mapili on September 2, 2015
  94. Chemistry

    how many grams of ethylene (C2H4) are required for the complete reaction of 31.7 grams of hydrogen gas?

    asked by Vilma on October 2, 2012
  95. chemistry

    how many moles of oxygen (molecule) are required for complete reaction with 2.1080 moles of iron?

    asked by Anonymous on September 26, 2010
  96. Chemistry 104 PLEASE HELP ME!!

    Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3

    asked by Sophie on May 4, 2013
  97. CHEM

    How many liters of O2 will react with 100 liters of H2 according to the gas phase reaction: O2 + 2H2 ------2H2O

    asked by MICHELLE on May 3, 2013
  98. Decomposition reaction

    List the number of reactants and the number of products in a decomposition reaction; 2H2O(I)=2H2(g)+O2(g)

    asked by Eric on February 27, 2014
  99. Chemistry 104

    Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3

    asked by Sophie on May 4, 2013
  100. chem

    If 507 g FeCl2 were used up in the reaction FeCl2 + 2NaOH Fe(OH)2(s) + 2NaCl, how many grams of NaCl would be made?

    asked by gabby on February 25, 2013