1. Chemistry help emergency? (theoretical mass/mol)

    I am supposed to calculate the theoretical mass and moles of Cu. However I am given the mass of 2 reactants in the balanced equation: 3CuCl2*2H2O + 2Al -> 3Cu + 2AlCl3 + 6H2O I am given the mass of CuCl2*2H2O to be 0.477g and the mass of Al is 0.267g. If I

    asked by ray on November 1, 2016
  2. Math

    Moore Supermarket began the year with 300 boxes of oat flake cereal with a unit cost of $1.89. During the year, the following additional purchases were made: May 1 200 boxes@$2.10/each June 1 400 boxes@$2.20/each August 1 250 boxes@$2.40/each At the end of

    asked by Cache on February 10, 2017
  3. Math

    Moore Supermarket began the year with 300 boxes of oat flake cereal with a unit cost of $1.89. During the year, the following additional purchases were made: May 1 200 boxes@$2.10/each June 1 400 boxes@$2.20/each August 1 250 boxes@$2.40/each At the end of

    asked by Maria Taylor on December 30, 2016
  4. chemistry

    Shown below is a schematic representation of the water-ethanol phase diagram. Making reference to the phase diagram, explain in a few sentences how one could enrich a solution of 15 percent ethanol - 85 percent water to a composition of 60 percent ethanol

    asked by C on December 21, 2012
  5. Damon or DrBob please help..chemistry/physics

    Question: 0.37 litre of an ideal monatomic gas (Cv,m = 3R/2) initially at 51 °C and 36 atm pressure undergo an expansion against a constant external pressure of 1.06 atm, and do 2.3 kJ of work. The final pressure of the gas is 1.06 atm. Calculate the

    asked by Ashley on January 22, 2016
  6. Statistics

    Seven thousand raffle tickets are to be sold at $10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value

    asked by Krista on February 11, 2012
  7. Science

    a donkey pulls a cart c,with a mass of 240kg attached to a log of wood w with a mass of 80kg on a horizontal toad.W is tied to the back of C by means of a inelastic ropf which is inclined at 30 degrees to the horizontal. the donkey applies a force of 170 N

    asked by Shevonne on February 4, 2019
  8. Math

    Seven thousand raffle tickets are to be sold at $10 each to benefit a local community group. The prizes, the number of each prize to be given away, and the dollar value of winnings for each prize are as follows: Prize Number to Be Given Away Dollar Value

    asked by Krista on February 11, 2012
  9. Physics

    The velocity of a vehicle is uniformly reduced from 72km/h to 24km/ over a distance of 250m down a decline of 1:25 the mass of the vehicle is 1.5Mg and its tractive resistance is 400N. The retardation is uniform. Calculate the total constant braking force

    asked by anon on June 3, 2013
  10. Physics

    A 6m long uniform ladder which has a mass of 25kg leans with its upper end against a smoorth vertical wall and its lower end on rough horizontal ground. The base of the ladder is 3m from the wall and a man of mass 70kg is two thirds of the way up the

    asked by Tyrone on October 8, 2014
  11. Science (8th grade)

    I am doing a lab and I really need help! I calculated that my snail traveled as his average speed of .136 cm/s, 1.36m/s, and 4896 m/hr. Does that sound right? Also I need help on another thing. My paper says Calculate how long it will take your snail to

    asked by Ji on February 9, 2013
  12. math

    Nathaniel want to buy a new bike. His payment options are: Option 1: Pay $2055.99 cash. He only has $400.00 saved up, so he can take out a loan for the rest from his bank at a rate of 7.25% per annum over 2 years. Option2: Take the store payment plan of 12

    asked by mario on May 13, 2014
  13. math

    Nathaniel want to buy a new bike. His payment options are: Option 1: Pay $2055.99 cash. He only has $400.00 saved up, so he can take out a loan for the rest from his bank at a rate of 7.25% per annum over 2 years. Option2: Take the store payment plan of 12

    asked by pewdiepie on May 14, 2014
  14. chemistry

    Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=654.9J/mol*K

    asked by Kelsey on March 14, 2012
  15. Physics0

    The currently accepted maximum depth limit for safe scuba diving while breathing air is 50 metres. What is the absolute partial pressure of oxygen at this depth? my solution was as the following, please correct me if I'm wrong: P=F/A Thus the pressure

    asked by Adam on August 14, 2017
  16. Physics

    The kiloton, which is used to measure the energy released in an atomic explosion, is equal to 4.2 ✕ 1012 J (approximately the energy released in the explosion of 1000 tons of TNT). Recalling that 1 kilocalorie of energy raises the temperature of 1 kg of

    asked by Bona on December 8, 2016
  17. Physics

    The typical resistance of the tungsten filament of a 60 watt incandescent light bulb when it is turned off is 24 ohms and its resistance when operating from a 120 volt power source is 240 ohms. Generally, an incandescent light bulb filament is most likely

    asked by Joseph on February 23, 2010
  18. Physics

    The kiloton, which is used to measure the energy released in an atomic explosion, is equal to 4.2 ✕ 1012 J (approximately the energy released in the explosion of 1000 tons of TNT). Recalling that 1 kilocalorie of energy raises the temperature of 1 kg of

    asked by Tionna on December 4, 2017
  19. Chemistry (Help)

    Calculate the DHrxn of C6H12O6 (s) + O2 (g) --> CO2 (g) + H2O (l) with DHf. C6H12O6(s) -1260.04 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: C6H12O6 (s) + 6O2 (g) --> 6CO2 (g) + 6H2O (l) and my work: DHrxn = [(6x -393.5)+(6x -285.840)] -

    asked by Anonymous on November 17, 2015
  20. Chemistry``

    A substance (CD) decomposes into C and D. CD(g)  C(g) + D(g) At the temperature of the experiment, 15.0 percent of CD is decomposed when equilibrium is established. a) If the initial concentration of CD is 0.200 mol/L, what are the equilibrium

    asked by Linda on May 8, 2007
  21. Physics

    1. A particle moving with simple harmonic motion has maximum displacement of 50 cm angular velocity of 1.02rad/s. Calculate the (a) the maximum velocity (b) maximum acceleration of the particle (c) the speed and acceleration of the particle when it is 30cm

    asked by Michael O. Davies on April 2, 2018
  22. math

    Maximum or minimum values of the function f(x) = (1 – x)^2 e^x is: i need solution (a) Minimum value at x = –1; maximum value x = 1 (b) Minimum value at x = 1; maximum value x = –2 (c) Minimum value at x = 1; maximum value x = –1 (d) None of these

    asked by asad on November 25, 2015
  23. Chemistry

    A solution with pH = 4 has 1. relatively high concentration of OH- 2. relatively low concentration of H3O+ 3. relatively high concentration of H3O+ 4. zero concentration of OH-

    asked by nan on October 22, 2011
  24. sjpuc

    A swimmer speed in the direction of flow of water is 60km/hr .against the direction of flow of water is 8km/hr calculate the swimmer speed in still water and velocity of flow of river

    asked by abhishek.h on September 3, 2015
  25. Maths

    An aeroplane flies from a town X on a bearing of N 45 degree E to another a town Y on a distance of 200km.it then changes course and flies to another town Z on a bearing of S 60 degree E.if Z is directly east of X.Calculate (a) the distance from X to Y (b)

    asked by Bright on August 24, 2015
  26. Chemistry College

    A 79.1 g mixture of the compounds calcium chloride and sodium sulfide is 80.9 % by mass sodium sulfide. The compound sodium sulfide is 58.9 % by mass sodium. Calculate the mass (g) of sulfur in the mixture. thanks.

    asked by Lance on May 3, 2012
  27. Math

    I have to come up with an equation that calculate if I blink my eyes 22 times per 10 seconds, how many times would I blink in 1,000,000 seconds? Need an equation to prove my answer of 2,200,000 times

    asked by Anonymous on January 22, 2013
  28. Dr vsec

    The density of water of ice is 0.917gm/cm-3 and the density of sea water is 1.03gm/cm-3.calculate the ratio volume of ice outside to the volume of ice which is inside the sea water

    asked by Anant shukla on November 23, 2015
  29. Chemistry

    Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED

    asked by tina on June 16, 2011
  30. chemistry

    A definite amount of NH4cl was boiled with 100ml of 0.8N naoh for complete reaction . After the reaction mixture containing excess of naoh was neutralized with 12.5ml of 0.75N NH2so4. Calculate the amount of NH4cl taken. I want you to explain about 100ml x

    asked by Fai on February 10, 2013
  31. chemistry

    A sample contains Hydrogen atom ,He+ ion, Li2+, & Be3+ ion. In H atom electron is present in 8th orbit, in He2+ e- is present in 6th orbit, Li2+ in 5th orbit& in Be3+ electron is present in 4th orbit. All the atoms are de-excited to the ground state.

    asked by Swapnil on June 4, 2014
  32. Chemistry

    An electrochemical cell is created using gold and magnesium half-cells. a. Determine which half-cell will undergo oxidation and which will undergo reduction, identify anode and cathode, and calculate the voltage for the cell. You do not need to diagram the

    asked by Jeffery on November 30, 2010
  33. Chemistry2

    An electrochemical cell is created using gold and magnesium half-cells. a. Determine which half-cell will undergo oxidation and which will undergo reduction, identify anode and cathode, and calculate the voltage for the cell. You do not need to diagram the

    asked by Adam on November 27, 2010
  34. Math

    A plane leaves an airport X, 20.6degrees east and 36.8 north degrees and flies due south along the same longitude for 8 hours at the rate of 1000km/h to another airport Y, 20.6degrees east and tita degree south. The plane then flies west to another airport

    asked by Anonymous on November 1, 2014
  35. Chemistry

    Part A Calculate the standard enthalpy change for the reaction 2A+B --->2C +2D Use the following data: Substance Delta H(kJ/mol) A -263 B -391 C +203 D -523 Express your answer in kilojoules. MY ANSWER FOR PART A: Delta H =277 kJ PART B----THIS ONE I NEED

    asked by tina on June 16, 2011
  36. Finance

    Consider the following information and calculate the required rate of return for the Winkler Investment Fund. The total investment fund is $2 million. Stock Investment Beta ----- ---------- ---- A $ 200,000 1.50 B 300,000 -0.50 C 500,000 1.25 D 1,000,000

    asked by ahmad on July 19, 2013
  37. Maths

    A truck is loaded with two different types of crates. When 20 of crate A and 25 of crate B are loaded, the truck’s 8 tonne capacity is reached. When 2 of crate A and 16 of crate B are loaded, the same capacity is reached. Calculate the mass of each

    asked by Jannie on November 13, 2010
  38. Physics

    A 6090kg space probe mobing nose-first toward Jupiter at 105m/s relative to the Sun, fires its rocket engine ejecting 80 kg of exhaust at a speed of 253 m/s relative to the space probe. What is the final velocity of the probe? I should have gotten 108m/s

    asked by Tammy on February 2, 2007
  39. Biomass increase !

    Can anyone help please, Can anyone help me to calculate the increase in biomass in each of the three groups, Field mice Ingested 107Kj m-2 y-1 and lost 105 kj m-2 y-1 in respiration & faeces Grasshoppers ingested 444 kj and lost 374.3 kj and small birds

    asked by Freddo on December 30, 2006
  40. Chem

    The best solar panels currently available are about 13% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity a day. Assuming 8 hours of useful sunlight per day, calculate the minimum solar panel surface area

    asked by Joe on October 20, 2006
  41. math

    I am a little confused on the first question of this problem could someone please check my answers and please explain why and what I need to do to get correct answer thank you Calculate the mean, and write this as a mixed fraction.

    asked by My worst subject is math on September 4, 2009
  42. physics

    How can I find kinetic friction (Fk) without mu? I know the normal force which is 201N. The mass of the object is 30kg. This is the full questions of it helps. I just don't understand how to find kinetic friction 1. If a 30kg object experiences a normal

    asked by Tina on June 22, 2011
  43. physics As

    The current carriers in a piece of semiconducting material have a charge of 1.6 x 10^-19C. Calculate the number of charge carriers entering the material per second when the current is 3 microamps so 3 x 10^-6 amps. ? Please help and do it step by step all

    asked by cylinder on December 14, 2017
  44. Physics (College)

    A student rides her bicycle home from physics class to get her physics book and then heads back to class. It takes her 21.0 min to make the 12.8 km trip home and 13.0 min to get back to class. Calculate her average speed for the round-trip. Answer must be

    asked by Maya on September 7, 2016
  45. acounting

    A company earned earned $39,000 in revenues and received $33,000 cash from these customers. The company incurred expenses of $22,500 but had not paid $2,250 of them at years end. Harden also prepaid $3750 cash for expenses that would be incurred the next

    asked by shelly on October 11, 2007
  46. physics

    The kiloton, which is used to measure the energy released in an atomic explosion, is equal to 4.2 multiplied by 1012 J (approximately the energy released in the explosion of 1000 tons of TNT). Recalling that 1 kilocalorie of energy raises the temperature

    asked by Kim on April 10, 2013
  47. chemistry thermodynamics

    calculate the w, q, delta H, and delta U for the process in which 1 mol of liquid water at 373 K undergoes the transition to gas phase water at 406 L. the volume of liquid water at 373K is .98 x 10^-5 m^3/mol and the volume of steam at 373 and 460 K is

    asked by romell on February 28, 2011
  48. Maths

    1. Sketch the curves y=e^x and y=e^-2x, using the same axes. The line y=4 intersects the first curve at A and the second curve at B. Calculate the length AB to two decimal places. 2. Find the coordinates of the turning point on the curve y=2e^3x+8e^-3x and

    asked by Anonymous on February 18, 2009
  49. accounting

    A company earned earned $39,000 in revenues and received $33,000 cash from these customers. The company incurred expenses of $22,500 but had not paid $2,250 of them at years end. Harden also prepaid $3750 cash for expenses that would be incurred the next

    asked by shelly on October 12, 2007
  50. As physics

    The current carriers in a piece of semiconducting material have a charge of 1.6 x 10^-19C. Calculate the number of charge carriers entering the material per second when the current is 3 microamps so 3 x 10^-6 amps. ? Please help and do it step by step all

    asked by cylinder on December 12, 2017
  51. a. chem

    A 50.0 mL sample containing Cd2 and Mn2 was treated with 58.7 mL of 0.0500 M EDTA. Titration of the excess unreacted EDTA required 17.7 mL of 0.0300 M Ca2 . The Cd2 was displaced from EDTA by the addition of an excess of CN–. Titration of the newly freed

    asked by Lana on April 4, 2013
  52. PHYSICS VECTORS

    1. The problem statement, all variables and given/known data Find the vector product of Vector A cross Vector B(expressed in unit vectors) of the two vectors. What is the magnitude of the vector product? 2. Relevant equations Vector A= 5.00i + 2.00j Vector

    asked by RAYMOND on September 17, 2009
  53. Calculus

    Obtain the MacLaurin series for 1/(2-x) by making an appropriate substitution into the MacLaurin series for 1/(1-x). ------------ The MacLaurin series for 1/(1-x) = Σ x^k I substitue (x-1) in for x, because 1/(2-x) = 1/(1-(x-1)) Making the same

    asked by Sean on June 25, 2009
  54. Math

    I can't calculate 1 as the answer given to the following problem. I keep getting 2. Can you show me where am I going wrong? The spread of rumor among 100 people can be approximated by the equation log10(x) – log10(100-x) = (0.1)t – log10(90), where x

    asked by Chris on July 3, 2008
  55. physics

    An isolated capacitor of unknown capacitance has been charged to a potential difference of 100 V. When the charged capacitor is then connected in parallel to an un- charged 10.0 μF capacitor, the potential difference across the combination is 30.0 V.

    asked by dani on May 24, 2016
  56. physics

    Concrete is pumped from a cement mixer to the place it is being laid, instead of being carried in wheelbarrows. The flow rate is 250 L/min through a 50.0 m long, 8.00 cm diameter hose, and the pressure at the pump is 8.50 ✕ 106 N/m2 (about 1200 psi). (a)

    asked by Uri on July 3, 2015
  57. science

    During a competition, a 60kg cyclist rides along a horizontal road on a bike with a mass of 5kg. During her ride, she changes gears and uses the chain wheel with a radius of 7.5cm and 36 teeth, and the rear sprocket with 18 teeth. The pedal handle is 20 cm

    asked by samantha on September 2, 2010
  58. chemistry

    a 5.00g sample of Al pellets (specific heat=0.89J/oC*g) and a 10.00g sample of Fe pellets (specific heat=0.45J/oC*g) are heated to 100.0oC. The mixture of hot iron Al is then dropped into 92.1g of water at 21.8oC. Calculate final temp of metal and water

    asked by Rebekah on November 6, 2007
  59. Physics

    During a neighborhood baseball game in a vacant lot, a particularly wild hit sends a 148-g baseball crashing through the pane of a second-floor window in a nearby building. The ball strikes the glass at 10.1 m/s, shatters the glass as it passes through,

    asked by Kyle on November 19, 2012
  60. Physics

    1)A car of mass 1330 kg is traveling at 28.0 m/s. The driver applies the brakes to bring the car to rest over a distance of 79.0 m. Calculate the retarding force acting on the car. I don't get it. What is retarding force? gravity has to factor in somewhere

    asked by Jon on April 15, 2008
  61. probablity

    We are given a biased coin , where the probability of heads is q. he bias q is itself the realization of a random variable Q which is uniformly distributed on the interval [0,1]. We want to estimate the bias of the coin. We flip it 5 times, and define

    asked by Anonymous on December 23, 2018
  62. Chemistry

    Calculate the average C—C bond strength in cyclopropane (in kJ/mol). Its combustion and the experimental enthalpy of reaction are: C3H6(g) + 4.5O2(g) → 3CO2(g) + 3H2O(g) ΔHºrxn = -1,957.7 kJ/mol Since all reactants and products are in the gaseous

    asked by JUNDY on April 7, 2015
  63. Chemistry

    1. Write the balanced equation. Use ONLY this equation to reference how the reactions below will shift. Consider whether there is an addition, a removal, or no effect to the reaction. Co(H2O)6^2+ + 4Cl^- CoCl4^2- + 6H2O 2. Write the equilibrium expression

    asked by Kate on January 28, 2015
  64. chem!

    Calculate the heat of reaction for the incomplete combustion of 67.0g propane producing carbon monoxide gas and water vapour. how would I go about and do this question? What are you studying? Do you know how to use the thermodynamic tables (delta Ho, etc).

    asked by Chem on May 14, 2007
  65. physics

    A uniform rod of mass M = 0.245kg and length L = 0.49m stands vertically on a horizontal table. It is released from rest to fall. (a) Calculate the angular speed of the rod, the vertical acceleration of the moving end of the rod, and the normal force

    asked by jay on October 30, 2012
  66. Physics - Kinematics

    Need some help with my homework! Question 7 a) Acceleration is the rate of change of velocity Use your definition in (a) to show that v = u + at, where v is the final velocity, u is the initial velocity and a and t are the acceleration and the time

    asked by Iman on April 17, 2012
  67. computer science

    in visual logic You will need to design an application that it will prompt a user for their hourly pay rate, their hours worked, and whether they are single, married, divorced, or widowed. It will then calculate their gross and net pay. If they work more

    asked by carol on May 22, 2011
  68. chemistry. please help drbob222

    One of the reactions involved in the smelting of copper sulfide ores involves copper (I) oxide and copper (I) sulfide: 2Cu2O2 + Cu2S ---> 6Cu + SO2 Assuming that 35.00 g of copper (I) oxide is heated with 25.00 g of copper (I) sulfide A) determine which

    asked by Rose on December 7, 2014
  69. Physics

    Use the definition of scalar product( vector A* vector B = abcos theda and the fact that vector A * vector B = axbx+ ayby+azbz to calculate the angle between the two vectorgiven by vector A= 3i + 3j + 3k and vector B= 2i + 1j + 3k. The book said the answer

    asked by Jamie on October 6, 2006
  70. com 200

    Kyle has struggled to feel comfortable in science classes with labs since his junior year of high school, when a solution he was working with ignited. He was always cautious with chemicals but his lab partner that year enjoyed seeing what would happen when

    asked by elizabeth on June 15, 2014
  71. physics

    Part B Piles of snow on slippery roofs can become dangerous projectiles as they melt. Consider a chunk of snow at the ridge of a roof with a pitch of 21. As the snow begins to melt, the coefficient of static friction decreases and the snow eventually

    asked by Anne on October 15, 2010
  72. Chemistry (Check)

    Calculate the DHrxn of C6H12O6 (s) + O2 (g) --> CO2 (g) + H2O (l) with DHf. C6H12O6(s) -1260.04 O2(g) 0 CO2(g) -393.5 H2O(l) -285.840 I balanced the equation: C6H12O6 (s) + 6O2 (g) --> 6CO2 (g) + 6H2O (l) and my work: DHrxn = [12mol(-393.5+(-285.840))] -

    asked by Anonymous on November 17, 2015
  73. math

    how do i solve this: a Train leaves Poughkeepsie to grand central station in NYC at an average speed of 40 mph. a half hour later an express train leaves poughkeepsie station to NYC at a speed of 50 mph. both trains arrive at NYC the same time. based on

    asked by israel on November 12, 2011
  74. Physics

    A closed inexpansible vessel contains air saturated with water vapour at 77 degree Celcius. The total pressure of the vessel is 1007mmHg. Calculate the new pressure if the temperature is reduced to 27 degree celcius. (svp water at 77 degree celcius and 27

    asked by Shredder on February 27, 2016
  75. physics

    (a) Calculate the mass flow rate (in grams per second) of blood (ρ = 1.0 g/cm3) in an aorta with a cross-sectional area of 2.0 cm2 if the flow speed is 35 cm/s. g/s (b) Assume that the aorta branches to form a large number of capillaries with a combined

    asked by monic on January 26, 2013
  76. Fat gram calculator

    Design a program that asks the user for the number of fat grams and calories in a food item. Validate the input as follows. Make sure the number of fat grams and calories are not less than 0. According to nutritional formulas, the number of calories cannot

    asked by John on October 13, 2013
  77. math

    can please someone check my answer Q.) 30% of the adult population was offline in terms of being able or willing to access the internet. New data relating to the year 2010 (sourced from The Office for National Statistics) indicated that this group numbered

    asked by Mctagger on June 23, 2011
  78. bobpursley

    I don't really understand what you mean by "factors"... factors of 2 and factors of 3? If you have a 1.2M concentration, and you want to dilute it to .45M concentration, you are diluting it by a factor of 1.2/.45 or 2.666666. To do that, add 1.66666 parts

    asked by Rienna on January 29, 2007
  79. accounting

    How do i calculate this problem. An asset was purchased for $150,000. It had an estimated salvage value of $30,000 and an estimated useful life of 10 years. After 5 years of use, the estimated salvage value is revised to $24,000 but the estimated useful

    asked by Peaches on December 3, 2009
  80. Chemistry

    What is the net chemical equation of: Reaction 1: 3.3 kcal/mol+glucose+Pi --> glucose-6-phosphate+H2O Reaction 2: ATP+H2O --> ADP+Pi+7.3 kcal/mol AND Calculate the amount of energy released in the coupled reaction. energy released: ____kcal/mol

    asked by HELP! on December 2, 2012
  81. Maths / physics

    Calculate the rest mass (In grams) of an object whose rest energy is equal to the energy released by a tonne of tnt the energy liberated by 1 g of tnt = 4kJ Rest energy = moc 2 1 tonne of tnt equals 10^6 x 4kJ = 4 x 10^6 kJ x (3.0^8)sqrd = 3.6 x 10^23kJ is

    asked by Wayne on August 27, 2013
  82. Straight-line Depreciation

    Please how do i calculate this problem. An asset was purchased for $150,000. It had an estimated salvage value of $30,000 and an estimated useful life of 10 years. After 5 years of use, the estimated salvage value is revised to $24,000 but the estimated

    asked by Peaches on December 3, 2009
  83. Physics

    Two pucks collide on an air hockey table. Puck A has a mass of 16 g and is initially traveling in the +x direction at 6.2 m/s. Puck B has a mass of 64 g and is initially at rest. After the pucks collide, puck A moves away at an angle of 58 above the +x

    asked by Mehreen on February 25, 2011
  84. Algebra

    Jess uses her scanner to scan pages at the rate of $.09 per page. She decides to rent a scanner for $70 a year. The cost of scanning using the rented scanner is $.02 per page. Please help me write an inequality that can be used to calculate the number of

    asked by Anonymous on November 2, 2014
  85. physics

    I posted this before and didn't get an answer but I'm still stuck... A 3m long, 290N uniform rod is held in a horizontal position by two ropes at its ends. The left rope makes an angle of 150 degrees with the rod, and the right rope makes an angle theta

    asked by tyger2020 on November 15, 2018
  86. chemistry

    How do you solve this problem? In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a shpere) is 10.0cm^3. Calculate the surface area of the catalyst. IF the sphere is broken down into eight

    asked by Jin on July 15, 2010
  87. Engineering Science N4

    The diameter of the ram cylinder of a hydraulic press is 200mm. The stroke length of the plunger is 50mm. the effort on the plunger is 5% of the load. Calculate, i) the volume of the liquid needed per stroke if the load has to be lifted 60mm in 30 strokes,

    asked by Paul - Anonymous on March 31, 2017
  88. Algebra

    A school planned to buy x calculators for a total cost of Ksh 16200. The supplier agreed to offer a discount of Ksh 60 per calculator. The school was the able to get three extra calculators for the same amount of money. (a) Write an expression in terms of

    asked by Anonymous on October 15, 2012
  89. Economics

    Suppose that the Government runs a pension fund to which all workers must contribute. The employee contribution rate is 6.2 percent on the first $84,900 of income. All income in excess of $84,900 is not taxed for pension purposes. What was the effective

    asked by Tisha on March 8, 2007
  90. Math

    A school planned to buy x calculators for a total cost of Ksh 16200. The supplier agreed to offer a discount of Ksh 60 per calculator. The school was the able to get three extra calculators for the same amount of money. (a) Write an expression in terms of

    asked by Anonymous on October 15, 2012
  91. Math College 115

    You spend $1000 on a computer and for tax purposes chose to depreciate it (or assume it decreases in value) to $0 at a constant rate over a 4-year period. a) calculate the rate of chage of the assumed value of the equipment over 4 years. The rate of change

    asked by Hazle on September 4, 2016
  92. Math

    A Kenyan bank buys and sells foreign currencies Buying (Ksh) Selling(Ksh) 1 Sterling pound 130.10 130.54 1 South African Rand 9.52 9.8 A businessman on a trip to Kenya had pound 50,000 which he coneveted to Kenya shillings. While in Kenya, he spent 80% of

    asked by Kd on October 3, 2018
  93. Business Maths

    Please how do i calculate this problem: The Raymore Company issued 10-year bonds on January 1, 2007. The 15% bonds have a face value of $100,000 and pay interest every January 1 and July 1. The bonds were sold for $117,205 based on the market interest rate

    asked by Peaches on December 10, 2009
  94. Physics

    An empty relative density bottle has a mass of 30g. When filled with paraffin,its mass is 70g. Calculate the mass of the bottle when it is filled with water. (relative density of paraffin=0.8)

    asked by Zaynab on April 28, 2017
  95. Math

    A small factory employs 7 experienced and 5 inexperienced workers. The mean monthly wage of these 12 workers is $700. Given that the mean monthly wage of 5 inexperienced workers is $602, calculate the mean wage of the 7 experienced workers.

    asked by MJ on March 8, 2010
  96. physics

    The escape velocity of a bullet from the surface of planet Y is 1695 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.37 times that of Y, and its radius is 0.887 times the radius of Y (in m/s).

    asked by Marie on March 11, 2014
  97. chem

    Calculate ΔG° (in kJ/mol) for the following reaction at 1 atm and 25 °C: C2H6 (g) + O2 (g) → CO2 (g) + H2O (l) (unbalanced) ΔGf° C2H6 (g) = –32.89 kJ/mol; ΔGf° CO2 (g) = –394.4 kJ/mol; ΔGf° H2O (l) = –237.13 kJ/mol

    asked by holly on April 10, 2016
  98. URGENT physics

    The escape velocity of a bullet from the surface of planet Y is 1695 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.37 times that of Y, and its radius is 0.887 times the radius of Y (in m/s).

    asked by Marie on March 11, 2014
  99. Science

    Consider the following reaction: CaCO3 - CaO + CO2 Calcium carbonate (CaCO3) was heated to yield CaO and CO2. If 60.0g of CaCo3 was heated and the yield for CaO was 44.6%, calculate the mass of CaO created.

    asked by Nasa on November 12, 2015
  100. science

    You are given three displacement vectors: with magnitude 5.0 m in the direction of 60o below the negative x-axis, vector, has an x-component of +2.5 m and a y-component of +6.0 m and vector has magnitude of 2.5 m in the negative y-axis. Find the vector so

    asked by miezi on July 22, 2013

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