With metric everything seems easier.\nDistance:\n1km=1000m vs 1mile=5280ft\nWeight:\n1kg=100g vs 1lb=16oz\nTime:\n1hr=60mins\nWhy not 1unit(close to an hour) = 100 units(close to minutes)?
218287
because it relies to the events which can't be measured metrically anyway. Weeks follow the approximate lunar circle, there's 365 days in a year etc.\n\nalso, imagine we would divide a day into 100 hours. 1 hour would last only 14 minutes, which would be way too few and confusing. \nIf we divided a day into 10 hours, an hour would last 2 hours and 64 minutes. this would probably be too long, and we wouldn't have enough hours to properly determine a time of day...\n\nAn hour was determined as 1/4 of the time when the shadow of a pole travels a 60 degree angle or something... i THINK. I might be wrong on this, high school phisics is a LONG time ago. \nAnyway, it was old Sumerians or Babilonians who determined it like that and ever since it wasn't changed. We're too used to these units now, we can't just change them without causing a massive MESS :D
354157
The safest way to do any unit conversion is to just multiply your initial value by 1 unil the units are what you want. I know this sounds strange. I will explain by doing a more complex conversion.  This technique works for all conversions.\n\nI don't know the direct conversion from miles to km or from cm/sec to mph, but I do know this:\n\n1 inch = 2.54 cm\n100 cm = 1 m\n1000 m = 1 km\n12 inch = 1 foot\n5280 foot = 1 mile\n60 sec = 1 minute\n60 minute = 1 hour\n\nI can take any of the above equations and make the number one by dividing one side by the other ( 1 = (2.54 cm)/(1 inch)).\n\nI will convert 1 mile to km by taking 1 mile and multiplying it by 1 until all the units but km cancel:\n\n1 mile = 1 mile x (5280 ft/1 mile) x (12 inch/1 foot) x (2.54 cm/1 inch) x (1 m/100 cm) x (1 km/1000 m) = 1.609344 km\n\nGo through the above carefully to make sure its clear. Once you get comfortable with the concept of mulitplying by 1 and cancelling out the units properly, you can do any unit conversion.\n\nTake 30 cm/sec to mi/hr:\n\n(30 cm/sec) * (1 in/2.54 cm) * (1 foot/ 12 inch) * (60 sec/min) = 59.055 ft/min\n\nTake it from there.
119905
the way i do conversions is this. you know that 1kg = 1000g right? and 10mm = 1cm. so that means 1kg/1000g = 1 = 10mm/1cm. so you multiply the equation by 1 repeatedly until you get the units you want. \n\n3.435kg/mm^3 * 1000g/1kg * 10mm/1cm * 10mm/1cm * 10mm/1cm\n\nyou have to make sure the units you dont need all cancel out. in this case, the kg gets taken out and the mm should get taken out too. i dont know if u get this but ya. \nso the answer is 3435000g/cm^3\nlet me know if u needm roe help or whatever. laterz
491580
There are several wrong answers in the preceding.\nThese are correct:\n\n(lbf) = (lbm) * (acceleration in g)\n(lbf) = (slugs) * (acceleration in ft/sec^2)\n\n1 g = 32.174 ft/sec^2\ncorrespondingly\n1 slug = 32.174 lbm\n\nIf you know acceleration in in/sec^2, the corresponding unit mass would be 12 slugs or 386.09 lbm. This unit does not have a popular name that I am aware of.\n\n1 lbm = .45359 kg\nAll conversions are approximate
428707
Distance = Speed * Time.\nWe don't know the "distance" variable for either. We need to find the "time" at which the "distance" will be the same. Let distance = d\n\nWe want to find Thomas's time, so let Thomas's time = t.\nAlexis left 3 hours earlier, so her time is t + 3.\n\nThomas speed is 30, Alexis is 20. So lets fill this in.\nThomas:\nD = 30t\nAlexis:\nD = 20(t+3)\n\nThe distance will be the same, so the D in both equations is the same variable. A basic principle is that if a = b and b = c, then a = c.  Therefore, we can combine the equations for the two people as follows:\n30t = 20(t+3)\n30t = 20t + 60\n10t = 60\nt = 6 hrs\n\n\nThe same applies to the second.\nTimothy:\nD = 58t\nSavanah:\nD = 47(t+2)\n\n58t = 47(t+2)\n58t = 47t + 94\n11t = 94\nt = 8 6/11 OR 8.5454545454545\nt = 8 hours, 32 minutes, 43 seconds\n\n\n\nThe last one is slightly different.\nJet 1 Distance = 331t\nJet 2 Distance = 333t\nThe two distances aren't equal this time, but the two distances added up will equal 1,705, SO:\n331t + 333t = 1705\n664t = 1705\nt = 1705/664 = 2 377/664 = 2.56777108\nt = 2 hrs, 34 minutes, 4 seconds
117196
Remember that you have to do the conversion from cm to km (1m/100cm)*(1km/1000m) and from year to hours (365days/1year)*(1day/24hrs).  Kilometers should end up on top of the fraction and hours on the bottom.
349544
Say that a boy runs 1000 km in 5 minutes.  A unit rate must have the second quantity at 1 unit, so divide both by 5 to get 200 km per min.\n\nThe height decreases so it shows a negative rate of change, perhaps -2 mm  per minute
338948
D(istance) =  S(peed)   x   T(ime)\nor   D / T   =  S\n12 minutes =  .20 hr  \n11km /  .20h  =    55 km/h
606167
Foot-pound and pound-foot mean the same thing but I think it comes from usually we write torque as distance time force, so we put "foot" first (instead of force times distance, which is the same but anyway...).  \n\nHowever, the newton-meter (N-m) is preferred in metric, as a few pointed out.  A N-m is also exactly equal to one Joule (J), the metric unit for energy.  \n\nNow a ft-lb could be converted to a N-m ( I have no idea the conversion factor off the top of my head) in which case a ft-lb is equal to a certain amount of Joules, or energy.  \n\nIt seems odd that torque and energy have the same energy-based unit, but they do subtly refer to different things.  Another mechanics formula relate energy as force integrated over a distance.  If the force is constant, then the energy is force time distance = Joules.  Torque is force applied at a distance from a point of rotation, and therefore also coincidentally gives N-m or J as a unit, but is developed in a different way!
465081
just use the formula avg.speed=distance/time\nfor km/hr change time to 2.25 hr\nand for m/sec change distance to 500000m and time to 135*60sec\ndo these ques yourself. in exams you won't have yahoo answers\n:)
377081
What blaa blaaa!!!!\n\n1 cc = 0.001 L\n1 cc = 0.001 kg\nSo, 1 g  =  1 cc\n\n1 dm = 0.1 m\n1 dm = 100 mm\n1 dmc = 1,000,000 mm
56309
10 millimeters = 1 centimeter\n\n1 pound = .453592 kilogram
215311
All you need to know to convert N*m to lb*ft is to know that they are both units of torque. Sure, you could say they are both units of length multiplied by force, but that's besides the point. To do a conversion you will need to convert between units, that's just a fact of the matter. Why convert more units then necessary? If you know they are both units of torque, you are already done. Look up the conversion factor and there you go.\n\n1 N*m = 0.737561 lb*ft
673361
1kiometer=1000meter=10,000cm=100,000mm\n1 meter=100cm=1000mm\n1cm=10mm\n1 mile=1.6 kilometers\n12 lines  = 1 inch \n12 inches  = 1 foot \n3 feet  = 1 yard \n1760 yards  = 1 mile \n36 inches  = 1 yard \n440 yards  = quarter mile \n880 yards  = half mile \n4 inches  = 1 hand \n22 yards  = 1 chain \n5.5 yards  = 1 rod, pole or perch \n4 poles  = 1 chain \n40 poles  = 1 furlong \nLength\n \nMetric System\n \n1 millimeter = 1/1,000 meter \n1 centimeter = 1/100 meter \n1 decimeter = 1/10 meter \n1 meter (basic unit of length) \n1 dekameter = 10 meters \n1 kilometer = 1,000 meters \nAmerican and British Units\n \n1 inch = 1/36 yard = 1/12 foot \n1 foot = 1/3 yard \n1 yard (basic unit of length) \n1 rod = 5 1/2 yards \n1 furlong = 220 yards = 40 rods \n1 mile = 1,760 yards = 5,280 feet \n1 fathom = 6 feet \n1 nautical mile = 6,076.1 feet \nConversion Factors\n \n1 centimeter = 0.39 inch \n1 inch = 2.54 centimeters \n1 meter = 39.37 inches \n1 foot = 0.305 meter \n1 meter = 3.28 feet \n1 yard = 0.914 meter \n1 meter = 1.094 yards \n1 kilometer = 0.62 mile \n1 mile = 1.609 kilometers \nArea\n \nMetric System\n \n1 square centimeter = 1/10,000 square meter \n1 square decimeter = 1/100 square meter \n1 square meter (basic unit of area) \n1 are = 100 square meters \n1 hectare = 10,000 square meters = 100 ares \n1 square kilometer = 1,000,000 square meters \nAmerican and British Units\n \n1 square inch = 1/1,296 square yard = 1/144 square foot \n1 square foot = 1/9 square yard \n1 square yard (basic unit of area) \n1 square rod = 30 1/4 square yards \n1 acre = 4,840 square yards = 160 square rods \n1 square mile = 3,097,600 square yards = 640 acres \nConversion Factors\n \n1 square centimeter = 0.155 square inch \n1 square inch = 6.45 square centimeters \n1 acre = 0.405 hectare \n1 hectare = 2.47 acres \n1 square kilometer = 0.386 square mile \n1 square mile = 2.59 square kilometers \nVolume and Capacity (Liquid and Dry)\n \nMetric System\n \n1 cubic centimeter = 1/1,000,000 cubic meter \n1 cubic decimeter = 1/1,000 cubic meter \n1 cubic meter = 1 stere (basic unit of volume) \n1 milliliter = 1/1,000 liter = 1 cubic centimeter \n1 centiliter = 1/100 liter \n1 deciliter = 1/10 liter \n1 liter = 1 cubic decimeter (basic unit of capacity) \n1 dekaliter = 10 liters \n1 hectoliter = 100 liters = 1/10 cubic meter \nAmerican and British Units\n \n1 cubic inch = 1/46,656 cubic yard = 1/1,728 cubic foot \n1 cubic foot = 1/27 cubic yard \n1 cubic yard (basic unit of volume) \n1 U.S. fluid ounce = 1/128 U.S. gallon = 1/16 U.S. pint \n1 British imperial fluid ounce = 1/160 imperial gallon = 1/20 imperial pint \n1 pint = 1/8 gallon = 1/2 quart \n1 quart = 1/4 gallon \n1 U.S. gallon (basic unit of liquid capacity in the United States) = 231 cubic inches \n1 imperial gallon (basic unit of liquid capacity in some Commonwealth nations) = 277.4 cubic inches \n1 dry pint = 1/64 bushel = 1/2 dry quart \n1 dry quart = 1/32 bushel = 1/8 peck \n1 peck = 1/4 bushel \n1 U.S. bushel (basic unit of dry capacity in the United States) = 2,150.4 cubic inches \n1 imperial bushel (basic unit of dry capacity in some Commonwealth nations) = 2,219.4 cubic inches \nConversion Factors\n \n1 cubic centimeter = 0.06 cubic inch \n1 cubic inch = 16.4 cubic centimeters \n1 cubic yard = 0.765 cubic meter \n1 cubic meter = 1.3 cubic yards \n1 milliliter = 0.034 fluid ounce \n1 fluid ounce = 29.6 milliliters \n1 U.S. quart = 0.946 liter \n1 liter = 1.06 U.S. quarts \n1 U.S. gallon = 3.8 liters \n1 imperial gallon = 1.2 U.S. gallons = 4.5 liters \n1 liter = 0.9 dry quart \n1 dry quart = 1.1 liters \n1 dekaliter = 0.28 U.S. bushel \n1 U.S. bushel = 0.97 imperial bushel = 3.5 dekaliters \nWeight (Mass)\n \nMetric System\n \n1 milligram = 1/1,000,000 kilogram = 1/1,000 gram \n1 centigram = 1/100,000 kilogram = 1/100 gram \n1 decigram = 1/10,000 kilogram = 1/10 gram \n1 gram = 1/1,000 kilogram \n1 dekagram = 1/100 kilogram = 10 grams \n1 hectogram = 1/10 kilogram = 100 grams \n1 kilogram (
379990
speed = distance / time\n---rearange this----\n\nyou get ----->  time = distance / speed\n\ntime = (1.8 * 800) / 180\n\ntime = 1440 / 180\n\ntime = 8 hours\n\na looonnnng time for a bunch of fat men in a bus
368219
I'm going to use minutes instead of hours.\nWe know that on the first trip, D = 120S (D=distance, S=Speed of first trip).\nWe know that one the second trip, D = 90(S+6).\n\nTherefore 120S = 90S + 540, or 30S = 540, and S = 18kph.\nTherefore the distance is 36 kilometers.\nChecking, 24(1.5) for the second trip also = 36.
491706
Your answer is off, but how to fix it depends on what units of measure you want the result to be.\n\nSo, I assume that the elevations are in feet.  The difference and conversion look OK.  \n\nBut then, you divide 4432m by 160km.  The result should be 27.7 m/km.  \n\nIt looks like you tried to convert the one of the measurements so that the units were the same (i.e., 4.432km/160km or 4432m/160,000m ).  That would be OK, and would give you the result of 0.0277, but the units would be m/m or km/km.