Easily convert kilometers per square second to meters per square second, convert km/s2 to m/s2 . Two conversion factors are needed—one to convert hours to seconds, and another to convert kilometers to meters. (3) Check the significant figures. which are obviously not the desired units of km/h. There are several ways to convert the average speed into meters per second. To convert km/hr into m/sec, multiply the number by 5 and then divide it by 18. The answer does seem reasonable. To check your answer, consider the following: (1) Be sure that you have properly cancelled the units in the unit conversion. You can view more details on each measurement unit: km/h or m/s The SI derived unit for speed is the meter/second. Two conversion factors are needed—one to convert hours to seconds, and another to convert kilometers to meters. Let’s consider a simple example of how to convert units. ›› Quick conversion chart of km/h to m/s. The answer is 3.6. Samuel J. Ling (Truman State University), Jeff Sanny (Loyola Marymount University), and Bill Moebs with many contributing authors. Organizing and providing relevant educational content, resources and information for students. since “kilo-” means 103 and 1 = −2 + 3. We need to convert grams to kilograms and cubic centimeters to cubic meters. … Unit conversions may not seem very interesting, but not doing them can be costly. The correct conversion factors are those that cancel the unwanted units and leave the desired units in their place. (50 beats per second corresponds to 20 milliseconds per beat.). Think about how the unit is defined and state its relationship to SI units. The answer 30.0 km/hr does indeed have three significant figures, so this is appropriate. 1 km = 1000 m; 1 hr = 3600 sec. The density of iron is 7.86 g/cm3 under standard conditions. Conversion Definitions One cubic centimeter is equal to one milliliter. That conversion factor is \(60\;\mathrm{min/hr}.\) Thus, \(\mathrm{average \; speed} = 0.500\;\cfrac{\mathrm{km}}{\mathrm{min}} × \cfrac{60\;\mathrm{min}}{1 \mathrm{h}}\)\( = 30.0\;\cfrac{\mathrm{km}}{\mathrm{h}}.\). Average speed and other motion concepts are covered in later chapters.) 1 km/h is equal to 0.27777777777778 meter/second. Given that 1 lb (pound) is 4.45 N, were the numbers being output by SM_FORCES too big or too small? (Note: Average speed is distance traveled divided by time of travel.). This error caused the probe to follow a very different trajectory from what NASA thought it was following, which most likely caused the probe either to burn up in the Martian atmosphere or to shoot out into space. We assume you are converting between kilometre/hour and metre/second. In this case, we know that there are 1000 m in 1 km. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. If the unit conversion factor was written upside down, the units do not cancel correctly in the equation. So to convert from km/h to m/s, divide by #3.6# Note that dividing by #3.6# is the same as dividing by #4# then adding #11.bar(1)# %. Check that the units of the final answer are the desired units. Unless specified, this website is not in any way affiliated with any of the institutions featured. The correct conversion factors are those that cancel the unwanted units and leave the desired units in their place. The average distance between the Earth and the Sun is 1.496 × 10. 1 km/h to m/s = 0.27778 m/s. Remember, it’s always important to check the answer. You can even do km/hr/minute or something weird like that. For example, if you are reading a European cookbook, some quantities may be expressed in units of liters and you need to convert them to cups. How long did this trip take? We also want to convert minutes to seconds, so we use the conversion of 60 s in 1 min. While there are numerous types of units that we are all familiar with, there are others that are much more obscure. Have questions or comments? Be sure to cancel the units in the unit conversion correctly. Use this page to learn how to convert between kilometers/hour and meters/second. Register or login to make commenting easier. Example \(\PageIndex{2}\): Converting between Metric Units. Which factor of 10 is the scientist likely to use to describe the motion precisely? (Take this definition as a given for now. Your browser seems to have Javascript disabled. Subsequent investigations showed a piece of software called SM_FORCES (or “small forces”) was recording thruster performance data in the English units of pound-seconds (lb • s). The problem asked us to solve for average speed in units of meters per second and, after the cancelations, the only units left are a meter (m) in the numerator and a second (s) in the denominator, so we have indeed obtained these units.


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