$$\overset{\underset{\mathrm{def}}{}}{=}$$, Unit Conversions Example: A Short Drive Home, $$\mathrm{average \; speed} = \cfrac{10.0\;\mathrm{km}}{20.0\;\mathrm{min}}.$$, $$= 0.500 \cfrac{\mathrm{km}}{\mathrm{min}}.$$, $$\mathrm{average \; speed} = 0.500\;\cfrac{\mathrm{km}}{\mathrm{min}} × \cfrac{60\;\mathrm{min}}{1 \mathrm{h}}$$, $$= 30.0\;\cfrac{\mathrm{km}}{\mathrm{h}}.$$, $$\cfrac{\mathrm{km}}{\mathrm{min}} × \cfrac{1\;\mathrm{hr}}{60\;\mathrm{min}}$$, $$= \cfrac{1}{60}\cfrac{\mathrm{km\;.hr}}{\mathrm{min}^2},$$, $$30.0\cfrac{\mathrm{km}}{\mathrm{h}} × \cfrac{1\;\mathrm{h}}{3,600\;\mathrm{s}} × \cfrac{1,000\;\mathrm{m}}{1\;\mathrm{km}},$$, http://cnx.org/contents/031da8d3-b525-429c-80cf-6c8ed997733a@9.74. Physics » The Nature of Physics » Physical Quantities and Units, Suppose that you drive the 10.0 km from your university to home in 20.0 min. Some hummingbirds beat their wings more than 50 times per second. Have questions or comments? Identify the metric prefix that corresponds to this factor of 10. In equation form, $$Average\; speed = \frac{Distance}{Time} \ldotp \nonumber$$, Substitute the given values for distance and time: $$Average\; speed = \frac{10\; mi}{20\; min} = 0.50\; \frac{mi}{min} \ldotp \nonumber$$, Convert miles per minute to meters per second by multiplying by the conversion factor that cancels miles and leave meters, and also by the conversion factor that cancels minutes and leave seconds: $$0.50\; \frac{\cancel{mile}}{\cancel{min}} \times \frac{1609\; m}{1\; \cancel{mile}} \times \frac{\cancel{1\; min}}{60\; s} = \frac{(0.50)(1609)}{60}\; m/s = 13\; m/s \ldotp \nonumber$$. However, other pieces of software that used these values for course corrections expected them to be recorded in the SI units of newton-seconds (N • s), as dictated in the software interface protocols. For example, there are 12 in. Because the wings beat so fast, the scientist will probably need to measure in milliseconds, or $$10^{-3}$$ seconds. km/h to m/s – unit conversion from kilometer/hour to meter/second Km/h to m/s or km/hr to m/s conversion: To convert km/hr value to m/s value just multiply the km/hr value with 5/18 and get the value in m/s. The answer does seem reasonable. Missed the LibreFest? So for a quick approximation, halve the original number twice, then add #10# %. This is a lesson from the tutorial, The Nature of Physics and you are encouraged to log in or register, so that you can track your progress. Then we can get the average speed into the desired units by picking the correct conversion factor and multiplying by it.

Why? ›› Quick conversion chart of km/h to m/s. $$\mathrm{Average\;speed} =$$$$30.0\cfrac{\mathrm{km}}{\mathrm{h}} × \cfrac{1\;\mathrm{h}}{3,600\;\mathrm{s}} × \cfrac{1,000\;\mathrm{m}}{1\;\mathrm{km}},$$, $$\mathrm{Average\;speed} = 8.33\;\cfrac{\mathrm{m}}{\mathrm{s}}$$. The correct conversion factors are those that cancel the unwanted units and leave the desired units in their place.

The answer 30.0 km/hr does indeed have three significant figures, so this is appropriate. Note: Average speed is distance traveled divided by time of travel. - A batmobile is moving with a constant velocity toward the north. $$\mathrm{average \; speed} = \cfrac{10.0\;\mathrm{km}}{20.0\;\mathrm{min}}.$$$$= 0.500 \cfrac{\mathrm{km}}{\mathrm{min}}.$$.