Scientific notation, SI unit and significant digits

Tutor: None Selected Time limit: 1 Day

convert each of the following to scientific notation and SI unit with appropriate significant digits: 

1.)  6812 minutes

2.) 0.0025600007 km/hr 

3.) 1.369 MJ/ms 

Oct 22nd, 2015

Thank you for the opportunity to help you with your question!


6812 minutes = 

60* 6812 seconds = 408720 seconds

= 4.0872 * 10^5 seconds

2. 0.0025600007 km/hr 

to metres per second =

0.0025600007 * 1000/ 3600 sec

=7.111 * 10^-4 m/s

3. 1.369 MJ/ms 

To J/s

= 1.369 * 10^6 J/ 10^-3 sec

= 1.369 * 10^ 9 J/s

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 22nd, 2015

okay so... i understand the math behind it... but how do you know which units to convert to? so for the first one for example you converted minutes to seconds.. or the second one how do you know to go from KM/HR to minutes per second? 

Oct 22nd, 2015

The units to guide one is SI units. 

For example the si unit for speed is meters per second

For time the Si unit is Seconds 

For energy the Si unit is Joules

Oct 22nd, 2015

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