If a satelite orbits the eart at a velocity of 7.5x10 6 km/hr, (in scientific notation) this would be the same as how many ft/s?
You (singular or plural) are working on the units conversion. The fact that you have posted 6 questions on the same topic without showing any effort seems to give me the impression that you do not have the desire to master how this kind of problem can be done.
In any case, I will show you how this can be worked out, and the same procedure can be followed for the other 5 questions.
To tackle questions involving changing units, you need to find out the conversion factors, for example,
1 inch = 25.4 mm, or
1 day = 24 hours
1 hour = 60 minutes
therefore
1 day = 24 *(60 minutes) = 1440 minutes
etc.
After that, you will write down the expression to be converted:
4.5*106 km/hour
Do the conversions for km->ft and hour->seconds as follows:
1 foot = 0.3048 m, therefore
1 m = 1/0.3048 ft
1 km = 1000m = 1000/0.3048 feet
1 hour=60 minutes
1 minute = 60 seconds, therefore
1 hour = 60*60 seconds = 3600 seconds
Now do the actual conversion:
4.5 * 106 km/hr
= 4.5 * 106 * 1000/0.3048 feet/ (3600 sec)
= 4.5 * 106 *1000/(0.3048*3600) feet/second
= 4500000*1000/(0.3048*3600) feet/second
= 4.1* 106 ft/sec
Give it a try and post your answers for check if you wish.