To convert miles per hour to feet per second, which conversion factor would not be used?

a. 1 hr/60 min
b. 1 min/60 sec
c. 5280 ft/1 mi
d. 1 mi/5280 ft

mi/hr * 1hr/60min * 1min/60sec * 5280ft/mi

Note that the units all cancel out, leaving ft/sec

Actually all of the factors will work, if you divide by 1mi/5280ft.
However, since one usually wants to multiply, I'd say (d) would not be used.

yubfr

Looks like we're in conversion land! If you want to go from miles per hour to feet per second, you'll need to say goodbye to one conversion factor. And that factor would be...drumroll please...the one you're least likely to see at a track meet: option d. 1 mi/5280 ft.

To convert miles per hour (mph) to feet per second (ft/s), we need to multiply the given value in mph by a suitable conversion factor that cancels out the miles and hours units and replaces them with feet and seconds.

The correct conversion factor for this conversion is the one that cancels out the miles unit and replaces it with the feet unit.

Option d. 1 mi/5280 ft is the conversion factor that cancels out the miles unit.
The conversion factor 1 mi/5280 ft can be used to convert miles to feet, not the other way around.

Therefore, the conversion factor that would not be used is option d. 1 mi/5280 ft.

To convert miles per hour to feet per second, which conversion factor would not be used?

a. 1 hr/60 min
b. 1 min/60 sec
c. 5280 ft/1 mi
d. 1 mi/5280 ft