Question

Light travels at the speed of3.0x10^10 cm/sec. what is the speed of light in feet per hour?
I'm not sure on how to start it.

Answer 1

The easy way to do it is to type into Google the following:
3E10 cm/sec to mph
and hit the enter button.

Answer 2

I have other problems similar so,I would like to see the process of it.

Answer 3

Note that what I said to type into Google won't do it because I typed in cm/sec to mph and you want feet/hr.
Do all of them by dimensional analysis.
I don't know all of the conversion factor but I can get there from what I know. Sometimes it just takes a while. You ca google conversion factors and find cm in mile etc. But if I had to do it from scratch I would do this.

3E10 cm/sec to feet/hr.
First cm to miles.
There are 2.54 cm to the inch.
12 inches to the foot. That gets us to feet.

Now sec to hr.
There are 69 sec in a min
There are 60 min in an hour.

Now waht the units we don't want to keep cancel and the units we want to keep don't cancel.
3E10 cm/s x (1 in/2.54 cm) x (1 foot/12 in) x (60 s/min) x (60 m/hr) and that should give you cm/s to feet/hr. That gives me 3.54E12 ft/hr and if I type in 3E10 cm/s to ft/hr in google I get 3.54E12. So those factors must be right.