math question help?

Question

Light travels at a speed of about 300,000 km/s

convert this value to meters per hours

what distance in centimeters does light travel in 1 us?

Answer 1

You just have to multiply by conversion values.

300000 km/s * m/1000 km * 3600 s/hr = 1080000 m/hr

300000 km/s * m/1000 km * 100 cm/m * 1000000s/us (I'm assuming you mean microsecond.

Answer 2

Work out the units first
meters/hour =
km/sec * meters/km * sec/hour.
Multiply out the units and the km and the secs cancel leaving you with meters/hour.
Thus 300,000 km/sec * 1,000 meters/km * 60 sec/hour = 1.8 * 10^9 meters/hour

For the second part: What measure of time is "1 us"?

Once you determine this, you can use the speed of light as 2.997925 * 10^10 cm/sec and multiply by seconds to get distance.
If you mean one ns (nanosecond) it would be:
2.997925 * 10^10 * 10^(-9) = 29.97925 cm.

Answer 3

You are going to have a larger number than what you started with because meters are a lot smaller than kilometers, and seconds are a lot smaller than hours (smaller units over a longer period of time)


300,000 km is equivalent to 300,000,000 meters.

Just move the decimal to the right 3 spaces because for ever one km, there is 1000 meters.


so now you know that light travels 300,000,000 m/s, but you need it to be meters per hour so:

(300,000,000 m) (60 s) (60 min)
------------------------------------------------------------------------------
(1 s) (1 min) (1 hr)


The seconds and minutes cancel out.


1,080,000,000,000 m/hour is your answer

Answer 4

speed of light= 300,000 kms/s

after conversion speed of light= 1080000000000 m/h

distance in centimeters= 108000000 cm/us

Answer 5

I think you need to times it by 60, to make it per hours.. then divide by 1 thousand to make it to meters.. then there you go: meters/hr

Answer 6

To convert multiply by 1000 m/km and 1/3600 hrs/sec.
83333 m/sec