Light travels at a speed of 3.00 x 10 ( to the power of 10 ) cm/s. What is the speed of light in kilometers per hour?
I tried to solve this by changing units but got confused by the exponents. The answer is 1.08 x 10 (to the power of 9) km/hr but how do they get this?
2007-10-09 13:31:52 · 3 answers · asked by Krumpits&Tea☺ 2 in Science & Mathematics ➔ Mathematics
1 km = 10^5 cm so divide by 10^5
3x10^10 = 3x10^5 km/s
1 hours = 3600 seconds so multiply by 3600 sec/hr
3x10^5 km/sec = 10800x10^5 km/hr = 1.08x10^9 km/hr
2007-10-09 13:36:35 · answer #1 · answered by nyphdinmd 7 · 0⤊ 0⤋
What's the conversion ratio?
1 cm/s = 3600 cm/hr
= 360 m/hr
= 0.36 km/hr
= 3.6 10^(-1) km/hr
So 3 x 10^10 cm/s is 3 x 10^10 x 3.6 x 10^(-1) km/hr
= 3 x 3.6 x 10(10-1) km/hr
= 1.08 x 10^9 km/hr
2007-10-09 20:43:53 · answer #2 · answered by SV 5 · 0⤊ 0⤋
30 to the tenth is 5.9049E14.
This divided by 100 would give you the number of meters -
That would be 5.9049E12
This divided by 1000 would equal - 5904900000
This could be incorrect so don't take my word for it, however, it's my guess...
2007-10-09 20:41:32 · answer #3 · answered by Anonymous · 0⤊ 1⤋