Use the fact that the speed of light in a vacuum is about 3.00x1000 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1 h
How many seconds are there in 1 hour if there are 60min/hr and 60sec/min?
Then 1hr = 60min/hr x 60sec/min = ?
Then use d=r*t where r is the speed of light and t is the time in seconds you calculated above.
You also need to observe how many meters there are in 1 kilometer:
1km=1000m
i think it is 120 second
well, lets check that...nope
120sec is still only 2 minutes.
The question was asking for a distance, not a time. We multiply the 60min/hr x 60sec/min to get 3,600 sec/hr.
I might also mention that in the original question we need to be aware of how many significant digits the answer should be given with. I think there were only 2 decimal places given for the velocity of light.
i guess i am not sure ok what grade are you going to
Anastasia, well my children are nearly college age so I suppose grade levels don't matter anymore :)
To find out how many kilometers a pulse from a laser beam travels in exactly 1 hour, we first need to determine the time in seconds. We know that there are 60 minutes in an hour and 60 seconds in a minute. So, we can calculate the time in seconds by multiplying the number of minutes by 60.
1 hour = 60 minutes/hour * 60 seconds/minute = 3600 seconds/hour.
Now, since we have the time in seconds and the speed of light in a vacuum is about 3.00x10^8 m/s, we can use the formula distance = speed * time (d = r * t) to find the distance traveled by the pulse.
However, the question asks for the distance in kilometers, so we need to convert the distance from meters to kilometers. There are 1000 meters in 1 kilometer.
Now we are ready to calculate the distance:
distance = speed of light * time = (3.00x10^8 m/s) * (3600 seconds) = 1.08x10^12 meters.
To convert this distance from meters to kilometers, we divide by 1000:
distance in kilometers = (1.08x10^12 meters) / (1000 meters/kilometer) = 1.08x10^9 kilometers.
Therefore, a pulse from a laser beam travels approximately 1.08x10^9 kilometers in exactly 1 hour.