physics

posted by .

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 :)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physic basics

    Use the fact that the speed of light in a vacuum is about 3.00 x 10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1.7 hour(s). i converted 1.7 hours to secs but im stuck there and i don't know …
  2. physics

    Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
  3. physics

    Use the fact that the speed of light in a vacuum is about 3.00 108 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 4.9 hour(s)
  4. physics

    he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours.
  5. Physics

    use the face that the speed of light in a vacuum is about 3.00 x10^8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly eighteen hours
  6. hmsa

    Use the fact that speed of light in a vacum is about 3.00×10 to the 8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly 1.5 hour (s)
  7. physics... PLEASE HELP

    A typical laser used in introductory physics laboratories produces a continuous beam of light about 1.0 mm in diameter. The average power of such a laser is 0.75 mW. (i) What is the average intensity?
  8. physics

    a ruby laser emits light at wavelength 694.4nm. if a laser pulse is emitted for 12pico seconds and the energy released per pulse is 100mJ, what is the length of the pulse?
  9. Physics

    Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th Grade 7th Grade 8th Grade High School 9th Grade 10th Grade …
  10. Physics

    Hello, can someone please check my answers and tell me if they are correct?

More Similar Questions