Emma asked in Science & MathematicsPhysics · 6 months ago

The speed of light in a vacuum is 2.998 x 10⁸ m/s. What is the speed in km/hr?

5 Answers

Relevance
  • MyRank
    Lv 6
    2 months ago

    Given,

    Speed of light in vacuum (c) = 2.998 x 10⁸m/s 

    Now, convert m/sec into km/hr 

    2.998 x 10⁸m x 1km x 3600sec / sec x 10³m x 1hr = (2.998 x 10⁸ x 1 x 3600 / 10³ x 1) km/hr = 10792.8 x 10⁸⁻³km/hr = 10792.8 x 10⁵km/hr ≈ 1.08 x 10⁹km/hr 

    ∴ Speed (v) = 1.08 x 10⁹km/hr.

    • Login to reply the answers
  • 6 months ago

    The following conversion factors are used to convert km/h to m/s

    1 km = 1000 m

    1hr = 3600 s

    1km/h = 1000/3600 = 5/18 m/s

    Since you need to convert m/s to km/h, invert this fraction.

    1 m/s = 18/5 = 3.6 m/s

    To convert m/s to km/h, multiply 3.6.

    v = 2.99 * 10^8 * 3.6 = 1.08 * 10^9 km/h

    I hope this is helpful for you.

    • Login to reply the answers
  • oubaas
    Lv 7
    6 months ago

    V = 3.0*10^8*3.6 = 1.08*10^9 km/h

    • Login to reply the answers
  • 6 months ago

    actually it is 299,792,458 m/s exactly

    299,792,458 m/s x 1 km/1000 m x 3600 s/hr = 1 079 252 848.8 km/hr

    • Login to reply the answers
  • How do you think about the answers? You can sign in to vote the answer.
  • Anonymous
    6 months ago

    Use google to convert from one unit to another.

    • Login to reply the answers
Still have questions? Get your answers by asking now.