How many nanoseconds does it take light to travel a distance of 6.40 km in vacuum?

Answer;

= 21333 Nanoseconds

Explanation;

Distance = Speed x Time  

S = V x T  

( Here S = 6.40 km = 6400 m, V = 300000000 m/s, T = ?)  

6400 = 300000000 x T  

6400 / 300000000 = T  

=> T = 0.000021333 seconds

Convert seconds to nanoseconds  

1 second = 1000000000 nanoseconds  

Therefore,

T = 0.000021333 x 1000000000 nanoseconds  

T = 21333 Nanoseconds

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

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