Two race cars are traveling inthe same direction, one in front of the other, 333

Question

Two race cars are traveling inthe same direction, one in front of the other, 333 m apart, at a speed of 68.2 m/s. The driver of the car in front soundshis horn. How much time elapses before the other driver hears thehorn? (The speed of sound relative to air is 340 m/s.)




Two spaceships are traveling, one in front of the other, in thesame direction, at the same speed of 1.35 10^8 m/s relative to theearth. A laser pulse is emitted by one of the ships and isreflected back by a mirror on the other ship. The total round triptime for the laser pulse is 4.32 10^-3 s. How long wouldit take for a small landing module to travel between the ships ifits speed, relative to the ships, is 9.00 10^2 m/s? (answer inminutes) Two race cars are traveling inthe same direction, one in front of the other, 333 m apart, at a speed of 68.2 m/s. The driver of the car in front soundshis horn. How much time elapses before the other driver hears thehorn? (The speed of sound relative to air is 340 m/s.)

Explanation / Answer

Distance= Time*Velocity 2*D=(4.32*10^-3s)c D= (4.32*10^-3s)(3*10^8m/s)/2 D=648000m Time=Distance/Velocity T=64800m/(9*10^2m/s) (you can do this since thevelocity is relative to the velocity of the ships) T=720s/60=12min

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