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However, because the difference between wet and dry is half-a-second at 30 MPH and one second at 60 MPH, and because dividing by two is easier than three, we can use a correctable rule of thumb: t ≈ v 20 + 1 (general rule of thumb) {\displaystyle \color {Sepia}{t\approx {\frac {v}{20}}+1\quad {\text{(general rule of thumb)}}}} (instead add 2 ...
E.T. (elapsed time) In drag racing, the total time a run has taken from start to finish. E.T. slip In drag racing, a slip of paper turned in by the race timer which denotes elapsed time for both drivers, and who won the race; it may also include reaction time and 60-foot time. This is an official document used for timekeeping. Also known as a ...
Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.
32–38 mph 50–61 km/h 13.9–17.1 m/s 13–19 ft 4–5.5 m Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind; spindrift begins to be seen Whole trees in motion; inconvenience felt when walking against the wind 8 Gale, fresh gale 34–40 knots 39–46 mph 62–74 km/h 17.2–20.7 m/s
[1] [2] He measured elapsed time with a water clock, using an "extremely accurate balance" to measure the amount of water. [note 1] The equations ignore air resistance, which has a dramatic effect on objects falling an appreciable distance in air, causing them to quickly approach a terminal velocity. The effect of air resistance varies ...
Some authorities regard two seconds as inadequate, and recommend a three-second rule. [4] German law requires a minimum 0.9 second distance but when tested under relaxed conditions [5] researchers found that their test subjects spent 41% of the test time at following distances under 0.9 seconds.
Even when equipped with the safest cars on the road, these casualties occurred at much lower speeds than in head-on collisions, with passenger fatality and serious injury typically occurring at 50 km/h (~31 mph) in side impact collisions, as opposed to 70 km/h (~43 mph) for frontal impacts. [2]
When they used the Beast to T-bone the actual car from the movie at 50 miles per hour (80 km/h), the MythBusters (to their shock) achieved the opposite result: A simulated cadaver placed between two 350 lb (159 kg) simulated policemen (crafted by Adam and Jamie out of foam and rubber, then filled with water) in the backseat sustained more ...