An automobile manufacturer decides to build a car that can accelerate uniformly from 0 to 60 mph in 20 s. In metric Units, convert these numbers to m/s. The cars mass is to be about 2,000 kilograms. What is the force required?

Question

moldybubblegum11 · Answer

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girlstudy · Answer

thats cute

osprey · Answer

approximate guess 1 mile is about 1500 metres. 60 miles is about 90,000metres 1hr is 60 mins, is 60x60 = 3600 secs speed is 90,000/3600 ~ 900/36 ~ 900/30 (rounding down ... against the rules) ~ 90/3 ~30 m/s. So it's zero to 30m/s in 20secs. that's an acceleration of 30/20 m/s per second ~1.5m/s per second. F=ma, newton's second law next ... F = 2,000x1.5 =3,000 Newtons. That's quite a "g-force". If the "boy racer"/motor sport enthusiast tried it, any passengers might very well feel it ... If I've got my approx calcs right ... http://perendis.webs.com

mrnood · Answer

0-60 in 20 s is slow even for low grade saloon cars

A high power road car can typically achieve 0-60 in <5s

an acceleration of 1g takes 2.7s 0-60

osprey · Answer

have I got my numbers mixed up somewhere ?

mrnood · Answer

No - it's just you comment about 'g-force'

You have calculated the FORCE (approx. = 300 kg in weight) - but the mass of the car is 2 tonnes

So the acceleration is not high you can see that 1.5 ms^-2 is only 1/6 of 1g