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questionasker1
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An Aerodynamic (friction-less) car takes about 270 Newtons of force to maintain a speed of 25m/s.
How much horsepower is required from the engine to maintain that speed?
How much horsepower is required for the same car to accelerate from 0-25m/s in 6 seconds?
I thought it was a pretty easy problem then I realized I couldn't divide joules by any sort of time.
Ek=(1/2)(1000kg)(25m/s)^2 which gets me 25,000J, but power is J/t and I only have J, I somehow need to figure out how much time it takes to maintain 25 m/s from a force of 270N or have time in somewhere and I tried saying
270N = 1000kg * 25m/s * (1/t), which gave me 270s when I solved for t. Is that a coincidence or is that some mathematical tautology that tells me nothing?
It says 25m/s, can I just assume I divide by 1 second? Or what? How do I get a time from this to calculate power?
Thanks.
How much horsepower is required from the engine to maintain that speed?
How much horsepower is required for the same car to accelerate from 0-25m/s in 6 seconds?
I thought it was a pretty easy problem then I realized I couldn't divide joules by any sort of time.
Ek=(1/2)(1000kg)(25m/s)^2 which gets me 25,000J, but power is J/t and I only have J, I somehow need to figure out how much time it takes to maintain 25 m/s from a force of 270N or have time in somewhere and I tried saying
270N = 1000kg * 25m/s * (1/t), which gave me 270s when I solved for t. Is that a coincidence or is that some mathematical tautology that tells me nothing?
It says 25m/s, can I just assume I divide by 1 second? Or what? How do I get a time from this to calculate power?
Thanks.