Originally Posted by
KeepItSimpleStupid
Except that there are lots of loses. Somethat I can think of are drag, coeficient of rolling friction and wind speed and direction. Drag is going to take a major bite. Drag might be a 20-25% loss. The wind blowing against you at 15 mph or behind you influences the amount of HP required as well. You may also need to check the HP required to climb a hilll and at what incline.
Torque is going to influence how fast you can accelerate. So with units of ft-lbs/sec, you can convert that to HP too. Say you wanted to go 0-60 mph in 10 sec. You can find the distance traveled in 10 s. You also know the weight of the car and the time.
Ok so basically u are saying 1/2 x M x v^2 is correct except that I must still involve some calculation that will affect the speed right.
However in the first post u mentioned that 1 J/s = 1 watt and there are 746 W/hp but when I go to the volvo car specification website :
Volvo V50 Specifications
to convert and calculate the maximum speed that the car(T5 AWD R-Design) can travel using kinetic formula and I found that the car can only travel maximum at speed of approximately 52 km/hr. and how can it be possible?
The car has 227 hp, mass 3570 lbs which is approximately 1620kg.
So 227 hp x 734.7 = 169273.9 watt =169273.9 j/s
And 169273.9 j/s = 1/2 x 1620(M) x Velocity^2
=810 x v^2
So v^2 = 169273.9/810 = approximately 208.98
Then v will be equals to root of 208.98 which is 14.456
14.456 is in meter/s so to convert into kilometer/hr we multiply it by 3.6
so the answer is approximately 52km/hr
How can a volvo car only travel up to 52 km/hr max?