Recent content by dan_bighit

i think that's probably cracked it then thanks

0.5 x 0.025 x 1.275 x 2 x 19.444 m/s^2 = 12.05N does this seem write I am not to sure thanks for your help

its all metric heres the question again kerbside weight 1360kg rolling resistance 140N per 1000kg frontal area (A) 2m^2 drag coefficient (k) 0.025 caculate the total tractive resistance when the car travels at 70 km/h on a level road? so basically i need to caculate rolling...

so 0.025 x 2m^2 x 19.444 m/s = 1.944N drag = 1.944 N this doesent seem write

no its and extra course I am taking but, its all course work based, no classroom time. the only thing i can think of that k stands for is kilos.

drag coefficiet units are k

so 0.025 x 19.444(m/s) = 0.4861 for stokes formula 0.0462 x 70^2(km/h) x 2 = 452.76N for the websites formula these are 2 diffrent answers thats where I am confused

this is the question out of the book the road wheels of a vechile are 600mm in diameter caculate the linear speed of the vechile in km/h if the wheels rotate at 560 rev/min? answer form book 63.36km/h my answer 63.3345079 which rounded up is 63.34 i know its only 0.02 out but still...

is air resistance the same as drag resistance or are they diffrent?

im abit confused now , what does the v mean. so that formula on the website is wrong ?

the book I am reading must be wrong then, is linear speed just the same as speed then

i got the formula formula form here http://www.webtec.co.uk/techinfo/equation/eqnfr/eqn01.htm i think i see where I've gone wrong because I've worked out using 0.0462 when it should have been 0.025 if you could just clarfy this ill be happy thanks for your help

ok here's the full question kerbside weight 1360kg rolling resistance 140N per 1000kg frontal area 2m(squared) drag coefficient 0.025 caculate the rolling resistance of the car? caculate the gradient resistance when the car climbs a gradient of 1/20 caculate the air resistance of the...

add them together

i can work out the rolling resistance and air resistance which is rolling resistnce = 190.4N air resistance = 452.76N what i need is a formula so i can caculate the total tractive force