Caculating linear speed of a vehicle

[dan_bighit]

i need a formula for caculating linear speed of a vehicle.

the question is

wheel diameter 1.075 metres

what is the linear speed of the vehicle when the wheel is rotating at 300 rev/min?

thanks dan

 

[Hootenanny]

Do you know any expressions for relating angular frequency to tangential velocity?

 

[dan_bighit]

no don't what that is, but i do know what angular velocity and angular acceleration is.

i thought linear speed was diameter(metres) x pie x rev/min x 60 / 1000 would give you the speed in km/h

which would give the answer 60.79 km/h

but turns out its wrong.

 

[Hootenanny]

no don't what that is, but i do know what angular velocity and angular acceleration is.

i thought linear speed was diameter(metres) x pie x rev/min x 60 / 1000 would give you the speed in km/h

which would give the answer 60.79 km/h

but turns out its wrong.

Your answer looks good to me. If your entering your answers on webassign, beware of the number of significant figures you include.

 

[dan_bighit]

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

 

[Hootenanny]

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

Yes, just out of interest, what speed does your book return?

 

[dan_bighit]

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 that why i wasent sure

 

[Hootenanny]

I agree with your answer.