Answer to Question #270723 in Classical Mechanics for kyungsoo

Question

A car has a drag coefficient C_{d} = 0.30

Cd

​=0.30, a frontal area of A=1.9 m

2

 

and a mass 1.2 tonnes. The density of air is 1.2 kg.m^{-3}

−3

.

i) What is the drag force when it is traveling at v=110 kph 

in a straight line? F_{drag} =

Fdrag

​= _____  N 

.

Hint: Retain accurate values until the final calculation, but remember significant figures.

Answer 1

$F_d=C_d\frac{\rho v^2}2A=319~N.$