Question

While driving in your car you notice that your car’s speedometer is not working, thus being a clever physics student you deduce the speed of the car from its rev meter. If the radius of the car is 35 cm and the rev meter reading is 800 rpm. What is the linear velocity of the car

Answer 1

Answer:

1.832 m/s.

linear speed v=r.2πn

v=(0.35x2x3.142x800)÷60

=1.832 m/s

Answer 2

Answer:

The linear velocity of the car in km/hr is $105.5km/hr$.

Explanation:

Given the radius of the car, $r= 35 cm=0.35m$

                         frequency,  $n= 800 rpm$  

Linear velocity of the car,

                      $v=r\omega=r2\pi n$

                         $=0.35\times 2\times 3.14\times \frac{800}{60}$    

                         $=29.3 m/s$

Velocity, in km/hr is

                        $29.3\times \frac{18}{5}=105.5km/hr$

Therefore, the linear velocity of the car in km/hr is $105.5km/hr$