Question

A viscous damper consists of a sliding piston and a cylinder filled with oil of kinematic viscosity $5\times {10}^{-5}{m}^2/s.$ A damping force of 20 N is applied on the piston and the steady state velocity reached is 10 mm/s. The damping co-efficient of the damper is

• A. 2 Ns/mm
• B. 4 Ns/mm
• C. 10 Ns/mm
• D. 20 Ns/mm

Answer 1

The correct option is A 2 Ns/mm

The damping coefficient of the damper (D) is given as:

$D=\frac{Force}{Velocity}$

$=\frac{20N}{10mm/sec}=2Ns/mm$