A rising bubble viscometer consists of a glass vessel that is 30 cm deep. It is filled with a liquid at constant temperature having a density of 1260 kg/m3. The time necessary for a bubble
having a diameter of 1 cm and a density of 1.2 kg/m3 to rise 20 cm up the center of column of
liquid is measured as 4.5 s. Calculate the viscosity of the liquid.

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

What is a costume plot? why is it important to a film or theater production?