Problem 4: During a snowball fight two balls with respective masses of 1.6 and 0.4 kg are thrown in such a manner that they meet with their velocities forming a 30° angle.
After the collision, the two snowballs combine to form a single mass. The speed of each
snowball just before the collision is 15 m/s.
(a) The speed of the combined snowball immediately after collision is
(b) The kinetic energy of the combined snowball (with mass 2 kg) is

What produces a record of seismic waves? richter scale seismogram barometer seismograph

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.