When she carried out her experiment, Tanya used three small vials of the same size and two slightly larger ones. She decided that the sizes were close
enough to compare the surface tension of the liquids. ls she correct? Why or
why not?
OA. No, because the shape will not be the same when the surface area
is different.
O B. Yes, because the shape will be the same when the surface area is
different.
O c. No, because when there are more molecules, the forces between
them are weaker, changing the shape.
OD. Yes, because when there are fewer molecules, the forces between
them are stronger, maintaining the same shape.

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.

The precision of a laboratory instrument is ± 0.05 g. the accepted value for your measurement is 7.92 g. which measurements are in the accepted range? check all that apply. 7.85 g 7.89 g 7.91 g 7.97 g 7.99 g

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.