For flow in a pipe, the Reynolds number is defined as Re=(VpD)/mu))
Where V is velocity, is density, is viscosity, and D is diameter. Expressed this way, the Reynolds number can be interpreted as

the ratio of viscous to inertial forces.
the ratio of inertial to viscous forces.
the ratio of momentum flux to viscous forces.
the ratio of kinetic energy to viscous forces.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

An ascending elevator, hanging from a cable, is coming to a stop. part a part complete identify all forces acting on the elevator from the list below. select all that apply. select all that apply. kinetic friction normal force tension weight static friction submitprevious answers correct part b draw a free-body diagram of the object. draw the vectors starting at the black dot. the location and orientation of the vectors will be graded. the exact length of your vectors will not be graded but the relative length of one to the other will be graded.