Assignment 7 physics

The diameter of a pipe is tripled while the pressure difference across the pipe remains the same. The volume flow rate of the pipe increases by a factor of

81

When a fluid is in steady - state flow and its path bends, the pressure on the outside of the bend is always

Higher than the pressure on the inside of the bend.

At what place in or near the jet engine is gas moving the fastest relative to the flying airplane?

In the plume of exhaust gas flowing out of the engine's outlet duct

When a fish hovers over the bottom of a lake, what forces act on it, and what is the net force?

Lift and weight, for a net force zero.

Which of the following would cause a household fan to stall?

both a and b

A curve ball's path bends to the right as it flies toward home plate because it is experiencing an aerodynamic force to its right. One reason why the ball is experiencing this aerodynamic force is that the ball is spinning and that spin

causes the air to flow more rapidly around the right side of the ball than around the left side of the ball.

Aerodynamic forces consist of

drag and lift.

As the Reynolds number decreases,

flow is going from being viscous dominated to inertia dominated and therefore turbulent

Flowing honey is less likely to become turbulent than flowing water b/c

honey's large viscosity favors laminar flow.

A curve ball in baseball curves because of

lift forces

A fan can be used to circulate air around a room. The pressure at the inlet side of the fan is

more than the pressure at the outlet side.

If a golf ball were smooth rather than dimpled, it would

not travel as far after being hit by a golf club.

Fluids have viscosity because

the atoms and molecules within the fluid interact with each other, producing internal frictional forces.

The four things that affect the amount of water flowing through a hose are

water viscosity, hose length, inlet and outlet pressures and hose diameter.