Thermofluids -- A fireboat carries out a turning manoeuvre

[Gaby]

Homework Statement

THERMOFLUIDS

Q3 (a) When a fireboat carries out a turning manoeuvre (i.e. a curvilinear motion) it is known to tilt about its axis. In which direction will the tilting occur, and why? (5 marks)

I think I need to reference the forces that are acting on the boat in my specific simple design.

(b) Why does a fireman progress more slowly when running through marshland, or sandy ground, than on hard ground? (5 marks)

I think I need to reference energy conservation, the energy spent by the fireman, for fixed energy per time, how it is spent or conserved.

(c) When a bullet hits a thin walled glass, it is known to make two holes: one through which the bullet enters the object and one through which it exits. However, when the glass is filled with water, it is known to be shattered by the same bullet. Why does this happen? (5 marks)

I think this question is about compressibility of fluid.

(d) A body floats on water. With the water being in a quiescent state, half of the body is submerged. What fraction of body volume will be submerged into water when water vessel will move with acceleration: - upward or downward? (10 marks)

Relevant Equations

Not sure.

I would be greatful for any hints and guidance on how to approach these question, thanks.

 

[haruspex]

Q3 (a) When a fireboat carries out a turning manoeuvre (i.e. a curvilinear motion) it is known to tilt about its axis. In which direction will the tilting occur, and why? (5 marks)

I think I need to reference the forces that are acting on the boat in my specific simple design.

Ok, so what are they? And what is its acceleration?
(You can choose between an inertial reference frame or the frame of reference of the fireboat.)

(b) Why does a fireman progress more slowly when running through marshland, or sandy ground, than on hard ground? (5 marks)

I think I need to reference energy conservation, the energy spent by the fireman, for fixed energy per time, how it is spent or conserved.

So post an actual attempt.

(c) When a bullet hits a thin walled glass, it is known to make two holes: one through which the bullet enters the object and one through which it exits. However, when the glass is filled with water, it is known to be shattered by the same bullet. Why does this happen? (5 marks)

I think this question is about compressibility of fluid.

Yes... go on...

(d) A body floats on water. With the water being in a quiescent state, half of the body is submerged. What fraction of body volume will be submerged into water when water vessel will move with acceleration: - upward or downward? (10 marks)

What are your thoughts on that one? Have you drawn a free body diagram (FBD)?

 

[Gaby]

Thanks! will work on this