[填空题]
1.A small glass marbleph -+x vffw,1d rs;zo3 of-onx/l b uf:uvonbsf: fn :3,. mass $5.0\,g$ is dropped into the ocean.
The following data are available:
The radius of the marble = $5.0\times10^{−3}\,m$
The average density of sea water = $1.03\times10^3\,kgm^{−3}$
The viscosity of the sea water = $1.1\times10^{−3}\,Pa\,s$
(1) On the diagram below, draw and label a free-body diagram of the forces on the marble when it is moving at a constant speed.
(2) Calculate the magnitude of the buoyant force acting on the marble. $F_{buoyant}$ = $\times10^{-3}\,N$
(3) Determine the speed $v$ that is would be obtained using Stokes' Law in this situation. $v$ = $ms^{-1}$
(4) The actual value of $v$ is significantly different than the calculated value in (3). Demonstrate why the calculated value is inaccurate.
2.The depth of the region where the marble was released is $9.2\times10^2\,m$. Calculate the pressure of the ocean on the ocean floor. $P$ = $\times10^7\,Pa$
