Space Time & Motion A.2 Forces & Momentum (id: 1b6aaef48)

本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学

[填空题]
1.A small glass marble ofg;6ndb7tkslz,+c *:xfic8o whz3 g17 ;i5wmlo5itq 1zars3a mass $5.0g$ is dropped into the ocean.

The following data are available:

The radius of the marble = $5.0\times {10}^{-3}m$
The average density of sea water = $1.03\times {10}^{3}kg{m}^{-3}$
The viscosity of the sea water = $1.1\times {10}^{-3}Pas$

(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. $F_{buoyant}$ =    $\times {10}^{-3}N$
(3) Determine the speed $v$ that is would be obtained using Stokes' Law in this situation. $v$ =    $m{s}^{-1}$
(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 $9.2\times {10}^{2}m$. Calculate the pressure of the ocean on the ocean floor. $P$ =    $\times {10}^{7}Pa$

参考答案:
空格1: 5.25±2%  空格2: 424±2%  空格3: 1.2±2% 


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