In the following problems, assume the following parameters: Mass of the bottom steel disc: 1.468 kg.
Mass of the upper steel disc: 1.479 kg.
Mass of the upper aluminum disc: 0.461 kg.
Radius of each disc: 63.3 mm.
Radius of the take-up spool: r= 1.25 cm.
Mass of the falling weight: 25 grams.
1. Using the values given above, calculate the following:
A. The moment of inertia of the lower, steel disc.
B. The moment of inertia of the upper, steel disc.
C. The moment of inertia of the upper, aluminum disc.
D. The combined moment of inertia of the two steel discs.
2. Using the results of problem 1, what percentage error is made by neglecting mr with respect to l in equation (101)?
3. Suppose that the counter is reading 400 counts per second at some moment. What is the value of co at that moment?

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r