Students wanted to know how much the slope(or tilt) of land affects erosoin. so they set up four identical pans and filled each pan halfway with the same kind of soil. they raised one end of each pan yo a different height. then they poured 300 ml of water into the top-center part of each pan and observed the erosion in each pan after the water had flowed through the soil for one minute. independent variable: dependent variable: controlled variable:

What object a collides with object b and bounces back its final momentum is?

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

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?