4. Given below is a stratage that used to draw water from well. The sound is produced while using it 184
4kg
i. what is the advantage of minimizing the frictional force on "a"?
ii. Write two methods can be used to reduce the frictional force on "a"
iii. Explain the difference between frictional force which applied on empty bucket and a bucket full of water
iv. The mass of bucket with water is 4 kg. Find the weight of it.
v. a. Calculate the acceleration of bucket which falls down due to broken of its string.
b. Calculated the force exarted on earth while the backet is touch on the earth
vi. State a method of wasting energy in this system
vii. Write the advantage of using core rope instead of nylone rope
viit Coir rope is eco freendly than the nylon rope, Explain briefly.

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

What organization and environment is described above?

Matter that emits no light at any wavelength is called