Dust grains (r'= 1μm) in Saturn's rings are in a region of dilute ionized gas. Thus, these dust grains can pick up electrons. If the electric potential at the surface of a dust grainis400 V, determine the number of electrons on the surface of that dust grain. Assume thatthe electrons are distributed spherically and that the individual dust grains are far enoughapart that their electrons don't a ect each other.

no. dot product   =0 when vecs at right angles

radiation

explanation:

heat is transmitted by radiation

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards