Beach sand grains are approximately spherical with radius of 50 microns (μm), and are mostly silicon dioxide, meaning their density is 2600 kg/m^3. find the mass of sand that would have the same surface area (total surface area of all spheres) as a cube of side length 1.0 m.

260 g

Explanation:

Given:

Let n be the number of such silicon dioxide that would give the desired mass of sand.

According to the question, the surface area of all the sand particles will be equal to the surface area of the cube.

Let the total mass of sand required be M.

Hence, the total mass of the sand required will be equal to the 260 g.

a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?

explanation:

the masses of the objects and the distance between them