If you push twice as hard against a stationary brick wall, the amount of work you do

Zero

Explanation:

The work done on an object is given by:

where

F is the force applied on the object

d is the displacement of the object

is the angle between the direction of the force and the displacement

In this problem, you are pushing again a stationary wall: this means that the walls does not move. As a result, the displacement is zero: d=0. Therefore, the work done is also zero: W=0.

atomic = no of protons.

mass number-atomic number = neutron number

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation: