Person x pushes twice as hard against a stationary brick wall as person y. which one of the following statements is correct? a) both do positive work, but person x does four times the work of person y. b) both do positive work, but person x does twice the work of person y. c) both do the same amount of positive work. d) both do zero work. e) both do positive work, but person x does one-half the work of person y.

D) Both do zero work

Explanation:

The work done by a force is given by:

where

F is the force applied

d is the displacement

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

From the formula, we notice that work is done online when the displacement is non-zero, so when the object is moving.

In this problem, the wall is stationary: this means that the displacement is zero, d = 0, so no work is done.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.