4.A 1000 kg cube of aluminum is placed in a container. Mercury is now slowly added until the normal force is zero. How deep is the layer of mercury

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

magnified images possible images can be real = projected onto a screen

laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.