The potential energy of an apple is 6.00 joules. the apple is 3.00 meters high. what is the mass of the apple?

The gravitational potential energy of an object is given by

where m is the mass, g the gravitational acceleration and h the height with respect to a reference point.

Here we know the potential energy of the apple, U=6.0 J, its height, h=3.00 m, and , so we can find the mass of the apple by re-arranging the formula:

The elements which have similar behavior are Barium, strontium and beryllium.

Explanation:

Periodic table is divided into 7 periods and 18 groups.

The elements belonging to the same group will show chemical properties. Groups are the vertical columns in the periodic table.

From the given options:

Barium, strontium and beryllium, all belong to the group 2.

Silicon belong to group 14.

Aluminium belong to group 13 and Osmium belong to group 8.

Hence, the elements which have similar behavior are Barium, strontium and beryllium.