3. A boy with a mass of 30 kg is ice skating at a speed of 2m/s. What type of energy is he using and what are the joules?

60 joules

Explanation:

.

due to motion the boy possess kinetic energy

so,

=》

=》

=》

hence the energy he is using is 60 joules

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l