Student Guide (continued) Table C: Known Specific Heat Values for Common Materials
Material
Specific Heat
(J/g*C)
% Error
(deviation from known)
Water
4.18
Concrete
0.88
Wood
1.80
Aluminum
0.90
Glass
0.84
Sand
0.83
Steel
0.49
Iron
0.44
Copper
0.38
Lead
0.16
Gold
0.13

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs. 

Explanation:

The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs. 

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3