Question

if you had a block of each type of wood with the same dimensions,how would their weights compare?explain?

Answer 1

For this case we have the following equation:
 Density = mass / volume
 If the volume is the same, then the object with the greatest weight will be the one with the highest density.
 You must know the type of way to know the value of the density.
 Answer:
 The weight of the blocks will depend on the density if the volume is the same.

Answer 2

If the dimensions of the wood are the same, then it means that they have the same volume.
The weight of an object is direct proportional to the volume but now the volume is constant. 
So, if the blocks are from the same type of wood, then their weight will be the same. 
If the blocks comes from different types of wood, then the weight would differ depending with the density of each type of wood. That is, if the wood is denser then it will weigh more than less dense wood.