FACULTY OF SCIENCES

DEPARTMENT OF PHYSICS

QUESTION NO$.1$:

$(4$ PoInts$)$

A block of wood weighs $80N$ in air and a block of lead weighs $120N$ when submerged in water. When both attached together, the two blocks weigh $90N$ in water $)=(1000\frac{kg}{m^3}.$ Calculate is the density of wood? $(4$ pts$.)$