A steel block with a density of 7800 kg/m3 is suspended from a string in a beaker of water so that the block is com-
pletely submerged but not resting on the bottom. The block
is a cube with sides of 3 cm (0.03 m).
a. What is the volume of the block in cubic meters?
b. What is the mass of the block?
c. What is the weight of the block?
d. What is the buoyant force acting on the block?
e. What tension in the string is needed to hold the block in
place?

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.