For a steady two-dimensional flow, identify the boundary layer approximations. A. The velocity component in the flow direction is much larger than that in the normal direction.
B. The temperature and velocity gradients normal to the flow are much greater than those along the flow direction.
C. The temperature and velocity gradients normal to the flow are much less than those along the flow direction.
D. The velocity component in the flow direction is much less than that in the normal direction.

Explanation:

For a steady two-dimensional flow the boundary layer approximations are The velocity component in the flow direction is much larger than that in the normal direction and The temperature and velocity gradients normal to the flow are much greater than those along the flow direction

assuming Vx ⇒ V∞ ⇒ U and Vy ⇒ u from continuity equation we know that

Vy << Vx

b. latent learning (the word "latent" itself means something that exists but isn't obvious, only under certain conditions! )

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .