Every summer, Mary spent sunny days out in the sun. She never wore a hat or sunscreen. When she became a teenager, Mary started lying in a tanning bed before summer arrived. By the time Mary was 25 years old, she had begun to get small sores on her arms and shoulders.

It is very likely that Mary will end up with some form of

A)
HIV/AIDS.

B)
skin cancer.

C)
bacterial infection.

D)
Parkinson's disease.

2b2t

explanation:

2b2t

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.