Question 1(Multiple Choice Worth 2 points) (02.04 MC)

Kris spends every day of the summer swimming in the lake behind her grandparent's house. By the end of the summer, she is having daily dizzy spells, migraine headaches, and nausea. What can Kris infer about the possible
source and reason for her illness?

A: It is an acute effect of a toxin in the lake

B: It is a chronic effect of a toxin in the lake

C: It is a synergistic reaction to a toxin

D: It is an antagonistic reaction to a toxin

hloride, what is the mass of calcium in

explanation:

the correct answer would be b) volume versus temperature, because they are also directly proportional.

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.