Carrie is making a presentation on solar winds. Her notes of the steps that must occur for solar winds to form are below. 1. The stream of electrically charged particles collide with gas atoms, causing the latter to give off light. 2. The electrically charged particles flow outward in all directions as far as Saturn. 3. The stream of electrically charged particles flows outward from the corona. 4. The particles of the solar wind flow along lines of the magnetic field. Which shows the correct sequence in the formation of solar winds? 1, 2, 3, 4 2, 3, 4, 1 3, 2, 4, 1

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

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.