Four friends write a description of pitch.

Jessica: Pitch is how high or low a sound is. The pitch depends on vibrations. High pitch sounds have low amounts of vibrations.
Rachael: Pitch describes how high or low a sound is. Sounds are caused by vibrations. The more vibrations, the higher the pitch.
Harvey: Pitch is caused by vibrations. The more vibrations, the lower the pitch of the sound.
Derek: Pitch is how high or low a sound is. All sounds have mostly the same pitch.

Who has the best description of pitch? (2 points)

Jessica
Rachel
Harvey
Derek

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

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.