A pin fin of uniform, cross-sectional area is fabricated of an aluminum alloy ( 160 W/m·K). The fin diameter is 7 mm, and the fin is exposed to convective conditions characterized by 220 W/m2·K. It is reported that the fin efficiency is 0.65. Determine (a) the fin length and the fin effectiveness . Account for tip convection.

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?