Exam_2_2006_A4_key - EAS 1600 INTRODUCTION TO ENVIRONMENTAL...

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EAS 1600 - INTRODUCTION TO ENVIRONMENTAL SCIENCES Fall, 2006 Exam 2 – 10/27/06 < Answer all Questions < Show all your work and be sure and report units where appropriate < Place your name on each page < This is a closed-book exam; all are expected to comply with Georgia Tech Honor Code I am aware and in compliance with the Georgia Tech Honor Code Signature: ____________________________________________________________ Print Name: ___________________________________________________________ Lab Section: ___________________
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1. How does photosynthesis export atmospheric CO 2 to the deep ocean? (5 pts) Plants use sunlight to make organic material by combining water and carbon dioxide and in the process make oxygen (photosynthesis). But phytoplankton is denser than water, so eventually they sink and decompose (releasing CO2) in deeper waters. 2. You are at the beach for spring break and decide to shoot a bullet into the air. If the bullet falls back to Earth what is its velocity just before it hits the ground. You can assume the bullet is a sphere with a diameter of 1 cm and a density of 10 g cm -3 . (10 pts) W D = g V v A bullet bullet air ρ ρ = 2 4 . 0 2 3 2 3 4 2 3 2 2 8 . 9 ) 10 5 . 0 ( 14 . 3 3 4 10 1 2 . 1 ) 10 5 . 0 ( 14 . 3 4 . 0 s m m m kg v m kg m × × × × × = × × × × × s m v / 87 . 36 = if they used r = 1 cm then v = 52.1 m/s (8 points) 3. An air parcel contains a cloud with 20 grams of ice. As the air parcel descends the
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