Plab3 - Introductory Mechanics Problems Laboratory...

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Introductory Mechanics Problems Laboratory 1 Skydiving Goals: Use forces and Newton’s laws to derive equations and solve problems. Identify the relations between forces, acceleration, and velocity. PROBLEM Skydiving is as close to flying as humans generally get. Skydivers first are in free fall as they accelerate after the jump. As a scientist you’ve been asked to make some calcula- tions for a skydiver (picture E. Dixon from the Skydiver’s Enclave). The skydive can be broken down into three phases. The first phase is the acceleration immediately following the jump. The second phase is the free dive at constant velocity. Then the parachute opens and the third phase continues “under canopy”. From the third phase the the diver reaches the drop zone on the ground.
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2 Skydiving The newsgroup rec.skydiving has a lot of information and links on all types of skydiv- ing. For traditional solo jumps, one exits a plane moving horizontally at about 100 mph. In the first 10 s a skydiver accelerates to about 120 mph straight down. The free dive continues at about 120 mph until it’s time to open the parachute. Once the parachute opens the descent slows to 1000 ft/min. Expert skydivers can fall more quickly than novices. During the free dive they can fall at about 180 mph, and the world record is 321 mph. With the parachute open, experts can drop at rates of up to 2000 ft/min, but typically slow down before landing. Most- Most skydivers are under 200 pounds, and there is often a weight restriction for sky- divers. At many places people over 250 pounds are normally not allowed to jump
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Plab3 - Introductory Mechanics Problems Laboratory...

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