Physics, 11.11.2019 18:31, princessjsl22
So-called "no-limits" free divers slide to deep water on a weighted sled that moves from a boat down a vinyl-coated steel cable to the bottom of a dive site. the diver reaches depths where a soda can would implode. after reaching the target depth, the diver releases the sled and an air bag opens and brings the diver quickly back to the surface. the divers have no external oxygen supply-just lungs full of air at the start of the dive. consider a person that made a 209.6-m free dive in the red sea. the dive took 3 minutes 28 seconds. he began the dive with his 9-l lungs full of air. by the time he passed the 200-m mark, his lungs had contracted to the size of a tennis ball. his body transferred blood from his limbs to essential organs such as the heart, lungs, and brain. this "blood shift" occurs when mammals submerge in water. blood plasma fills the chest cavity, especially the lungs. without this adaptation, the lungs would shrink and press against the chest walls, causing permanent damage. when he reached his target, he released the weighted segment of the specialized sled that had taken him down and opened an airbag, which began his return to the surface at an average speed of 3-4 m/s. assuming the person weighs 670 n (150 lb) and is 1.80 m tall, 0.30 m wide, and 0.15 m thick. find to the magnitude of the force that the deep water exerted on face side of his body. assume that normal pressure is 105n/m2 and density of water in the red sea is 1025kg/m3.
Answers: 1
Physics, 21.06.2019 19:30, denysmayatskyy
A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?
Answers: 1
Physics, 21.06.2019 23:00, alanisalvarez2000
Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.
Answers: 1
Physics, 21.06.2019 23:00, yourgirlnevaeh
For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.
Answers: 1
So-called "no-limits" free divers slide to deep water on a weighted sled that moves from a boat down...
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