Physics, 18.09.2019 03:20 alexlee202204
Athin film of material containing species a at a concentration of 10 mm is placed on the surface of a solid sphere with radius 2 mm. water at 25c flows past the sphere with an average velocity of 1.0 cm/s. the diffusion coefficient of species a in water is 1.0 × 10-10 m2/s. the partition coefficientfor species a in the solid relative to the fluid is 2.0. find the mass transfer coefficient for species a in water and find the flux of a from the sphere surface if the concentration of a far from the surface is zero.
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An alien spaceship is 500 m above the ground and moving at a constant velocity of 150 m/s upwards. how high above the ground is the ship after 5 seconds?
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Coal contains energy. a. light b. kinetic c. chemical d. mechanical
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Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.
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