Physics, 18.07.2019 05:40 wronganswer1026
Geometrical optics. when relaxed, the lens of the human eye focuses objects at infinity onto the retina. the effective lens-retina distance is approximately 1.7 cm, and thus the focal length of the relaxed eye is also 1.7 cm. the lens-retina distance (image distance) stays fixed as the eye focuses on near-by objects, but the focal length of the lens is changed (a) by how much does the focal length change when looking at an object 25 cm away (the near point, i. e. the closest distance at which your eye can view an object in focus)? (b) a farsighted person has their near-point > 25 cm, and needs glasses to see object: s clearly nearer at hand. suppose your near-point is 50 cm. if you try to read a book held 25 cm away from you, it will be out of focus because the image of the page is not on your retina. where is the image of the page? (c) design a corrective lens that will allow you to read a book held 25 cm away. (hint inverse focal lengths add when lenses are close
Answers: 1
Physics, 21.06.2019 18:10
Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j
Answers: 2
Physics, 21.06.2019 19:30
Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s
Answers: 1
Physics, 22.06.2019 06:30
Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)
Answers: 1
Physics, 22.06.2019 07:50
Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1
Answers: 1
Geometrical optics. when relaxed, the lens of the human eye focuses objects at infinity onto the ret...
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