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If you were to walk briefly in space without a spacesuit while far from the Sun (as an astronaut does in the movie 2001), you would feel the cold of space -- while you radiated energy, you would absorb almost none from your environment. Assume that your emmisivity is 0.90, the surface area of your body is 2.2 m2, and your skin temperature is 303 K.
(a) At what rate would you lose energy?
W
(b) How much energy would you lose in 10 s?
J
The first person is initially moving forward with a speed of 2.5m/s and second person is initially at rest. What are the velocities of the two people after the snowball is swapped? Disregard friction between the skate and the ice.
Find the critical angle for an optical fiber whose core has n value of 1.55 and whose cladding has n value of 1.20
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A molecule of DNA (deoxyribonucleic acid) is 2.28 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. Determine the effective spring constant of the molecule
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Determine the scattering angle of the photon and the electron
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