Amonochromatic plane wave of frequency 50 mhz and average inten- sity 100 w/m2 is propagating vertically downwards in a floating ice slab. the wave encounters the plane interface between the ice and the sea-water below. the relative permittivity of ice at this frequency is 3.2 and its conductivity is negligible. the relative permittivity of sea water at this frequency, at near the conductivity is about 3 s/m. w freezing temperatures, is about 86 and (a) calculate the intensity of the wave which is reflected from the interface (b) calculate the rms amplitude of the electric field of the wave transmitted into the sea water (c) calculate the distance the wave in the sea water travels before its amplitude falls to 10% of the value found in part (b)
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Physics, 22.06.2019 13:00
Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?
Answers: 1
Physics, 22.06.2019 18:30
Asmall grinding wheel has a moment of inertia of 4.0×10−5 kg⋅m2 . what net torque must be applied to the wheel for its angular acceleration to be 150 rad/s2 ?
Answers: 3
Amonochromatic plane wave of frequency 50 mhz and average inten- sity 100 w/m2 is propagating vertic...
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