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At a distance of 25m from an isotropic 100 MHz radio source the intensity is 120W/m2.
A) What is the rms electric field at 25m?
B) What is the total power transmitted by the source?
C) Over a 2 hour period, what is the momentum given to a 4cm x 4cm surface (at the 25m distance) perpendicular to the source that reflects 3/4 of the energy?
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A 5.00-g bullet is shot through a1.10-kg wood block suspended on a string2.00 m long. The center of mass of the block rises a distance of0.45 cm. Find the speed of the bullet asit emerges from the block if its initial speed is 398 m/s.
The electric field between two parallel plates is 5 X 10^3 V/M .IF the distance between the two plates is 5mm. what is the potential difference between the plates?
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