Question: 3 a 14kw radio transmitter is coupled to an antenna...
3. A 1.4-kW radio transmitter is coupled to an antenna by a cable whose attenuation is 1.8 dB. How much power reaches the antenna?
(a) A newspaper is held 6 m from a 2000-cd street lamp at midnight. What is the maximum illumination of the newspaper?
(b) Find the solid angle subtended at the center of a sphere of radius 3.0 m by an area of 100 cm2 on its surface.
(a) A match 5 cm long is placed 20 cm in front of a concave mirror whose focal length is 50 cm. Find the location, size, and nature of the image.
(b) A double convex lens has surfaces whose radii are 40 cm and 50 cm. The index of refraction of the glass is 1.52. Find the focal length of the lens.
6. A horizontal pipe 3.5 cm in radius is joined to a pipe 14 cm in radius.
(a) If the velocity of seawater in the small pipe is 6 m/s and the pressure in there
is 8x10^5 Pa, find the velocity and pressure in the large pipe.
(b) What is the rate of flow through the pipe?