An am radio station broadcasts isotropically (equally in all directions) with an average power of 3.80 kw. a receiving antenna 75.0 cm long is at a location 4.00 mi from the transmitter. compute the amplitude of the emf that is induced by this signal between the ends of the receiving antenna.

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2