Radio galaxies have twin radio jets that emanate from a central core. an astronomer finds a radio galaxy whose frequency is 60 MHz. what wavelength of radio waves does the galaxy a emit? 20 m
5 m
60 m
15 m

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?