Abug makes 30 jumps on the surface of the water each minute. what is the frequency of the waves he produces (in hertz)?

Positrons are spontaneously emitted from the nuclei of

As seen in a us weather map, the h (or high) and l (or low) symbols indicate regions where surface air pressures are high or low, respectively, compared to surrounding areas. an h is plotted where the air pressure is highest and an l is plotted where the air pressure is lowest. proceeding outward and away from the center of a high pressure system, the air pressure "

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving