Ahot air balloon is moving at a speed of 10 meters/second in the x direction. the balloonist throws a brass ball with a velocity of -2 meters/second with respect to himself. if the ball lands after 20 seconds, about how far does it land horizontally from the point at which it was released?

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

What is a carrier wave and how does it affect what you hear on the radio

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)