The particles in a gaseous substance can move easily because the a. particles are free to move
b. containing vessel is to big
c. force between them is weak
d. particles are moving with great speed

Aball horizontally thrown from a cliff at 8m/s

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.

Thermal radiation gets its name because