Jamara wants to create an insulating container made with a plastic box surrounded by a layer of liquid. The liquids that she can choose from are: ethanol, with a specific heat of 2.4 J/g°C; water, with a specific heat of 4.2 J/g°C; and seawater, with a specific heat of 3.9 J/g°C. She decides to use ethanol. Did she choose the best liquid for thermal insulation? Why or why not?

If you were to drop a rock from a tall building, assuming that it had not yet hit the ground, and neglecting air resistance. what is its vertical displacement (in m) after 6 s?

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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.