Aroller coaster has a mass of 250 kg. it drops from rest at the top of a hill that's 88 m tall. how fast is it going when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2.
a.41.5 m/s b.13.1 m/s c.52.2 m/s d.70.0 m/s

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.

4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.