Here's the design information for the roller coaster: . The track has two hills. The mass of a roller coaster car with passengers is 850 kilograms. The first hill is 50 meters high. . There are 320 meters of track between the top of the first hill and the top of the second hill. Label the drawing of the roller coaster system with the information above. Label the height of the second hill with question mark. Edmentrum/ Plato
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The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?