Aroller coaster reaches its maximum potential energy when it

a. is sitting at the top of a hill.
b. reaches the bottom of a hill.
c. rounds a curve.
d. starts up a hill.

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Will mark brainliest how many electrons can be held in the energy level n = 4?