The factors in a experiment that do not change

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has:

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.