Kenny eats a snickers bar. Her body uses the candy as energy to move her muscles. What type of energy conversion is this an example of? A- Thermal to chemical
B- Chemical to mechanical
C-Chemical to thermal
D- Potential to mechanical

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.