Which electric component provides energy to the circuit of a flashlight?

battery
motor
resistor
switch

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

Ascientific blank must be testable and capable of being proven false?

What is the major limitation to the light microscope?