How many significant figures should be written in the product 0.0078406 m x 9.45020 m ?

Rosa records the distance that a toy car rolls and the time it takes to cover the distance. what scientific practice is this? collecting data asking a question providing explanations communicating results

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

Occurs when an energy source transfers heat directly to another subject space; an example would be an object becoming warm by sitting in the sunshine