90 chemical elements have two letters in their symbols.
Answer:
C Accelerometer
Explanation:
An accelerometer is an electromechanical device used to measure acceleration forces. Such forces may be static, like the continuous force of gravity or, as is the case with many mobile devices, dynamic to sense movement or vibrations. Acceleration is the measurement of the change in velocity, or speed divided by time.
Hpoe this Helps!
Im pretty sure it would be d.
Answer:
Heat reaction
Explanation:
Heat must be applied in order to melt a substance.