Amplitude modulation is used in AM radio.
Answer is A.
Oil keeps the moving metal parts of an engine smoothly rubbing together through lubrication. Just like with other mechanical devices, energy can be lost due to friction caused by lack of proper lubrication. When an engine is running on old or insufficient oil, more friction and heat is produced between the rubbing moving parts. A decline in gas mileage follows this since the fuel takes more than usual to do the same task.
The signs of a chemical reaction are bubbles, heat an magnesium disappearing.
Answer:
the answer is A. A school crossing guard raises a stop sign that weigh 10 N
No. Speed is speed and force is force.
