a train engine is pulling four boxcars, each of inertia m. the engine can exert a force of magnitude f on what it is pulling.

Waves that cause the most damage during an earthquake are a. surface waves c. s waves b. p waves d. ocean waves

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.

In which of these cases are the two wave points considered to be in phase with each other?