Why does heat cause a substance to expand? i. heat causes the substance's atoms or molecules to move faster. ii. the substance gets larger because it converts heat to mass. iii. heat drives water into the spaces between atoms or molecules.

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)

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