Give several examples of a mechanism, machine or system that has two
or more simple machines working together to complete work.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Based on the concept of the wave-like nature of light, huygens' theory of light postulates that the more light was "bent" by a substance the slower it would move while traversing across that substance. a) deflection b) interference c) refraction d) resonance

This punnett square shows the cross between two pants. one parent has round seeds (rr). and the other parent has wrinkled seeds (rr) which best describes their offspring as shown in this cross?