Which of the following is the reason a lever is used in a shovel?
a. a lever is used to decrease effort force
b. a lever is used to decrease resistance force
c. a lever is used to increase resistance force
d. a lever is used to increase the effort force

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

More solar radiation is absorbed by earth’s surface than by