Aball sits on top of a hill. the wind blows and the ball begins rolling down the hill. what caused the ball to start moving?

a. the wind created an unbalanced force on the ball.
b. the wind stopped all other forces acting on the ball.
c. all forces acting on the ball became equal and balanced.
d. all forces acting on the ball moved in the same direction.

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted