One situation indicates a physical change rather than a chemical change. which situation indicates a physical change?
a) solid copper melts to form liquid copper.
b) a firecracker explodes on the fourth of july.
c) water reacts with the iron on your bicycle to form rust.
d) magnesium metal is mixed with hydrochloric acid and hydrogen gas is formed. eliminate

Animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

When a pendulum is held high and taut and then is released, the pendulum begins to swing. what’s the correct order of the energy transformations in this example? (pe stands for potential energy.)