So, what is the answer of this assignment?

Which best describes why a physical change differs from a chemical change? A. A physical change predicts the behavior of a substance when in a reaction, whereas a chemical change is used to identify characteristics of a substance. B.

Where does the energy that is used to ride a bicycle up a hill come from and how is it classified?

A. Calculate the diffraction limit of the human eye, assuming a wide-open pupil so that your eye acts like a lens with diameter 0.8 centimeter, for visible light of 500-nanometer wavelength. Express your answer using two significant figures. B.

A box is being pushes across a room with a force of 150 N. if the box was moved 5 m, how much work was done

What evidence supports the ages of our planets, moon, sun, and asteroids

Which wave characteristic has the unit hertz

A stretched spring has 5184 J of elastic potential energy and a spring constant of 16,200 N/m. What is the displacement of the spring?

A block of mass 1.3 kg is resting at the base of a frictionless ramp. A bullet of mass 50 g is traveling parallel to the ramp surface at 250 m/s. It collides with the block, enters it, and exits the other side at 100 m/s.

Metals are good thermal conductors - that is, when there is a temperature difference across their ends, they transfer energy very efficiently from the higher temperature end to the lower temperature end.

Some stars are so far away that their light hasn't reached Earth yet. A million years in the future, will the sources of light we see when we look up at night be the same? Why or Why not?