Determine whether kinetic energy is being converted to potential energy or vice versa, in the following processes.
Water cascades downward in a waterfall.

Give a common, everyday example for each of the following: An object that has zero translational kinetic energy but nonzero rotational kinetic energy.

A stretched spring stores $2.0 \mathrm{~J}$ of energy. How much energy will be stored if the spring is stretched three times as far?

A gamma-ray photon produces an electron and a positron, each with a kinetic energy of $285 \mathrm{keV}$. Determine the energy and wavelength of the photon.

Would you expect the ionization energy of $\mathrm{Li}^{+}$to be less than, greater than, or the same as the ionization energy of Li? Explain.

A gamma-ray photon produces an electronpositron pair, each with a kinetic energy of $345$ ke$\mathrm{V}$. What was the energy and wavelength of the photon?

identify each statement as true or false: The third ionization energy is the energy needed to ionize three electrons from a neutral atom.

What is the speed of a particle when its kinetic energy equals its rest energy? Does the mass of the particle affect the result?

A shopping cart moves with a kinetic energy of $40\text{ J}$. If moves at twice the speed, what would its kinetic energy be?

What causes a pendulum to eventually slow down and stop swinging?

A friction

B kinetic energy

C weight

D potential energy

What is the speed and momentum of an electron $(m_0 = 9.11\times10^{-31}$ kg$)$ whose kinetic energy equals its rest energy?

Energy is released when three $\alpha$ particles fuse to form carbon-$12$. Calculate the energy given off in this fusion reaction.

Calculate the binding energy and the binding energy per nucleon from the masses given in Table 40-1 for ${ }^{208 \mathrm{~Pb}}$.

A gamma-ray photon produces an electron and a positron, each with a kinetic energy of $375 \mathrm{keV}$. Determine the energy and wavelength of the photon.