Ultraviolet light emits a total of 2.5 * 10^-17 J of light at a wavelength of 9.8 * 10^-7 m. How many photons does this correspond to?

Three identical buckets are each filled to the same level with steel ball bearings. Bucket A contains bearings that are 0.8 centimeters in diameter. Bucket B contains bearings that are 1.6 centimeters in diameter.

A child is sliding down a slide at the playground. Is the mechanical energy conserved? Why or why not? Mechanical energy is always conserved. The mechanical energy isn't conserved. Some energy is lost to gravity. The mechanical energy is conserved.

How are carbon tetrachloride and sodium chloride different from each other?

A horizontal wooden beam sags a bit when supported at its ends. In between the top and bottom surfaces is a region of

Which sentence states Newton's third law? (A.) If two objects collide, each object exerts a force in the same direction as the other. (B.) If two objects collide, each object exerts a force equal to and in the opposite direction of the other. (C.

Ovens, toasters, dryers, and heat lamps are examples of inventions that convert electrical energy to thermal energy, which is a kind of kinetic energy.

Why does Alpha Centauri appear to be yellow-white?

In order to determine speed, you must know

Which of the statements best describes the relationship between the surface of an object and the amount of friction it produces? A.) The smoother the surface of an object, the more friction it will produce. B.

Laboratory measurements show hydrogen produces a spectral line at a wavelength of 486.1 nanometers (nm). A particular star's spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude