Cosmic rays are charged particles, such as electrons and protons, traveling at near the speed of light. if the mass of a proton is approximately 1833 times the mass of an electron, how much more energy does the more energetic particle have than the less energetic particle? the energy of a cosmic ray particle can be found using einstein's formula e = mc^2.

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.