a proton has a speed of 7.2 x 10 4 m/s. what is the energy of a photon that has the same wavelength as the de Broglie wavelength of this proton?

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

Which scientist was the first to propose the heliocentric model of the universe? a. aristotle b. isaac newton c. galileo galilei d. nicolaus copernicus

35 grams of salt is dissolved in 500 grams of total solution. what is the percent by mass of salt?