An electron traveling with a speed of 2.50 × 10^6 meters per second collides with a photon
having a frequency of 1.00 × 10^16 hertz. after the collision, the photon has 3.18 × 10^−18 joule of
energy.
calculate the original kinetic energy of the electron. [show all work, including the equation and
substitution with units.]

Your 249 ml cup of coffee is too hot to drink when served at 82 degree celsius. what is the mass of an ice cube taken from a -21 degree celsius freezer, that will cool your coffee to a pleasant 54 degree celsius. specific heat of the water is 4190 j/kg c, specific heat of ice is 2090 j/kg c, heat of fusion of ice is 3.33 x 10^5 j/kg

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."