Calculate the energy, in electron volts, of X-rays that have a frequency of 1.0 x 1019 Hz. eV
6.3 x 10 37
4.1 x 10 4
6.6 x 10 -15
1.1 x 10 -33

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?