An object has an energy of 55 keV. What is its energy in meV

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.