Q. Calculate the work done in lifting a 560 N barbell 1.6 m above the floor? What is the potential energy of the barbell when it is lifted to this height?
Q. A proton has a mass of 1.67 x 10^-27 kg and a charge of 1.60 x 10^-19 C. What is the gravitational force on a single proton at Earth's surface?