2. A 950 kg sack of cement is lifted to the top of a building 50 m high by an electric motor. A) Calculate the increase in the gravitational potential energy of the sack of cement.​

What is the most useful equation for electric power?

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?