A fuel oil tank is an upright cylinder, buried so that its circular top is 12 feet beneath ground level. The tank has a radius of 4 feet and is 12 feet high, although the current oil level is only 8 feet deep. Calculate the work required to pump all of the oil to the surface. Oil weighs 50 lb/ft3.

Um vetor representa um deslocamento cujo módulo é 20 m. se v faz um ângulo de 60 graus com a horizontal, qual é o valor das componentes horizontal e vertical deste vetor?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

What will a positive and a negative charge do if they are separated from each other?