About 35% of the energy from the sun that reaches our atmosphere is a) reflected. b) obstructed. c) absorbed by land. d) absorbed by oceans.

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?

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.