Um caixote de 4,0 kg é lançado da base de um plano inclinado com uma energia cinética inicial de 16 J. Ao longo da subida do plano, de 30° de inclinação, a força de atrito vale 30% do peso do caixote. Nestas condições, calcule a distância
percorrida pelo caixote até parar.

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?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.

Heterogeneous mixture with larger particles that never settle is