Planets in our solar system do not revolve around the sun in perfect circles. their orbits are more like ovals that scientists describe as which of the following?
a. revolutionary
b. rotational
c. periodical
d. elliptical

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

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?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?