Which of the following is a true statement regarding electron beams? electron beams have so little mass that they are unaffected by magnetic fields. ernest rutherford used electron beams to study electromagnetic fields in the late 19th century. the velocity of an electron is equal to the ratio of the electric field to the magnetic field. in a cathode-ray tube, a picture is produced by electric fields interacting with an electron beam.

If an inclined plane is 5 m long and 2 m high, what is its mechanical advantage? a. 2.5 b. 3 c. 7 d. 10

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.

Mark creates a graphic organizer to review his notes aboutelectrical force.which labels belong in the regions marked x and y?