At a certain instant in time, the electric field of an electromagnetic wave in free space points in the -z direction, and the magnetic field points in the y direction. In what direction is this wave traveling

+X Direction

Explanation:

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg