An electromagnetic wave is propagating towards the west. at a certain moment the direction of the magnetic field vector associated with this wave points vertically up. the direction of the electric field vector of this wave options:
vertical and pointing down.
vertical and pointing up.
horizontal and pointing north.
horizontal and pointing south.
horizontal and pointing east.

Horizontal and pointing south.

Explanation:

The Poynting vector points in the direction of propagation (if the wave is a sinusoidal linearly polarized plane wave of fixed frequency, as it is in our case), and it's given by (all vectors):

where points in the same direction as , the magnetic field. This means that must point south, because the vectorial product of a vector pointing south by a vector pointing up gives a vector pointing west. This can be deduced by the right-hand rule: if our index finger is and our middle finger is , then the thumb is .

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

option number c is the right answer.