To understand the formula representing a traveling electromagnetic wave.

light, radiant heat (infrared radiation), x rays, and radio waves are all examples of traveling electromagnetic waves. electromagnetic waves comprise combinations of electric and magnetic fields that are mutually compatible in the sense that the changes in one generate the other.

the simplest form of a traveling electromagnetic wave is a plane wave. for a wave traveling in the x direction whose electric field is in the y direction, the electric and magnetic fields are given by

e? =e0sin(kx? ? t)j^,

b? =b0sin(kx? ? t)k^.

this wave is linearly polarized in the y direction.

1.

a. in these formulas, it is useful to understand which variables are parameters that specify the nature of the wave. the variables e0 and b0are the of the electric and magnetic fields.

choose the best answer to fill in the blank.

1. maxima

2. amplitudes

3. wavelengths

4. velocities

Part f - example: finding two forces (part i) two dimensional dynamics often involves solving for two unknown quantities in two separate equations describing the total force. the block in (figure 1) has a mass m=10kg and is being pulled by a force f on a table with coefficient of static friction îľs=0.3. four forces act on it: the applied force f (directed î¸=30â above the horizontal). the force of gravity fg=mg (directly down, where g=9.8m/s2). the normal force n (directly up). the force of static friction fs (directly left, opposing any potential motion). if we want to find the size of the force necessary to just barely overcome static friction (in which case fs=îľsn), we use the condition that the sum of the forces in both directions must be 0. using some basic trigonometry, we can write this condition out for the forces in both the horizontal and vertical directions, respectively, as: fcosî¸â’îľsn=0 fsinî¸+nâ’mg=0 in order to find the magnitude of force f, we have to solve a system of two equations with both f and the normal force n unknown. use the methods we have learned to find an expression for f in terms of m, g, î¸, and îľs (no n).

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground

What happens when you slowly pulled the carboard?