Answer:
a.) The electric and magnetic fields are in phase with each other as they propagate through space.
Explanation:
Electromagnetic wave is a transverse wave in which magnetic field and electric field both induces each other as both changes with time
Here magnetic field induces electric field and similarly magnetic field induces electric field.
As we know that this is a transverse wave so here magnetic field and electric field lies in perpendicular planes. but they both propagate in same direction in such a wave that both fields reaches their maximum position and minimum positions simultaneously
So the correct answer is
a.) The electric and magnetic fields are in phase with each other as they propagate through space.
Use newtons second law F=ma, plug in the given values which gives us the answer of 22 kg for the mass
One of the equations of gravity is this:
![{v}^{2} = {u}^{2} + 2gh](https://tex.z-dn.net/?f=%20%7Bv%7D%5E%7B2%7D%20%3D%20%7Bu%7D%5E%7B2%7D%20%2B%202gh)
Where v = final velocity which is 7m/s
u = initial velocity which is 0 for objects falling from a height
g = acceleration due to gravity and it is approximately 10m/s^2. It's a constant so pretty much remember this number. It's positive since the work being done is caused by gravity (in other words, it's falling down). It can also be negative if the work being down is against gravity (in other words, it's going up)
h = height of object
Substitute for the values and you should have something like this
![{7}^{2} = {0}^{2} + 2 \times 10 \times h](https://tex.z-dn.net/?f=%20%7B7%7D%5E%7B2%7D%20%3D%20%7B0%7D%5E%7B2%7D%20%2B%202%20%5Ctimes%2010%20%5Ctimes%20h)
![49 = 0 + 20h](https://tex.z-dn.net/?f=49%20%3D%200%20%2B%2020h)
![h = \frac{49}{20}](https://tex.z-dn.net/?f=h%20%3D%20%5Cfrac%7B49%7D%7B20%7D%20)