Figure 11 shows the three-pin plug used to connect the kettle to the mains. earth pin
fuse

A fault occurs in the kettle causing the live wire to touch the metal case of the kettle.
Explain how the safety features of the plug operate when this fault occurs.

For both the fuse and the earth wire:
How are they set up?
What happens when there is a fault?
Why are they used?​

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

wavelength divides in half and speed stays the same.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

3. dark matter

empty space could also be a simple vacuum