Answer:
,
Explanation:
The frequency can be found by means of the next expression:
(1)
Where c is the speed of light, is the wavelength and is the frequency.
can be isolated from equation 1:
(2)
Notice that is necessary to express the wavelength in meters:
---
Replacing those values in equation (2) it is gotten:
But
So, the frequency of the photon is .
The energy of a photon is defined as:
(3)
Where h is the planck's constant, c is the speed of light and is the wavelength.
Hence, the energy of the photon is .
So we want to know what kind of magnets do we have in the electric motor. So the central rotor is usually the electromagnet and the field magnet is usually the permanent magnet. This is characteristic for most small electric motors. So the correct answer would be D) permanent magnets, electromagnet.
Answer:
6 m/s
Explanation:
12m / 2s = 6 m/s
Hope that's the answer you seek.
M=F/A
Which means 30 divided by 5 m/s is 6kg(mass)