Brlan is repairing an old alarm clock. He needs to replace a device that converts the electric energy into sound energy. Which o
f these devices
should he use?
OA.
O B.
C.
battery
buzzer
motor
Switch
should he use?
OA.
O B.
C.
battery
buzzer
motor
Switch
1 answer:
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To solve this problem we will apply the concept related to the kinetic energy theorem. Said theorem states that the work done by the net force (sum of all forces) applied to a particle is equal to the change experienced by the kinetic energy of that particle. This is:
Here,
m = mass
v = Velocity
Our values are given as,
Replacing,
Therefore the mechanical energy lost due to friction acting on the runner is 907J
To solve this problem we will apply the concepts related to Frequency (Reverse to Period) and the description of the wavelength as a function of the speed of light at the rate of frequency.
Our Laser frequency is given as
Therefore the laser wavelength would be
Where,
c = Speed of light
f = Frequency
The laser pulse is emitted at a period (T) of
Therefore the pulse wavelength would be
Finally the number of wavelengths is the ratio between the two wavelengths, then
The number of wavelengths in the beam length is closer to