Add the KE increase and the work done against friction.
The final velocity is twice the average, or 3.0 m/s
The final KE is (1/2)*25*3^2 = 112.5 J
The friction work done is 6*3.8 = 22.8 J
hope this is correct
D or b you chose because it can go any way
Answer:
Ice is the solid state of water, a normally liquid substance that freezes to the solid state at temperatures of 0 °C (32 °F) or lower and expands to the gaseous state at temperatures of 100 °C (212 °F) or higher.
Explanation:
The radio waves have a very low frequency so they will always have a very low energy.
Good luck :)
The missing question is: how many photons are produced per second?
Answer:
Explanation:
The energy of a photon is given by
where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
In this problem, the photons have wavelength
, so each photon has an energy of
The total energy emitted by the bulb in 1 second is
E = 100 J
Therefore, the number of photons emitted per second is
