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/sci/ - Science & Math

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2518924 No.2518924 [Reply] [Original]

Not homework.

Imagine a solar energy powered toy car. How many photons (use the Sun light as yellow) are necessary to accelerate the car until it's velocity reaches 20m/s?

>> No.2518948

Now,
the Energy of one photon (E = planck's constant * frequency).
yellow color frequency = 530*10^12
planck's constant = 6.62*10^-34

Energy of 1 photon = 6.62*10^-34*530*10^12
Energy of 1 photon = 3.5 * 10^-19

but I don't know what to do next. If I don't have the mass of the toy car, I can't get how much energy it requires (E = mv^2/2)

any hints?

>> No.2518954
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2518954

This looks suspiciously like homework, op.

>> No.2518959

depends...
mass of car?
efficiency of motor?
efficiency of solar panel?

needs more info in order to calculate...

>> No.2518961

>>2518954
It's not, believe me. I'm still on vacations

>> No.2518972

>>2518959
I love you.

We don't have the mass of the car.

We have efficiency of the circuit that attaches the solar panel to the motor (90% btw), but it was not necessary, not now.

>> No.2518995

shameless last bump.