Units

[Henry Krasner 1C]

What unit does J.s^(-1) translate into, and how would we use this new unit to calculate the correct unit for finding wavelength, in say, the equation of λ=h (unit of J.s^(-1)/mv?

[Summer de Vera 2C]

It translates into kgm^2/s because a joule is kgm^2/s^2, and if you divide it by 1/s, it gets to this unit.

[804994652]

1 joule = 1kg·m^2·s^-2
If you divide it by s-1. One of the 's' cancels out and you get 1kg·m^2·s^-1.

[Jchellis 1I]

Its important to remember that we use kg instead of grams for SI units. I know I always forget!

[Tatum Keichline 2B]

Joule is kgm^2/s^2, but multiplying my 1/s cancels one of the s units, making kgm^2/s

[Mhun-Jeong Isaac Lee 1B]

Just another reminder too is that Herz = s^-1. I find it helpful to convert Hz to s^-1 so that if units are being multiplied or divided, it's easier to see how things cancel out.

[Daniel Chang 3I]

a Joule multiplied by 1/s is composed of 1kgm^2/s in its simplest form

[105002507]

When do we use kg?

[Amy Dinh 1A]

When do we use kg?

We use kg when we are calculating energy, since the units are in jules (kg·m^2·s^-2)

[lukezhang2C]

It should follow e=mc^2 for photons, which is kgm^2/s^2

[duverge_maciel]

If a calculation is in Hz, does that mean it will always be a positive value?

[Kelvin Chung 1C]

Do we need to know the SI unit equivalents for each term, like the joule?

[AniP_2D]

Do we need to know the SI unit equivalents for each term, like the joule?

I am not sure if you need to know them, but for the quantum section it would extremely helpful to know that a J is equal to kg*m^2*s^-2

[Mellanie Gamero 4D]

I'm sure that it is important that you know the proper SI units for each term because there will be many problems which can be solved by canceling out, thus helping you find a corresponding answer for that problem in the simplest form.

[Drew Myers 4G]

Will there ever be a time where we need to use megagrams or gigagrams or will we likely only go as big as kilograms?

[Veronica Lu 2H]

I think for the most part it would only go as far as kilograms, but in any case, if megagrams and gigagrams were necessary I think we would be provided a formula sheet to convert the numbers.

[GEOVANNAO_3F]

If you ever forget unit conversions just remember:

K- King
H- Henry
D- Died
U- Unusually
D- Drinking
C- Chocolate
M- Milk

[PriscillaLi_3G]

Is it necessary that we put in the units while showing our work?