units

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nikitasridhar_1b
Posts: 42
Joined: Fri Apr 06, 2018 11:05 am

units

Postby nikitasridhar_1b » Tue May 08, 2018 5:02 pm

for the topics covered in test 2, what units are the equations in terms of? some of them are in kg and such but im not sure which ones

Danielle Sumilang - 1F
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

Re: units

Postby Danielle Sumilang - 1F » Tue May 08, 2018 5:15 pm

Hello!

Whenever the equation uses mass, like the kinetic energy equation and the De Broglie equation, the mass needs to be in kilograms (kg). Energy has to be in joules(J) and the wavelength must be in meters(m).

vivianndo_1L
Posts: 30
Joined: Fri Apr 06, 2018 11:02 am

Re: units

Postby vivianndo_1L » Wed May 09, 2018 3:24 pm

Use the following SI units:

-meter (m) for length
-kilogram (kg) for mass
-second (s) for time
-Kelvin (K) for temperature

There are only 7 SI units I believe and every other unit is derived from these. I only listed the ones I found relevant for this test.

Raquel Floyd 1K
Posts: 19
Joined: Wed Sep 21, 2016 2:59 pm

Re: units

Postby Raquel Floyd 1K » Fri May 11, 2018 11:53 am

The reason you would want kg for mass is because it cancels out units when dealing with joules. This is because 1J = 1(kg * m^2)/(s^2). So when dealing with the formula that gives kinetic energy, if your mass is in kg, it will cancel with the 1(kg * m^2)/(s^2) found from the joules.

Shimran Kumar 1C
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: units

Postby Shimran Kumar 1C » Fri May 11, 2018 11:24 pm

Also, velocity is used in equations as m/s so be careful to check that the info they give u is either in this form or you convert it to be.


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