Question

Help! I will fan everyone who helps!

Answer 1

What are the common measurements for distance, time, gravity, weight, mass, and velocity.

Answer 2

I believe that weight is newtons, distance is kilometers, time is seconds, and gravity is m/s^2. Am I right on these?

Answer 3

I think so, if by "common measurements" you mean standard units, which would be S.I. units.

Answer 4

Yeah, also what about mass and velocity?

Answer 5

You can denote the units for a variable like m for mass by using square brackets [ ].

So [m] = kg would be read as "the variable m (for mass) has the units of kilograms". At least for S.I. units.

[v] = m/(s^2) (meters per second squared, assuming v is the variable for velocity).

Answer 6

Thanks! Could you help me with something else?

Answer 7

What would I need to calculate the mass of a object?

Answer 8

and what would be the formula?

Answer 9

Well that depends on the object, really.

But if you use the density formula density = mass / volume, you would need the volume or length of the object as well as the density of the object to calculate the mass.

That might seem kind of obvious for most objects. But if you wanted to calculate the mass of a black hole or a galaxy then it might not be so obvious that you just use the density formula.

Answer 10

what about if your trying to calculate the mass of a pen?

Answer 11

Well if you know the weight W and the gravitational constant g you could use W = m*g.

Answer 12

so would it be W/G= M to figure out the mass?

Answer 13

Yep! And you can check that the units make sense:

[ W ] = (kg*m)/(s^2) <--- Unit of force (Newtons, N)

[ g ] = m/(s^2) <--- Unit of acceleration

So you divide W by g and all you're left with is kg (the S.I. unit for mass) in the numerator.

Answer 14

I think that is it. Thanks a lot!!!!!!!!!!! C: You really helped me understand!

Answer 15

Happy to help!