Which of the following is a fundamental quantity? a)speed b)density c) length d) impulse e) angle

For the basic dimensions we'll assign:

M = mass, L = length, T = time

Speed is given by change in distance over time:

speed = L/T = LT⁻¹

Density is given by mass divided by volume, where volume is a quantity that only exists in 3 spatial dimensions:

density = M/L³ = ML⁻³

Length is quite simple:

Length = L

Impulse is given by the product of mass and velocity, where velocity is change in displacement over time:

impulse = M(L/T) = MLT⁻¹

Angle is given by arc length divided by radius:

angle = L/L = L⁰

Angles have no unit, but we still add a label to distinguish between different systems of measurement (turn, degree, radian, gradian).

We can see that length is the only quantity which isn't derived from other quantities. The correct answer is Choice C.

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!