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## Homework Statement

The following is the equation of ideal gas law, where p is pressure (Force/Area), V is volume, n is number of moles and T is temperature in Kelvin. What is the fundamental unit of R?

pV = nRT

A. kg^−1 · m^−2 · s^ 2 · K · mol

B. kg^−1 · m^−4 · s ^2 · K · mol

C. kg · m^4 · s ^−2 · K · mol^−1

D. kg · m^2 · s ^−2 · K^−1 · mol^−1

E. R is dimensionless

The fundamental unit of acceleration a is ms^−2 . Which of the following equations is/are impossible? Give a brief justification. (t is time, v is velocity and A, B and C are dimensionless constants)

A. a = A^−2BC^4 + v /t

B. a = Cv /t

C. a = v /t

D. a = v/ t ^2

E. a = t + v /t

Which of the following is the typical mass (60 g) of a tennis ball?

A. 6 × 10^4 mg

B. 60 × 10^−1 kg

C. 600 × 10^5 µg

D. 6000 × 10^−5 g

E. 60 000 × 10^5 ng

## Homework Equations

## The Attempt at a Solution

3:

I both calculated 60g in choice A and C

but there should only be 1 answer in this q. idk what happened.

2,1: because I am a starter, i have no idea how things work in these 2 q.

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