consider the physical quantities with dimensions: s = l, v = lt^{-1}, a = lt^{-2}, and t = t. determine…

consider the physical quantities with dimensions: s = l, v = lt^{-1}, a = lt^{-2}, and t = t. determine whether each of the equations below are dimensionally consistent.\n(a) v^{2}=2as\n(b) s = vt^{2}+0.5at^{2}\n(c) v = s/t\n(d) a = v/t\n(e) s=int adt
Answer
Explanation:
Step1: Recall dimension - analysis rules
We substitute the dimensions of each quantity into the equations and check if the dimensions on both sides match.
Step2: Analyze equation (a)
For $v^{2}=2as$, the dimension of $v$ is $LT^{-1}$, so the dimension of $v^{2}$ is $(LT^{-1})^{2}=L^{2}T^{-2}$. The dimension of $a$ is $LT^{-2}$ and the dimension of $s$ is $L$. Then the dimension of $2as$ is $(LT^{-2})\times L = L^{2}T^{-2}$. Since the dimensions of both sides are the same, the equation is dimensionally consistent.
Step3: Analyze equation (b)
For $s = vt^{2}+0.5at^{2}$, the dimension of $v$ is $LT^{-1}$, and the dimension of $t$ is $T$, so the dimension of $vt^{2}$ is $(LT^{-1})\times T^{2}=LT$. The dimension of $a$ is $LT^{-2}$, so the dimension of $at^{2}$ is $(LT^{-2})\times T^{2}=L$. The left - hand side has dimension $L$, but the first term on the right - hand side $vt^{2}$ has dimension $LT$, so the equation is not dimensionally consistent.
Step4: Analyze equation (c)
For $v = s/t$, the dimension of $s$ is $L$ and the dimension of $t$ is $T$. So the dimension of $s/t$ is $L/T = LT^{-1}$, which is the same as the dimension of $v$. The equation is dimensionally consistent.
Step5: Analyze equation (d)
For $a = v/t$, the dimension of $v$ is $LT^{-1}$ and the dimension of $t$ is $T$. So the dimension of $v/t$ is $(LT^{-1})/T=LT^{-2}$, which is the same as the dimension of $a$. The equation is dimensionally consistent.
Step6: Analyze equation (e)
For $s=\int adt$, the dimension of $a$ is $LT^{-2}$ and the dimension of $dt$ is $T$. So the dimension of $\int adt$ is $(LT^{-2})\times T = LT^{-1}$, which is not the same as the dimension of $s$ ($L$). The equation is not dimensionally consistent.
Answer:
(a) Dimensionally consistent (b) Not dimensionally consistent (c) Dimensionally consistent (d) Dimensionally consistent (e) Not dimensionally consistent