Question
The average body and force until rod sinks completely(A) $2 \rho_{w} \lg A$(B) $\frac{\rho_{w} \lg A}{2}$(C) $\rho_{w} \lg A$(D) $\frac{\rho_{w} l A g}{3}$
Step 1
Mathematically, this can be represented as: \[F_{\text{average}} = \frac{F_{\text{initial}} + F_{\text{final}}}{2}\] Show more…
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The work done by rod against buoyant fore until rod sinks completely (A) $\rho_{w} A l^{2} g$ (B) $\frac{\rho_{w} A l^{2} g}{2}$ (C) $2 \rho_{w} A l^{2} g$ (D) Zero
A mass $m$ is at a distance $a$ from one end of a uniform rod of lenght $l$ and mass $M$. The gravitational force on the mass due to the rod is (a) $\frac{G M m}{(a+l)^{2}}$ (b) $\frac{G m M}{a(l+a)}$ (c) $\frac{G M m}{a^{2}}$ (d) $\frac{G m M}{2(l+a)^{2}}$
Gravitation
Section B
An object of mass $M$, initially at rest under the action of a constant force $F$ attains a velocity $v$ in time $t$. Then the average power supplied to the mass is : (a) $\mathrm{Fv}$ (b) $\frac{1}{2} F v$ (c) zero (d) $\frac{m v^{2}}{2 t}$
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