MCQ
Cofficient of performance of refigerator is
- A$\frac{{{Q_1}}}{W}$
- B$\frac{{{W}}}{Q_1}$
- ✓$\frac{{{Q_2}}}{W}$
- D$\frac{{{W}}}{Q_2}$
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[Given: $\pi=22 / 7, g=10 ms ^{-2}$, density of water $=1 \times 10^3 kg m ^{-3}$, viscosity of water $=1 \times 10^{-3} Pa$-s.]
$(A)$ The work done in pushing the ball to the depth $d$ is $0.077 J$.
$(B)$ If we neglect the viscous force in water, then the speed $v=7 m / s$.
$(C)$ If we neglect the viscous force in water, then the height $H=1.4 m$.
$(D)$ The ratio of the magnitudes of the net force excluding the viscous force to the maximum viscous force in water is $500 / 9$.