When a satellite in a circular orbit around the earth enters the … - Vidyadip

MCQ

When a satellite in a circular orbit around the earth enters the atmospheric region, it encounters small air resistance to its motion. Then

A
its kinetic energy increases
B
its kinetic energy decreases
C
its angular momentum about the earth decreases
✓
$(A)$ and $(C)$ both

✓

Answer

Correct option: D.

$(A)$ and $(C)$ both

d
$K E=\frac{G M m}{2 r}$ $\uparrow$

Due to air resistance angular mometum will decreases $T=2 \pi \sqrt{\frac{r^{3}}{G M}},$ so option $(\mathrm{A})$ and $(\mathrm{C})$ are correct.

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