The minimum and maximum distances of a planet revolving around the Sun are x? and x?. If the minimum speed of the planet on its trajectory is v?, then its maximum speed will be :

Option 1 -

(v₀x₁²) / x₂²

Option 2 -

(v₀x₂²) / x₁²

Option 3 -

(v₀x₂) / x₁

Option 4 -

(v₀x₁) / x₂

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Two artificial satellites of masses $m_{1}$ and $m_{2}$ are moving with speeds $v_{1}$ and $v_{2}$ in orbits of radii $r_{1}$ and $r_{2}$ , respectively. If r₁>r₂ then which of the following statements is true

Raj Pandey

Two planets A and B of equal mass are having their period of revolutions T_A and T_B such that T_A = 2T_B. These planets are revolving in the circular orbits or radii r_A and r_B respectively. Which out of the following would be the correct relationship of their orbits?

Raj Pandey

According to kepler’s third law of time period –

${(\frac{T_{A}}{T_{B}})}^{2} = {(\frac{r_{A}}{r_{B}})}^{3} \Rightarrow \frac{r_{A}}{r_{B}} = 4^{1 / 3}$

$\Rightarrow r_{4}^{3} = 4 r_{B}^{3}$

The time period of satellite in a circular orbit of radius R is T. The period of another satellite in a circular orbit of radius 9R is:

Raj Pandey

T² ∝ R³
⇒ (T? /T? )² = (R? /R? )³ ⇒ T? = 9³/² T = 27T

A satellite is launched into a circular orbit of radius R around earth, while a second satellite is launched into a circular orbit of radius 1.02R. The percentage difference in the time periods of the two satellites is:

Vishal Baghel

Time period of Satellite = T = $\frac{2 π R}{v} = {(\frac{4 π^{2} R^{3}}{G M})}^{\frac{1}{2}}$

$\Rightarrow T α R^{\frac{3}{2}} \Rightarrow \frac{T_{2}}{T_{1}} = \frac{{(1.02 R)}^{\frac{3}{2}}}{R^{\frac{3}{2}}} = {(1.02)}^{\frac{3}{2}} = {(1 + 0.02)}^{\frac{3}{2}}$

The percentage difference in the time periods of the two satellites = $\frac{Δ T}{T_{1}}$ × 100

= (0.03) × 100 = 3%

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The minimum and maximum distances of a planet revolving around the Sun are x? and x?. If the minimum speed of the planet on its trajectory is v?, then its maximum speed will be :

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