# A test particle is moving in a circular orbit in the gravitational field produced by a mass density p(r)= .  Identify the correct relation between the radius R of the particle’s orbit and its period T: (a) T/R is a constant (b) TR is a constant (c) T/R2 is a constant (d) T2/R3 is a constant

## Question ID - 51264 :- A test particle is moving in a circular orbit in the gravitational field produced by a mass density p(r)= .  Identify the correct relation between the radius R of the particle’s orbit and its period T: (a) T/R is a constant (b) TR is a constant (c) T/R2 is a constant (d) T2/R3 is a constant

3537

M(in) =  dr  =4 ∴        G = ⇒        v = ∴         T= = ∴ =constant

Next Question :

A man walks 1 km towards East and then he turns to South and walks 5 km. Again he turns to East and walks 2 km, after this he turns to North and walks 9 km. Now, how far his starting point ?

(A) 3 km                                            (B) 4 km

(C) 5 km                                            (D) 7 km 