Question 1 :
A mass of 6 × 10²⁴ kg is to be compressed in a sphere in such a way that the escape velocity from the sphere is 3 × 10⁸ m/s. Radius of the sphere should be </br>(G = 6.67 × 10^–11 N – m²/kg²)

Question 4 :
If density of earth increases 4 times and its radius becomes half of what it is, our weight will:

Question 6 :
Gas escapes from the surface of a planet because it acquires an escape velocity. The escape velocity will depend on which of the following factors : <br> I. Mass of the planet <br> II. Mass of the particle escaping <br> III. Temperature of the planet <br> IV. Radius of the planet <br> Select the correct answer from the codes given below :

Question 7 :
Three bodies A, B and C are thrown simultaneously with the same speed&#160; from the top of a building. A is thrown vertically upward, B horizontally and C,&#160; vertically downward. All the three, on reaching the ground,&#160; <br/>

Question 8 :
The sum of the time of ascent and the time of descent in a projectile motion is called<br/>

Question 10 :
what newton observed when he saw apples tends to move downward when they get detached from the plant, which kind of force it was?