An apple falls from a tree because of gravitational attraction between the earth and apple

Let be the mass of the Earth and m be the mass of an object on its surface. If R is the radius of the Earth, then according to...

Weight of an object on the moon = 1 / 6 × Weight of an object on the Earth  Also,  Weight = Mass × Acceleration  Acceleration due to gravity, g = 9.8 m/s2  Therefore,...

F ∝ m1m​2 and F ∝ 1/d2 This hypothesis is not correct. The two bricks, like a single body, fall with the same speed to reach the ground at the same time...

(b) : The centripetal and centrifugal forces disappear, the satellite has the tangential velocity and it will move in a straight line Compare Lorentzian force on charges in the cyclotron.

(b) 0.0027 m/s2    Explanation:  When moving in the orbit, the moon balances the force on it by the earth with its uniform circular motion in the orbit resulting in centrifugal force. When...

(c) B is correct but A is wrong. EXPLANATION:  (A) is not correct because the gravitational potential inside the shell is constant =-GM/a, where a is the radius of the shell. As...

All of these EXPLANATION:  Consider a thin spherical shell and choose r = infinity where potential is zero. At infinity V = 0, E = 0. So (a) is true. At any point outside...

(c) the force of viscosity of air balances its weight Explanation:  When the raindrop starts falling the force of viscosity of air comes into action. This force is proportional to the velocity....

The earth’s angular speed decreases by 0.0016 rad/day in 100 years. Therefore the torque produced by the ocean water in decreasing earth’s angular velocity π = Iα = 2/5 mr2 × (ω – ω0)/t =...

(c) B is correct but A is wrong. EXPLANATION:  (A) is not correct because the gravitational potential inside the shell is constant =-GM/a, where a is the radius of the shell. As...