Question

Hail stones do a lot of damage when they fall to the Earth and hit homes and cars with great force. They hit with great force because they A) are made of ice. B) melt as they fall to Earth. C) accelerate as they fall to Earth.

Answer 1

HELLO THERE!

Your answer is Option (C).

Every body, as they fall towards Earth, accelerates at a rate of 9.81 m/s². Since it strikes the Earth with a much more velocity, its Kinetic energy is more, due to which it causes great damage.

Let R be the radius of Earth, M be the mass of earth, and h be the height above the earth's surface from which the hail stone of mass m is falling.

G = Universal Gravitational constant.

Let g be the acceleration due to gravity on the surface of the Earth, and g₂ be the acceleration due to gravity of the stone at height h.

Now,

$g = \frac{GMm}{R^{2}}$

$g_{2}=\frac{GMm}{(R+h)^{2}}$

Dividing g₂ by g, we get a relation:

$g_{2} = g(1-\frac{2h}{R})$

Now, g is fixed (9.81 m/s² at surface), R is fixed (= 6400 km). When the stone is falling towards the Earth surface, h is decreasing, so as a result g₂ is increasing (or the stone is accelerating).

HOPE MY ANSWER IS SATISFACTORY..

Thanks!

Answer 2

Answer:

The answer is c

Explanation: