Physics 2012 JAMB Past Questions - Question 8: A rocket is fired from the earths surface to a distant planet.By Newtons law of universal gravitation,the force F will

Correct Answer

A

Explanation

BY Newton's law of universal gravitationF=GMIM2/r2ThusI F increase as GA increasesii F increases as m increasesiii F decreases as r increasesor F increases as r decreasestherefore F x I/r2
Newton's law of universal gravitation describes the force of gravity between two objects with mass. The law is expressed by the formula:

F = (G * m1 * m2) / r^2

Where:
- F is the force of gravity between the two objects.
- G is the gravitational constant, a constant value that doesn't change.
- m1 and m2 are the masses of the two objects (in this case, the Earth and the rocket).
- r is the distance between the centers of the two objects.

So, when a rocket is fired from Earth's surface to a distant planet, the force of gravity (F) between the rocket and Earth will depend on the masses of the rocket and Earth, as well as the distance between them. As the rocket moves away from Earth's surface, the distance (r) will change, and thus, the force of gravity between the rocket and Earth will change. The force of gravity will decrease as the rocket gets farther from the Earth.

Keep in mind that when a rocket is fired into space, other factors come into play, such as the gravitational influence of the distant planet and the rocket's thrust. These factors will affect the rocket's trajectory and speed, but the basic principles of Newton's law of universal gravitation still apply.