muối This is a multiple-choice question in Vietnamese about the gravitational acceleration
of an object near the surface of a planet. The question asks for the formula for
, given the planet's universal gravitational constant
, radius
, and height
from the surface.
The correct formula for gravitational acceleration at a height
above a planet's surface is derived from Newton's law of gravitation. The gravitational acceleration
at a distance
from the center of the planet is given by:
At the surface,
, so
. At a height
above the surface, the distance from the center becomes
, so the formula for
at that height is:
From the options given:
- A.
(this is the formula at the surface, not at height
)
- B.
(this is the correct formula at height
)
- C.
(same as A, incorrect for height
)
- D.
(incorrect, as the denominator should be squared, not cubed)
The correct answer is **B.
**.