no way to tell
what is his mass?
what is his weight on earth?
something, eh?
what is his mass?
what is his weight on earth?
something, eh?
g = w / m,
where g is the gravitational constant, w is the weight of the astronaut, and m is the astronaut's mass.
In this case, the weight of the astronaut is given as 128 newtons. However, we need the mass of the astronaut to proceed further. If you provide the mass of the astronaut, I can calculate the Moon's gravitational constant for you.
F = (G * m1 * m2) / r^2
Where:
F is the force of gravity
G is the gravitational constant
m1 and m2 are the masses of the two interacting objects
r is the distance between the centers of the two objects
In this case, we know the force of gravity felt by the astronaut on the moon's surface (128 newtons). We also know the mass of the astronaut (which we can assume to be constant) but we need the mass of the moon to calculate the gravitational constant.
Unfortunately, we don't have enough information to calculate the gravitational constant without knowing the mass of the moon. The gravitational constant itself is a fundamental constant and does not change.