If the mans weight is 490N on earth,calculate his weight on the moon that has the gravitational force 1/2 of the gravitational force of the aerth

490 / 2= 245.

Correct.

To calculate the man's weight on the moon, we need to use the formula:

Weight = Mass * Gravity

Where:
Weight is the force of gravity acting on an object (measured in Newtons),
Mass is the object's mass (measured in kilograms), and
Gravity is the acceleration due to gravity (measured in meters per second squared).

First, we need to find the man's mass. The weight of an object on Earth can be determined by dividing the weight by the acceleration due to gravity on Earth. The acceleration due to gravity on Earth is approximately 9.8 m/s^2. So, we divide the weight on Earth (490N) by the acceleration due to gravity (9.8 m/s^2) to find the man's mass:

Mass = Weight / Gravity
Mass = 490N / 9.8 m/s^2
Mass = 50 kg

Now, to calculate the man's weight on the moon, we need to consider that the gravitational force on the moon is 1/2 of the gravitational force on Earth (1/2 * 9.8 m/s^2). So, we can use the same formula, but with the gravity of the moon (1/2 * 9.8 m/s^2):

Weight on the Moon = Mass * Gravity of the Moon
Weight on the Moon = 50 kg * (1/2 * 9.8 m/s^2)
Weight on the Moon = 50 kg * 4.9 m/s^2
Weight on the Moon = 245N

Therefore, the man's weight on the moon is 245N.