PLEASE HELP EASY PHYSICS!!?

1) The statement of Professow White "WE DONT NEED SO MUCH FUEL FOR THE RETURN TRIP - THE ROCKET WILL HAVE LESS MASS ON MARS" is not correct.

Mass of a body is always constant. It does not change with position or location or acceleration.

It is the weight of body that changes with acceleration due to gravity.

Weight , W = mass * acceleration due to gravity

W = mg

When g varies weight of a body vary.

Fuel needed for return trip will be less due to the less value of escape velocity on Mars because of the smaller size and mass of Mars.

2)

Weight on Earth,W = 50 N

acceleration due gravity on Earth,g =9.81 m/s^2

so mass, m = W/g = 50/9.81 = 5.09 kg

The scale reads in Kg. This means it is adjusted to measure mass on Earth in kg.

i.e., it will measure mass of fire extinguisher as 5.09 kg though it weighs 50 N (5.09 * 9.81).

So weight of fire extinguisher on Mars, W' = 1.9 * 9.81 = 18.64 N

hence acceleration due to gravity on Mars can be found.

g' = W' / m = 18.64 / 5.09 = 3.66 m/s^2

acceleration due to gravity on Mars = 3.66 m/s^2

1 - Is MASS defined by gravity, or a constant?? Once you know that answer, you can answer the question.

2 - Find your formula dealing with gravity, mass, weight, etc.

The fire extinguisher didn't change (something), so set those two parameters equal in the equation. You know the acceleration due to gravity on earth, and what the scales read,

Use the formulas to find the unknowns.

1) False. It won't have less MASS, it will have less WEIGHT, as there is less gravity. Mass is made up of our matter (e.g. atoms, particles, etc). This doesn't change.

2) Don't know what you want to work out. "The acceleration of what?" was the first question in my head.