The mass of Venus is 
Explanation:
The gravitational acceleration at the surface of a planet is given by:
where:
is the gravitational constant
M is the mass of the planet
R is the radius of the planet
For Venus, we know that:
is the radius of the planet
is the gravity at the surface
Solving the equation for M, we find Venus mass:
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17
What would the scale read? zero
18 In free fall you are being pulled by a gravity. "Truly" weightless presumably happens in deep space where there is nothing to pull you.
19 coasters accelerate down to simulate weight loss/zeroised. As do NASA planes,
Roller coasters are for fun seekers. NASA is for science
That's efficiency. There's no law that it must be stated in percent.
