Answer:
The magnitude of the free-fall acceleration at the orbit of the Moon is 
(
, where 
).
Explanation:
According to the Newton's Law of Gravitation, free fall acceleration (
), in meters per square second, is directly proportional to the mass of the Earth (
), in kilograms, and inversely proportional to the distance from the center of the Earth (
), in meters:
(1)
Where:
- Gravitational constant, in cubic meters per kilogram-square second.
- Mass of the Earth, in kilograms.
- Distance from the center of the Earth, in meters.
If we know that 
, 
and 
, then the free-fall acceleration at the orbit of the Moon is:
The mass of the astronaut is still 65 kilograms. Mass is constant or doesn't change no matter where you are.
I believe it is speed.
Hope this helps!
Answer:
<em>The minimum pressure car tire pressure is 300,000 Pa</em>
Explanation:
<u>Pressure</u>
It's a measure of the force exerted by an object per unit surface:
Where F is the force applied on a surface area A.
We are given the total weight of a car with passengers as Ft=30,000 N and we also know the area of contact of each tire with the ground as 
.
The minimum pressure each tire can have is when the total weight is evenly distributed in all four tires, thus F=Ft/4=7,500 N.
Calculating the pressure:
P=300,000 Pa
The minimum pressure car tire pressure is 300,000 Pa
