About a weightlessness test? An example of total weightlessness

Let the weight gauge support the person be n, and the acceleration of the person can be known according to the meaning of the topic: a=, when it is upward, n-g=am, and n=g+am=(50*ox=ox.

When downward, g-n=am, get n'=g-am=cattle.

Scale:

When upward: kg = kg.

When downward: kg = kg.

When the elevator starts up and down, the mass of the person does not change, but the weight of the person changes due to the change of the earth's gravity.

When upward, it is overweight, f=50*( = kg.

Downwards is weightless, f=50*(kg.

The conditions are insufficient to determine the exact value.

Less than 490n when just down, >490n when just up

Weight is gravity, see the section on gravity in the physics book.

Hehe, it depends on whether it is a uniform motion or a uniform acceleration motion.

The conditions are not enough, and you have to have an acceleration at the beginning, right?

There's no way to calculate the exact number of how much you want to accelerate or accelerate to a steady level, but it's less than 50 kilograms when you're just going down, and it's more than 50 kilograms when you're just going up.

The quality remains the same. Or 50kg. The weight gauge is not sufficient.

I don't know about the acceleration, but I can simply say that it is less than 50 kilograms when it is just down, and it is more than 50 kilograms when it is just upward.

When upward, it is overweight, f=5*(10+

Downwards is weightless, f=5*(

The acceleration is infinite when starting, and the weight is infinite.

1 A density meter is an instrument that is built on buoyancy and gravity, and buoyancy is also produced due to gravity. Without gravity, a density meter cannot be used;

2 After the mercury barometer is in space, the mercury will be in the main four parts of the tube"Wandering", which cannot be measured;

3 Balance, not even gravity, how to measure mass? It can't measure the force 4 density meter can't, the principle of the density meter on the ball on the ground is tested according to the pressure at different depths. But there is no depth in space.

degree and pressure problem.

5 Barometers are no, as above, and air pressure exists because the gravitational pull of the earth binds the air (here air can be thought of as a liquid for ease of thinking).

Balances, pendulum clocks, barometers.

Weightlessness in space and pressure and gravity cannot be used.

Nothing related to gravity can be used.

Balances, gravimeters, etc., because complete weightlessness means that there is no downward acceleration, then the object is either suspended or has upward acceleration, in either case, you have no way to measure its gravity, which means that the mass after dividing by the gravitational acceleration g.

Anything that needs to detect a gravitational signal cannot be used.

When two bricks are stacked on top of each other in a flat throwing motion or free fall, if you try to apply Newton's second law to each brick in the brick's centroid coordinate system, then the brick seems to lose its gravitational force (in fact, the inertial force is exactly in equilibrium with the gravitational force), and this phenomenon is also called complete weightlessness. In the centroid coordinate system of the brick, each brick is at rest, balanced or unforced; The bricks are completely weightless, and accordingly, there is no pressure action between the two bricks.

According to the above definition, the concept of complete weightlessness is applied to the dynamic analysis of objects near the center of mass in the coordinate system of an object moving only by gravitational force.