Density and pressure If the temperature bottle is not filled with hot water and the cork is tightly closed, after a period of time, the cork is not easy to pull out. This phenomenon shows that when the volume is fixed, the temperature of the gas decreases and the pressure of the gas decreases______ Assuming that the external atmospheric pressure is 1.0 x 10 to the fifth power PA, the cross-sectional area of the bottle mouth is 10 cm & sup2;, and a force of at least 20 N is needed to pull out the bottle stopper, the pressure of the gas in the bottle is 0_______ Pa?

Density and pressure If the temperature bottle is not filled with hot water and the cork is tightly closed, after a period of time, the cork is not easy to pull out. This phenomenon shows that when the volume is fixed, the temperature of the gas decreases and the pressure of the gas decreases______ Assuming that the external atmospheric pressure is 1.0 x 10 to the fifth power PA, the cross-sectional area of the bottle mouth is 10 cm & sup2;, and a force of at least 20 N is needed to pull out the bottle stopper, the pressure of the gas in the bottle is 0_______ Pa?

If the temperature bottle is not filled with hot water and the cork is tightly closed, after a period of time, the cork is not easy to pull out. This phenomenon shows that when the volume is fixed, the temperature of the gas decreases and the pressure of the gas decreases___ Decrease___ Assuming that the external atmospheric pressure is 1.0 x 10 to the fifth power PA, the cross-sectional area of the bottle mouth is 10 cm 2, and it takes at least 20 N force to pull out the bottle stopper, the gas in the bottle will

How to calculate density when buoyancy is measured by spring dynamometer
Tell you the gravity in the air and the gravity in the water let you find the density of the object

Suppose that the gravity in the air is G1 and the gravity in the water is G21, calculate the mass of the object: m object = G1 / g; 2, calculate the buoyancy of the object: F floating = g1-g23, the buoyancy of the object is equal to the gravity of the object draining water, so the gravity of draining water is: g water = f floating = g1-g24, calculate the volume of draining water: V water = g water / (...)

Density and buoyancy
The density of wood and iron is 0.6 * 1000kg / m3 and 7.9 * 1000kg / m3 respectively. Put them into a 10cm deep water tank filled with water. When they are still, calculate the buoyancy of wood and iron (G is 10N / kg)

1,1,3,3,5,5,7,7... General formula
What about the general formula of 1,0, - 1,0,1,0, - 1,0?

1,1,3,3,5,5,7,7...
A(n)=n-(1+(-1)^n)/2
1,0,-1,0,1,0,-1,0...
A(n)=sin(n*π/2)

-The general formula of 1, - 3, - 5, - 7?
Such as the title

an=1-2n (n=1,2,3,...,n)

The general formula of 1 + 1.3 + 1.3.5 + 1.3.5.7 +

1*3*5*...*(2n-1)

The specific derivation steps of the square of VT - the square of V0 = 2aX

Displacement x = average velocity * time = (VT + V0) / 2 * t
And because VT = V0 + at
T = (vt-v0) / A
Put in the first formula
x=(Vt+V0)/2*(Vt-V0)/a
So there is 2aX = vt & sup2; - V0 & sup2;

In the formula V1 = V0 + at, four physical quantities are involved. Except that time t is a scalar, the other three VT, V0 and a are vectors
In linear motion, the directions of these three vectors are all on the same straight line. When the direction of one of the quantities is positive, the directions of the other two quantities are the same, take positive values, and the opposite take negative values. If the direction of the initial velocity is positive, then the following statement is correct
In a uniformly accelerated linear motion, the acceleration is a negative value
In the uniform acceleration linear motion of B, the acceleration is a positive value
In the linear motion of C with uniform deceleration, the acceleration is a negative value
No matter the uniform acceleration linear motion or the uniform deceleration linear motion, the acceleration a is negative

Choose BC
In the uniform speed change linear motion, no matter what the motion direction of the object is, as long as the acceleration is uniform, the direction of a is the same as that of V. on the contrary, the direction of a is opposite to that of V when the deceleration is uniform

What are the meanings of V and T in the formula s = 1 / 2 VT in physics

The velocity at the end of time is v

What is the difference between (S1 + S2) / 2T and (V0 + VT) / 2
seek help.
Wrong (V1 + V2) / 2

For "uniform variable speed linear motion":
1. The average velocity is obtained by dividing the sum of the displacements of two "continuous" equal time by the total time
2. The "half" of the sum of "initial velocity and final velocity" is also "average velocity"
The two are equal