Question

Стеклянная пробка весит в воздухе 0,5 Н,в воде 0,32 Н.Какова плотность стекла?

Answer 1

P = $\frac{m}{V}$

m - масса 
V - объём 

m = $\frac{P}{g}$

P - вес в воздухе ( 0,5 Н )
g - ускорение свободного падения ( 10 Н / кг )

m = $\frac{0,5}{10}$ = 0,05 кг 

V = $\frac{FA}{p * g}$

FA - Архимедова сила 
р - плотность жидкости ( для воды 1000 кг / м³ )
g = 10 H / кг 

FA = Р в воздухе - Р в воде = 0,5 - 0,32 = 0,18 Н 

V = $\frac{0,18}{1000 * 10}$ = 0,000018 м³

p = $\frac{0,05}{0,000018}$ ≈ 2777,7 кг / м³

Answer 2

Calculation of Density of Glass

To calculate the density of glass, we can use the principle of buoyancy. The weight of an object in a fluid is equal to the weight of the fluid displaced by the object. In this case, we have the weight of the glass stopper in air and in water.

Let's denote the weight of the glass stopper in air as W_air and the weight of the glass stopper in water as W_water.

According to Archimedes' principle, the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. Therefore, the buoyant force acting on the glass stopper in water is equal to the weight of the water displaced by the stopper.

Since the buoyant force in water is equal to the weight of the water displaced, we can write the following equation:

W_water = Weight of the water displaced by the glass stopper

The weight of the water displaced by the glass stopper is equal to the weight of the glass stopper in air minus the weight of the glass stopper in water. Therefore, we can write the following equation:

W_water = W_air - W_water

Now, let's substitute the given values into the equation:

W_water = 0.5 N - 0.32 N

Simplifying the equation:

W_water = 0.18 N

Therefore, the weight of the water displaced by the glass stopper is 0.18 N.

The density of an object can be calculated using the formula:

Density = Mass / Volume

In this case, we can use the weight of the water displaced by the glass stopper as the weight is directly proportional to the mass. The volume of the water displaced is equal to the volume of the glass stopper.

Therefore, we can write the following equation:

Density of glass = W_water / Volume of the glass stopper

Since we don't have the exact volume of the glass stopper, we cannot calculate the density of glass with the given information.

Please provide the volume of the glass stopper to calculate the density accurately.