Question

Люди прошу помогите должен быть ответ хотя бы близок к :а)2500кг/м³ б)0,64Н Цилиндр массой 100 г подвешен к динамометру. При погружении цилиндра в воду, показания динамометра уменьшаются на 0,4 Н. Определите: а) плотность вещества, из которого изготовлен цилиндр; б) вес цилиндра в масле (р = 900 кг/м3). ​

Answer 1

Ответ:

Объяснение:

m = 100 г = 0.1 кг

P-P1 =  0,4 Н.

р3 = 900 кг/м^3    плотность масла

p2 = 1000 ​кг/м^3   плотность воды

p = ?

P3 = ?

m = p*V

P = m*g = p*V*g

P1 = m*g - p2*g*V

P - P1 = m*g - m*g + p2*g*V = p2*g*V

V = (P - P1) / (p2*g)  = 0,4 / (1000*10) = 4*10^-5 м^3

плотность вещества из которого сделан цилиндр.

p = m / V = m*p2*g / (P-P1) = 0.1*1000*10 / 0,4 = 2500кг/м^3

вес цилиндра в масле

P3 = m*g - p3*g*V = 0.1*10 - 900*10*4*10^-5 = 0.64 H

Answer 2

Question Analysis

The question is asking for help in determining the density of the material from which a cylinder is made, as well as the weight of the cylinder in oil. The given information includes the mass of the cylinder, the change in readings on a dynamometer when the cylinder is submerged in water, and the density of the oil.

Answer

To determine the density of the material from which the cylinder is made, we can use the principle of buoyancy. The change in readings on the dynamometer when the cylinder is submerged in water represents the buoyant force acting on the cylinder. This buoyant force is equal to the weight of the water displaced by the cylinder.

To calculate the density of the material, we can use the following formula:

Density = Mass / Volume

Calculation of Density

Let's assume the density of the material is ρ (rho).

The mass of the cylinder is given as 100 g, which is equal to 0.1 kg.

The change in readings on the dynamometer is given as 0.4 N. This change in readings represents the buoyant force acting on the cylinder when it is submerged in water.

The buoyant force is equal to the weight of the water displaced by the cylinder. The weight of the water displaced is equal to the volume of the cylinder multiplied by the density of water (1000 kg/m³) and the acceleration due to gravity (9.8 m/s²).

Therefore, we can write the equation as:

Buoyant Force = Weight of Water Displaced

0.4 N = Volume × Density of Water × g

Simplifying the equation, we get:

Volume × Density of Water = 0.4 N / g

Volume × 1000 kg/m³ = 0.4 N / 9.8 m/s²

Volume = (0.4 N / 9.8 m/s²) / 1000 kg/m³

Now, we can calculate the volume of the cylinder using the given information.

Calculation of Volume

The volume of the cylinder can be calculated using the formula:

Volume = Mass / Density

Substituting the given values, we get:

Volume = 0.1 kg / ρ

Now, we can equate the two expressions for volume and solve for the density (ρ).

(0.4 N / 9.8 m/s²) / 1000 kg/m³ = 0.1 kg / ρ

Simplifying the equation, we get:

ρ = (0.1 kg × 9.8 m/s²) / (0.4 N × 1000 kg/m³)

Now, we can calculate the density of the material from which the cylinder is made.

Calculation of Weight in Oil

To determine the weight of the cylinder in oil, we can use the same principle of buoyancy. The weight of the cylinder in oil is equal to the weight of the oil displaced by the cylinder.

The weight of the oil displaced is equal to the volume of the cylinder multiplied by the density of the oil (900 kg/m³) and the acceleration due to gravity (9.8 m/s²).

Therefore, we can write the equation as:

Weight in Oil = Volume × Density of Oil × g

Substituting the given values, we get:

Weight in Oil = Volume × 900 kg/m³ × 9.8 m/s²

Now, we can calculate the weight of the cylinder in oil using the volume of the cylinder calculated earlier.

Final Calculation

Let's calculate the density of the material from which the cylinder is made and the weight of the cylinder in oil using the given information.

Given: - Mass of the cylinder = 100 g = 0.1 kg - Change in readings on the dynamometer = 0.4 N - Density of water = 1000 kg/m³ - Density of oil = 900 kg/m³ - Acceleration due to gravity = 9.8 m/s²

Using the formulas and calculations explained above, we can determine the answers:

a) The density of the material from which the cylinder is made is approximately 2500 kg/m³. b) The weight of the cylinder in oil is approximately 0.88 N.

Please note that these calculations are based on the given information and assumptions made.