Question

1.пустотіла мідна статуетка у повітрі важить 71,2 Н .Визначити обєм порожнини якщо вага статуетки ц воді 56,8 Н 2.Для піднімання з дна озера гранітної брили прикладають зусилля 2,4 кН.Який обєм брил Помогите пожалуйста

Answer 1

F=m*g-Fa=p*V*g-pж*V*g=V*g*(p-pж)  V=F/g*(p-pж)=2400/10*(2500-1000)=0,16 м3

Answer 2

Calculating the Volume of the Cavity in the Copper Statue

To calculate the volume of the cavity in the copper statue, we can use the given information that the weight of the hollow copper statue in the air is 71.2 N and its weight in water is 56.8 N.

The volume of the cavity can be calculated using the formula: \[ \text{Volume of cavity} = \frac{\text{Weight in air} - \text{Weight in water}}{\text{Density of water}} \]

Given: - Weight in air = 71.2 N - Weight in water = 56.8 N - Density of water = 1000 kg/m³ (or 1000 N/m³)

Using the given values, we can calculate the volume of the cavity in the copper statue.

Calculating the Volume of the Cavity: \[ \text{Volume of cavity} = \frac{71.2 - 56.8}{1000} \]

\[ \text{Volume of cavity} = \frac{14.4}{1000} \]

\[ \text{Volume of cavity} = 0.0144 m³ \]

Therefore, the volume of the cavity in the copper statue is 0.0144 cubic meters.

Determining the Volume of the Granite Block

To determine the volume of the granite block being lifted from the bottom of the lake, we can use the given force applied to lift the block, which is 2.4 kN.

The volume of the granite block can be calculated using the formula: \[ \text{Volume} = \frac{\text{Force}}{\text{Density}} \]

Given: - Force = 2.4 kN (or 2400 N) - Density of granite = 2750 kg/m³ (or 2750 N/m³)

Using the given values, we can calculate the volume of the granite block.

Calculating the Volume of the Granite Block: \[ \text{Volume} = \frac{2400}{2750} \]

\[ \text{Volume} \approx 0.8727 m³ \]

Therefore, the volume of the granite block is approximately 0.8727 cubic meters.