Question

S=2мм2 масса 20 кг длина-? Р=8900кг/м3

Answer 1

V=m/ρ   V=Sl    sl=m/ρ   l=m/(sρ)

l=20/(0,000002*8900)≅1123,6м

Answer 2

To calculate the length, we need to know the volume (V) of the object. We can find the volume using the formula:

V = S * length

where: S = surface area = 2 mm^2 (square millimeters) V = volume length = unknown

However, we don't have the value for V (volume) yet. To find the volume, we can use the density (ρ) and mass (m) of the object. The formula for density is:

ρ = m / V

where: ρ = density = 8900 kg/m^3 m = mass = 20 kg V = volume

Now, we can rearrange the formula to solve for volume:

V = m / ρ

Substitute the given values:

V = 20 kg / 8900 kg/m^3 ≈ 0.0022472 m^3

Now, we can use the volume (V) to find the length (L):

V = S * L

Substitute the values:

0.0022472 m^3 = 2 mm^2 * L

To convert 2 mm^2 to square meters, we need to divide by 1,000,000:

2 mm^2 = 2 / 1,000,000 m^2 = 2 * 10^(-6) m^2

Now, the equation becomes:

0.0022472 m^3 = 2 * 10^(-6) m^2 * L

Solve for L:

L = 0.0022472 m^3 / (2 * 10^(-6) m^2) ≈ 1123.6 meters

So, the length of the object is approximately 1123.6 meters.