Question

Дельфины за промежуток времени 10 с может проплыть путь 150 м. Найдите массу дельфина, если его кинетическая энергия 9,0 кДж.

Answer 1

V=s/t=15 м/с
m=2*W/v^2=80 кг

Answer 2

Calculation of the Dolphin's Mass

To find the mass of the dolphin, we can use the equation for kinetic energy:

Kinetic Energy (KE) = (1/2) * mass * velocity^2

Given that the dolphin can swim a distance of 150 m in 10 s, we can calculate its velocity using the formula:

Velocity (v) = distance / time

Substituting the given values:

Velocity (v) = 150 m / 10 s = 15 m/s

Now, we can rearrange the equation for kinetic energy to solve for mass:

Mass = (2 * KE) / (v^2)

Substituting the given value of kinetic energy:

Mass = (2 * 9.0 kJ) / (15 m/s)^2

Converting the kinetic energy from kilojoules to joules:

Mass = (2 * 9.0 * 10^3 J) / (15 m/s)^2

Calculating the mass:

Mass = (2 * 9.0 * 10^3 J) / (15 m/s)^2 = 1200 kg

Therefore, the mass of the dolphin is 1200 kg.