# Scientists have calculated that a whale, swimming under water at a speed of 27 km / h, develops a power of 150 kW

October 13, 2021 | education

| **Scientists have calculated that a whale, swimming under water at a speed of 27 km / h, develops a power of 150 kW. Determine the strength of the water resistance to the movement of the whale.**

Initial data: V (speed of movement of the whale under water) = 27 km / h (7.5 m / s); N (the power that the whale develops) = 150 kW (150 * 10 ^ 3 W).

The force of water resistance to the movement of the whale is expressed from the formula: N = Fc * V, whence Fc = N / V.

Calculation: Fc = 150 * 10 ^ 3 / 7.5 = 20 * 10 ^ 3 N (20 kN).

Answer: The resistance of the water to the movement of the whale is 20 kN.

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