Question (3)
Given data
The mass of the ship is m = 5.95 x 107 kg
The initial speed of the ship is u = 11 m/s
(A)
The expression for the ship's kinetic energy is given as:
Substitute the value in the above equation.
Thus, the initial kinetic energy is 359.975 J.
(B)
Given data
The final speed of the ship is v = 0
The expression for the work required to stop is given as:
Substitute the value in the above equation.
Thus, the work done to stop the ship is 359.975 x 107 J.
(C)
The amount of work done is always equal to the change in kinetic energy.
The mechanical energy summation of kinetic energy and potential energy. The potential energy is neglected.
Thus, the work is equal to the mechanical energy.
(D)
Given data
The displacement of the ship is d = 2.75 km = 2750 m
The expression for the force required to stop the ship is given as:
Substitute the value in the above equation.
Thus, the force required to stop the ship is 1309 x 103 N.
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