   Chapter 5, Problem 17P

Chapter
Section
Textbook Problem

A large cruise ship of mass 6.50 × 107 kg has a speed of 12.0 m/s at some instant. (a) What is the ship’s kinetic energy at this time? (b) How much work is required to stop it? (c) What is the magnitude of the constant force required to stop it as it undergoes a displacement of 2.50 km?

(a)

To determine
The kinetic energy of the ship.

Explanation

Given Info:

The mass of the ship is 6.50×107kg .

The speed of the ship is 12.0m/s .

Formula to calculate the kinetic energy is,

KE=12mv2

• v is the velocity of the ship
• m is the mass of ship

Substitute 6.50×107kg for m and 12.0m/s for v to find the kinetic energy of the ship,

KE=12(6

(b)

To determine
The work require to stopping the ship.

(c)

To determine
The magnitude of constant force required.

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