By Crowell, Benjamin
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Of the oceans by 10 meters over a period of 10 years. ) Melting 1 kg of ice requires 3 × 103 J. 7 A bullet flies through the air, passes through a paperback book, and then continues to fly through the air beyond the book. When is there a force? When is there energy? Solution, p. 155 8 Experiments show that the power consumed by a boat’s engine is approximately proportional to third power of its speed. ) (a) When a boat is crusing at constant speed, what type of energy transformation do you think is being performed?
How would the equation and graph change if some other reference point was chosen rather than r = ∞? , one that never comes back to the planet? This velocity is called the escape velocity. Interpreting the result, does it matter in what direction the velocity is? Does it matter what mass the object has?
As we have already seen, this is described as doing positive work or doing negative work on the object. All the examples discussed up until now have been of motion in one dimension, but in three dimensions the force can be at any angle θ with respect to the direction of motion. What if the force is perpendicular to the direction of motion? We have already seen that a force perpendicular to the motion results in circular motion at constant speed. The kinetic energy does not change, and we conclude that no work is done when the force is perpendicular to the motion.
Conservation laws by Crowell, Benjamin