What do you understand by the principle of conservation of energy? Expiain how the principle applies to: (i) an object falling from rest in vacuo, (ii) a man sliding from rest down a vertical pole, if there is a constant resistive force opposing the motion. Sketch graphs, using one set of axes for (i) and another set for (i), showing how cach form of energy you consider varies with time, and point out the important features of the graphs. A motor car of mass 600 kg moves with constant speed up an inclined straight road which rises 1.0m for every 40 m travelled along the road. When the brakes are applied with the power cut off, there is a constant resistive force and the car

What do you understand by the principle of conservation of energy? Expiain how the principle applies to: (i) an object falling from rest in vacuo, (ii) a man sliding from rest down a vertical pole, if there is a constant resistive force opposing the motion. Sketch graphs, using one set of axes for (i) and another set for (i), showing how cach form of energy you consider varies with time, and point out the important features of the graphs. A motor car of mass 600 kg moves with constant speed up an inclined straight road which rises 1.0m for every 40 m travelled along the road. When the brakes are applied with the power cut off, there is a constant resistive force and the car

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.

Question

comes to rest from a speed of 72 kmh
in a distance of 60 m. By using the
principle of conservation of energy, cál-
culate the resistive force and the decelera-
tion of the car.

67 (e) What do you understand by tdhe principle of
conServation of energy?
(b) Expiain how the principle applies to:
(1) an object falling from rest in vacuo,
(ii) a man sliding from rest down a.
vertical pole, if there is a constant
resistive force opposing the motion.
Sketch graphs, using one set of axes for
(i) and another set for (i), showing how
each form of energy you consider varies
with time, and point out the important
features of the graphs.
(c) A motor car of mass 600 kg moves with
constant speed up an inclined straight
road which rises 1.0m for every 40m
travelled along the road. When the brakes
are applied with the power cut off, there is
a constant resistive force and the car

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