Conceptual Physics: The High School Physics Program
Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Chapter 9, Problem 13A

In what sense is energy from coal actually solar energy?

Expert Solution & Answer
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To determine

To Explain:

The sense in which energy from coal is actually solar energy.

Explanation of Solution

Introduction:

One of the famous examples of fossil fuel is Coal. Coal is black brownish in color. It is a rock thatcontainsa high proportion of carbon. In today’s time, around 60-70% of energy is fulfilled by fossil fuel. But due to the high emission of toxic gases, it creates lots of problems too. In the future, these sources will not be able to fulfill the energy demand of society. Nowadays, people look at the energy sources which are free from pollution, are low cost, and environment friendly. Solar energy is one of the renewable energy sources, which is free from pollution and is environment friendly. In solar energy, energy from the sun can be utilized to fulfill certain needs. The device used to convert solar energy into the most usable form is a solar cell.

Coal isa non-renewable source of energy.However, one might be amazed to know that the energy from the coal is actually solar energy. In the early days, many parts of the earth were covered with forest, but due to natural processes such as flooding, these plants were buried underneath the soil. The plants were compressed because of the presence of excessive soil. Excess soil increases the temperature of the plant. Due to these processes,the plantswere protected from oxidation and biodegradation.So at the end under high temperature and pressure, these dead plants or vegetables slowly converted into the coal.

However, solar energy is essential for plant growth. The energy from the sun is gained through the process of photosynthesis. In photosynthesis, light energy from the sun is converted into chemical energy.So this chemical energy gained from the sun is still available after the death of plants and is converted into coal.

Conclusion:

Energy gainedfrom the sunis converted into chemical energy whichis still available after the death of plants and converted into coal.

Chapter 9 Solutions

Conceptual Physics: The High School Physics Program

Ch. 9 - What will be the kinetic energy of an arrow having...Ch. 9 - What does it mean to say that in any system the...Ch. 9 - In what sense is energy from coal actually solar...Ch. 9 - How does the amount of work done on an automobile...Ch. 9 - In what two ways can a machine alter an input...Ch. 9 - In what way is a machine subject to the law of...Ch. 9 - What does it mean to say that a machine has a...Ch. 9 - In which type of lever is the output force smaller...Ch. 9 - What is the efficiency of a machine that requires...Ch. 9 - Distinguish between theoretical mechanical...Ch. 9 - What is the efficiency of her body when a cyclist...Ch. 9 - In what sense are our bodies machines?Ch. 9 - Prob. 23ACh. 9 - What is the ultimate source of geothermal energy?Ch. 9 - Can we correctly say that a new source of energy...Ch. 9 - The mass and speed of three vehicles are shown...Ch. 9 - Consider these four situations. (A) a 3-kg ball at...Ch. 9 - A ball is released at the left end of the metal...Ch. 9 - The roller coaster ride starts with the car at...Ch. 9 - Rank the efficiency of these machines from highest...Ch. 9 - Prob. 31ACh. 9 - Rank the scale readings from greatest to least....Ch. 9 - Calculate the work done when a force of 1 N moves...Ch. 9 - Calculate the work done when a 20-N force pushes a...Ch. 9 - Calculate the work done in lifting a 500-N barbell...Ch. 9 - Calculate the watts of power expended when a force...Ch. 9 - Calculate the power expended when a 20-N force...Ch. 9 - How many joules of potential energy does a 1-kg...Ch. 9 - Calculate the increase in potential energy when a...Ch. 9 - Calculate the number of joules of kinetic energy a...Ch. 9 - How much work is required to increase the kinetic...Ch. 9 - What change in kinetic energy does an airplane...Ch. 9 - Which requires more work: stretching a strong...Ch. 9 - Two people who weigh the same amount climb a...Ch. 9 - A physics teacher demonstrates energy conservation...Ch. 9 - Consider the kinetic energy of a fly in the cabin...Ch. 9 - When a driver applies brakes to keep a car going...Ch. 9 - What is the theoretical mechanical advantage for...Ch. 9 - Dry-rock geothermal power can be a major...Ch. 9 - A stuntman on a cliff has a PE of 10,000 J. Show...Ch. 9 - Relative to the ground below, how many joules of...Ch. 9 - A hammer falls off a rooftop and strikes the...Ch. 9 - A car can go from 0 to 100 km/h in 10 s. If the...Ch. 9 - If a car traveling at 60 km/h will skid 20 m when...Ch. 9 - Place a small rubber ball on top of a basketball...

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