Which of these is NOT an example of work? A. Holding a heavy book
B. Pushing a wheelbarrow
C. Lifting weights

Answers

Answer 1

Answer: The correct answer is A. Holding a heavy book.

In this case, there is not a displacement of the system and you must remember that work is force times displacement.

Answer 2

Answer: the correct answer is actually A

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Describe a process in which energy changes forms at least twice. Are there any unwanted forms of energy that are produced during the energy transformations?

Answers

Explanation:

Consider the example of the electric fan. The electrical energy used in the electric fan is greater than the kinetic energy of the moving fan blades.

According to the law of conservation of the energy, the energy is neither created nor destroyed. It always remains same.

The electrical energy used in the electric fan is also used in the producing unwanted sound energy.

The electrical energy in the electric fan is converted into any unwanted forms of energy. Like in producing unwanted sound energy and the heat energy. If the electric fan shakes then some of the electric energy is converted into unwanted kinetic energy.

Here, the electrical energy changes into sound energy, heat energy and kinetic energy.

A newspaper turns yellow in sunlight. Is this a physical or chemical change?

Answers

It is a chemical change. I always think of a chemical/physical change as if you could reverse it back as it started off, for example if you stepped on a can you can reverse the can back probably not exactly like it was before but you can still reverse it so this would be a physical change, and if you baked a pizza you could not reverse the dough and everything else back.

How is amplitude related to loudness

Answers

The loudness of a sound is linked to the size of the vibration which produces it. A big vibration makes a louder sound. Scientists use the word 'amplitude' for the size of waves. For waves on water, it is easy to measure the amplitude.

A stuntman jumps from the roof of a building to the safety net below. How far has the stuntman fallen after 2.3 seconds? A. 25.9 m B. 21.2 m C. 9.8 m D. 11.3 m

Answers

Answer:

answer should be 25.9

Explanation:

Answer:

25.9 m

Explanation:

What are six forms of energy

Answers

1.Sound Energy- is produced when an object is made to vibrate. Sound energy travels out as waves in all directions. Sound needs a medium to travel through, such as air, water, wood, and even metal!
Examples: Voices, whistles, horns and musical instruments.

2.Chemical Energy - is really a form of potential energy and is the energy stored in food, gasoline or chemical combinations.
Examples: Striking a match, combining vinegar and baking soda to form CO2 Gas, breaking light sticks releases chemical energy.

3.Radiant Energy - is a combination of heat and light energy. Light energy, like sound energy, travels out in all directions in waves.
Examples: A light bulb, the glowing coils on a toaster, the sun, and even headlights on cars.

4.Mechanical Energy - is moving energy. It is the form that we most see around us. All moving objects produce mechanical energy. The movements within machines is also mechanical energy.
Examples: People, a rolling bicycle, moving gears, and running cars.

5.Atomic Energy - is produced when you split atoms. A tremendous amount of energy is released when this happens.
Examples:Atomic bombs, nuclear power plants, nuclear submarines, and the sun.

6.Electrical Energy - Energy produced by electrons moving through a substance is known as electrical energy. We mostly see electric energy in batteries and from the outlets in our homes. Electrical energy lights our homes, run motors, and makers our TVs and radios work.
Examples: CD players, TVs and Video games.

Final answer:

The six forms of energy are chemical, thermal, nuclear, electrical, mechanical, and light energy. Each has different characteristics and uses, such as chemical energy being stored in potential changes or light energy being visible to the human eye.

Explanation:

Energy exists in many forms. Here are six common forms of energy:

Chemical Energy: It is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform into other substances.
Thermal Energy: It is the internal energy present in a system due to its temperature.
Nuclear Energy: The energy in the nucleus of an atom. It can be obtained through two methods, namely fission (splitting of atoms) and fusion (joining of atoms).
Electrical Energy: Form of energy caused by the movement of electrons.
Mechanical Energy: It's a sum of potential and kinetic energy. It is associated with the motion and position of an object.
Light Energy: It is a form of energy that is visible to the human eye.