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3 years ago

Which two statements are true about energy transformations?

2 answers:

7 0

This is very basic physics theory.
Energy is never created nor destroyed.

This can be counter intuitive if you are studying nuclear physics since Einstein told us E=mc^2. Energy coming from just mass? This is the reason why the (really small) percentage of the universe we know, which isn't dark matter or dark energy, is generally called energy and matter.

Alona [7]3 years ago

6 0

Answer: Statements which are true are as follows.

Energy is never created.

Energy is never destroyed.

Explanation:

According to the law of conservation of energy, energy can neither be created nor it can be destroyed. It can only be transformed from one form to another.

For example, a ball at rest will have potential energy but the moment this ball comes into motion then its potential energy will convert into kinetic energy.

Thus, we can conclude that following two statements are true about energy transformations.

Energy is never created.

Energy is never destroyed.

You might be interested in

A uniform rod rotates in a horizontal plane about a vertical axis through one end. The rod is 3.46 m long, weighs 12.8 N, and ro

Mkey [24]

Answer:

a. Rotational inertia: 5.21kgm²

b. Magnitude of it's angular momentum: 123.32kgm²/s

Explanation:

Length of the rod = 3.46m

Weight of the rod = 12.8 N

Angular velocity of the rod= 226 rev/min

a. Rotational Inertia (I) about its axis

The formula for rotational inertia =

I = (1/12×m×L²) + m × ( L ÷ 2)²

Where L = length of the rod

m = mass of the rod

Mass of the rod is calculated by dividing the weight of the rod with the acceleration due to gravity.

Acceleration due to gravity = 9.81m/s²

Mass of the rod = 12.8N/ 9.81m/s²

Mass of the rod = 1.305kg

Rotational Inertia =

(1/12× 1.305 × 3.46²)+ 1.305 ( 3.46÷2)²

Rotational Inertia = 1.3019115 + 3.9057345

Rotational Inertia = 5.207646kgm²

Approximately = 5.21kgm²

b. The magnitude of the rod's angular momentum about the rotational axis is calculated as

Rotational Inertia about its axis × angular speed of the rod.

Angular speed of the rod is calculated as= (Angular velocity of the rod × 2π)/60

= (226×2π) /60

= 23.67 rad/s

Rotational Inertia = 5.21kgm²

The magnitude of the rod's angular momentum about the rotational axis

= 5.21kgm²× 23.67 rad/s

= 123.3207kgm²/s

Approximately = 123.32kgm²/s

7 0

4 years ago

As water heats in a pot on a stove, it might produce some mist above its surface right before the water begins to roll. What is

mr_godi [17]

When a liquid is heated, the molecules gain kinetic energy. As the liquid begins to boil they have enough energy to break the intermolecular attractions between their neighbors. This happens first at the surface before the volume below has enough energy to boil. Thus you see high energy water molecules escaping from the surface as mist.

4 0

4 years ago

Read 2 more answers

What is the difference between a unit and a variable?

scoundrel [369]

Answer:

A case is an experimental unit. ... Another synonym is experimental unit. A variable is a characteristic that is measured and can take on different values. In other words, something that varies between cases.

Explanation:

7 0

3 years ago

Read 2 more answers

Imagine a third particle, which we will call a cyberon. It has three times the mass of an electron (3m). It has a positive charg

GalinKa [24]

Answer:

Explanation:

Let the potential difference between plate be V .

Electrical energy lost for cyberon = V x 3e

Kinetic energy lost by cyberon = kinetic energy gain by it

V x 3e = 1/2 x 3m x vc²

For electron , the above equation becomes

V x e = 1/2 x m x ve²

Dividing the two equations

1 = vc² / ve²

vc = ve .

vc / ve = 1 .

6 0

3 years ago

In the article, what is the result of the conflict between the American public and the U.S. Food and Drug Administration (FDA)?

user100 [1]

Food and drug administration (FDA) is used for protecting the public health in safety, security, drugs, biological products, and medicinal devices.

Explanation:

The U.S food and Drug Act tells about the sale of misbranded or adulterated food and drugs in interstate commerce and had a foundation for the nation's first consumer protection agency.

The federal law is passed to establish the quality standards for foods, drugs and medical devices manufactured and sold in U.S.

This act has a new consumer protection against unlawful cosmetics and medical devices and enhances the government's ability to enforce the law. The main goal of FDA is to make food and drug safe for public consumption.

4 0

3 years ago