Which of the following statements about energy is true? i. kinetic energy cannot be transformed into another type of energy. ii. kinetic energy can be transformed into potential energy. iii. potential energy can be transformed into kinetic energy. iv. potential energy cannot be transformed into another type of energy. a. ii and iv only b. ii and iii only c. i and iv only d. i and iii only

B. II and III only

Explanation:

Let’s begin by explianing what energy is: the ability of matter to produce work in the form of movement, light, heat, among others. In this sense, there are several types of energy, but we will talk especifically in this case about kinetic energy and potential energy.

Kinetic energy is the energy an object or body has due to its movement and depends on the mass and velocity of the object or body.

To understande it better: If an object is at rest, its velocity is null and it does not have kinetic energy, however, if the object is moving, then it has kinetic energy.

On the other hand, Potential energy is known as “stored energy” that has the potential to be converted into energy of motion (kinetic energy) or another type of energy (thermal energy, for example). In addition, this energy is related to the work done when a certain force moves an object or body from its natural resting state along a distance to a new position.

So, according to this, Kinetic energy can be transformed into potential energy and Potential energy can be transformed into kinetic energy or any other type of energy. Hence, options II and III are correct.

B. II and III only

Explanation:

Energy can be transformed from one type to another, because there are many different types of energy.

In this case we are talking about kinetic energy and potential energy.

So it is possible that the kinetic energy is converted into potential energy (for example when a ball is thrown upwards, the more it rises it has less kinetic energy but it has more potential energy)

and it is also possible that the potential energy is converted into kinetic energy (if that same ball is dropped from a certain height, when it falls it losses potential energy because it loses height but gains potential energy)

So

II. Kinetic energy can be transformed into potential energy

and

III. Potential energy can be transformed into kinetic energy.

are true.

which is option B. II and III only

gravititional force is a force that is acting around you, it is non-contactable and it is a force that pulls you to the core of the earth.

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia