Why do scientists use models? A. To collect and record data through the scientific method B. To explain difficult concepts and show how things work C. To make conclusions based on experiments D. To observe small objects and make them look larger

The most correct option here is B

Explanation:

Models are usually used in science in order to proffer or explain difficult concepts of the real/actual "subject". The model to be used must have some level of similarity (usually high) with the actual subject. The use of model helps to explain how certain things work in the actual subject. Actual subjects are sometimes eventually used later after convincing experiments (showing "positive" results) must have been done on the model.

From the explanation above, it can be deduced that the correct option is B

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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