Which of the following is an inertial reference frame? check all that apply. check all that apply. a reference frame that is moving downward at a constant speed a reference frame that is motionless a reference frame that is moving upward at a constant speed a reference frame that is rotating at a constant speed?

Inertial reference frames

a reference frame that is moving downward at a constant speed

a reference frame that is motionless

a reference frame that is moving upward at a constant speed

Explanation:

An inertial frame of reference is a frame of reference in which the Newton's laws are valid. The frame in which the objects have the property of inertia is called an inertial frame. In this frame the objects do not accelerate without external force. All frames of reference moving with constant velocity or at rest relative to an inertial frame of reference are also inertial frames of reference

In a non-inertial frame of reference, the Newton's laws will not work. They are moving with an acceleration.

So in the given option the first three are fitting with the definition for the inertial frame of reference.

But the Fourth is not an inertial frame. Because it is changing direction when rotating.

Velocity is the speed with direction. When the direction changes the velocity also changes (even if the speed is constant).

Inertia reference frames are:

A Reference frame that is moving upward at a constant speed

B reference frame that is moving downward at a constant speed

C reference frame that is motionless

This also implies the correct answer is a, b, and c.

A frame of reference refers to a coordinate system that is attached or connected to a rigid body.

For instance, if a body is in motion with a constant speed, the frame is referred to as an Inertial frame. In an initial frame, the application of Newton’s law can determine the dynamics of every particle.

Also, the frame will be non-inertia if the body where the imagined frame is attached is accelerating. In a non-inertia frame, newton’s law would not be applicable because the body is moving with acceleration.

Simply put, any frames of reference that move with a constant speed or velocity are called inertial frames. Therefore, from the answer’s choice provided, option a, b, and c, all fits the definition of an inertial frame of reference.

However, option d does not represent inertial frame because the frame rotates at a constant velocity.

Thus, inertial reference frames are: Reference frame that is moving upward at a constant speed, reference frame that is moving downward at a constant speed and reference frame that is motionless

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The cell theory  

Explanation:

The modern cell theory states that 1-all living things are composed of cells, 2-all cells derive from pre-existing cells by cellular division, and 3-the cell is the structural and functional unit of all life forms. Many researchers contributed to the development and formulation of the modern cell theory. First, the invention of the optical microscope, followed by the improvement with lighting by Robert Hooke (1660) and observation of microscopic organisms by Antonie van Leeuwenhoek (1675) contributed to the observation of cellular structures that previously were unknown. Subsequently, the cell theory was proposed by Schleiden and Schwann (1839) who suggested that all life forms are composed of cells (the fundamental unit of life). Subsequently, the theory was expanded by Virchow (1855) who proposed that all cells arise from pre-existing cells. Thus, the modern cell theory is the result of the scientific work of many researchers that have contributed across centuries in order to collect a body of knowledge (both experimental and observational) that supports the statements resumed in this theory. Nowadays, it is impossible to conceive biology as a scientific discipline without making reference to the modern cell theory.