Final answer:
We need more specific information about the object's motion, such as angular velocity or acceleration, to determine the number of revolutions it makes in 4 seconds.
Step-by-step explanation:
How many revolutions does the object make during the first 4 s? Without a specific description of the object's acceleration or the nature of its motion, we cannot provide an exact answer to the number of revolutions the object makes in 4 seconds. However, we can refer to the series of related questions and information given to develop a conceptual framework. For example, if a flywheel is rotating at 30 rev/s, we can calculate how many revolutions it makes in a certain time period by simply multiplying the rotational speed by the elapsed time. Still, for the question at hand, unless the acceleration or some aspect of uniform circular motion is provided, such as angular velocity, we cannot determine the number of revolutions. One possible related calculation shown in the reference material is the determination of angular velocity (angular velocity is defined as the change in angle per unit time). Using this definition, if we have the angular velocity and the time, we can calculate the number of revolutions (revolutions per second or rev/s).