True/False
3)The position-time graph of an object moving with a constant average velocity is always a straight line.
True
4)A time interval is a scalar quantity.
True
True, although some people may argue that a time interval can be considered a vector quantity if it has both magnitude and direction, like time spent going forward or backward in time. But for the purposes of most basic physics concepts, it is generally considered a scalar quantity. Just don't confuse it with a banana, because that would be quite a slip up!
To answer questions like these, you need to have a basic understanding of the concepts and definitions involved. Here's how you can arrive at the correct answers:
3) To determine whether the position-time graph of an object moving with a constant average velocity is always a straight line, you need to recall the definition of average velocity. Average velocity is defined as the displacement of an object divided by the time taken. If an object is moving with a constant average velocity, it means that its displacement is changing at a constant rate over time. This implies that the position-time graph will be a straight line, as the object's position is changing uniformly with time. Therefore, the statement is true.
4) When determining whether a time interval is a scalar quantity, you need to understand the properties of scalar and vector quantities. Scalar quantities are those that have magnitude only, while vector quantities have both magnitude and direction. Time interval refers to the difference between two points in time, and it does not possess a direction associated with it. Therefore, a time interval is a scalar quantity. Hence, the statement is true.
Remember, to confidently answer questions, it's crucial to understand the definitions and concepts related to the subject matter.