What are units, and why arc they important? What arc the base units in the SI sy

Question

What are units, and why arc they important? What arc the base units in the SI system? Name at least two reasons why we would prefer the SI system to the U.S. standard system? Name at least two reasons why the U.S. has not changed over to the SI system? What is a vector? Add the following vectors: What is speed? What is velocity? What arc the units of velocity? What does the sign of the velocity tell us? What is acceleration? What does the sign of acceleration tell us? What are the units of acceleration? Can an object have zero velocity but still have an acceleration? If its possible give a real world example? Describe the motion if: Below is a position vs time graph. How are the two motions the same? How are they different?

Explanation / Answer

1.
units gives a way to quantify dimensions.
units can guide you to the solution of a problem or help to determine whether the solution is correct.

2.
The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived. The SI base units and their physical quantities are: metre for length. kilogram for mass, second for time and so on. These are called base unit

5.
vector is physical quantity which has magnitude as well as direction

7
a)
speed is rate of change of distance. It is a scalar quantity

b)
speed is rate of change of displacement. It is a vector quantity
Its unit is m/s

c)
sign of velocity tell us the direction in which a particle is moving

I am allowed to answer only 1 question at a time. Still I have answered a few more

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.