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21. Which of the following is not a scalar?

A. Time
B. Energy
C. Pressure
D. Force

Sagot :

GinnyAnsweridn
To determine which of the given options is not a scalar, we need to understand the definitions of scalar and vector quantities.

Scalar Quantities: These have only magnitude and no direction. Examples include time, energy, and pressure.
Vector Quantities: These have both magnitude and direction. An example of this is force.

Let's analyze each option:

1. Time: Time is a scalar quantity because it only has magnitude (e.g., 5 seconds) and no direction.

2. Energy: Energy is also a scalar quantity because it only has magnitude (e.g., 100 Joules) and no direction.

3. Pressure: Pressure is a scalar quantity because it only has magnitude (e.g., 101.3 kPa) and no direction.

4. Force: Force is a vector quantity because it has both magnitude (e.g., 10 Newtons) and direction (e.g., to the right).

Given these definitions:

- Time is a scalar.
- Energy is a scalar.
- Pressure is a scalar.
- Force is not a scalar; it is a vector.

Therefore, the option that is not a scalar is:

(d) Force.
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