Hey, good to see you again. 2. The power required to keep the aircraft moving with constant velocity is given by: Step 1: Recall the formula for power ($P$) when a force ($F$) is applied to move an object at a constant velocity ($v$). $$P = F \cdot v$$ Step 2: Substitute the given expression for the resistive force, $F = Kv^2$, into the power formula. $$P = (Kv^2) \cdot v$$ Step 3: Simplify the expression. $$P = Kv^{2+1}$$ $$P = Kv^3$$ The correct option is D. $$\boxed{\text{D}}$$ 3. Metals have positive temperature coefficients of resistance. This means that their: A positive temperature coefficient of resistance indicates that the resistance of the material increases as its temperature increases. The correct option is B. $$\boxed{\text{B}}$$ 4. The Kelvin temperature scale differs from other temperature scales in that it: The Kelvin scale is an absolute thermodynamic temperature scale. Its definition is based on fundamental physical constants and does not rely on the properties of any specific substance (like the freezing/boiling points of water for Celsius or Fahrenheit). The correct option is A. $$\boxed{\text{A}}$$ 5. Which of the following set of physical quantities are all vectors? A vector quantity has both magnitude and direction. A scalar quantity has only magnitude. Mass: Scalar Velocity: Vector Displacement: Vector Magnetic flux: Scalar Momentum: Vector Electric field strength: Vector Magnetic flux density: Vector Force: Vector Let's check the options: A: Mass (scalar), velocity (vector), displacement (vector). Not all vectors. B: Magnetic flux (scalar), displacement (vector), momentum (vector). Not all vectors. C: Magnetic flux (scalar), electric field strength (vector), velocity (vector). Not all vectors. D: Magnetic flux density (vector), force (vector), momentum (vector). All are vectors. The correct option is D. $$\boxed{\text{D}}$$ Send me the next one 📸