ML-1 T-2 is the dimension of_______________?
Correct answer: B. Pressure
- A. Force
- B. Pressure
- C. Momentum
- D. Energy
Explanation
Pressure is force per unit area, so its dimensions are (MLT^-2)/L² = ML^-1T^-2. Students may choose a because force has dimensions MLT^-2, but pressure includes division by area.
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About Fluid Drag
Fluid drag is the resistive force exerted by a liquid or gas on an object moving through it, and its value depends on speed, fluid density, shape and exposed area. Questions examine drag at low and high speeds, terminal velocity when drag balances weight, and the difference between drag and ordinary solid friction.
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