Question detail
Pressure and pressure differences in fluids (physics only) scenario: a gear changes turning effect and rotation speed. Which answer best addresses Pressure in liquids (physics only) and the objective to (Physics only) Identify density in kilograms per metre cubed and depth in metres when using p = hρg?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Pressure and pressure differences in fluids (physics only)
Question
- A. In the gear system scenario, apply depth to (Physics only) Identify density in kilograms per metre cubed and depth in metres when using p = hρg while keeping force versus pressure separate.
- B. In the gear system scenario, mix up force versus pressure and ignore depth.
- C. Use a general revision statement without applying Pressure in liquids (physics only) to the situation.
- D. Choose a different forces topic instead of explaining (Physics only) Identify density in kilograms per metre cubed and depth in metres when using p = hρg.
Answer
The correct answer is: In the gear system scenario, apply depth to (Physics only) Identify density in kilograms per metre cubed and depth in metres when using p = hρg while keeping force versus pressure separate.
Explanation
The correct option is In the gear system scenario, apply depth to (Physics only) Identify density in kilograms per metre cubed and depth in metres when using p = hρg while keeping force versus pressure separate.. It is correct because the scenario says a gear changes turning effect and rotation speed, which must be interpreted through Pressure in liquids (physics only). This directly supports the learning objective to (Physics only) Identify density in kilograms per metre cubed and depth in metres when using p = hρg. Use values 7, 13, and 12 only if the question asks for a calculation. The answer earns credit by naming the relevant force or motion quantity, using units when needed, and avoiding the boundary error force versus pressure.
Common mistake
Common Mistake in Density and Depth Identification
Students often confuse the units for density and depth when using the equation p = hρg, mistakenly using grams per cubic meter for density or centimeters for depth.
Always remember that density should be in kilograms per cubic meter (kg/m³) and depth in meters (m) when applying the equation p = hρg.
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