Physics questions from a quiz about pressure, density, thrust, atmospheric pressure, and greenhouse gases.
Understand the Problem
This appears to be a physics quiz. The questions cover topics such as pressure in fluids, units of pressure, density, thrust, atmospheric pressure, and greenhouse gases. We need to identify each question and determine the best answers.
Answer
vi) c) P1 < P2 vii) c) Nm-1 viii) d) 103kgm-3 ix) c) Equal to the weight of the body x) b) 76 cm of Hg xi) b) OK xii) c) Absorbers
vi) c) P1 < P2 vii) c) Nm-1 viii) d) 103kgm-3 ix) c) Equal to the weight of the body x) b) 76 cm of Hg xi) b) OK xii) c) Absorbers
Answer for screen readers
vi) c) P1 < P2 vii) c) Nm-1 viii) d) 103kgm-3 ix) c) Equal to the weight of the body x) b) 76 cm of Hg xi) b) OK xii) c) Absorbers
More Information
Here's a breakdown of the answers:
- vi) c) P1 < P2: Seawater is denser than river water due to the presence of salt. Since pressure increases with density, the pressure at the same depth will be greater in seawater.
- vii) c) Nm⁻¹: Pressure is force per unit area. N/m^2, Pascal, and Bar are all valid units of pressure.
- viii) d) 103kgm-3: The density of water is approximately 1000 kg/m³, which is equal to 10^3 kg/m³.
- ix) c) Equal to the weight of the body: Thrust is the force exerted perpendicular to a surface. When a body is placed on a surface, the thrust is equal to its weight.
- x) b) 76 cm of Hg: Normal atmospheric pressure is 76 cm of mercury.
- xi) b) 0 K: Absolute zero (0 Kelvin) is the temperature at which all molecular motion stops, and a gas would theoretically have zero pressure and volume.
- xii) c) Absorbers: Greenhouse gases absorb long-wavelength infrared radiation, trapping heat in the atmosphere.
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