The buoyant force on an object is less when the object is
A) only partly submerged.
B) submerged near the surface.
C) submerged near the bottom.
D) none of the above
Answer: A
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A plastic block of dimensions 2.0 cm × 3.0 cm × 4.0 cm has a mass of 30. grams. What is its density?
A) 1.2 g/cm3 B) 1.6 g/cm3 C) 1.3 g/cm3 D) 0.80 g/cm3 E) 2.3 g/cm3
An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59°F (15°C) and the temperature well below the surface is 41°F (5°C)?
a. 3.5% b. 67% c. 31% d. 17% e. 96%
What is the number of moles of H2O produced if you combust 0.5 mole of CH4 according to the following balanced equation?
CH4 + 2 O2 ? CO2 + 2 H2O A) 2 moles B) 4 moles C) 6 moles D) 8 moles E) 1 mole
The resolution of a microscope can be most improved by
A. increasing the wavelength and diameter of the lens. B. decreasing the wavelength and the diameter of the lens. C. decreasing the wavelength and increasing the diameter of the lens. D. increasing the wavelength and decreasing the diameter of the lens.