Chapter 11: Q2CQ (page 394)
Which of the following substances are fluids at room temperature: air, mercury, water, glass?
Fluids are substances which undergoes continuous deformation when subjected to a shearing force.
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You can chew through very tough objects with your incisors because they exert a large force on the small area of a pointed tooth. What pressure in Pascal can you create by exerting a force of \[{\rm{500 N}}\] with your tooth on an area of \[{\rm{1}}{\rm{.00 m}}{{\rm{m}}^{\rm{2}}}\]?
A certain man has a mass of 80 kg and a density of(excluding the air in his lungs). (a) Calculate his volume. (b) Find the buoyant force air exerts on him. (c) What is the ratio of the buoyant force to his weight?
Marbles dropped into a partially filled bathtub sink to the bottom. Part of their weight is supported by buoyant force, yet the downward force on the bottom of the tub increases by exactly the weight of the marbles. Explain why.
Why is it difficult to swim under water in the Great Salt Lake?
A full-term fetus typically has a mass of\[{\rm{3}}{\rm{.50 kg}}\]. (a) What pressure does the weight of such a foetus create if it rests on the mother’s bladder, supported on an area of\[{\rm{90}}{\rm{.0 c}}{{\rm{m}}^{\rm{2}}}\]? (b) Convert this pressure to millimetres of mercury and determine if it alone is great enough to trigger the micturition reflex (it will add to any pressure already existing in the bladder).
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