47. A piece of wood 1 ft square and 10 ft long, weighing 40 Ib per cu. Ft, is submerged vertically in a body of water; its upper end being flushed with the water surface. What vertical force is required to hold it in position? a. 120 Ibs b. 210 Ibs c. 624 Ibs d. 224 Ibs
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- 43. A rectangular object weighs 400 N. It displaces a volume of water that weighs 300 N. a. Draw the figure reflecting the object and the water displaced. b. Calculate the buoyant force using the formula? F, = where: V = volume of the submerged body g = acceleration due to gravityBird bones have air pockets in them to reduce their weight—this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 45.0 g and its apparent mass when submerged is 3.60 g (the bone is water light) a. What mass of water is displaced? b. What is the volume of the bone? c. What is its average density?
- 8. A rock is suspended by a lightweight string. When the rock is in the air, the tension in the string is 39.2 N. When the rock is totally submerged in water, the tension is 28.4 N. When the rock is totally submerged in an unknown liquid, the tension is 21.5 N. What is the density of the unknown liquid?9. A chunk of iron with a mass of 400.0g in air is found to have an apparent mass of 354g when completely submerged in an unknown liquid. (I) What mass of the liquid does the iron displace? (II) What is the density of the fluid? Density of iron = 7.8 g/cm.4. A raft is made of 12 logs lashed together. Each is 30.5 cm in diameter and has a length of 6,00 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 66.0 kg? Do not neglect the weight of the logs. Assume the density of wood is 600 kg/m3 People (whole number) 741 n na741 na
- 3. What fraction of a piece of iron will be submerged when it floats in mercury? 4. A nozzle with a diameter of 0.500 cm is attached to a garden hose with a radius of 0.900 cm where water flows at 1.96 m/s. Calculate the pressure in the hose, given that the absolute pressure in the nozzle is 1.01x10°N/m² and assuming level, frictionless flow.Q1): The mattress of a water bed is 2 m long by 2 m wide and 30 cm deep. A) Find the weight of the water in the mattress. B) Find the pressure exerted by the water on the floor when the bed rests in its normal position. Assume that the entire lower surface of the bed makes contact with the floor. C) What if the water bed is replaced by a 300-lb ordinary bed that is supported by four legs? Each leg has a circular cross section of radius 2 cm. What pressure does this bed exert on the floor?3. Water at a pressure of 4.30 atm at street level flows into an office building at a speed of 0.75 m/s through a pipe 4.60 cm in diameter. The pipes taper down to 1.70 cm in diameter by the top floor, 22.0 m above. Calculate the water pressure in such a pipe on the top floor. Pa
- 5..5. DETAILS 777777.78 Pa MY NOTES A 70.00kg ballroom dancer wearing high heels accidentally steps on her partner's foot. If her entire weight was momentarily supported by the heel of her shoe, which has a surface area of 0.90 cm², what amount of pressure does this apply to her partner's foot? 762.22 Pa 76222.22 Pa 7622222.22 Pa ASK YOUR TEACHER Suppose she instead stepped on her partner's foot with her forefoot instead of her heel (i.e., larger surface area). Would the pressure on her partner's foot be greater, less than, or equal to if she stepped on her partner with her heel? The pressure from the forefoot would be greater than the pressure from her heel. The pressure from the forefoot would be equal to the pressure from her heel. The pressure from the forefoot would be less than the pressure from her heel.7. DETAILS KATZPSEF1 15.P.019. MY NOTES ASK YOUR TEACHER A block of an unknown material floats in water with 13% of it below the surface. What is the density of the material? |kg/m3