20 : A needle, 5 cm long can just rest on the surface of water without wetting. Find the weight of needle. Surface tension of water = 0.07 N/m.
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- A collapsible plastic bag (figure below) contains a glucose solution. If the average gauge pressure in the vein is 1.27 x 10 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.04. h = m Glucose solutionA vertical plate is submerged in water (the surface of the water coincides with the x-axis). Find the force exerted by the water on the plate. (The weight density of water is 62.4 lb/ft³.) 24 1 y (ft) -1+ -2+ -3+ -44 x (ft) 279. 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.
- A spherical weather balloon is filled with hydrogen until its radius is 4.10 m. Its total mass including the instruments it carries is 16.0 kg. (a) Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m3. kN (b) What is the net force acting on the balloon and its instruments after the balloon is released from the ground? kN (c) Why does the radius of the balloon tend to increase as it rises to higher altitude? Because the external pressure with increasing altitude.Question 13 An object of mass 4.27 kg is connected to the lower end of a string. When the object is underwater and the tension in the string is 7.09 N. What is the smallest density of a liquid in which the rock will float? (PUHQ1326) a) O1000.00 kg/m3 b) O1810.00 kg/m3 c) O1200.00 kg/m³ d) 03680.00 kg/m³A spherical weather balloon is filled with hydrogen until its radius is 4.30 m. Its total mass including the instruments it carries is 18.0 kg. (a) Find the buoyant force acting on the balloon, assuming the density of air is 1.29 kg/m³. 4.21 kN (b) What is the net force acting on the balloon and its instruments after the balloon is released from the ground? X kN (c) Why does the radius of the balloon tend to increase as it rises to higher altitude? Because the external pressure decreases v with increasing altitude.