Uploads from Little Saigon #Wack

Currently Playing: Fluid Dynamics MCQ_1

Two substances mercury with a density 13600 kg/m3 and alcohol with density 800 kg/m3 are selected for an experiment. If the experiment requires equal masses of each liquid, what is the ratio of alcohol volume to the mercury volume (𝑉_𝑎𝑙𝑐𝑜ℎ𝑜𝑙/𝑉_𝑚𝑒𝑟𝑐𝑢𝑟𝑦 )? There are two round tables in the physics classroom: one with a radius of 50 cm and the other with a radius of 150 cm. What is the relationship between the two forces applied on the tabletops by the atmospheric pressure? A) 𝐹_1/𝐹_2 =1/3 B) 𝐹_1/𝐹_2 =1/9 C) 𝐹_1/𝐹_2 =3/1 D) 𝐹_1/𝐹_2 =9/1 E) 𝐹_1/𝐹_2 =1/6 A horizontal pipe carries water (𝜌_𝑤𝑎𝑡𝑒𝑟=1000 𝑘𝑔/𝑚^3) at a flow rate of 0.02 m3/s. At a wide section of the pipe, the cross-sectional area is 0.05 m2. The pipe narrows to an area of 0.01 m2. Assume the flow is ideal, which of the following is most nearly the pressure difference between the wide and narrow sections of the pipe? 1.6 Pa 480 Pa 620 Pa 950 Pa 1900 Pa