A round duct with diameters 50 cm carries air at a speed of 4 m/s. When the duct constricts to a 20 cm diameter, what is the new air speed? Please answer in m/s

A tall graduated cylinder contains 7 cm of oil (density of 825 kg/m3kg/m3) on top of 20 cm of water (density of 1000 kg/m3kg/m3). The cylinder is open to the air. What is the pressure in the water, 3 cm above the bottom of the cylinder? (in Pa)  1.0323×105  1.0335×105  1.0353×105  1.0294×105  1.0157×105

Diffusion WS Name 2. Methylene chloride is a common ingredient of paint removers. Besides being an irritant, it also may be absorbed through skin. When using this paint remover, protective gloves should be worn. If butyl rubber gloves (0.04 cm thick) are used, what is the diffusive flux of methylene chloride through the glove? Diffusion coefficient in butyl rubber D = 110 x 10-8 cm²/s. Concentrations on the outside and inside surfaces of the glove are C₁ = 0.44 g/cm³, C₂ = 0.02 g/cm³. wing ve the 12

A garden hose has an inner radius of 1.3 cm, is connected to a spray nozzle (radius: 0.5 cm). If this hose is connected to a house capable of  delivering 9 L/s, what is the velocity of the water in the nozzle?

Your fingers hold water in a straw. You insert a straw of length L into aa tall glass of your favorite beverage. You place your finger over the top of the straw so that no air can get in or out., and then lift the straw from the liquid. You find that the straw retains the liquid such that the distance from the bottom of your finger to the top of the liquid is h. Does the air in the space between your finger and the top of the liquid have a pressure P that is (a) greater than, (b) equal to, or (c) less than, the atmospheric pressure P A outside the straw?

57. A room has a volume of 120 m³. An air-conditioning system is to replace the air in this room every twenty minutes, using ducts that have a square cross section. Assuming that air can be treated as an incompress- ible fluid, find the length of a side of the square if the air speed within the ducts is (a) 3.0 m/s and (b) 5.0 m/s.

The 30-cm-long left coronary artery is 4.6 mm in diameter. Blood pressure drops by 3.0 mmHg over this distance.   What is the volume flow rate in L/min through this artery? Express your answer in liters per minute.

A cylindrical container of water has a  13.0-cm  diameter and the water level is 50.0cm from the bottom.  If there is a small  hole at the bottom of the container, with what speed does the water exit the hole? Please give your numerical answer in m/s with two decimal places.

A circular air duct 15.0 cm in radius is used to replenish the air of a room that is 9.20 m by 5.00 m by 4.50 m every 15.0 minutes. How fast does the air flow in the duct? Please show the explanation and equations used.

A Venturi meter is a device for measuring the speed of a fluid within a pipe. The drawing shows a gas flowing at speed v2 through a horizontal section of pipe whose cross-sectional area is A2 = 0.0937 m2. The gas has a density of ρ = 1.30 kg/m3. The Venturi meter has a cross-sectional area of A1 = 0.0234 m2 and has been substituted for a section of the larger pipe. The pressure difference between the two sections is P2 - P1 = 149 Pa. Find (a) the speed v2 of the gas in the larger original pipe and (b) the volume flow rate Q of the gas.   I posted it just now and recieved the wrong answers so i'm asking again. The answers are not A) 1.87 and B) 0.157.