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- The drag force F on a boat varies jointly with the wet surface area A of the boat and the square of the speed s of the boat. A boat with a wet surface area of 50ft2 traveling at 7mph experiences a drag force of 98N. Find the wet surface area of a boat traveling 7.5mph and experiencing a drag force of 135N.As discussed a person’s percentage of body fat can be estimated by weighing the person both in air and underwater, from which the average density ρavgcan be calculated. A widely used equation that relates average body density to fat percentage is the Siri equation, , body fat = (495/ρavg) - 450, where ρavg is measured in g/cm3. One person’s weight in air is 947 N while his weight underwater is 44 N. What is his percentage of body fat?What will be the terminal velocity of a rain drop of radius (r) 1mm and mass (M) 0.001g falling through air. The coefficient of viscosity of air (η) is 1.8 X 10-5Ns/m2? Neglect buoyant force. a) 20 m/s b) 29.47 m/s c) 35.8 m/s d) 40 m/s
- A car has a drag coefficient Cd kg.m-3. = 0.30, a frontal area of A= 1.9 m² and a mass 1.2 tonnes. The density of air is 1.2 i) What is the drag force when it is traveling at v = 110 kph in a straight line? Fdrag N. Hint: Retain accurate values until the final calculation, but remember significant figures. Enter answer here= A vehicle travels with a speed of 80 km per h, with a drag coefficient of 0.25. If the cross-sectional area is 6 square meters, then find out the drag force.The frontal surface area of a cyclist has been measured as 0.8 m2. Knowing that the coefficient of air resistance is 0.6 and the density of the air is 1.29 kg/m3, calculate the horizontal force that the cyclist has to apply via the pedals to ride at 40 km/h.
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- After completing your physics class, you are hired to help design a cigar lounge in a nightclub. The ventilation system is critical to this design, as it must circulate all the air in the room every 27 min to filter and purify it, respecting national health regulations. The ventilation ducts you will use have a square cross-section. If the lounge has a volume of 184 m3, and the fans pushing the air give you an airspeed of 3.9 m/s inside the ducts, what must be the minimum length of one side of the square duct? Assume that air can be treated as an incompressible fluid. Give your answer in metresBlood is pumped from the heart at a rate of 5.86 L/min into the aorta (of radius 1.2 cm) determine the speed of blood (in cm/s) through the aorta.Fig. 2-10 If h = 30 in, determine the pressure at A. The liquid has a specific gravity of 2.85. Do not write the unit. You will only input the numerical answer in the space provided. Unit of the Correct Answer: Ib/ft? Decimal Places required in the final answer: 1