A 31.4 kg boy stands on a horizontal surface. HINT (a) What is the volume of the boy's body (in m) if his average density is 981 kg/m? (b) What average pressure (in Pa) from his weight is exerted on the horizontal surface if his two feet have a combined area of 1.70 x 10 m' Pa

Suppose you have a 8.8 cm diameter fire hose with a 3.6 cm diameter nozzle. a) Calculate the pressure drop due to the Bernoulli effect as water enters the nozzle from the hose at the rate of 40.0 L/s. Take 1.00 × 103 kg/m3 for the density of the water. b) To what maximum height, in meters, above the nozzle can this water rise? (The actual height will be significantly smaller due to air resistance.

A volunteer weighing 750 N sits on a bed of 150 closely spaced nails. Each nail has a cross-sectional area of 0.00025 m2. Assuming that the volunteer occupies the entire space of 1nail?, how much pressure does the nail exert on him?

A small jet airplane has a total wing area of 90.0 m2 and a mass of 8.88 104 kg (a) If this jet is in horizontal flight, determine the pressure difference between the lower and upper surfaces of the wings. (b) When the speed of air traveling over the wing is 227 m/s, determine the speed of air under the wing. Use 1.29 kg/m3 as the density of air. (c) Why do all aircraft have a maximum operational altitude?

Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area (in cm2) of the tires in contact with the ground. The bicycle plus rider has a mass of 75.0 kg, and the gauge pressure in the tires is 3.45 ✕ 105 Pa.