An airplane has a mass of 2.1×106 kgkg , and the air flows past the lower surface of the wings at 81 m/sm/s . If the wings have a surface area of 1100 m2m2 , how fast must the air flow over the upper surface of the wing if the plane is to stay in the air? Express your answer to two significant figures and include the appropriate units.

During the summer, the height of the water in a pool decreases by 4.25 inches each week due to evaporation. What is the change in the height of the water over a six-week period?

The atmospheric pressure at the time the video was taken was recorded by the National Weather Service as 30.10 inches of mercury, with the alternative measure of a sea level equivalent 1018.8 bar. What was the atmospheric pressure in the laboratory (we are only a few km from the Weather Service's station) in SI units? The standard unit of pressure is the pascal. For atmospheric pressure it is conventional to use kPa, kilopascal. Why is there a difference between the measured pressure locally and the sea level equivalent, apart from the continued use of imperial units for barometric pressure.

The reservoir in Figure contains water and immiscible oil at a temperature of 20 ° C. What is the height h in centimeters if the density of the oil is 898 kg / m3?

A 5 cubic meter container is filled with 840kg of granite[density is 2400 kg per cubic meter] and the rest of the volume is air[density is 1.15 kg per cubic meter]. From the above statement: Find the mass of air present in the container. * 5.7534 kg 5.3475 kg 5.5374 kg O 5.4375 kg

As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). 1. If the blood speed increases by a factor of 4.00 as it enters the venules, which have a total cross-sectional area 9.5 cm2, what is the total cross-sectional area, in square centimeters, of the capillaries feeding these venules?  A2=(in cm^2) 2. How many capillaries are involved if their average diameter is 7.5 μm? N=

Assuming that each cubic centimeter of water has a mass of exactly 1 g, find the mass of 8.70 cubic meter of water. (b) Suppose that it takes 15.0 hours to drain a container of 39.4 m3 of water. What is the "mass flow rate," of water from the container?

The tidal lung volume of human breathing, representing the amount of air inhaled and exhaled in a normal breath, is 500 cm³. (Assume atmospheric pressure.) (a) What is the number of molecules of air inhaled with each human breath when the air temperature is 25.0°C? molecules (b) If the molar mass of air is 28.96 g/mol, what is the mass (in g) of air molecules inhaled with each breath? (Assume the air temperature is 25.0°C.) g (c) It has been calculated that all of the air in Earth's atmosphere could be collected into a sphere of diameter 1,999 km at a pressure of 1.00 atm. What is the mass (in kg) of the air in Earth's atmosphere? (Assume the density of air used in this calculation was 1.225 kg/m³.) kg (d) If all 7 billion humans on Earth inhaled simultaneously, what percentage of the atmosphere would be inhaled during this process? (Assume the air temperature is 25.0°C everywhere on Earth.) %

A conventional oil barrel (cylindrical in shape) has an internal diameter of 22 inches and a maximum external diameter of 23 inches. The height inside the barrel is 33 inches, with a maximum external height of of 34 inches. if only 92% of the volume of the barrel can be filled, what is this volume in liters?

What mass of silver has a volume of 150 cm3?   A certain gas has a volume of 600 cm3.  What is its volume when the pressure is tripled?   Consider the gas in # 5 above.  What is its volume if the pressure is changed to one-third its original value?