9. Assuming an air density of 1.21 kg/m^3, determine how many kilograms of air occupy a classroom that has a 100 square meter floor area and a 4 meter high ceiling. b). What is the weight of the air in the room in Newtons (N)? c) What is the weight of the air in pounds (lbs.) Your answer

(a) A rectangular gasoline tank can hold 50.0 kg of gasoline when full. What is the depth of the tank if it is 0.500-m wide by 0.900-m long? (b) Discuss whether this gas tank has a reasonable volume for a passenger car.

A large tanker truck can carry 20 tons (40.000 lb) of liquid (a) What volume of water can it carry? (b) What volume of gasoline can it carry?

The density of air is 1.3 kg/m3 at sea level. From your knowledge of air pressure at ground level, estimate the height of the atmosphere. As a simplifying assumption, take the atmosphere to be of uniform density up to some height, after which the density rapidly falls to zero. (In reality, the density of the atmosphere decreases as we go up.) (This question is courtesy or Edward F. Redish. For more questions of this type, see http://www.physics.umd.edu/perg/.)

. The volume of the Drop Tower "Bremen" (a 100-meter-tall tube used to study processes during free fall) is l,700 m3. (a) What is the mass of the air that must he removed from it to reduce the pressure inside to nearly zero (1 Pa compared to 100,000 Pa)? (b) What is the weight of the air in pounds?

The average human has a density of 945 kg/m3 after in haling and 1 020 kg/m3 after exhaling. (a) Without making any swimming movements, what percentage of the human body would be above the surface in the Dead Sea (a body of water with a density of about 1 230 kg/m3) in each of these cases? (b) Given that bone and muscle are denser than fat, what physical characteristics differentiate sinkers (those who tend to sink in water) from floaters (those who readily float)?

Dry air is primarily composed of nitrogen. In a classroom demonstration, a physics instructor pours 2.00 L of liquid nitrogen into a beaker. After the nitrogen evaporates, how much volume does it occupy if its density is equal to that of the dry air at sea level? Liquid nitrogen has a density of 808 kg/m3.

Mercury is commonly supplied in flasks containing 34.5 kg (about 76 Ib.). What is the volume in liters of this much mercury?

A 75.0-kg floats in freshwater 3.00% of his volume above water when his are empty, and 5.00% of his volume above water when his lungs are full. Calculate the volume of air inhales—called his lung capacity—in liters. (b) Does lung volume seem reasonable?

Bird bones have air pockets to reduce their weight—this also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone air and in water and finds its mass is 45.0 g ad its apparent mass when submerged is 3.60 g (assume the bone is watertight.)(a) What mass of is displaced? (b) What is the volume of the bone? (c) What is its average density?