19. Fluid Mechanics

A balsa wood wing has dimensions $27.5\mathrm{cm}$ × $6\mathrm{cm}$ × $0.15\mathrm{cm}$. If the density of balsa wood is $0.16g/{\mathrm{cm}}^3$, what is the mass of the wing?

A 5.0-m-diameter solid aluminum sphere is launched into space. By how much does its diameter increase? Give your answer in μm.

A brass wire is to withstand a tensile force of 350 N without breaking. What minimum diameter must the wire have?

When the weather forecast reports that atmospheric pressure is rising, what is happening to the air density?

Areal density refers to which of the following quantities?

A hollow aluminum sphere with outer diameter 10.0 cm has a mass of 690 g. What is the sphere's inner diameter?

A cylindrical specimen of brass has a diameter of $20 \mathrm{mm}$ and a height of $100 \mathrm{mm}$. If its mass is $0.27 \mathrm{kg}$, what is the density of the brass in $\mathrm{kg}/m^3$?

A 1000 Hz sound wave traveling through 20°C air causes the pressure to oscillate around atmospheric pressure by ±0.050%. What is the maximum speed of an oscillating air molecule? Give your answer in mm/s.

Which of the following statements about air is correct?

On a part-time job, you are asked to bring a cylindrical iron rod of length 85.8 cm and diameter 2.85 cm from a storage room to a machinist. Will you need a cart? (To answer, calculate the weight of the rod.)

How can you use an object's $\mathrm{mass}$ and $\mathrm{volume}$ to predict whether it will sink or float in water?

Which statement is true about the mass and volume of all objects that sink when placed in water?

Two circular rods, one steel and the other copper, are joined end to end. Each rod is 0.750 m long and 1.50 cm in diameter. The combination is subjected to a tensile force with magnitude 4000 N. For each rod, what are (a) the strain and (b) the elongation?

A small circular hole 6.00 mm in diameter is cut in the side of a large water tank, 14.0 m below the water level in the tank. The top of the tank is open to the air. Find (a) the speed of efflux of the water and (b) the volume discharged per second.