Two tuning forks oscillate with the same amplitude, but one has twice the frequency. Which (if either) produces the more intense sound?

A space probe enters the thin atmosphere of a planet where the speed of sound is only about $55 \mathrm{~m} / \mathrm{s}$. What is the probe's Mach number if its initial speed is $15,000 \mathrm{~km} / \mathrm{h}$ ?

Show that the angle $\theta$ a sonic boom makes with the path of a supersonic object is given by the said equation.

A meteorite traveling $9400 \mathrm{~m} / \mathrm{s}$ strikes the ocean. Determine the shock wave angle it produces in the water just after entering. Assume $T=20^{\circ} \mathrm{C}$.

A supersonic jet traveling at Mach 2.2 at an altitude of 9500 m passes directly over an observer on the ground. Where will the plane be relative to the observer when the latter hears the sonic boom?

(II) You look directly overhead and see a plane exactly 1.25 km above the ground flying faster than the speed of sound. By the time you hear the sonic boom, the plane has traveled a horizontal distance of 2.0 km. Determine the speed of the plane (the Mach number). Assume the speed of sound is 330 m/s.

A meteorite traveling $9400 \mathrm{~m} / \mathrm{s}$ strikes the ocean. Determine the shock wave angle it produces in the air just before entering the ocean. Assume $T=20^{\circ} \mathrm{C}$.

(II) You look directly overhead and see a plane exactly 1.25 km above the ground flying faster than the speed of sound. By the time you hear the sonic boom, the plane has traveled a horizontal distance of 2.0 km. Determine the angle of the shock cone, $\theta$.

The wake of a speedboat is $12^{\circ}$ in a lake where the speed of water waves is $2.2 \mathrm{~km} / \mathrm{h}$. What is the speed of the boat? The wake is the full width, $2 \theta$ in Fig. 16-24.

A high-flying jet cruising at $3000 \mathrm{~km} / \mathrm{h}$ displays a Mach number of $3.1$ on a screen. What is the speed of sound at that altitude?

A meteorite traveling $8800 \mathrm{~m} / \mathrm{s}$ strikes the ocean. Determine the shock wave angle it produces $(b)$ in the water just after entering. Assume $T=20^{\circ} \mathrm{C}$.

How fast is an object moving on land if its speed at $24^{\circ} \mathrm{C}$ is Mach $0.33$ ?

A meteorite traveling $8800 \mathrm{~m} / \mathrm{s}$ strikes the ocean. Determine the shock wave angle it produces $(a)$ in the air just before entering the ocean. Assume $T=20^{\circ} \mathrm{C}$.

A factory whistle emits sound of frequency $770 \mathrm{~Hz}$. The wind velocity is $15.0 \mathrm{~m} / \mathrm{s}$ from the north (heading south). What frequency will observers hear who are located, at rest. What frequency is heard by a cyclist heading west, toward the whistle at $12.0 \mathrm{~m} / \mathrm{s}$ ? Assume $T=20^{\circ} \mathrm{C}$.