1. What is the velocity of sound in the air?
At the temperature of 33° the mean velocity of sound is 1100 feet in a second. It is increased or diminished half a foot for each degree of temperature above or below 33°.
2. How can the distance of an object be ascertained by the report of fire-arms?
By observing the number of seconds that elapse between the flash and the report of a gun, and multiplying the number by the velocity of sound in the air.
3. What is momentum?
The force possessed by a body in motion; and is measured by the product of the mass of the body into its velocity.
4. When equal masses are in motion, what proportion do their momenta bear to their velocities?
They are proportional to their velocities.
5. When velocities are equal, what proportion do their momenta bear to their masses?
They are proportional to their masses.