Answer:
810.37 m/s
Explanation:
s = Displacement = 5 m
= Speed of sound in air = 343 m/s
Time taken to travel the distance
Time for the sound in metal
Speed of sound is given by
The speed of sound in the metal is 810.37 m/s
D. Kinetic energy to electrical energy
For this we want to use Boyle's Law. Boyle’s law states that the pressure and volume of a fixed quantity of a gas are inversely proportional under constant temperature conditions. The formula for this is P1V1 = P2V2. We want to solve this out so it equals V2 (Volume 2). So P1V1 / P2 = V2. Then plug in your values for the variables. So (101)(4.2) / 235 = V2; so 424.2 / 235 = V2. The final volume equals 1.81. I hope this helps, If not I am very sorry.
Iron nail. the rest of those are not iron or some form of magnetic material.
Answer:
Period of brightness variation and luminosity.
Explanation:
The Cepheid variables are used as distance indicators. This requires estimation of periods and (usually) intensity-mean magnitudes in order to establish a period—apparent luminosity relation. It is particularly important for the techniques employed to be as accurate and efficient as possible.
