Afire truck with sirens on, is driving north on a street. a car is driving south on the same street and sees the fire truck ahead. the car is moving at a speed of 15.7 m/s and the fire truck is moving at a speed of 31.8 m/s. the siren of the fire truck produces a 965 hz sound. the speed of sound in air is 343 m/s. what frequency does the person in the car hear? if the sound from the siren is produced at 45.2 w, what is the reading on the decibel meter held by the person when the car is 36.8 m away from the fire truck? assume the sound from the horn is emitted uniformly in all directions (a = 4 pi r^2). what is the farthest distance from the fire truck that a person could hear the siren?

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present