Which of the following statements is true of vibrations?
Question 3 options:

A)

Ultrasonic vibrations have a frequency lower than the range for normal hearing.

B)

The frequency of infrasonic vibrations is much too high to be heard by humans.

C)

Infrasonic vibrations are used in sonar equipment and to detect flaws in steel castings.

D)

Neither ultrasonic nor infrasonic vibrations can be heard by humans.

Why there is no inductive reactance in dc circuits

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?