What is the velocity of a wave that has a frequency of 2,500 Hz and a wavelength of 2.5 meters? 1,225 m/s
5,000 m/s
500 m/s
50 m/s

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87