Which would describe a situation in which the doppler effect is occurring? sheila notices an increase in volume as an object approaches her. brad hears an object increase in loudness as it is vibrated at its natural frequency. judy notices an increase in intensity as an object is vibrated at its natural frequency. damian hears a change in pitch as an object moves past him.?

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

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.

Objects a and b are visible in the night sky. six months later they are still visible, but object b shows less parallax than object a. which object is closer? a. a b. b c. you would need to wait another six months in order to figure this out. d. you would need to know the objects' angular diameters in order to figure this out.