george walks to a friends house he walks 750 meters north then realizes he walked too far. he turns around and walks 250 meters south. the entire walk takes him 13 seconds what is his speed per second

Which notation is used to represent an alpha particle? a. b. c. d.

Aheat engine that operates on a carnot cycle has an efficiency of 0.420 when its low-temperature reservoir is at 10 ∘c.part aby how many degrees celsius must you increase the temperature of the high-temperature reservoir to increase the efficiency to 0.600 if you continue to use the same low-temperature reservoir?

Aflute player hears four beats per second when she compares her note to a 523 hz tuning fork (the note c). she can match the frequency of the tuning fork by pulling out the “tuning join” to lengthen her flute slightly. what was her initial frequency?