A sound whispered at one focus of a whispering gallery can be heard at the other focus. Two people are standing in a whispering gallery whose cross section is a semielliptical arch with a height of 28 feet and a width of 90 feet. How far from the room's center should they stand so that they can whisper back and forth and be heard?

The slope of a good speed time indicates ? a. velocity b. acceleration c. direction d. speed

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

The mini-refrigerator fire was most likely caused by what type of wiring?