Cupid fires an arrow that strikes St. Valentine, producing the usual sounds of harp music and bird chirping as
Valentine swoons into a fog of love. If Cupid hears this
telltale sound exactly one second after firing the arrow and
the average speed of the arrow is 40 m/sec, what was the
distance separating them? Take 340 m/sec for the speed of
sound

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?

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles