54:28 Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

Krypton is a halogen, so it is a secret element because it is always part of a compound and is difficult to find by itself.
Krypton is a halogen, so it should be kept secret because it is so reactive and toxic.
Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.
Krypton is a noble gas, so it secretly bonds with every type of element without showing it.

Three point charges, two positive and one negative, each having a magnitude of 20 μc are placed at the vertices of an equilateral triangle (30 cm on a side). what is the magnitude of the electrostatic force on the negative charge

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?