Materials with the same r-value have the same ability to insulate.
a. true
b. false

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Convection occurs when thermal energy is transferred by the movement of

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?