How thick should the air layer (contained within the fur) be so that the bear loses heat at a rate of 50.6 w ? lair = 8.48.4 cm?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

The heliocentric and the geocentric models of the solar system included these central principles