Acircular grill of diameter 0.25 m has an emissivity of 0.8. if the surface temperature is maintained at 150°c, determine the required electrical power when the room air and surroundings are at 30°c.

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?