You are driving west in your car on a clear, warm day. up ahead, you see a dark band of ominous clouds. soon, you drive beneath the towering bank of clouds, and things get very dark. for twenty minutes, you are pelted with rain and even some hail. you keep driving west, even though it seems a little sketchy at times. on the radio, you hear that the next county to the north is under a tornado warning. then the sky lightens, and there is only a little rain. you notice that the temperature outside has dropped by 15°f (8°c). what have you just driven across?

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This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j. b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.